[PATCH openEuler-25.03 0/1] NUMA ro-data replication for userspace applications
This patchset implements support of userspace translation tables and private read-only data replication for AArch64 and is going to improve latency and memory bandwidth by reducing cross-NUMA memory accesses. openEuler 25.03 is used as a baseline. Current implementation supports next functionality: 1. Per-NUMA node replication of userspace translation tables and private read-only data. We replicate only __private read-only__ data to avoid dealing with replicas coherence and consistency support. Translation tables, in turn, are able to be replicated for any kind of underlying data. 2. Ability to enable userspace replication for a certain process via procfs or for a group of processes via memory cgroup. 3. 4K and 64K pages are supported. 4. Replicated data pages can't be a ksm, migration or swap/reclaim candidates by design. But for other pages these work as well with replicated translation tables support. Once the user replication was enabled for a process via either procfs or memory cgroup, all it's existing private read-only data will be immediately replicated with translation tables for them. Later, as the process running, __any__ page fault occured will cause replicating of translation tables related to the faulted address. Also there is a mechanism implemented on the top of numa-balancer that will replicate private read-only pages on NUMA faults, as the process running (numa balancer should be enabled for the mechanism to work). Known problems: 1. Current implementation doesn't support huge pages, so you have to build the kernel with huge pages disabled for user replication to work. Huge pages support will be added in the nearest future. 2. mremap syscall doesn't work with replicated memory yet. 3. page_idle, uprobes and userfaultfd support replicated translation tables, but not replicated data. Be responsible using these features with userspace replication enabled. 4. When replicating translation tables during page faults, there should be enough space on __each__ NUMA node for table allocations. Otherwise it will cause OOM-killer. Despite the problems above, they are mostly not related to workloads assumed to benefit from user replication feature, and such workloads will work properly with the feature enabled. Nikita Panov (1): mm: Support NUMA-aware replication of read-only data and translation tables of user space applications arch/arm64/include/asm/numa_replication.h | 3 + arch/arm64/mm/init.c | 2 +- arch/arm64/mm/pgd.c | 13 +- fs/exec.c | 18 + fs/proc/base.c | 76 + fs/proc/task_mmu.c | 111 +- include/asm-generic/pgalloc.h | 19 +- include/asm-generic/tlb.h | 22 + include/linux/cgroup.h | 1 + include/linux/gfp_types.h | 12 +- include/linux/memcontrol.h | 4 + include/linux/mm.h | 75 +- include/linux/mm_inline.h | 2 +- include/linux/mm_types.h | 49 +- include/linux/numa_kernel_replication.h | 185 ++- include/linux/numa_user_replication.h | 738 ++++++++++ include/linux/page-flags.h | 18 +- include/trace/events/mmflags.h | 10 +- include/uapi/asm-generic/mman-common.h | 2 + kernel/cgroup/cgroup.c | 2 +- kernel/events/uprobes.c | 5 +- kernel/fork.c | 41 + kernel/sched/fair.c | 8 +- mm/Kconfig | 13 + mm/Makefile | 1 + mm/gup.c | 3 +- mm/ksm.c | 15 +- mm/madvise.c | 18 +- mm/memcontrol.c | 137 +- mm/memory.c | 544 +++++-- mm/mempolicy.c | 5 + mm/migrate.c | 11 +- mm/migrate_device.c | 17 +- mm/mlock.c | 31 + mm/mmap.c | 32 + mm/mmu_gather.c | 55 +- mm/mprotect.c | 409 +++--- mm/mremap.c | 97 +- mm/numa_kernel_replication.c | 4 +- mm/numa_user_replication.c | 1577 +++++++++++++++++++++ mm/page_alloc.c | 8 +- mm/page_idle.c | 3 +- mm/page_vma_mapped.c | 3 +- mm/rmap.c | 41 +- mm/swap.c | 7 +- mm/swapfile.c | 3 +- mm/userfaultfd.c | 7 +- mm/userswap.c | 11 +- 48 files changed, 4049 insertions(+), 419 deletions(-) create mode 100644 include/linux/numa_user_replication.h create mode 100644 mm/numa_user_replication.c -- 2.34.1
kunpeng inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IDG4AX ------------------------------------------------- This patch contains preliminary support for user space NUMA replication. This is the first iteration, in the next revisions this patch will be split into multiple pieces. Acked-by: Ilya Hanov <ilya.hanov@huawei-partners.com> Acked-by: Denis Darvish <darvish.denis@huawei.com> Acked-by: Artem Kuzin <artem.kuzin@huawei.com> Co-developed-by: Gadeev Dmitry <gadeev.dmitry@h-partners.com> Signed-off-by: Gadeev Dmitry <gadeev.dmitry@h-partners.com> Co-developed-by: Nikita Panov <panov.nikita@huawei.com> Signed-off-by: Nikita Panov <panov.nikita@huawei.com> --- arch/arm64/include/asm/numa_replication.h | 3 + arch/arm64/mm/init.c | 2 +- arch/arm64/mm/pgd.c | 13 +- fs/exec.c | 18 + fs/proc/base.c | 76 + fs/proc/task_mmu.c | 111 +- include/asm-generic/pgalloc.h | 19 +- include/asm-generic/tlb.h | 22 + include/linux/cgroup.h | 1 + include/linux/gfp_types.h | 12 +- include/linux/memcontrol.h | 4 + include/linux/mm.h | 75 +- include/linux/mm_inline.h | 2 +- include/linux/mm_types.h | 49 +- include/linux/numa_kernel_replication.h | 185 ++- include/linux/numa_user_replication.h | 738 ++++++++++ include/linux/page-flags.h | 18 +- include/trace/events/mmflags.h | 10 +- include/uapi/asm-generic/mman-common.h | 2 + kernel/cgroup/cgroup.c | 2 +- kernel/events/uprobes.c | 5 +- kernel/fork.c | 41 + kernel/sched/fair.c | 8 +- mm/Kconfig | 13 + mm/Makefile | 1 + mm/gup.c | 3 +- mm/ksm.c | 15 +- mm/madvise.c | 18 +- mm/memcontrol.c | 137 +- mm/memory.c | 544 +++++-- mm/mempolicy.c | 5 + mm/migrate.c | 11 +- mm/migrate_device.c | 17 +- mm/mlock.c | 31 + mm/mmap.c | 32 + mm/mmu_gather.c | 55 +- mm/mprotect.c | 409 +++--- mm/mremap.c | 97 +- mm/numa_kernel_replication.c | 4 +- mm/numa_user_replication.c | 1577 +++++++++++++++++++++ mm/page_alloc.c | 8 +- mm/page_idle.c | 3 +- mm/page_vma_mapped.c | 3 +- mm/rmap.c | 41 +- mm/swap.c | 7 +- mm/swapfile.c | 3 +- mm/userfaultfd.c | 7 +- mm/userswap.c | 11 +- 48 files changed, 4049 insertions(+), 419 deletions(-) create mode 100644 include/linux/numa_user_replication.h create mode 100644 mm/numa_user_replication.c diff --git a/arch/arm64/include/asm/numa_replication.h b/arch/arm64/include/asm/numa_replication.h index 7b515c7d41981..d8647a89c5cc2 100644 --- a/arch/arm64/include/asm/numa_replication.h +++ b/arch/arm64/include/asm/numa_replication.h @@ -22,6 +22,9 @@ static inline pgd_t *numa_replicate_pgt_pgd(int nid) pgd_page = alloc_pages_node(nid, GFP_PGTABLE_KERNEL, 2); BUG_ON(pgd_page == NULL); + SetPageReplicated(pgd_page); + SetPageReplicated(pgd_page + 2); + new_pgd = (pgd_t *)page_address(pgd_page); new_pgd += (PAGE_SIZE * 2 / sizeof(pgd_t)); //Extra pages for KPTI copy_page(new_pgd, swapper_pg_dir); diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 8d955787e030f..ef05ba6d6007d 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -606,7 +606,7 @@ void __init preallocate_vmalloc_pages(void) { unsigned long addr; - for (addr = MODULES_VADDR; addr <= VMALLOC_END; + for (addr = MODULES_VADDR; addr <= VMALLOC_END && addr != 0UL; addr = ALIGN(addr + 1, PGDIR_SIZE)) { pgd_t *pgd = pgd_offset_k(addr); p4d_t *p4d; diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c index 8326bd693b296..863b427e54ed8 100644 --- a/arch/arm64/mm/pgd.c +++ b/arch/arm64/mm/pgd.c @@ -41,20 +41,22 @@ pgd_t *page_pgd_alloc(struct mm_struct *mm) { int nid; gfp_t gfp = GFP_PGTABLE_USER | __GFP_THISNODE; + /* * Kernel replication is not supproted in case of non-page size pgd, * in general we can support it, but maybe later, due to we need to * update page tables allocation significantly, so, let's panic here. */ + for_each_memory_node(nid) { struct page *page; page = alloc_pages_node(nid, gfp, 0); if (!page) goto fail; - WARN_ON_ONCE(page_to_nid(page) != nid); + SetPageReplicated(page); *per_node_pgd_ptr(mm, nid) = (pgd_t *)page_address(page); } @@ -62,6 +64,7 @@ pgd_t *page_pgd_alloc(struct mm_struct *mm) *per_node_pgd_ptr(mm, nid) = per_node_pgd(mm, numa_get_memory_node(nid)); mm->pgd = per_node_pgd(mm, numa_get_memory_node(0));/*!!!*/ + build_pgd_chain(mm->pgd_numa); return mm->pgd; @@ -86,15 +89,23 @@ static pgd_t *pgd_alloc_replica(struct mm_struct *mm) static void page_pgd_free(struct mm_struct *mm, pgd_t *pgd) { int nid; + /* * Kernel replication is not supproted in case of non-page size pgd, * in general we can support it, but maybe later, due to we need to * update page tables allocation significantly, so, let's panic here. */ + + if (per_node_pgd(mm, first_memory_node) == NULL) + return; + + clear_pgtable_list(virt_to_ptdesc(per_node_pgd(mm, first_memory_node))); for_each_memory_node(nid) { if (per_node_pgd(mm, nid) == NULL) break; WARN_ON_ONCE(page_to_nid(virt_to_page(per_node_pgd(mm, nid))) != nid); + + ClearPageReplicated(virt_to_page(per_node_pgd(mm, nid))); free_page((unsigned long)per_node_pgd(mm, nid)); } diff --git a/fs/exec.c b/fs/exec.c index eaec57f79aa19..7eaa0f6322736 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -66,6 +66,7 @@ #include <linux/coredump.h> #include <linux/time_namespace.h> #include <linux/user_events.h> +#include <linux/numa_user_replication.h> #include <linux/uaccess.h> #include <asm/mmu_context.h> @@ -276,6 +277,14 @@ static int __bprm_mm_init(struct linux_binprm *bprm) vm_flags_init(vma, VM_SOFTDIRTY | VM_STACK_FLAGS | VM_STACK_INCOMPLETE_SETUP); vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); +#ifdef CONFIG_USER_REPLICATION + if (memcg_replication_enabled(mm)) { + __vm_flags_mod(vma, VM_REPLICA_INIT, VM_NONE); + if (vma_might_be_replicated(vma)) + __vm_flags_mod(vma, VM_REPLICA_COMMIT, VM_NONE); + } +#endif + err = insert_vm_struct(mm, vma); if (err) goto err; @@ -814,6 +823,15 @@ int setup_arg_pages(struct linux_binprm *bprm, vm_flags &= ~VM_EXEC; vm_flags |= mm->def_flags; vm_flags |= VM_STACK_INCOMPLETE_SETUP; +#ifdef CONFIG_USER_REPLICATION + if (memcg_replication_enabled(mm)) { + vm_flags |= VM_REPLICA_INIT; + if (vmflags_might_be_replicated(vm_flags)) + vm_flags |= VM_REPLICA_COMMIT; + else + vm_flags &= ~VM_REPLICA_COMMIT; + } +#endif vma_iter_init(&vmi, mm, vma->vm_start); diff --git a/fs/proc/base.c b/fs/proc/base.c index 276588a25225d..828373ba91042 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -81,6 +81,7 @@ #include <linux/audit.h> #include <linux/poll.h> #include <linux/nsproxy.h> +#include <linux/numa_user_replication.h> #include <linux/oom.h> #include <linux/elf.h> #include <linux/pid_namespace.h> @@ -3503,6 +3504,78 @@ static const struct file_operations proc_pid_xcall_operations = { }; #endif +#ifdef CONFIG_USER_REPLICATION + +static ssize_t numa_replication_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct task_struct *task = get_proc_task(file_inode(file)); + struct mm_struct *mm; + char buffer[PROC_NUMBUF]; + size_t len; + int ret; + + if (!task) + return -ESRCH; + + ret = 0; + mm = get_task_mm(task); + if (mm) { + len = snprintf(buffer, sizeof(buffer), "%d\n", memcg_replication_enabled(mm)); + mmput(mm); + ret = simple_read_from_buffer(buf, count, ppos, buffer, len); + } + + put_task_struct(task); + + return ret; +} + +static ssize_t numa_replication_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct task_struct *task; + struct mm_struct *mm; + int val, ret; + + ret = kstrtoint_from_user(buf, count, 0, &val); + if (ret < 0) + return ret; + + if (!is_text_replicated()) + return -EINVAL; + + ret = -ESRCH; + task = get_proc_task(file_inode(file)); + if (!task) + goto out_no_task; + + mm = get_task_mm(task); + if (!mm) + goto out_no_mm; + ret = 0; + + if ((val != 0 && val != 1) || (val == 0 && memcg_replication_enabled(mm))) + ret = -EINVAL; + else if (val == 1) + numa_mm_handle_replication(mm, true, FORK_DISCARD_REPLICA); + + mmput(mm); +out_no_mm: + put_task_struct(task); +out_no_task: + if (ret < 0) + return ret; + return count; +} + +static const struct file_operations proc_numa_replication_operations = { + .read = numa_replication_read, + .write = numa_replication_write, +}; + +#endif + /* * Thread groups */ @@ -3548,6 +3621,9 @@ static const struct pid_entry tgid_base_stuff[] = { REG("maps", S_IRUGO, proc_pid_maps_operations), #ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), +#endif +#ifdef CONFIG_USER_REPLICATION + REG("numa_replication", S_IRUSR|S_IWUSR, proc_numa_replication_operations), #endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 6d9b173a15450..0097f00281e2c 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -20,6 +20,7 @@ #include <linux/shmem_fs.h> #include <linux/uaccess.h> #include <linux/pkeys.h> +#include <linux/numa_user_replication.h> #include <asm/elf.h> #include <asm/tlb.h> @@ -406,6 +407,10 @@ struct mem_size_stats { u64 pss_dirty; u64 pss_locked; u64 swap_pss; +#ifdef CONFIG_USER_REPLICATION + KABI_EXTEND(unsigned long replicated); + KABI_EXTEND(u64 pss_repl); +#endif }; static void smaps_page_accumulate(struct mem_size_stats *mss, @@ -438,6 +443,20 @@ static void smaps_page_accumulate(struct mem_size_stats *mss, } } +#ifdef CONFIG_USER_REPLICATION +static void smaps_page_accumulate_replicated(struct mem_size_stats *mss, + struct page *page, unsigned long size, unsigned long pss, bool private) +{ + mss->pss += pss; + mss->pss_repl += pss; + + if (private) + mss->private_clean += size; + else + mss->shared_clean += size; +} +#endif + static void smaps_account(struct mem_size_stats *mss, struct page *page, bool compound, bool young, bool dirty, bool locked, bool migration) @@ -493,6 +512,42 @@ static void smaps_account(struct mem_size_stats *mss, struct page *page, } } +#ifdef CONFIG_USER_REPLICATION +static void smaps_account_replicated(struct mem_size_stats *mss, + struct page **replica_pages, bool *numa_young) +{ + int nid; + int page_ref_count = 0; + unsigned long size = PAGE_SIZE; + unsigned long pss = PAGE_SIZE << PSS_SHIFT; + + for_each_memory_node(nid) { + mss->replicated += size; + mss->resident += size; + + if (numa_young[nid] || page_is_young(replica_pages[nid]) || + PageReferenced(replica_pages[nid])) + mss->referenced += size; + + if (!page_ref_count) { + page_ref_count = page_count(replica_pages[nid]); + pss /= page_ref_count; + } else + BUG_ON(page_ref_count != page_count(replica_pages[nid])); + + smaps_page_accumulate_replicated(mss, replica_pages[nid], size, pss, + (page_ref_count == 1)); + } + /* + * We account original page-instance as anonymous page, not replicated + */ + mss->replicated -= size; + mss->anonymous += size; + mss->pss_repl -= pss; + mss->pss_anon += pss; +} +#endif + #ifdef CONFIG_SHMEM static int smaps_pte_hole(unsigned long addr, unsigned long end, __always_unused int depth, struct mm_walk *walk) @@ -529,11 +584,48 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr, struct page *page = NULL; bool migration = false, young = false, dirty = false; pte_t ptent = ptep_get(pte); +#ifdef CONFIG_USER_REPLICATION + bool numa_young[MAX_NUMNODES]; + struct page *replica_pages[MAX_NUMNODES]; +#endif if (pte_present(ptent)) { page = vm_normal_page(vma, addr, ptent); - young = pte_young(ptent); - dirty = pte_dirty(ptent); +#ifdef CONFIG_USER_REPLICATION + if (page && PageReplicated(page)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_pte; + bool start; + int nid; + + for_each_pgtable(curr, curr_pte, pte, nid, offset, start) { + pte_t curr_ptent = ptep_get(curr_pte); + BUG_ON(pte_dirty(curr_ptent)); + numa_young[nid] = pte_young(curr_ptent); + replica_pages[nid] = vm_normal_page(vma, addr, curr_ptent); + } + } else if (numa_pgtable_replicated(pte)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_pte; + + young = pte_young(ptent); + dirty = pte_dirty(ptent); + for_each_pgtable_replica(curr, curr_pte, pte, offset) { + pte_t curr_ptent = ptep_get(curr_pte); + + young |= pte_young(curr_ptent); + dirty |= pte_dirty(curr_ptent); + if (young && dirty) + break; + } + } else +#endif + { + young = pte_young(ptent); + dirty = pte_dirty(ptent); + } } else if (is_swap_pte(ptent)) { swp_entry_t swpent = pte_to_swp_entry(ptent); @@ -554,6 +646,7 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr, if (is_migration_entry(swpent)) migration = true; page = pfn_swap_entry_to_page(swpent); + BUG_ON(page && PageReplicated(page)); } } else { smaps_pte_hole_lookup(addr, walk); @@ -563,7 +656,12 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr, if (!page) return; - smaps_account(mss, page, false, young, dirty, locked, migration); +#ifdef CONFIG_USER_REPLICATION + if (PageReplicated(page)) + smaps_account_replicated(mss, replica_pages, numa_young); + else +#endif + smaps_account(mss, page, false, young, dirty, locked, migration); } #ifdef CONFIG_TRANSPARENT_HUGEPAGE @@ -827,6 +925,10 @@ static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss, mss->pss_file >> PSS_SHIFT); SEQ_PUT_DEC(" kB\nPss_Shmem: ", mss->pss_shmem >> PSS_SHIFT); +#ifdef CONFIG_USER_REPLICATION + SEQ_PUT_DEC(" kb\nPss_Repl: ", + mss->pss_repl >> PSS_SHIFT); +#endif } SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); @@ -834,6 +936,9 @@ static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss, SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); +#ifdef CONFIG_USER_REPLICATION + SEQ_PUT_DEC(" kB\nReplicated: ", mss->replicated); +#endif SEQ_PUT_DEC(" kB\nKSM: ", mss->ksm); SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h index a8b7b343a4ed3..e6013e315fc65 100644 --- a/include/asm-generic/pgalloc.h +++ b/include/asm-generic/pgalloc.h @@ -80,17 +80,17 @@ static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp) static inline pgtable_t __pte_alloc_one_node(unsigned int nid, struct mm_struct *mm, gfp_t gfp) { - struct page *pte; + struct ptdesc *ptdesc; - pte = alloc_pages_node(nid, gfp, 0); - if (!pte) + ptdesc = pagetable_alloc_node(nid, gfp, 0); + if (!ptdesc) return NULL; - if (!pagetable_pte_ctor(page_ptdesc(pte))) { - __free_page(pte); + if (!pagetable_pte_ctor(ptdesc)) { + pagetable_free(ptdesc); return NULL; } - return pte; + return ptdesc_page(ptdesc); } #endif @@ -112,7 +112,7 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm) static inline pgtable_t pte_alloc_one_node(unsigned int nid, struct mm_struct *mm) { - return __pte_alloc_one_node(nid, mm, GFP_PGTABLE_USER | __GFP_THISNODE); + return __pte_alloc_one_node(nid, mm, GFP_PGTABLE_USER | __GFP_THISNODE | __GFP_MAYDIE); } #endif @@ -132,6 +132,7 @@ static inline void pte_free(struct mm_struct *mm, struct page *pte_page) { struct ptdesc *ptdesc = page_ptdesc(pte_page); + ClearPageReplicated(pte_page); pagetable_pte_dtor(ptdesc); pagetable_free(ptdesc); } @@ -179,7 +180,7 @@ static inline pmd_t *pmd_alloc_one_node(unsigned int nid, if (mm == &init_mm) gfp = GFP_PGTABLE_KERNEL; - gfp |= __GFP_THISNODE; + gfp |= __GFP_THISNODE | __GFP_MAYDIE; ptdesc = pagetable_alloc_node(nid, gfp, 0); if (!ptdesc) @@ -234,7 +235,7 @@ static inline pud_t *__pud_alloc_one_node(unsigned int nid, if (mm == &init_mm) gfp = GFP_PGTABLE_KERNEL; - gfp |= __GFP_THISNODE; + gfp |= __GFP_THISNODE | __GFP_MAYDIE; ptdesc = pagetable_alloc_node(nid, gfp, 0); if (!ptdesc) return NULL; diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index 22384baee10e5..7063dbcbf02c9 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -247,7 +247,15 @@ static inline void tlb_remove_table_sync_one(void) { } * If we can't allocate a page to make a big batch of page pointers * to work on, then just handle a few from the on-stack structure. */ +#ifndef CONFIG_USER_REPLICATION #define MMU_GATHER_BUNDLE 8 +#else +#if MAX_NUMNODES < 8 +#define MMU_GATHER_BUNDLE 8 +#else +#define MMU_GATHER_BUNDLE MAX_NUMNODES +#endif +#endif struct mmu_gather_batch { struct mmu_gather_batch *next; @@ -269,6 +277,12 @@ struct mmu_gather_batch { extern bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, bool delay_rmap, int page_size); + +#ifdef CONFIG_USER_REPLICATION +extern bool __tlb_remove_replica_pages_size(struct mmu_gather *tlb, struct page **pages, + int page_size); +#endif + bool __tlb_remove_folio_pages(struct mmu_gather *tlb, struct page *page, unsigned int nr_pages, bool delay_rmap); @@ -482,6 +496,14 @@ static __always_inline bool __tlb_remove_page(struct mmu_gather *tlb, return __tlb_remove_page_size(tlb, page, delay_rmap, PAGE_SIZE); } +#ifdef CONFIG_USER_REPLICATION +static __always_inline bool __tlb_remove_replica_pages(struct mmu_gather *tlb, + struct page **pages) +{ + return __tlb_remove_replica_pages_size(tlb, pages, PAGE_SIZE); +} +#endif + /* tlb_remove_page * Similar to __tlb_remove_page but will call tlb_flush_mmu() itself when * required. diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 62cea15eb6df9..4a3d3023bfdb5 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -137,6 +137,7 @@ int cgroup_init_early(void); int cgroup_init(void); int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v); +bool cgroup_has_tasks(struct cgroup *cgrp); /* * Iteration helpers and macros. diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h index 435a5a8a301e0..7ca6d2f2fe7cf 100644 --- a/include/linux/gfp_types.h +++ b/include/linux/gfp_types.h @@ -59,8 +59,13 @@ typedef unsigned int __bitwise gfp_t; #define ___GFP_SKIP_ZERO 0 #define ___GFP_SKIP_KASAN 0 #endif +#ifdef CONFIG_USER_REPLICATION +#define ___GFP_MAYDIE 0x4000000u +#else +#define ___GFP_MAYDIE 0 +#endif #ifdef CONFIG_LOCKDEP -#define ___GFP_NOLOCKDEP 0x4000000u +#define ___GFP_NOLOCKDEP 0x8000000u #else #define ___GFP_NOLOCKDEP 0 #endif @@ -257,8 +262,11 @@ typedef unsigned int __bitwise gfp_t; /* Alloc memory from mirrored region */ #define __GFP_RELIABLE ((__force gfp_t)___GFP_RELIABLE) +/* May fallback to oom-killer when used with __GFP_THISNODE */ +#define __GFP_MAYDIE ((__force gfp_t)___GFP_MAYDIE) + /* Room for N __GFP_FOO bits */ -#define __GFP_BITS_SHIFT (26 + IS_ENABLED(CONFIG_LOCKDEP)) +#define __GFP_BITS_SHIFT (27 + IS_ENABLED(CONFIG_LOCKDEP)) #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) /** diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index abe236201e68f..9a0e03e58f059 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -421,7 +421,11 @@ struct mem_cgroup { struct dynamic_pool *dpool; #endif +#ifdef CONFIG_USER_REPLICATION + KABI_USE(1, bool user_replication_active) +#else KABI_RESERVE(1) +#endif KABI_RESERVE(2) KABI_RESERVE(3) KABI_RESERVE(4) diff --git a/include/linux/mm.h b/include/linux/mm.h index f706eed1a8b53..7580817f038b6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -336,12 +336,16 @@ extern unsigned int kobjsize(const void *objp); #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_5 37 /* bit only usable on 64-bit architectures */ +#define VM_HIGH_ARCH_BIT_6 39 /* bit only usable on 64-bit architectures */ +#define VM_HIGH_ARCH_BIT_7 40 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) #define VM_HIGH_ARCH_5 BIT(VM_HIGH_ARCH_BIT_5) +#define VM_HIGH_ARCH_6 BIT(VM_HIGH_ARCH_BIT_6) +#define VM_HIGH_ARCH_7 BIT(VM_HIGH_ARCH_BIT_7) #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ #ifdef CONFIG_ARCH_HAS_PKEYS @@ -372,6 +376,21 @@ extern unsigned int kobjsize(const void *objp); # define VM_SHADOW_STACK VM_NONE #endif +#ifdef CONFIG_USER_REPLICATION +/* + * Page tables for this vma will be replicated during page faults + */ +# define VM_REPLICA_INIT VM_HIGH_ARCH_6 +/* + * Phys memory of this vma migth has replicas + * due to mprotect call or numa_balancer replication. + * Also, this flag is used by numa balancer as a hint, that this memory should + * be replicated. Obviously, that if this flag is set, + * VM_REPLICA_INIT also must be set. + */ +# define VM_REPLICA_COMMIT VM_HIGH_ARCH_7 +#endif /* CONFIG_USER_REPLICATION */ + #if defined(CONFIG_X86) # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ #elif defined(CONFIG_PPC) @@ -517,6 +536,20 @@ static inline bool fault_flag_allow_retry_first(enum fault_flag flags) { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }, \ { FAULT_FLAG_VMA_LOCK, "VMA_LOCK" } +typedef enum { + /* Switch to default handling */ + REPLICA_NONE, + /* + * User replication stops here, + * already replicated levels need propagation + */ + REPLICA_PROPAGATE, + /* Keep replicating page tables */ + REPLICA_KEEP, + /* Failed to replicate page table level */ + REPLICA_FAIL, +} replica_action_t; + /* * vm_fault is filled by the pagefault handler and passed to the vma's * ->fault function. The vma's ->fault is responsible for returning a bitmask @@ -571,9 +604,16 @@ struct vm_fault { * page table to avoid allocation from * atomic context. */ - KABI_RESERVE(1) - KABI_RESERVE(2) - KABI_RESERVE(3) + + KABI_EXTEND(unsigned long left_replicant) /* Closest vmas that require replicated tables */ + KABI_EXTEND(unsigned long right_replicant) + KABI_EXTEND(p4d_t *p4d) + KABI_EXTEND(pgd_t *pgd) + KABI_EXTEND(bool pte_replicated :1) + KABI_EXTEND(bool pmd_replicated :1) + KABI_EXTEND(bool pud_replicated :1) + KABI_EXTEND(bool p4d_replicated :1) + KABI_EXTEND(replica_action_t replica_action) /* last action performed with page table */ }; /* @@ -3023,6 +3063,7 @@ static inline struct ptdesc *pagetable_alloc(gfp_t gfp, unsigned int order) return page_ptdesc(page); } +#ifdef CONFIG_KERNEL_REPLICATION static inline struct ptdesc *pagetable_alloc_node(int nid, gfp_t gfp, unsigned int order) { @@ -3030,6 +3071,7 @@ static inline struct ptdesc *pagetable_alloc_node(int nid, gfp_t gfp, return page_ptdesc(page); } +#endif /** * pagetable_free - Free pagetables @@ -3051,15 +3093,40 @@ void __init ptlock_cache_init(void); bool ptlock_alloc(struct ptdesc *ptdesc); void ptlock_free(struct ptdesc *ptdesc); +#ifdef CONFIG_KERNEL_REPLICATION +static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc) +{ + return ptdesc->master_table->ptl; +} +#else static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc) { return ptdesc->ptl; } +#endif + #else /* ALLOC_SPLIT_PTLOCKS */ static inline void ptlock_cache_init(void) { } +#ifdef CONFIG_KERNEL_REPLICATION +static inline bool ptlock_alloc(struct ptdesc *ptdesc) +{ + ptdesc->master_table = ptdesc; + return true; +} + +static inline void ptlock_free(struct ptdesc *ptdesc) +{ + ptdesc->master_table = NULL; +} + +static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc) +{ + return &ptdesc->master_table->ptl; +} +#else static inline bool ptlock_alloc(struct ptdesc *ptdesc) { return true; @@ -3073,6 +3140,8 @@ static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc) { return &ptdesc->ptl; } +#endif + #endif /* ALLOC_SPLIT_PTLOCKS */ static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index 386e1eaac1fa4..82bab18e45c14 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -598,7 +598,7 @@ pte_install_uffd_wp_if_needed(struct vm_area_struct *vma, unsigned long addr, arm_uffd_pte = true; if (unlikely(arm_uffd_pte)) - set_pte_at(vma->vm_mm, addr, pte, + set_pte_at_replicated(vma->vm_mm, addr, pte, make_pte_marker(PTE_MARKER_UFFD_WP)); #endif } diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 6a0015a55211c..cb8737f18e6e5 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -461,12 +461,41 @@ struct ptdesc { pgtable_t pmd_huge_pte; }; }; +#ifdef CONFIG_KERNEL_REPLICATION + KABI_REPLACE( + unsigned long __page_mapping, + union { + unsigned long __page_mapping; + struct llist_head replica_list_head; /* required for connecting */ + struct llist_node replica_list_node; /* replicated tables into lists */ + } + ) + /* + * master_table is used only for pte and pmd levels, + * If we have, for example, 4 replicated pmd tables, + * we need to use single lock to correctly serialize modifications of this level. + * So, this field points to lock from original table. + * If tables are not replicated, or table is master, master_lock + * equals to ptl (or &ptl). + */ + KABI_REPLACE( + union { + struct mm_struct *pt_mm; + atomic_t pt_frag_refcount; + }, + union { + struct mm_struct *pt_mm; + atomic_t pt_frag_refcount; + struct ptdesc *master_table; + } + ) +#else unsigned long __page_mapping; - union { struct mm_struct *pt_mm; atomic_t pt_frag_refcount; }; +#endif union { unsigned long _pt_pad_2; @@ -716,6 +745,18 @@ struct mm_cid { int cid; }; +typedef enum { + /* Used only in not yet initialized mm-instances. + * It is matter for it to be zero. */ + FORK_NO_REPLICA = 0, + /* Used when user-replication shoud not be inherited during forks + * due to disabled user-replication in related mem cgroup. */ + FORK_DISCARD_REPLICA, + /* Used when user-replication should be inherited during forks + * due to enabled user-replication in related mem cgroup. */ + FORK_KEEP_REPLICA +} fork_policy_t; + struct kioctx_table; struct iommu_mm_data; struct mm_struct { @@ -986,7 +1027,13 @@ struct mm_struct { #else KABI_RESERVE(1) #endif + +#ifdef CONFIG_USER_REPLICATION + KABI_USE2(2, bool cg_user_replication_active, fork_policy_t fork_policy) +#else KABI_RESERVE(2) +#endif + KABI_RESERVE(3) KABI_RESERVE(4) KABI_RESERVE(5) diff --git a/include/linux/numa_kernel_replication.h b/include/linux/numa_kernel_replication.h index 37e7b56b5aa94..9607a6162dfc2 100644 --- a/include/linux/numa_kernel_replication.h +++ b/include/linux/numa_kernel_replication.h @@ -2,8 +2,6 @@ #ifndef _LINUX_NUMA_REPLICATION_H #define _LINUX_NUMA_REPLICATION_H -#ifdef CONFIG_KERNEL_REPLICATION - #include <linux/kabi.h> /* @@ -20,6 +18,7 @@ #include KABI_HIDE_INCLUDE(<linux/nodemask.h>) #include KABI_HIDE_INCLUDE(<linux/module.h>) #include KABI_HIDE_INCLUDE(<linux/mm.h>) +#include KABI_HIDE_INCLUDE(<linux/llist.h>) #include KABI_HIDE_INCLUDE(<asm/numa_replication.h>) #if defined(tmp_linux_value) @@ -42,6 +41,8 @@ extern nodemask_t replica_nodes; nid != MAX_NUMNODES; \ nid = next_node(nid, replica_nodes)) +#ifdef CONFIG_KERNEL_REPLICATION + bool is_text_replicated(void); static inline pgd_t *this_node_pgd(struct mm_struct *mm) @@ -74,6 +75,48 @@ static inline bool numa_addr_has_replica(const void *addr) ((unsigned long)addr <= PAGE_TABLE_REPLICATION_RIGHT); } +static inline void clear_pgtable_list(struct ptdesc *head) +{ + struct llist_node *node; + + /* Replica list already have been destroyed */ + if (head->replica_list_node.next == NULL) + return; + + for (node = llist_del_first(&head->replica_list_head); + node != &head->replica_list_node; + node = llist_del_first(&head->replica_list_head)) + node->next = NULL; + head->replica_list_node.next = NULL; +} + +static inline void build_pgd_chain(pgd_t **tables) +{ + int nid; + int prev_node = -1; + for_each_memory_node(nid) { + virt_to_ptdesc(tables[nid])->replica_list_head.first = NULL; + if (prev_node != -1) { + llist_add( + &virt_to_ptdesc(tables[nid])->replica_list_node, &virt_to_ptdesc(tables[prev_node])->replica_list_head); + } else { + /* + * This list is not supposed to be circular, + * but in order to simplify macro implementation, + * we do it anyway. + * God help us + */ + virt_to_ptdesc(tables[nid])->replica_list_node.next = &virt_to_ptdesc(tables[nid])->replica_list_node; + } + prev_node = nid; + } +} + +static inline bool numa_pgtable_replicated(void *table) +{ + return PageReplicated(virt_to_page(table)); +} + void __init numa_replication_init(void); void __init numa_replicate_kernel_text(void); void numa_replicate_kernel_rodata(void); @@ -86,8 +129,63 @@ int numa_get_memory_node(int nid); void dump_mm_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end); +static inline unsigned long offset_in_table(void *ptr) +{ + return (unsigned long)ptr & (~PAGE_MASK); +} + +static inline unsigned long get_table_ptr(struct ptdesc *table, unsigned long offset) +{ + return ((unsigned long)ptdesc_to_virt(table) + offset); +} + +/** + * @pos: struct ptdesc* of current replica + * @table: current table entry to write (virtaul address) + * @head_table: table entry from 0th node, will be a part of this loop + * @nid: node id of current pgtable + * @offset: offset of current table entry in table page in bytes [0 .. 4088] + * @start: boolean value for tmp storage + */ +#define for_each_pgtable(pos, table, head_table, nid, offset, start) \ + for (pos = llist_entry(&virt_to_ptdesc(head_table)->replica_list_node, typeof(*pos), replica_list_node), \ + start = true, nid = page_to_nid(ptdesc_page(pos)), \ + offset = offset_in_table(head_table), table = (typeof(table))get_table_ptr(pos, offset); \ + pos != virt_to_ptdesc(head_table) || start; \ + pos = llist_entry((pos)->replica_list_node.next, typeof(*pos), replica_list_node), \ + table = (typeof(table))get_table_ptr(pos, offset), \ + nid = page_to_nid(ptdesc_page(pos)), start = false) + +/** + * @pos: struct ptdesc* of current replica + * @table: current table entry to write (virtaul address) + * @head_table: table entry from 0th node, will not be a part of this loop + * @offset: offset of current table entry in table page in bytes [0 .. 4088] + */ +#define for_each_pgtable_replica(pos, table, head_table, offset) \ + for (pos = llist_entry(virt_to_ptdesc(head_table)->replica_list_node.next, typeof(*pos), replica_list_node), \ + offset = offset_in_table(head_table), table = (typeof(table))get_table_ptr(pos, offset); \ + pos != virt_to_ptdesc(head_table); \ + pos = llist_entry((pos)->replica_list_node.next, typeof(*pos), replica_list_node), \ + table = (typeof(table))get_table_ptr(pos, offset)) + +/** Safe against removal pos + * @pos: struct ptdesc* of current replica + * @n: tmp storage + * @table: current table entry to write (virtaul address) + * @head_table: table entry from 0th node, will not be a part of this loop + * @offset: offset of current table entry in table page in bytes [0 .. 4088] + */ +#define for_each_pgtable_replica_safe(pos, n, table, head_table, offset) \ + for (pos = llist_entry(virt_to_ptdesc(head_table)->replica_list_node.next, typeof(*pos), replica_list_node), \ + n = llist_entry((pos)->replica_list_node.next, typeof(*pos), replica_list_node), \ + offset = offset_in_table(head_table), table = (typeof(table))get_table_ptr(pos, offset); \ + pos != virt_to_ptdesc(head_table); \ + pos = n, n = llist_entry((pos)->replica_list_node.next, typeof(*pos), replica_list_node), \ + table = (typeof(table))get_table_ptr(pos, offset)) + /* Macro to walk over mm->pgd_numa and cast it to appropriate level type */ -#define for_each_pgtable_replica(table, mm, replica, nid, offset) \ +#define for_each_pgtable_kernel_replica(table, mm, replica, nid, offset) \ for (nid = first_node(replica_nodes), offset = ((unsigned long)table) & (~PAGE_MASK), \ replica = (typeof(table))(((unsigned long)mm->pgd_numa[nid]) + offset); \ nid != MAX_NUMNODES; \ @@ -96,81 +194,82 @@ void dump_mm_pgtables(struct mm_struct *mm, static inline void pgd_populate_replicated(struct mm_struct *mm, pgd_t *pgdp, p4d_t *p4dp) { - int nid; - pgd_t *curr_pgd; - unsigned long offset; + pgd_populate(mm, pgdp, p4dp); + + if (!is_text_replicated()) + return; - if (get_propagation_level() == PGD_PROPAGATION) { - for_each_pgtable_replica(pgdp, mm, curr_pgd, nid, offset) { + if (numa_pgtable_replicated(pgdp)) { + unsigned long offset; + struct ptdesc *curr; + pgd_t *curr_pgd; + for_each_pgtable_replica(curr, curr_pgd, pgdp, offset) { pgd_populate(mm, curr_pgd, p4dp); } - } else { - pgd_populate(mm, pgdp, p4dp); } } static inline void p4d_populate_replicated(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp) { - int nid; - p4d_t *curr_p4d; - unsigned long offset; + p4d_populate(mm, p4dp, pudp); + + if (!is_text_replicated()) + return; - if (get_propagation_level() == P4D_PROPAGATION) { - for_each_pgtable_replica(p4dp, mm, curr_p4d, nid, offset) { + if (numa_pgtable_replicated(p4dp)) { + unsigned long offset; + struct ptdesc *curr; + p4d_t *curr_p4d; + for_each_pgtable_replica(curr, curr_p4d, p4dp, offset) { p4d_populate(mm, curr_p4d, pudp); } - } else { - p4d_populate(mm, p4dp, pudp); } } static inline void pud_populate_replicated(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) { - int nid; - pud_t *curr_pud; - unsigned long offset; + pud_populate(mm, pudp, pmdp); - if (get_propagation_level() == PUD_PROPAGATION) { - for_each_pgtable_replica(pudp, mm, curr_pud, nid, offset) { + if (!is_text_replicated()) + return; + + if (numa_pgtable_replicated(pudp)) { + unsigned long offset; + struct ptdesc *curr; + pud_t *curr_pud; + for_each_pgtable_replica(curr, curr_pud, pudp, offset) { pud_populate(mm, curr_pud, pmdp); } - } else { - pud_populate(mm, pudp, pmdp); } } static inline void pmd_populate_replicated(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) { - int nid; - pmd_t *curr_pmd; - unsigned long offset; + pmd_populate(mm, pmdp, ptep); + + if (!is_text_replicated()) + return; - if (get_propagation_level() == PMD_PROPAGATION) { - for_each_pgtable_replica(pmdp, mm, curr_pmd, nid, offset) { + if (numa_pgtable_replicated(pmdp)) { + unsigned long offset; + struct ptdesc *curr; + pmd_t *curr_pmd; + for_each_pgtable_replica(curr, curr_pmd, pmdp, offset) { pmd_populate(mm, curr_pmd, ptep); } - } else { - pmd_populate(mm, pmdp, ptep); } } #else -#if defined(linux) -#define tmp_linux_value linux -#undef linux -#endif - -#include KABI_HIDE_INCLUDE(<linux/mm.h>) - -#if defined(tmp_linux_value) -#define linux tmp_linux_value -#undef tmp_linux_value -#endif - #define this_node_pgd(mm) ((mm)->pgd) #define per_node_pgd(mm, nid) ((mm)->pgd) +static inline bool numa_pgtable_replicated(void *table) +{ + return false; +} + static inline void numa_setup_pgd(void) { } diff --git a/include/linux/numa_user_replication.h b/include/linux/numa_user_replication.h new file mode 100644 index 0000000000000..74653b7f7da40 --- /dev/null +++ b/include/linux/numa_user_replication.h @@ -0,0 +1,738 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _LINUX_NUMA_USER_REPLICATION_H +#define _LINUX_NUMA_USER_REPLICATION_H + +#include <linux/kabi.h> +#include <linux/mm_inline.h> +#include <linux/numa_kernel_replication.h> + +/* Same as in numa_kernel_replication.h */ +#if defined(linux) +#define tmp_linux_value linux +#undef linux +#endif + +#include KABI_HIDE_INCLUDE(<linux/mempolicy.h>) + +#if defined(tmp_linux_value) +#define linux tmp_linux_value +#undef tmp_linux_value +#endif + +#ifdef CONFIG_USER_REPLICATION + +struct pgtable_private { + pte_t *pte_numa[MAX_NUMNODES]; + struct page *replica_pages[MAX_NUMNODES]; + bool pte_replicated; +}; + +static inline void pgtable_pte_step(struct pgtable_private *zp, int nr) +{ + int nid; + if (zp->pte_replicated) + for_each_memory_node(nid) + zp->pte_numa[nid] += nr; +} + +static inline void pgtable_update_pte(struct pgtable_private *zp, pte_t *pte) +{ + zp->pte_numa[page_to_nid(virt_to_page(pte))] = pte; + zp->pte_replicated = false; + + if (numa_pgtable_replicated(pte)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_pte; + int nid; + zp->pte_replicated = true; + + for_each_pgtable_replica(curr, curr_pte, pte, offset) { + nid = page_to_nid(ptdesc_page(curr)); + zp->pte_numa[nid] = curr_pte; + } + } +} + +static inline void set_master_page_for_puds(int allocated_node, pud_t **new) +{ + int nid; + struct ptdesc *master_table; + struct ptdesc *curr_table; + + if (allocated_node == NUMA_NO_NODE) + allocated_node = first_memory_node; + + master_table = virt_to_ptdesc(new[allocated_node]); + + for_each_memory_node(nid) { + curr_table = virt_to_ptdesc(new[nid]); + curr_table->master_table = master_table; + } +} + +static inline void set_master_page_for_pmds(int allocated_node, pmd_t **new) +{ + int nid; + struct ptdesc *master_table; + struct ptdesc *curr_table; + + if (allocated_node == NUMA_NO_NODE) + allocated_node = first_memory_node; + + master_table = virt_to_ptdesc(new[allocated_node]); + + for_each_memory_node(nid) { + if (nid == allocated_node) + continue; + curr_table = virt_to_ptdesc(new[nid]); + curr_table->master_table = master_table; + } +} + +static inline void set_master_page_for_ptes(int allocated_node, struct ptdesc **new) +{ + int nid; + struct ptdesc *master_table; + struct ptdesc *curr_table; + + if (allocated_node == NUMA_NO_NODE) + allocated_node = first_memory_node; + + master_table = new[allocated_node]; + + for_each_memory_node(nid) { + if (nid == allocated_node) + continue; + curr_table = new[nid]; + curr_table->master_table = master_table; + } +} + +void numa_mm_handle_replication(struct mm_struct *mm, bool enable, fork_policy_t fork_policy); +int phys_duplicate(struct vm_area_struct *vma, unsigned long start, size_t len); +int phys_deduplicate(struct vm_area_struct *vma, unsigned long start, size_t len, bool alloc_new_page); +unsigned long phys_duplicate_pte_range(struct mmu_gather *tlb, struct vm_area_struct *vma, + pmd_t *pmd, unsigned long addr, unsigned long end); + +static inline int numa_is_vma_replicant(struct vm_area_struct *vma) +{ + if (vma->vm_flags & VM_REPLICA_INIT) + return 1; + return 0; +} + +static inline bool vma_has_replicas(struct vm_area_struct *vma) +{ + return vma->vm_flags & VM_REPLICA_COMMIT; +} + +static inline bool vmflags_might_be_replicated(vm_flags_t vm_flags) +{ + return (vm_flags & VM_REPLICA_INIT) && (vm_flags & VM_ACCESS_FLAGS) && + !(vm_flags & (VM_WRITE | VM_SHARED | VM_LOCKED_MASK)); +} + +static inline bool vma_might_be_replicated(struct vm_area_struct *vma) +{ + return (vma->vm_file || vma_is_anonymous(vma)) && + vmflags_might_be_replicated(vma->vm_flags); +} + +static inline bool memcg_replication_enabled(struct mm_struct *mm) +{ + return mm->cg_user_replication_active; +} + +/* + * Arch specific implementation + */ +#if defined(CONFIG_ARM64) && !defined(CONFIG_ARM64_CONTPTE) + +static inline void set_ptes_replicated(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte, unsigned int nr) +{ + pte_t *ptep_numa[MAX_NUMNODES]; + unsigned long offset; + bool start; + struct ptdesc *curr; + pte_t *curr_ptep; + int nid; + + if (!numa_pgtable_replicated(ptep)) + return set_ptes(mm, addr, ptep, pte, nr); + + for_each_pgtable(curr, curr_ptep, ptep, nid, offset, start) { + ptep_numa[nid] = curr_ptep; + } + + for_each_memory_node(nid) + page_table_check_ptes_set(mm, ptep_numa[nid], pte, nr); + __sync_cache_and_tags(pte, nr); + + for (;;) { + for_each_memory_node(nid) + __check_safe_pte_update(mm, ptep_numa[nid], pte); + + for_each_memory_node(nid) + WRITE_ONCE(*ptep_numa[nid], pte); + if (pte_valid_not_user(pte)) { + dsb(ishst); + isb(); + } + + if (--nr == 0) + break; + for_each_memory_node(nid) + ptep_numa[nid]++; + pte = pte_advance_pfn(pte, 1); + } +} +#define set_pte_at_replicated(mm, addr, ptep, pte) set_ptes_replicated(mm, addr, ptep, pte, 1) + +#ifdef CONFIG_MMU_NOTIFIER +#define set_pte_at_notify_replicated(__mm, __address, __ptep, __pte) \ +({ \ + struct mm_struct *___mm = __mm; \ + unsigned long ___address = __address; \ + pte_t ___pte = __pte; \ + \ + mmu_notifier_change_pte(___mm, ___address, ___pte); \ + set_pte_at_replicated(___mm, ___address, __ptep, ___pte); \ +}) +#else +#define set_pte_at_notify_replicated set_pte_at_replicated +#endif + +static inline void wrprotect_ptes_replicated(struct mm_struct *mm, + unsigned long addr, pte_t *ptep, unsigned int nr) +{ + wrprotect_ptes(mm, addr, ptep, nr); + + if (numa_pgtable_replicated(ptep)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_ptep; + for_each_pgtable_replica(curr, curr_ptep, ptep, offset) { + wrprotect_ptes(mm, addr, curr_ptep, nr); + } + } +} + +static inline void pte_clear_replicated(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + pte_t pte = __pte(0); + + WRITE_ONCE(*ptep, pte); + + if (numa_pgtable_replicated(ptep)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_ptep; + for_each_pgtable_replica(curr, curr_ptep, ptep, offset) + WRITE_ONCE(*curr_ptep, pte); + } + + /* + * Only if the new pte is valid and kernel, otherwise TLB maintenance + * or update_mmu_cache() have the necessary barriers. + */ + if (pte_valid_not_user(pte)) { + dsb(ishst); + isb(); + } +} + +static inline void pmd_clear_replicated(pmd_t *pmdp) +{ + pmd_t pmd = __pmd(0); + +#ifdef __PAGETABLE_PMD_FOLDED + if (in_swapper_pgdir(pmdp)) { + BUG_ON(numa_pgtable_replicated(pmdp)); + set_swapper_pgd((pgd_t *)pmdp, __pgd(pmd_val(pmd))); + return; + } +#endif /* __PAGETABLE_PMD_FOLDED */ + + WRITE_ONCE(*pmdp, pmd); + + if (numa_pgtable_replicated(pmdp)) { + unsigned long offset; + struct ptdesc *curr; + pmd_t *curr_pmdp; + for_each_pgtable_replica(curr, curr_pmdp, pmdp, offset) + WRITE_ONCE(*curr_pmdp, pmd); + } + + if (pmd_valid(pmd)) { + dsb(ishst); + isb(); + } +} + +static inline void pud_clear_replicated(pud_t *pudp) +{ + pud_t pud = __pud(0); + +#ifdef __PAGETABLE_PUD_FOLDED + if (in_swapper_pgdir(pudp)) { + BUG_ON(numa_pgtable_replicated(pudp)); + set_swapper_pgd((pgd_t *)pudp, __pgd(pud_val(pud))); + return; + } +#endif /* __PAGETABLE_PUD_FOLDED */ + + WRITE_ONCE(*pudp, pud); + + if (numa_pgtable_replicated(pudp)) { + unsigned long offset; + struct ptdesc *curr; + pud_t *curr_pudp; + for_each_pgtable_replica(curr, curr_pudp, pudp, offset) + WRITE_ONCE(*curr_pudp, pud); + } + + if (pud_valid(pud)) { + dsb(ishst); + isb(); + } +} + +static inline void pte_clear_not_present_full_replicated(struct mm_struct *mm, + unsigned long address, pte_t *ptep, int full) +{ + pte_clear_replicated(mm, address, ptep); +} + +static inline void clear_not_present_full_ptes_replicated(struct mm_struct *mm, + unsigned long addr, pte_t *ptep, unsigned int nr, int full) +{ + for (;;) { + pte_clear_not_present_full_replicated(mm, addr, ptep, full); + if (--nr == 0) + break; + ptep++; + addr += PAGE_SIZE; + } +} + +static inline pte_t ptep_get_and_clear_replicated(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + pte_t pte = ptep_get_and_clear(mm, addr, ptep); + + if (numa_pgtable_replicated(ptep)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_ptep; + for_each_pgtable_replica(curr, curr_ptep, ptep, offset) { + pte_t curr_pte = ptep_get_and_clear(mm, addr, curr_ptep); + + if (pte_dirty(curr_pte)) + pte = pte_mkdirty(pte); + if (pte_young(curr_pte)) + pte = pte_mkyoung(pte); + } + } + + return pte; +} + +static inline pte_t ptep_clear_flush_replicated(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) +{ + struct mm_struct *mm = (vma)->vm_mm; + pte_t pte; + pte = ptep_get_and_clear_replicated(mm, address, ptep); + if (pte_accessible(mm, pte)) + flush_tlb_page(vma, address); + return pte; +} + +static inline pte_t ptep_modify_prot_start_replicated(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + if (IS_ENABLED(CONFIG_ARM64_ERRATUM_2645198) && + cpus_have_const_cap(ARM64_WORKAROUND_2645198)) { + /* + * Break-before-make (BBM) is required for all user space mappings + * when the permission changes from executable to non-executable + * in cases where cpu is affected with errata #2645198. + */ + if (pte_user_exec(ptep_get(ptep))) + return ptep_clear_flush_replicated(vma, addr, ptep); + } + return ptep_get_and_clear_replicated(vma->vm_mm, addr, ptep); +} + +static inline void ptep_modify_prot_commit_replicated(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, pte_t old_pte, pte_t pte) +{ + set_pte_at_replicated(vma->vm_mm, addr, ptep, pte); +} + +static inline int ptep_test_and_clear_young_replicated(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) +{ + int ret = ptep_test_and_clear_young(vma, address, ptep); + + if (numa_pgtable_replicated(ptep)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_ptep; + for_each_pgtable_replica(curr, curr_ptep, ptep, offset) { + ret |= ptep_test_and_clear_young(vma, address, curr_ptep); + } + } + + return ret; +} + +static inline int ptep_clear_flush_young_replicated(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) +{ + int young = ptep_test_and_clear_young_replicated(vma, address, ptep); + + if (young) { + /* + * We can elide the trailing DSB here since the worst that can + * happen is that a CPU continues to use the young entry in its + * TLB and we mistakenly reclaim the associated page. The + * window for such an event is bounded by the next + * context-switch, which provides a DSB to complete the TLB + * invalidation. + */ + flush_tlb_page_nosync(vma, address); + } + + return young; +} + +#ifdef CONFIG_MMU_NOTIFIER +#define ptep_clear_young_notify_replicated(__vma, __address, __ptep) \ +({ \ + int __young; \ + struct vm_area_struct *___vma = __vma; \ + unsigned long ___address = __address; \ + __young = ptep_test_and_clear_young_replicated(___vma, ___address, __ptep);\ + __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ + ___address + PAGE_SIZE); \ + __young; \ +}) + +#define ptep_clear_flush_young_notify_replicated(__vma, __address, __ptep) \ +({ \ + int __young; \ + struct vm_area_struct *___vma = __vma; \ + unsigned long ___address = __address; \ + __young = ptep_clear_flush_young_replicated(___vma, ___address, __ptep); \ + __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ + ___address, \ + ___address + \ + PAGE_SIZE); \ + __young; \ +}) +#else +#define ptep_clear_young_notify_replicated ptep_test_and_clear_young_replicated +#define ptep_clear_flush_young_notify_replicated ptep_clear_flush_young_replicated +#endif + +static inline int __ptep_set_access_flags_no_flush(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep, pte_t entry) +{ + pteval_t old_pteval, pteval; + pte_t pte = __ptep_get(ptep); + + if (pte_same(pte, entry)) + return 0; + + /* only preserve the access flags and write permission */ + pte_val(entry) &= PTE_RDONLY | PTE_AF | PTE_WRITE | PTE_DIRTY; + + /* + * Setting the flags must be done atomically to avoid racing with the + * hardware update of the access/dirty state. The PTE_RDONLY bit must + * be set to the most permissive (lowest value) of *ptep and entry + * (calculated as: a & b == ~(~a | ~b)). + */ + pte_val(entry) ^= PTE_RDONLY; + pteval = pte_val(pte); + do { + old_pteval = pteval; + pteval ^= PTE_RDONLY; + pteval |= pte_val(entry); + pteval ^= PTE_RDONLY; + pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval); + } while (pteval != old_pteval); + + return 1; +} + +static inline int ptep_set_access_flags_replicated(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, pte_t entry, int dirty) +{ + int ret = __ptep_set_access_flags_no_flush(vma, addr, ptep, entry); + + if (numa_pgtable_replicated(ptep)) { + pgprot_t prot = pte_pgprot(entry); + + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_ptep; + for_each_pgtable_replica(curr, curr_ptep, ptep, offset) { + WARN_ON(!pte_present(__ptep_get(curr_ptep))); + + entry = pfn_pte(pte_pfn(__ptep_get(curr_ptep)), prot); + ret |= __ptep_set_access_flags_no_flush(vma, addr, curr_ptep, entry); + } + } + + /* Invalidate a stale read-only entry */ + if (dirty) + flush_tlb_page(vma, addr); + + return ret; +} + +static inline void clear_young_dirty_ptes_replicated(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr, cydp_t flags) +{ + clear_young_dirty_ptes(vma, addr, ptep, nr, flags); + + if (numa_pgtable_replicated(ptep)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_ptep; + for_each_pgtable_replica(curr, curr_ptep, ptep, offset) + clear_young_dirty_ptes(vma, addr, curr_ptep, nr, flags); + } +} + +#endif + +static inline void build_pte_chain(struct ptdesc **tables) +{ + int nid; + int prev_node = -1; + for_each_memory_node(nid) { + tables[nid]->replica_list_head.first = NULL; + if (prev_node != -1) { + llist_add(&tables[nid]->replica_list_node, &tables[prev_node]->replica_list_head); + } else { + tables[nid]->replica_list_node.next = &tables[nid]->replica_list_node; + } + prev_node = nid; + } +} + +static inline void build_pmd_chain(pmd_t **tables) +{ + int nid; + int prev_node = -1; + for_each_memory_node(nid) { + struct ptdesc *curr_ptdesc = virt_to_ptdesc(tables[nid]); + + curr_ptdesc->replica_list_head.first = NULL; + if (prev_node != -1) { + struct ptdesc *prev_ptdesc = virt_to_ptdesc(tables[prev_node]); + llist_add(&curr_ptdesc->replica_list_node, &prev_ptdesc->replica_list_head); + } else { + curr_ptdesc->replica_list_node.next = &curr_ptdesc->replica_list_node; + } + prev_node = nid; + } +} + +static inline void build_pud_chain(pud_t **tables) +{ + int nid; + int prev_node = -1; + for_each_memory_node(nid) { + struct ptdesc *curr_ptdesc = virt_to_ptdesc(tables[nid]); + + curr_ptdesc->replica_list_head.first = NULL; + if (prev_node != -1) { + struct ptdesc *prev_ptdesc = virt_to_ptdesc(tables[prev_node]); + llist_add(&curr_ptdesc->replica_list_node, &prev_ptdesc->replica_list_head); + } else { + curr_ptdesc->replica_list_node.next = &curr_ptdesc->replica_list_node; + } + prev_node = nid; + } +} + +static inline void build_p4d_chain(p4d_t **tables) +{ + int nid; + int prev_node = -1; + for_each_memory_node(nid) { + struct ptdesc *curr_ptdesc = virt_to_ptdesc(tables[nid]); + + curr_ptdesc->replica_list_head.first = NULL; + if (prev_node != -1) { + struct ptdesc *prev_ptdesc = virt_to_ptdesc(tables[prev_node]); + llist_add(&curr_ptdesc->replica_list_node, &prev_ptdesc->replica_list_head); + } else { + curr_ptdesc->replica_list_node.next = &curr_ptdesc->replica_list_node; + } + prev_node = nid; + } +} + +pgd_t *fault_pgd_offset(struct vm_fault *vmf, unsigned long address); +p4d_t *fault_p4d_alloc(struct vm_fault *vmf, struct mm_struct *mm, pgd_t *pgd, unsigned long address); +pud_t *fault_pud_alloc(struct vm_fault *vmf, struct mm_struct *mm, p4d_t *p4d, unsigned long address); +pmd_t *fault_pmd_alloc(struct vm_fault *vmf, struct mm_struct *mm, pud_t *pud, unsigned long address); +int fault_pte_alloc(struct vm_fault *vmf); + +pte_t *cpr_alloc_pte_map_lock(struct mm_struct *dst_mm, unsigned long addr, + pmd_t *src_pmd, pmd_t *dst_pmd, spinlock_t **ptl); +pmd_t *cpr_alloc_pmd(struct mm_struct *dst_mm, unsigned long addr, + pud_t *src_pud, pud_t *dst_pud); +pud_t *cpr_alloc_pud(struct mm_struct *dst_mm, unsigned long addr, + p4d_t *src_p4d, p4d_t *dst_p4d); +p4d_t *cpr_alloc_p4d(struct mm_struct *dst_mm, unsigned long addr, + pgd_t *src_pgd, pgd_t *dst_pgd); + +static inline void cleanup_pte_list(pgtable_t table) +{ + page_ptdesc(table)->replica_list_node.next = NULL; +} + +static inline void cleanup_pmd_list(struct ptdesc *table) +{ +#ifndef __PAGETABLE_PMD_FOLDED + table->replica_list_node.next = NULL; +#endif +} + +static inline void cleanup_pud_list(struct ptdesc *table) +{ +#ifndef __PAGETABLE_PUD_FOLDED + table->replica_list_node.next = NULL; +#endif +} + +static inline void cleanup_p4d_list(struct ptdesc *table) +{ +#ifndef __PAGETABLE_P4D_FOLDED + table->replica_list_node.next = NULL; +#endif +} + +#else /* !CONFIG_USER_REPLICATION */ + +struct pgtable_private { + pte_t **pte_numa; + struct page **replica_pages; + bool pte_replicated; +}; + +static inline void pgtable_pte_step(struct pgtable_private *zp, int nr) { } +static inline void pgtable_update_pte(struct pgtable_private *zp, pte_t *pte) +{ + zp->pte_replicated = false; +} + +static inline int numa_is_vma_replicant(struct vm_area_struct *vma) +{ + return 0; +} + +static inline bool vma_has_replicas(struct vm_area_struct *vma) +{ + return 0; +} + +static inline bool vmflags_might_be_replicated(vm_flags_t vm_flags) +{ + return 0; +} + +static inline bool vma_might_be_replicated(struct vm_area_struct *vma) +{ + return 0; +} + +static inline bool memcg_replication_enabled(struct mm_struct *mm) +{ + return 0; +} + +static inline pgd_t *fault_pgd_offset(struct vm_fault *vmf, unsigned long address) +{ + return pgd_offset(vmf->vma->vm_mm, address); +} + +static inline p4d_t *fault_p4d_alloc(struct vm_fault *vmf, struct mm_struct *mm, pgd_t *pgd, unsigned long address) +{ + return p4d_alloc(mm, pgd, address); +} + +static inline pud_t *fault_pud_alloc(struct vm_fault *vmf, struct mm_struct *mm, p4d_t *p4d, unsigned long address) +{ + return pud_alloc(mm, p4d, address); +} + +static inline pmd_t *fault_pmd_alloc(struct vm_fault *vmf, struct mm_struct *mm, pud_t *pud, unsigned long address) +{ + return pmd_alloc(mm, pud, address); +} + +static inline int fault_pte_alloc(struct vm_fault *vmf) +{ + return 0; +} + +static inline pte_t *cpr_alloc_pte_map_lock(struct mm_struct *dst_mm, unsigned long addr, + pmd_t *src_pmd, pmd_t *dst_pmd, spinlock_t **ptl) +{ + return pte_alloc_map_lock(dst_mm, dst_pmd, addr, ptl); +} + +static inline pmd_t *cpr_alloc_pmd(struct mm_struct *dst_mm, unsigned long addr, + pud_t *src_pud, pud_t *dst_pud) +{ + return pmd_alloc(dst_mm, dst_pud, addr); +} + +static inline pud_t *cpr_alloc_pud(struct mm_struct *dst_mm, unsigned long addr, + p4d_t *src_p4d, p4d_t *dst_p4d) +{ + return pud_alloc(dst_mm, dst_p4d, addr); +} + +static inline p4d_t *cpr_alloc_p4d(struct mm_struct *dst_mm, unsigned long addr, + pgd_t *src_pgd, pgd_t *dst_pgd) +{ + return p4d_alloc(dst_mm, dst_pgd, addr); +} + +#define set_ptes_replicated set_ptes +#define set_pte_at_replicated set_pte_at +#define set_pte_at_notify_replicated set_pte_at_notify + +#define wrprotect_ptes_replicated wrprotect_ptes + +#define pte_clear_replicated pte_clear +#define pmd_clear_replicated pmd_clear +#define pud_clear_replicated pud_clear + +#define pte_clear_not_present_full_replicated pte_clear_not_present_full +#define clear_not_present_full_ptes_replicated clear_not_present_full_ptes + +#define ptep_get_and_clear_replicated ptep_get_and_clear +#define ptep_clear_flush_replicated ptep_clear_flush +#define ptep_modify_prot_start_replicated ptep_modify_prot_start +#define ptep_modify_prot_commit_replicated ptep_modify_prot_commit +#define ptep_clear_young_notify_replicated ptep_clear_young_notify +#define ptep_clear_flush_young_notify_replicated ptep_clear_flush_young_notify + +#define ptep_set_access_flags_replicated ptep_set_access_flags +#define clear_young_dirty_ptes_replicated clear_young_dirty_ptes + +#endif /* CONFIG_USER_REPLICATION */ + +#endif /* _LINUX_NUMA_USER_REPLICATION_H */ diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 7a67d997eecea..e784fca29060b 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -139,6 +139,10 @@ enum pageflags { #ifdef CONFIG_DYNAMIC_POOL PG_pool, /* Page is allocated from dynamic pool */ #endif + +#ifdef CONFIG_KERNEL_REPLICATION + PG_replicated, +#endif __NR_PAGEFLAGS, PG_readahead = PG_reclaim, @@ -635,6 +639,12 @@ PAGEFLAG(Pool, pool, PF_NO_TAIL) PAGEFLAG_FALSE(Pool, pool) #endif +#ifdef CONFIG_KERNEL_REPLICATION +PAGEFLAG(Replicated, replicated, PF_ANY) +#else +PAGEFLAG_FALSE(Replicated, replicated) +#endif + /* * On an anonymous page mapped into a user virtual memory area, * page->mapping points to its anon_vma, not to a struct address_space; @@ -1092,6 +1102,12 @@ static __always_inline void __ClearPageAnonExclusive(struct page *page) #define __PG_MLOCKED 0 #endif +#ifdef CONFIG_KERNEL_REPLICATION +#define __PG_REPLICATED (1UL << PG_replicated) +#else +#define __PG_REPLICATED 0 +#endif + /* * Flags checked when a page is freed. Pages being freed should not have * these flags set. If they are, there is a problem. @@ -1101,7 +1117,7 @@ static __always_inline void __ClearPageAnonExclusive(struct page *page) 1UL << PG_private | 1UL << PG_private_2 | \ 1UL << PG_writeback | 1UL << PG_reserved | \ 1UL << PG_slab | 1UL << PG_active | \ - 1UL << PG_unevictable | __PG_MLOCKED | LRU_GEN_MASK) + 1UL << PG_unevictable | __PG_REPLICATED | __PG_MLOCKED | LRU_GEN_MASK) /* * Flags checked when a page is prepped for return by the page allocator. diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index 6104fa2b6e477..9658b8f17c393 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -51,7 +51,8 @@ gfpflag_string(__GFP_DIRECT_RECLAIM), \ gfpflag_string(__GFP_KSWAPD_RECLAIM), \ gfpflag_string(__GFP_ZEROTAGS), \ - gfpflag_string(__GFP_RELIABLE) + gfpflag_string(__GFP_RELIABLE), \ + gfpflag_string(__GFP_MAYDIE) #ifdef CONFIG_KASAN_HW_TAGS #define __def_gfpflag_names_kasan , \ @@ -96,6 +97,12 @@ #define IF_HAVE_PG_POOL(_name) #endif +#ifdef CONFIG_KERNEL_REPLICATION +#define IF_HAVE_PG_REPLICATED(_name) ,{1UL << PG_##_name, __stringify(_name)} +#else +#define IF_HAVE_PG_REPLICATED(_name) +#endif + #ifdef CONFIG_ARCH_USES_PG_ARCH_X #define IF_HAVE_PG_ARCH_X(_name) ,{1UL << PG_##_name, __stringify(_name)} #else @@ -132,6 +139,7 @@ IF_HAVE_PG_HWPOISON(hwpoison) \ IF_HAVE_PG_IDLE(idle) \ IF_HAVE_PG_IDLE(young) \ IF_HAVE_PG_POOL(pool) \ +IF_HAVE_PG_REPLICATED(replicated) \ IF_HAVE_PG_ARCH_X(arch_2) \ IF_HAVE_PG_ARCH_X(arch_3) diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index 14e5498efd7ac..26e2856929032 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -16,6 +16,7 @@ #define PROT_NONE 0x0 /* page can not be accessed */ #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ +#define PROT_REPLICA 0x200000 /* VM_REPLICA_COMMIT make replicated pte entries to point to copied numa-local physical pages */ /* 0x01 - 0x03 are defined in linux/mman.h */ #define MAP_TYPE 0x0f /* Mask for type of mapping */ @@ -29,6 +30,7 @@ #define MAP_HUGETLB 0x040000 /* create a huge page mapping */ #define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */ #define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */ +#define MAP_REPLICA 0x200000 /* VM_REPLICA_INIT */ #define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be * uninitialized */ diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index c26a9b3a35768..d0362c46b1480 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -352,7 +352,7 @@ static void cgroup_idr_remove(struct idr *idr, int id) spin_unlock_bh(&cgroup_idr_lock); } -static bool cgroup_has_tasks(struct cgroup *cgrp) +bool cgroup_has_tasks(struct cgroup *cgrp) { return cgrp->nr_populated_csets; } diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 1060cf1524370..5face8ad9d3a2 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -26,6 +26,7 @@ #include <linux/task_work.h> #include <linux/shmem_fs.h> #include <linux/khugepaged.h> +#include <linux/numa_user_replication.h> #include <linux/uprobes.h> @@ -194,9 +195,9 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, } flush_cache_page(vma, addr, pte_pfn(ptep_get(pvmw.pte))); - ptep_clear_flush(vma, addr, pvmw.pte); + ptep_clear_flush_replicated(vma, addr, pvmw.pte); if (new_page) - set_pte_at_notify(mm, addr, pvmw.pte, + set_pte_at_notify_replicated(mm, addr, pvmw.pte, mk_pte(new_page, vma->vm_page_prot)); add_reliable_folio_counter(old_folio, mm, -1); diff --git a/kernel/fork.c b/kernel/fork.c index f30b24c68442b..5b2a9806b4f88 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -96,6 +96,7 @@ #include <linux/scs.h> #include <linux/io_uring.h> #include <linux/bpf.h> +#include <linux/numa_user_replication.h> #include <linux/stackprotector.h> #include <linux/user_events.h> #include <linux/iommu.h> @@ -749,6 +750,21 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, */ if (is_vm_hugetlb_page(tmp)) hugetlb_dup_vma_private(tmp); +#ifdef CONFIG_USER_REPLICATION + /* + * clear VM_REPLICA_... flags in case of discarding replication + */ + if (memcg_replication_enabled(oldmm) && !memcg_replication_enabled(mm)) { + vm_flags_clear(tmp, VM_REPLICA_INIT | VM_REPLICA_COMMIT); + } + /* + * VM_LOCKED_MASK was cleared above, so tmp may possibly become + * might_be_replicated. + */ + else if (memcg_replication_enabled(mm) && vma_might_be_replicated(tmp)) { + vm_flags_mod(tmp, VM_REPLICA_COMMIT, VM_NONE); + } +#endif /* * Link the vma into the MT. After using __mt_dup(), memory @@ -1320,6 +1336,30 @@ static void mm_init_uprobes_state(struct mm_struct *mm) #endif } +static void mm_init_numa_replication_state(struct mm_struct *mm) +{ +#ifdef CONFIG_USER_REPLICATION + switch (mm->fork_policy) { + case FORK_NO_REPLICA: + mm->cg_user_replication_active = + get_mem_cgroup_from_mm(mm)->user_replication_active; + if (mm->cg_user_replication_active) + mm->fork_policy = FORK_KEEP_REPLICA; + else + mm->fork_policy = FORK_DISCARD_REPLICA; + break; + case FORK_DISCARD_REPLICA: + mm->cg_user_replication_active = 0; + break; + case FORK_KEEP_REPLICA: + BUG_ON(!mm->cg_user_replication_active); + break; + default: + BUG(); + } +#endif +} + static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, struct user_namespace *user_ns) { @@ -1352,6 +1392,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, mm->pmd_huge_pte = NULL; #endif mm_init_uprobes_state(mm); + mm_init_numa_replication_state(mm); hugetlb_count_init(mm); if (current->mm) { diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index be1d355491449..cfee7847b1087 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -48,6 +48,7 @@ #include <linux/ratelimit.h> #include <linux/task_work.h> #include <linux/rbtree_augmented.h> +#include <linux/numa_user_replication.h> #include <asm/switch_to.h> @@ -3428,7 +3429,7 @@ static void task_numa_work(struct callback_head *work) } for (; vma; vma = vma_next(&vmi)) { - if (!vma_migratable(vma) || !vma_policy_mof(vma) || + if (!vma_migratable(vma) || (!vma_policy_mof(vma) && !vma_has_replicas(vma)) || is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) { continue; } @@ -3439,8 +3440,9 @@ static void task_numa_work(struct callback_head *work) * hinting faults in read-only file-backed mappings or the vdso * as migrating the pages will be of marginal benefit. */ - if (!vma->vm_mm || - (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ))) + if ((!vma->vm_mm || + (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ))) && + !vma_has_replicas(vma)) continue; /* diff --git a/mm/Kconfig b/mm/Kconfig index 845ff9619d3ef..57a23b7379852 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1308,6 +1308,19 @@ config KERNEL_REPLICATION Page tables are replicated partially, according to replicated kernel memory range. If unsure, say "n". +config USER_REPLICATION + bool "infrastructure for userspace replication between NUMA nodes" + default n + depends on KERNEL_REPLICATION && !TRANSPARENT_HUGEPAGE + select ARCH_USES_HIGH_VMA_FLAGS + + help + Provide interfaces for per NUMA node replication of some userspace mappings. + First of all it made for text, ro-data and ro after init data. This feature + doesn't support THP now. + + If unsure, say "n". + config IOMMU_MM_DATA bool diff --git a/mm/Makefile b/mm/Makefile index 45058cdf65d89..1dd967c39e937 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -141,6 +141,7 @@ obj-$(CONFIG_HAVE_BOOTMEM_INFO_NODE) += bootmem_info.o obj-$(CONFIG_GENERIC_IOREMAP) += ioremap.o obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o obj-$(CONFIG_KERNEL_REPLICATION) += numa_kernel_replication.o +obj-$(CONFIG_USER_REPLICATION) += numa_user_replication.o obj-$(CONFIG_SHARE_POOL) += share_pool.o obj-$(CONFIG_MEMCG_MEMFS_INFO) += memcg_memfs_info.o obj-$(CONFIG_ETMEM) += etmem.o diff --git a/mm/gup.c b/mm/gup.c index 33e8e66b3a773..0e516de0f8b30 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -19,6 +19,7 @@ #include <linux/mm_inline.h> #include <linux/sched/mm.h> #include <linux/shmem_fs.h> +#include <linux/numa_user_replication.h> #include <asm/mmu_context.h> #include <asm/tlbflush.h> @@ -441,7 +442,7 @@ static int follow_pfn_pte(struct vm_area_struct *vma, unsigned long address, entry = pte_mkyoung(entry); if (!pte_same(orig_entry, entry)) { - set_pte_at(vma->vm_mm, address, pte, entry); + set_pte_at_replicated(vma->vm_mm, address, pte, entry); update_mmu_cache(vma, address, pte); } } diff --git a/mm/ksm.c b/mm/ksm.c index dac2b6d5c8298..dd234a8b7f773 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -40,6 +40,7 @@ #include <linux/oom.h> #include <linux/numa.h> #include <linux/pagewalk.h> +#include <linux/numa_user_replication.h> #include <asm/tlbflush.h> #include "internal.h" @@ -1138,20 +1139,20 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, * * See Documentation/mm/mmu_notifier.rst */ - entry = ptep_clear_flush(vma, pvmw.address, pvmw.pte); + entry = ptep_clear_flush_replicated(vma, pvmw.address, pvmw.pte); /* * Check that no O_DIRECT or similar I/O is in progress on the * page */ if (page_mapcount(page) + 1 + swapped != page_count(page)) { - set_pte_at(mm, pvmw.address, pvmw.pte, entry); + set_pte_at_replicated(mm, pvmw.address, pvmw.pte, entry); goto out_unlock; } /* See folio_try_share_anon_rmap_pte(): clear PTE first. */ if (anon_exclusive && folio_try_share_anon_rmap_pte(page_folio(page), page)) { - set_pte_at(mm, pvmw.address, pvmw.pte, entry); + set_pte_at_replicated(mm, pvmw.address, pvmw.pte, entry); goto out_unlock; } @@ -1162,7 +1163,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, if (pte_write(entry)) entry = pte_wrprotect(entry); - set_pte_at_notify(mm, pvmw.address, pvmw.pte, entry); + set_pte_at_notify_replicated(mm, pvmw.address, pvmw.pte, entry); } *orig_pte = entry; err = 0; @@ -1263,8 +1264,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, * * See Documentation/mm/mmu_notifier.rst */ - ptep_clear_flush(vma, addr, ptep); - set_pte_at_notify(mm, addr, ptep, newpte); + ptep_clear_flush_replicated(vma, addr, ptep); + set_pte_at_notify_replicated(mm, addr, ptep, newpte); add_reliable_page_counter(page, mm, -1); folio = page_folio(page); @@ -2392,7 +2393,7 @@ static struct ksm_rmap_item *scan_get_next_rmap_item(struct page **page) continue; if (ksm_scan.address < vma->vm_start) ksm_scan.address = vma->vm_start; - if (!vma->anon_vma) + if (!vma->anon_vma || vma_has_replicas(vma)) ksm_scan.address = vma->vm_end; while (ksm_scan.address < vma->vm_end) { diff --git a/mm/madvise.c b/mm/madvise.c index e51c1cf8dfca1..c4938a02804fc 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -31,6 +31,7 @@ #include <linux/swapops.h> #include <linux/shmem_fs.h> #include <linux/mmu_notifier.h> +#include <linux/numa_user_replication.h> #include <asm/tlb.h> @@ -503,6 +504,12 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, folio = vm_normal_folio(vma, addr, ptent); if (!folio || folio_is_zone_device(folio)) continue; + /* + * We do not care about replicated pages here, + * they are unevictable and invisible for reclaim anyway + */ + if (folio_test_replicated(folio)) + continue; /* * If we encounter a large folio, only split it if it is not @@ -560,7 +567,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, continue; if (!pageout && pte_young(ptent)) { - clear_young_dirty_ptes(vma, addr, pte, nr, + clear_young_dirty_ptes_replicated(vma, addr, pte, nr, CYDP_CLEAR_YOUNG); tlb_remove_tlb_entries(tlb, pte, nr, addr); } @@ -724,10 +731,10 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr, nr = swap_pte_batch(pte, max_nr, ptent); nr_swap -= nr; free_swap_and_cache_nr(entry, nr); - clear_not_present_full_ptes(mm, addr, pte, nr, tlb->fullmm); + clear_not_present_full_ptes_replicated(mm, addr, pte, nr, tlb->fullmm); } else if (is_hwpoison_entry(entry) || is_poisoned_swp_entry(entry)) { - pte_clear_not_present_full(mm, addr, pte, tlb->fullmm); + pte_clear_not_present_full_replicated(mm, addr, pte, tlb->fullmm); } continue; } @@ -735,7 +742,8 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr, folio = vm_normal_folio(vma, addr, ptent); if (!folio || folio_is_zone_device(folio)) continue; - + if (folio_test_replicated(folio)) + continue; /* * If we encounter a large folio, only split it if it is not * fully mapped within the range we are operating on. Otherwise @@ -803,7 +811,7 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr, } if (pte_young(ptent) || pte_dirty(ptent)) { - clear_young_dirty_ptes(vma, addr, pte, nr, cydp_flags); + clear_young_dirty_ptes_replicated(vma, addr, pte, nr, cydp_flags); tlb_remove_tlb_entries(tlb, pte, nr, addr); } folio_mark_lazyfree(folio); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 606a481afe2e2..786e7c9e83dd8 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -68,6 +68,7 @@ #include <linux/sched/isolation.h> #include <linux/parser.h> #include <linux/dynamic_pool.h> +#include <linux/numa_user_replication.h> #ifdef CONFIG_MEMCG_SWAP_QOS #include <linux/blkdev.h> @@ -207,6 +208,9 @@ static struct move_charge_struct { struct mm_struct *mm; struct mem_cgroup *from; struct mem_cgroup *to; +#ifdef CONFIG_USER_REPLICATION + struct mem_cgroup *to_repl; +#endif unsigned long flags; unsigned long precharge; unsigned long moved_charge; @@ -4209,6 +4213,11 @@ static int mem_cgroup_move_charge_write(struct cgroup_subsys_state *css, if (val & ~MOVE_MASK) return -EINVAL; +#ifdef CONFIG_USER_REPLICATION + if (memcg->user_replication_active) + return -EINVAL; +#endif + /* * No kind of locking is needed in here, because ->can_attach() will * check this value once in the beginning of the process, and then carry @@ -6125,6 +6134,46 @@ static ssize_t wb_blkio_write(struct kernfs_open_file *of, char *buf, } #endif +#ifdef CONFIG_USER_REPLICATION +static int memory_numa_replication_show(struct seq_file *m, void *v) +{ + struct mem_cgroup *memcg = mem_cgroup_from_seq(m); + int replication_mode = READ_ONCE(memcg->user_replication_active); + + if (replication_mode) { + seq_printf(m, "enabled\n"); + } else { + seq_printf(m, "disabled\n"); + } + + return 0; +} + +static ssize_t memory_numa_replication_write(struct kernfs_open_file *of, char *buf, + size_t nbytes, loff_t off) +{ + struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); + struct cgroup *cgrp = of_css(of)->cgroup; + + buf = strstrip(buf); + if (!buf) + return -EINVAL; + + if (cgroup_has_tasks(cgrp) || !is_text_replicated()) + return -EINVAL; + + if (!strcmp(buf, "enable")) { + WRITE_ONCE(memcg->move_charge_at_immigrate, MOVE_MASK); + WRITE_ONCE(memcg->user_replication_active, true); + } else if (!strcmp(buf, "disable")) { + WRITE_ONCE(memcg->user_replication_active, false); + } else { + return -EINVAL; + } + + return nbytes; +} +#endif static struct cftype mem_cgroup_legacy_files[] = { { @@ -6363,6 +6412,14 @@ static struct cftype mem_cgroup_legacy_files[] = { .write = mem_cgroup_dpool_2M_write, .flags = CFTYPE_NO_PREFIX | CFTYPE_WORLD_WRITABLE | CFTYPE_NOT_ON_ROOT, }, +#endif +#ifdef CONFIG_USER_REPLICATION + { + .name = "numa_replication", + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = memory_numa_replication_show, + .write = memory_numa_replication_write, + }, #endif { }, /* terminate */ }; @@ -6616,6 +6673,9 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) #endif #ifdef CONFIG_MEMCG_V1_RECLAIM memcg->high_async_ratio = HIGH_ASYNC_RATIO_BASE; +#endif +#ifdef CONFIG_USER_REPLICATION + memcg->user_replication_active = false; #endif page_counter_set_high(&memcg->swap, PAGE_COUNTER_MAX); if (parent) { @@ -7386,12 +7446,29 @@ static void mem_cgroup_clear_mc(void) spin_lock(&mc.lock); mc.from = NULL; mc.to = NULL; +#ifdef CONFIG_USER_REPLICATION + mc.to_repl = NULL; +#endif mc.mm = NULL; spin_unlock(&mc.lock); mmput(mm); } +#ifdef CONFIG_USER_REPLICATION +static void mem_cgroup_clear_mc_replicated(void) +{ + struct mm_struct *mm = mc.mm; + + spin_lock(&mc.lock); + mc.to_repl = NULL; + mc.mm = NULL; + spin_unlock(&mc.lock); + + mmput(mm); +} +#endif + static int mem_cgroup_can_attach(struct cgroup_taskset *tset) { struct cgroup_subsys_state *css; @@ -7401,10 +7478,14 @@ static int mem_cgroup_can_attach(struct cgroup_taskset *tset) struct mm_struct *mm; unsigned long move_flags; int ret = 0; - +#ifdef CONFIG_USER_REPLICATION + /* charge immigration isn't supported on the default hierarchy */ + bool bother_charge = !cgroup_subsys_on_dfl(memory_cgrp_subsys); +#else /* charge immigration isn't supported on the default hierarchy */ if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) return 0; +#endif /* * Multi-process migrations only happen on the default hierarchy @@ -7431,8 +7512,13 @@ static int mem_cgroup_can_attach(struct cgroup_taskset *tset) * So we need to save it, and keep it going. */ move_flags = READ_ONCE(memcg->move_charge_at_immigrate); +#ifdef CONFIG_USER_REPLICATION + if (bother_charge) + bother_charge = !!(move_flags); +#else if (!move_flags) return 0; +#endif from = mem_cgroup_from_task(p); @@ -7441,6 +7527,35 @@ static int mem_cgroup_can_attach(struct cgroup_taskset *tset) mm = get_task_mm(p); if (!mm) return 0; +#ifdef CONFIG_USER_REPLICATION + if (mm->owner == p) { + VM_BUG_ON(mc.to_repl); + if (bother_charge) { + VM_BUG_ON(mc.from); + VM_BUG_ON(mc.to); + VM_BUG_ON(mc.precharge); + VM_BUG_ON(mc.moved_charge); + VM_BUG_ON(mc.moved_swap); + } + + spin_lock(&mc.lock); + mc.mm = mm; + mc.to_repl = memcg; + if (bother_charge) { + mc.from = from; + mc.to = memcg; + mc.flags = move_flags; + /* We set mc.moving_task later */ + } + spin_unlock(&mc.lock); + + if (bother_charge) { + ret = mem_cgroup_precharge_mc(mm); + if (ret) + mem_cgroup_clear_mc(); + } + } +#else /* We move charges only when we move a owner of the mm */ if (mm->owner == p) { VM_BUG_ON(mc.from); @@ -7460,7 +7575,9 @@ static int mem_cgroup_can_attach(struct cgroup_taskset *tset) ret = mem_cgroup_precharge_mc(mm); if (ret) mem_cgroup_clear_mc(); - } else { + } +#endif + else { mmput(mm); } return ret; @@ -7470,6 +7587,10 @@ static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset) { if (mc.to) mem_cgroup_clear_mc(); +#ifdef CONFIG_USER_REPLICATION + else if (mc.to_repl) + mem_cgroup_clear_mc_replicated(); +#endif } static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, @@ -7628,9 +7749,21 @@ static void mem_cgroup_move_charge(void) static void mem_cgroup_move_task(void) { if (mc.to) { +#ifdef CONFIG_USER_REPLICATION + BUG_ON(mc.to_repl != mc.to); + numa_mm_handle_replication(mc.mm, + mc.to_repl->user_replication_active, FORK_KEEP_REPLICA); +#endif mem_cgroup_move_charge(); mem_cgroup_clear_mc(); } +#ifdef CONFIG_USER_REPLICATION + else if (mc.to_repl) { + numa_mm_handle_replication(mc.mm, + mc.to_repl->user_replication_active, FORK_KEEP_REPLICA); + mem_cgroup_clear_mc_replicated(); + } +#endif } #else /* !CONFIG_MMU */ diff --git a/mm/memory.c b/mm/memory.c index f05772babfe08..d317873a0dc46 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -79,7 +79,7 @@ #include <linux/sched/sysctl.h> #include <linux/userswap.h> #include <linux/dynamic_pool.h> -#include <linux/numa_kernel_replication.h> +#include <linux/numa_user_replication.h> #include <trace/events/kmem.h> @@ -187,142 +187,232 @@ void mm_trace_rss_stat(struct mm_struct *mm, int member) } #ifdef CONFIG_KERNEL_REPLICATION +#ifdef CONFIG_USER_REPLICATION -static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, - unsigned long addr) +static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, unsigned long addr) { unsigned long offset; - int nid; + struct ptdesc *curr, *tmp; + pmd_t *curr_pmd; + pte_t *curr_pte; + pgtable_t token = pmd_pgtable(*pmd); + bool pmd_replicated = numa_pgtable_replicated(pmd); + bool pte_replicated = numa_pgtable_replicated(page_to_virt(token)); + + pmd_clear(pmd); + if (pmd_replicated) + for_each_pgtable_replica(curr, curr_pmd, pmd, offset) { + pmd_clear(curr_pmd); + } + + if (pte_replicated) { + for_each_pgtable_replica_safe(curr, tmp, curr_pte, page_to_virt(token), offset) { + cleanup_pte_list(ptdesc_page(curr)); + pte_free_tlb(tlb, ptdesc_page(curr), addr); + mm_dec_nr_ptes(tlb->mm); + } + } + cleanup_pte_list(token); + pte_free_tlb(tlb, token, addr); + mm_dec_nr_ptes(tlb->mm); +} + +static void __free_pmd_range(struct mmu_gather *tlb, pud_t *pud, unsigned long addr) +{ + unsigned long offset; + struct ptdesc *curr, *tmp; + pud_t *curr_pud; + pmd_t *curr_pmd; + pmd_t *pmd = pmd_offset(pud, addr); + bool pud_replicated = numa_pgtable_replicated(pud); + bool pmd_replicated = numa_pgtable_replicated(pmd); + + pud_clear(pud); + if (pud_replicated) + for_each_pgtable_replica(curr, curr_pud, pud, offset) { + pud_clear(curr_pud); + } + + if (pmd_replicated) { + for_each_pgtable_replica_safe(curr, tmp, curr_pmd, pmd, offset) { + cleanup_pmd_list(curr); + pmd_free_tlb(tlb, curr_pmd, addr); + mm_dec_nr_pmds(tlb->mm); + } + } + cleanup_pmd_list(virt_to_ptdesc(pmd)); + pmd_free_tlb(tlb, pmd, addr); + mm_dec_nr_pmds(tlb->mm); +} + +static inline void __free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, unsigned long addr) +{ + unsigned long offset; + struct ptdesc *curr, *tmp; + p4d_t *curr_p4d; + pud_t *curr_pud; + pud_t *pud = pud_offset(p4d, addr); + bool p4d_replicated = numa_pgtable_replicated(p4d); + bool pud_replicated = numa_pgtable_replicated(pud); + + p4d_clear(p4d); + if (p4d_replicated) + for_each_pgtable_replica(curr, curr_p4d, p4d, offset) { + p4d_clear(curr_p4d); + } + + if (pud_replicated) { + for_each_pgtable_replica_safe(curr, tmp, curr_pud, pud, offset) { + cleanup_pud_list(curr); + pud_free_tlb(tlb, curr_pud, addr); + mm_dec_nr_puds(tlb->mm); + } + } + cleanup_pud_list(virt_to_ptdesc(pud)); + pud_free_tlb(tlb, pud, addr); + mm_dec_nr_puds(tlb->mm); +} + +static inline void __free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd, unsigned long addr) +{ + unsigned long offset; + struct ptdesc *curr, *tmp; + pgd_t *curr_pgd; + p4d_t *curr_p4d; + p4d_t *p4d = p4d_offset(pgd, addr); + bool pgd_replicated = numa_pgtable_replicated(pgd); + bool p4d_replicated = numa_pgtable_replicated(p4d); + + pgd_clear(pgd); + if (pgd_replicated) + for_each_pgtable_replica(curr, curr_pgd, pgd, offset) { + pgd_clear(curr_pgd); + } + + if (p4d_replicated) { + for_each_pgtable_replica_safe(curr, tmp, curr_p4d, p4d, offset) { + cleanup_p4d_list(curr); + p4d_free_tlb(tlb, curr_p4d, addr); + } + } + cleanup_p4d_list(virt_to_ptdesc(p4d)); + p4d_free_tlb(tlb, p4d, addr); +} + +#else + +static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, unsigned long addr) +{ + unsigned long offset; + struct ptdesc *curr; pmd_t *curr_pmd; pgtable_t token = pmd_pgtable(*pmd); + pmd_clear(pmd); if (get_propagation_level() == PMD_PROPAGATION) { - for_each_pgtable_replica(pmd, tlb->mm, curr_pmd, nid, offset) { + for_each_pgtable_replica(curr, curr_pmd, pmd, offset) { pmd_clear(curr_pmd); } - } else { - pmd_clear(pmd); } pte_free_tlb(tlb, token, addr); mm_dec_nr_ptes(tlb->mm); - (void)token; } -static inline void __free_pmd_range(struct mmu_gather *tlb, pud_t *pud, - unsigned long addr) +static inline void __free_pmd_range(struct mmu_gather *tlb, pud_t *pud, unsigned long addr) { unsigned long offset; - int nid; + struct ptdesc *curr; pud_t *curr_pud; pmd_t *pmd = pmd_offset(pud, addr); + pud_clear(pud); if (get_propagation_level() == PUD_PROPAGATION) { - for_each_pgtable_replica(pud, tlb->mm, curr_pud, nid, offset) { + for_each_pgtable_replica(curr, curr_pud, pud, offset) { pud_clear(curr_pud); } - } else { - pud_clear(pud); } pmd_free_tlb(tlb, pmd, addr); mm_dec_nr_pmds(tlb->mm); - (void)pmd; } -static inline void __free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, - unsigned long addr) +static inline void __free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, unsigned long addr) { unsigned long offset; - int nid; + struct ptdesc *curr; p4d_t *curr_p4d; pud_t *pud = pud_offset(p4d, addr); + p4d_clear(p4d); if (get_propagation_level() == P4D_PROPAGATION) { - for_each_pgtable_replica(p4d, tlb->mm, curr_p4d, nid, offset) { + for_each_pgtable_replica(curr, curr_p4d, p4d, offset) { p4d_clear(curr_p4d); } - } else { - p4d_clear(p4d); } pud_free_tlb(tlb, pud, addr); mm_dec_nr_puds(tlb->mm); - (void)pud; } -static inline void __free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd, - unsigned long addr) +static inline void __free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd, unsigned long addr) { unsigned long offset; - int nid; + struct ptdesc *curr; pgd_t *curr_pgd; - p4d_t *p4d = p4d_offset(pgd, addr); + p4d_t *p4d = p4d_offset(pgd, addr); + pgd_clear(pgd); if (get_propagation_level() == PGD_PROPAGATION) { - for_each_pgtable_replica(pgd, tlb->mm, curr_pgd, nid, offset) { + for_each_pgtable_replica(curr, curr_pgd, pgd, offset) { pgd_clear(curr_pgd); } - } else { - pgd_clear(pgd); } + p4d_free_tlb(tlb, p4d, addr); - /* - * Why? If 4-level paging is enabled via kconfig, - * all functions execept p4d_offset are empty, - * and we get unused variable error - */ - (void)p4d; + (void) p4d; } -#else + +#endif /* CONFIG_USER_REPLICATION */ + +#else /* !CONFIG_KERNEL_REPLICATION */ /* * Note: this doesn't free the actual pages themselves. That * has been handled earlier when unmapping all the memory regions. */ -static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, - unsigned long addr) +static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, unsigned long addr) { pgtable_t token = pmd_pgtable(*pmd); pmd_clear(pmd); pte_free_tlb(tlb, token, addr); mm_dec_nr_ptes(tlb->mm); - (void)token; } -static void __free_pmd_range(struct mmu_gather *tlb, pud_t *pud, - unsigned long addr) +static void __free_pmd_range(struct mmu_gather *tlb, pud_t *pud, unsigned long addr) { pmd_t *pmd = pmd_offset(pud, addr); - pud_clear(pud); pmd_free_tlb(tlb, pmd, addr); mm_dec_nr_pmds(tlb->mm); - (void)pmd; } -static inline void __free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, - unsigned long addr) +static inline void __free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, unsigned long addr) { pud_t *pud = pud_offset(p4d, addr); - p4d_clear(p4d); pud_free_tlb(tlb, pud, addr); mm_dec_nr_puds(tlb->mm); - (void)pud; } -static inline void __free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd, - unsigned long addr) +static inline void __free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd, unsigned long addr) { p4d_t *p4d = p4d_offset(pgd, addr); - pgd_clear(pgd); p4d_free_tlb(tlb, p4d, addr); - (void)p4d; } -#endif +#endif /* CONFIG_KERNEL_REPLICATION */ static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud, unsigned long addr, unsigned long end, @@ -518,9 +608,12 @@ void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, /* * Optimization: gather nearby vmas into one call down + * We are able to optimize into one call only if all of them are replicated, + * or all of them are not */ while (next && next->vm_start <= vma->vm_end + PMD_SIZE - && !is_vm_hugetlb_page(next)) { + && !is_vm_hugetlb_page(next) + && (numa_is_vma_replicant(vma) == numa_is_vma_replicant(next))) { vma = next; next = mas_find(mas, ceiling - 1); if (unlikely(xa_is_zero(next))) @@ -871,7 +964,7 @@ static void restore_exclusive_pte(struct vm_area_struct *vma, */ WARN_ON_ONCE(1); - set_pte_at(vma->vm_mm, address, ptep, pte); + set_pte_at_replicated(vma->vm_mm, address, ptep, pte); /* * No need to invalidate - it was non-present before. However @@ -933,11 +1026,12 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, /* Mark the swap entry as shared. */ if (pte_swp_exclusive(orig_pte)) { pte = pte_swp_clear_exclusive(orig_pte); - set_pte_at(src_mm, addr, src_pte, pte); + set_pte_at_replicated(src_mm, addr, src_pte, pte); } rss[MM_SWAPENTS]++; } else if (is_migration_entry(entry)) { folio = pfn_swap_entry_folio(entry); + BUG_ON(folio_test_replicated(folio)); rss[mm_counter(folio)]++; @@ -955,11 +1049,12 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, pte = pte_swp_mksoft_dirty(pte); if (pte_swp_uffd_wp(orig_pte)) pte = pte_swp_mkuffd_wp(pte); - set_pte_at(src_mm, addr, src_pte, pte); + set_pte_at_replicated(src_mm, addr, src_pte, pte); } } else if (is_device_private_entry(entry)) { page = pfn_swap_entry_to_page(entry); folio = page_folio(page); + BUG_ON(folio_test_replicated(folio)); /* * Update rss count even for unaddressable pages, as @@ -989,7 +1084,7 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, pte = swp_entry_to_pte(entry); if (pte_swp_uffd_wp(orig_pte)) pte = pte_swp_mkuffd_wp(pte); - set_pte_at(src_mm, addr, src_pte, pte); + set_pte_at_replicated(src_mm, addr, src_pte, pte); } } else if (is_device_exclusive_entry(entry)) { /* @@ -1006,13 +1101,13 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, pte_marker marker = copy_pte_marker(entry, dst_vma); if (marker) - set_pte_at(dst_mm, addr, dst_pte, + set_pte_at_replicated(dst_mm, addr, dst_pte, make_pte_marker(marker)); return 0; } if (!userfaultfd_wp(dst_vma)) pte = pte_swp_clear_uffd_wp(pte); - set_pte_at(dst_mm, addr, dst_pte, pte); + set_pte_at_replicated(dst_mm, addr, dst_pte, pte); return 0; } @@ -1060,7 +1155,7 @@ copy_present_page(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma if (userfaultfd_pte_wp(dst_vma, ptep_get(src_pte))) /* Uffd-wp needs to be delivered to dest pte as well */ pte = pte_mkuffd_wp(pte); - set_pte_at(dst_vma->vm_mm, addr, dst_pte, pte); + set_pte_at_replicated(dst_vma->vm_mm, addr, dst_pte, pte); return 0; } @@ -1072,7 +1167,7 @@ static __always_inline void __copy_present_ptes(struct vm_area_struct *dst_vma, /* If it's a COW mapping, write protect it both processes. */ if (is_cow_mapping(src_vma->vm_flags) && pte_write(pte)) { - wrprotect_ptes(src_mm, addr, src_pte, nr); + wrprotect_ptes_replicated(src_mm, addr, src_pte, nr); pte = pte_wrprotect(pte); } @@ -1084,9 +1179,31 @@ static __always_inline void __copy_present_ptes(struct vm_area_struct *dst_vma, if (!userfaultfd_wp(dst_vma)) pte = pte_clear_uffd_wp(pte); - set_ptes(dst_vma->vm_mm, addr, dst_pte, pte, nr); + set_ptes_replicated(dst_vma->vm_mm, addr, dst_pte, pte, nr); } +#ifdef CONFIG_USER_REPLICATION +static __always_inline void __copy_present_ptes_replicated(struct vm_area_struct *dst_vma, + struct vm_area_struct *src_vma, pte_t *dst_pte, pte_t *src_pte, + pte_t pte, pte_t *pte_numa, unsigned long addr) +{ + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_pte; + bool start; + int nid; + + BUG_ON(is_cow_mapping(src_vma->vm_flags) && pte_write(pte)); + BUG_ON(src_vma->vm_flags & VM_SHARED); + + for_each_memory_node(nid) + pte_numa[nid] = pte_mkold(pte_numa[nid]); + + for_each_pgtable(curr, curr_pte, dst_pte, nid, offset, start) + set_pte_at(dst_vma->vm_mm, addr, curr_pte, pte_numa[nid]); +} +#endif + /* * Copy one present PTE, trying to batch-process subsequent PTEs that map * consecutive pages of the same folio by copying them as well. @@ -1110,6 +1227,36 @@ copy_present_ptes(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma goto copy_pte; folio = page_folio(page); + BUG_ON(folio_test_replicated(folio) && folio_test_large(folio)); + +#ifdef CONFIG_USER_REPLICATION + if (folio_test_replicated(folio)) { + pte_t pte_numa[MAX_NUMNODES]; + unsigned long offset; + bool start; + struct ptdesc *curr; + pte_t *curr_pte; + int nid; + + if (!memcg_replication_enabled(dst_vma->vm_mm)) { + err = copy_present_page(dst_vma, src_vma, dst_pte, src_pte, + addr, rss, prealloc, page); + return err ? err : 1; + } + + for_each_pgtable(curr, curr_pte, src_pte, nid, offset, start) { + pte_numa[nid] = ptep_get(curr_pte); + struct page *curr_page = vm_normal_page(src_vma, addr, pte_numa[nid]); + get_page(curr_page); + rss[MM_ANONPAGES]++; + add_reliable_page_counter(curr_page, dst_vma->vm_mm, 1); + } + + __copy_present_ptes_replicated(dst_vma, src_vma, dst_pte, src_pte, + pte, pte_numa, addr); + return 1; + } +#endif /* * If we likely have to copy, just don't bother with batching. Make @@ -1224,7 +1371,7 @@ copy_pte_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, * (whereas vma_needs_copy() skips areas without anon_vma). A rework * can remove such assumptions later, but this is good enough for now. */ - dst_pte = pte_alloc_map_lock(dst_mm, dst_pmd, addr, &dst_ptl); + dst_pte = cpr_alloc_pte_map_lock(dst_mm, addr, src_pmd, dst_pmd, &dst_ptl); if (!dst_pte) { ret = -ENOMEM; goto out; @@ -1351,7 +1498,7 @@ copy_pmd_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, pmd_t *src_pmd, *dst_pmd; unsigned long next; - dst_pmd = pmd_alloc(dst_mm, dst_pud, addr); + dst_pmd = cpr_alloc_pmd(dst_mm, addr, src_pud, dst_pud); if (!dst_pmd) return -ENOMEM; src_pmd = pmd_offset(src_pud, addr); @@ -1388,7 +1535,7 @@ copy_pud_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, pud_t *src_pud, *dst_pud; unsigned long next; - dst_pud = pud_alloc(dst_mm, dst_p4d, addr); + dst_pud = cpr_alloc_pud(dst_mm, addr, src_p4d, dst_p4d); if (!dst_pud) return -ENOMEM; src_pud = pud_offset(src_p4d, addr); @@ -1424,7 +1571,7 @@ copy_p4d_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, p4d_t *src_p4d, *dst_p4d; unsigned long next; - dst_p4d = p4d_alloc(dst_mm, dst_pgd, addr); + dst_p4d = cpr_alloc_p4d(dst_mm, addr, src_pgd, dst_pgd); if (!dst_p4d) return -ENOMEM; src_p4d = p4d_offset(src_pgd, addr); @@ -1603,29 +1750,52 @@ zap_install_uffd_wp_if_needed(struct vm_area_struct *vma, } static __always_inline void zap_present_folio_ptes(struct mmu_gather *tlb, - struct vm_area_struct *vma, struct folio *folio, - struct page *page, pte_t *pte, pte_t ptent, unsigned int nr, + struct vm_area_struct *vma, struct folio *folio, struct page *page, + struct pgtable_private *ptes, pte_t *pte, pte_t ptent, unsigned int nr, unsigned long addr, struct zap_details *details, int *rss, bool *force_flush, bool *force_break) { struct mm_struct *mm = tlb->mm; bool delay_rmap = false; + int nid; if (!folio_test_anon(folio)) { - ptent = get_and_clear_full_ptes(mm, addr, pte, nr, tlb->fullmm); - if (pte_dirty(ptent)) { - folio_mark_dirty(folio); - if (tlb_delay_rmap(tlb)) { - delay_rmap = true; - *force_flush = true; + if (ptes->pte_replicated) { + for_each_memory_node(nid) { + pte = ptes->pte_numa[nid]; + ptent = get_and_clear_full_ptes(mm, addr, pte, nr, tlb->fullmm); + if (pte_dirty(ptent)) { + folio_mark_dirty(folio); + if (tlb_delay_rmap(tlb)) { + delay_rmap = true; + *force_flush = true; + } + } + if (pte_young(ptent) && likely(vma_has_recency(vma))) { + folio_mark_accessed(folio); + } + } + } else { + ptent = get_and_clear_full_ptes(mm, addr, pte, nr, tlb->fullmm); + if (pte_dirty(ptent)) { + folio_mark_dirty(folio); + if (tlb_delay_rmap(tlb)) { + delay_rmap = true; + *force_flush = true; + } } + if (pte_young(ptent) && likely(vma_has_recency(vma))) + folio_mark_accessed(folio); } - if (pte_young(ptent) && likely(vma_has_recency(vma))) - folio_mark_accessed(folio); rss[mm_counter(folio)] -= nr; } else { /* We don't need up-to-date accessed/dirty bits. */ - clear_full_ptes(mm, addr, pte, nr, tlb->fullmm); + if (ptes->pte_replicated) { + for_each_memory_node(nid) + clear_full_ptes(mm, addr, ptes->pte_numa[nid], nr, tlb->fullmm); + } else { + clear_full_ptes(mm, addr, pte, nr, tlb->fullmm); + } rss[MM_ANONPAGES] -= nr; } add_reliable_folio_counter(folio, mm, -nr); @@ -1650,13 +1820,47 @@ static __always_inline void zap_present_folio_ptes(struct mmu_gather *tlb, } } +#ifdef CONFIG_USER_REPLICATION +static __always_inline void zap_present_folio_ptes_replicated(struct mmu_gather *tlb, + struct vm_area_struct *vma, struct pgtable_private *ptes, + pte_t *pte, pte_t ptent, unsigned long addr, + struct zap_details *details, int *rss, + bool *force_flush, bool *force_break) +{ + struct mm_struct *mm = tlb->mm; + int nid; + + for_each_memory_node(nid) { + pte = ptes->pte_numa[nid]; + ptent = ptep_get(pte); + ptes->replica_pages[nid] = vm_normal_page(vma, addr, ptent); + + /* We don't need up-to-date accesses/dirty bits. */ + clear_full_ptes(mm, addr, pte, 1, tlb->fullmm); + rss[MM_ANONPAGES]--; + add_reliable_page_counter(ptes->replica_pages[nid], mm, -1); + } + + /* Checking a single PTE in a batch is sufficient. */ + arch_check_zapped_pte(vma, ptent); + tlb_remove_tlb_entry(tlb, pte, addr); + if (unlikely(userfaultfd_pte_wp(vma, ptent))) + zap_install_uffd_wp_if_needed(vma, addr, pte, 1, details, ptent); + + if (unlikely(__tlb_remove_replica_pages(tlb, ptes->replica_pages))) { + *force_flush = true; + *force_break = true; + } +} +#endif + /* * Zap or skip at least one present PTE, trying to batch-process subsequent * PTEs that map consecutive pages of the same folio. * * Returns the number of processed (skipped or zapped) PTEs (at least 1). */ -static inline int zap_present_ptes(struct mmu_gather *tlb, +static inline int zap_present_ptes(struct mmu_gather *tlb, struct pgtable_private *ptes, struct vm_area_struct *vma, pte_t *pte, pte_t ptent, unsigned int max_nr, unsigned long addr, struct zap_details *details, int *rss, bool *force_flush, @@ -1670,8 +1874,14 @@ static inline int zap_present_ptes(struct mmu_gather *tlb, page = vm_normal_page(vma, addr, ptent); if (!page) { + int nid; /* We don't need up-to-date accessed/dirty bits. */ - ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm); + if (ptes->pte_replicated) { + for_each_memory_node(nid) + ptep_get_and_clear_full(mm, addr, ptes->pte_numa[nid], tlb->fullmm); + } else { + ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm); + } arch_check_zapped_pte(vma, ptent); tlb_remove_tlb_entry(tlb, pte, addr); if (userfaultfd_pte_wp(vma, ptent)) @@ -1685,6 +1895,16 @@ static inline int zap_present_ptes(struct mmu_gather *tlb, if (unlikely(!should_zap_folio(details, folio))) return 1; +#ifdef CONFIG_USER_REPLICATION + if (folio_test_replicated(folio)) { + BUG_ON(!ptes->pte_replicated); + + zap_present_folio_ptes_replicated(tlb, vma, ptes, pte, ptent, addr, + details, rss, force_flush, force_break); + return 1; + } +#endif + /* * Make sure that the common "small folio" case is as fast as possible * by keeping the batching logic separate. @@ -1693,12 +1913,12 @@ static inline int zap_present_ptes(struct mmu_gather *tlb, nr = folio_pte_batch(folio, addr, pte, ptent, max_nr, fpb_flags, NULL, NULL, NULL); - zap_present_folio_ptes(tlb, vma, folio, page, pte, ptent, nr, + zap_present_folio_ptes(tlb, vma, folio, page, ptes, pte, ptent, nr, addr, details, rss, force_flush, force_break); return nr; } - zap_present_folio_ptes(tlb, vma, folio, page, pte, ptent, 1, addr, + zap_present_folio_ptes(tlb, vma, folio, page, ptes, pte, ptent, 1, addr, details, rss, force_flush, force_break); return 1; } @@ -1710,6 +1930,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, { bool force_flush = false, force_break = false; struct mm_struct *mm = tlb->mm; + struct pgtable_private ptes; int rss[NR_MM_COUNTERS]; spinlock_t *ptl; pte_t *start_pte; @@ -1722,6 +1943,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, start_pte = pte = pte_offset_map_lock(mm, pmd, addr, &ptl); if (!pte) return addr; + pgtable_update_pte(&ptes, pte); flush_tlb_batched_pending(mm); arch_enter_lazy_mmu_mode(); @@ -1730,6 +1952,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, struct folio *folio; struct page *page; int max_nr; + int nid; nr = 1; if (pte_none(ptent)) @@ -1740,7 +1963,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, if (pte_present(ptent)) { max_nr = (end - addr) / PAGE_SIZE; - nr = zap_present_ptes(tlb, vma, pte, ptent, max_nr, + nr = zap_present_ptes(tlb, &ptes, vma, pte, ptent, max_nr, addr, details, rss, &force_flush, &force_break); if (unlikely(force_break)) { @@ -1755,6 +1978,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, is_device_exclusive_entry(entry)) { page = pfn_swap_entry_to_page(entry); folio = page_folio(page); + BUG_ON(folio_test_replicated(folio)); if (unlikely(!should_zap_folio(details, folio))) continue; /* @@ -1779,6 +2003,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, free_swap_and_cache_nr(entry, nr); } else if (is_migration_entry(entry)) { folio = pfn_swap_entry_folio(entry); + BUG_ON(folio_test_replicated(folio)); if (!should_zap_folio(details, folio)) continue; rss[mm_counter(folio)]--; @@ -1802,9 +2027,15 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, /* We should have covered all the swap entry types */ WARN_ON_ONCE(1); } - clear_not_present_full_ptes(mm, addr, pte, nr, tlb->fullmm); + + if (ptes.pte_replicated) { + for_each_memory_node(nid) + clear_not_present_full_ptes(mm, addr, ptes.pte_numa[nid], nr, tlb->fullmm); + } else { + clear_not_present_full_ptes(mm, addr, pte, nr, tlb->fullmm); + } zap_install_uffd_wp_if_needed(vma, addr, pte, nr, details, ptent); - } while (pte += nr, addr += PAGE_SIZE * nr, addr != end); + } while (pgtable_pte_step(&ptes, nr), pte += nr, addr += PAGE_SIZE * nr, addr != end); add_mm_rss_vec(mm, rss); arch_leave_lazy_mmu_mode(); @@ -2140,7 +2371,7 @@ static int insert_page_into_pte_locked(struct vm_area_struct *vma, pte_t *pte, folio_get(folio); inc_mm_counter(vma->vm_mm, mm_counter_file(folio)); folio_add_file_rmap_pte(folio, page, vma); - set_pte_at(vma->vm_mm, addr, pte, mk_pte(page, prot)); + set_pte_at_replicated(vma->vm_mm, addr, pte, mk_pte(page, prot)); return 0; } @@ -2432,7 +2663,7 @@ static vm_fault_t insert_pfn(struct vm_area_struct *vma, unsigned long addr, } entry = pte_mkyoung(entry); entry = maybe_mkwrite(pte_mkdirty(entry), vma); - if (ptep_set_access_flags(vma, addr, pte, entry, 1)) + if (ptep_set_access_flags_replicated(vma, addr, pte, entry, 1)) update_mmu_cache(vma, addr, pte); } goto out_unlock; @@ -2449,7 +2680,7 @@ static vm_fault_t insert_pfn(struct vm_area_struct *vma, unsigned long addr, entry = maybe_mkwrite(pte_mkdirty(entry), vma); } - set_pte_at(mm, addr, pte, entry); + set_pte_at_replicated(mm, addr, pte, entry); update_mmu_cache(vma, addr, pte); /* XXX: why not for insert_page? */ out_unlock: @@ -2647,7 +2878,7 @@ static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd, err = -EACCES; break; } - set_pte_at(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot))); + set_pte_at_replicated(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot))); pfn++; } while (pte++, addr += PAGE_SIZE, addr != end); arch_leave_lazy_mmu_mode(); @@ -3185,7 +3416,7 @@ static inline int __wp_page_copy_user(struct page *dst, struct page *src, } entry = pte_mkyoung(vmf->orig_pte); - if (ptep_set_access_flags(vma, addr, vmf->pte, entry, 0)) + if (ptep_set_access_flags_replicated(vma, addr, vmf->pte, entry, 0)) update_mmu_cache_range(vmf, vma, addr, vmf->pte, 1); } @@ -3363,7 +3594,7 @@ static inline void wp_page_reuse(struct vm_fault *vmf, struct folio *folio) flush_cache_page(vma, vmf->address, pte_pfn(vmf->orig_pte)); entry = pte_mkyoung(vmf->orig_pte); entry = maybe_mkwrite(pte_mkdirty(entry), vma); - if (ptep_set_access_flags(vma, vmf->address, vmf->pte, entry, 1)) + if (ptep_set_access_flags_replicated(vma, vmf->address, vmf->pte, entry, 1)) update_mmu_cache_range(vmf, vma, vmf->address, vmf->pte, 1); pte_unmap_unlock(vmf->pte, vmf->ptl); count_vm_event(PGREUSE); @@ -3527,7 +3758,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) * that left a window where the new PTE could be loaded into * some TLBs while the old PTE remains in others. */ - ptep_clear_flush(vma, vmf->address, vmf->pte); + ptep_clear_flush_replicated(vma, vmf->address, vmf->pte); folio_add_new_anon_rmap(new_folio, vma, vmf->address, RMAP_EXCLUSIVE); folio_add_lru_vma(new_folio, vma); /* @@ -3536,7 +3767,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) * new page to be mapped directly into the secondary page table. */ BUG_ON(unshare && pte_write(entry)); - set_pte_at_notify(mm, vmf->address, vmf->pte, entry); + set_pte_at_notify_replicated(mm, vmf->address, vmf->pte, entry); update_mmu_cache_range(vmf, vma, vmf->address, vmf->pte, 1); if (old_folio) { /* @@ -3792,8 +4023,10 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf) vmf->page = vm_normal_page(vma, vmf->address, vmf->orig_pte); - if (vmf->page) + if (vmf->page) { folio = page_folio(vmf->page); + BUG_ON(folio_test_replicated(folio)); + } /* * Shared mapping: we are guaranteed to have VM_WRITE and @@ -4051,7 +4284,7 @@ static vm_fault_t pte_marker_clear(struct vm_fault *vmf) * So is_pte_marker() check is not enough to safely drop the pte. */ if (pte_same(vmf->orig_pte, ptep_get(vmf->pte))) - pte_clear(vmf->vma->vm_mm, vmf->address, vmf->pte); + pte_clear_replicated(vmf->vma->vm_mm, vmf->address, vmf->pte); pte_unmap_unlock(vmf->pte, vmf->ptl); return 0; } @@ -4378,6 +4611,8 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) BUG_ON(!folio_test_anon(folio) && folio_test_mappedtodisk(folio)); BUG_ON(folio_test_anon(folio) && PageAnonExclusive(page)); + BUG_ON(folio_test_replicated(folio)); + /* * Check under PT lock (to protect against concurrent fork() sharing * the swap entry concurrently) for certainly exclusive pages. @@ -4481,7 +4716,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) VM_BUG_ON(!folio_test_anon(folio) || (pte_write(pte) && !PageAnonExclusive(page))); - set_ptes(vma->vm_mm, address, ptep, pte, nr_pages); + set_ptes_replicated(vma->vm_mm, address, ptep, pte, nr_pages); arch_do_swap_page_nr(vma->vm_mm, vma, address, pte, pte, nr_pages); @@ -4660,7 +4895,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf) /* Use the zero-page for reads */ if (!(vmf->flags & FAULT_FLAG_WRITE) && - !mm_forbids_zeropage(vma->vm_mm)) { + !mm_forbids_zeropage(vma->vm_mm) && !vma_has_replicas(vma)) { entry = pte_mkspecial(pfn_pte(my_zero_pfn(vmf->address), vma->vm_page_prot)); vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, @@ -4739,7 +4974,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf) setpte: if (vmf_orig_pte_uffd_wp(vmf)) entry = pte_mkuffd_wp(entry); - set_ptes(vma->vm_mm, addr, vmf->pte, entry, nr_pages); + set_ptes_replicated(vma->vm_mm, addr, vmf->pte, entry, nr_pages); /* No need to invalidate - it was non-present before */ update_mmu_cache_range(vmf, vma, addr, vmf->pte, nr_pages); @@ -4948,7 +5183,7 @@ void set_pte_range(struct vm_fault *vmf, struct folio *folio, } else { folio_add_file_rmap_ptes(folio, page, nr, vma); } - set_ptes(vma->vm_mm, addr, vmf->pte, entry, nr); + set_ptes_replicated(vma->vm_mm, addr, vmf->pte, entry, nr); /* no need to invalidate: a not-present page won't be cached */ update_mmu_cache_range(vmf, vma, addr, vmf->pte, nr); @@ -5004,6 +5239,8 @@ vm_fault_t finish_fault(struct vm_fault *vmf) return ret; } + BUG_ON(PageReplicated(page)); + if (pmd_none(*vmf->pmd)) { if (PageTransCompound(page)) { ret = do_set_pmd(vmf, page); @@ -5374,12 +5611,12 @@ static void numa_rebuild_single_mapping(struct vm_fault *vmf, struct vm_area_str { pte_t pte, old_pte; - old_pte = ptep_modify_prot_start(vma, fault_addr, fault_pte); + old_pte = ptep_modify_prot_start_replicated(vma, fault_addr, fault_pte); pte = pte_modify(old_pte, vma->vm_page_prot); pte = pte_mkyoung(pte); if (writable) pte = pte_mkwrite(pte, vma); - ptep_modify_prot_commit(vma, fault_addr, fault_pte, old_pte, pte); + ptep_modify_prot_commit_replicated(vma, fault_addr, fault_pte, old_pte, pte); update_mmu_cache_range(vmf, vma, fault_addr, fault_pte, 1); } @@ -5422,6 +5659,37 @@ static void numa_rebuild_large_mapping(struct vm_fault *vmf, struct vm_area_stru } } +#ifdef CONFIG_USER_REPLICATION +static int numa_replicate_page(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct mm_struct *mm = vmf->vma->vm_mm; + struct mmu_gather tlb; + unsigned long start = vmf->address & PAGE_MASK; + unsigned long end = start + PAGE_SIZE; + int ret = 1; + + /* + * This should not be possible, + * because we have just handled page fault up to pmd level, + * so pmd tables must exist and be replicated. + * In fact, even pte level tables must be replicated at this point. + */ + BUG_ON(pmd_none(*vmf->pmd) || !numa_pgtable_replicated(vmf->pmd)); + + tlb_gather_mmu(&tlb, mm); + tlb_start_vma(&tlb, vma); + + if (phys_duplicate_pte_range(&tlb, vma, vmf->pmd, start, end) != end) + ret = 0; + + tlb_end_vma(&tlb, vma); + tlb_finish_mmu(&tlb); + + return ret; +} +#endif + static vm_fault_t do_numa_page(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; @@ -5462,6 +5730,8 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) if (!folio || folio_is_zone_device(folio)) goto out_map; + BUG_ON(folio_test_replicated(folio)); + /* * Avoid grouping on RO pages in general. RO pages shouldn't hurt as * much anyway since they can be in shared cache state. This misses @@ -5491,14 +5761,48 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) else last_cpupid = folio_last_cpupid(folio); target_nid = numa_migrate_prep(folio, vma, vmf->address, nid, &flags); - if (target_nid == NUMA_NO_NODE) { + if (target_nid == NUMA_NO_NODE && !vma_has_replicas(vma)) { folio_put(folio); goto out_map; } + + if (vma_has_replicas(vma)) + BUG_ON(!numa_pgtable_replicated(vmf->pte)); + pte_unmap_unlock(vmf->pte, vmf->ptl); writable = false; ignore_writable = true; +#ifdef CONFIG_USER_REPLICATION + if (vma_has_replicas(vma)) { + /* Drop the reference count that was elevated in numa_migrate_prep() */ + folio_put(folio); + + if (numa_replicate_page(vmf)) { + vmf->replica_action = REPLICA_NONE; + if (target_nid != NUMA_NO_NODE) + nid = target_nid; + flags |= TNF_FAULT_LOCAL; + task_numa_fault(last_cpupid, nid, 1, flags); + return 0; + } + + /* + * Checking for spurious numa-fault. + * See kernel/sched/fair.c:task_numa_work() for the same if-statement. + */ + if (vma->vm_file && ((vma->vm_flags & (VM_READ|VM_WRITE)) == VM_READ)) { + /* do not task_numa_fault() in the end of function */ + nid = NUMA_NO_NODE; + goto out_unmap; + } + + if (target_nid == NUMA_NO_NODE) { + goto out_unmap; + } + } +#endif + /* Migrate to the requested node */ if (migrate_misplaced_folio(folio, vma, target_nid)) { nid = target_nid; @@ -5506,8 +5810,11 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) task_numa_fault(last_cpupid, nid, 1, flags); return 0; } - flags |= TNF_MIGRATE_FAIL; + +#ifdef CONFIG_USER_REPLICATION +out_unmap: +#endif vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address, &vmf->ptl); if (unlikely(!vmf->pte)) @@ -5680,7 +5987,7 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf) entry = pte_mkdirty(entry); } entry = pte_mkyoung(entry); - if (ptep_set_access_flags(vmf->vma, vmf->address, vmf->pte, entry, + if (ptep_set_access_flags_replicated(vmf->vma, vmf->address, vmf->pte, entry, vmf->flags & FAULT_FLAG_WRITE)) { update_mmu_cache_range(vmf, vmf->vma, vmf->address, vmf->pte, 1); @@ -5726,12 +6033,12 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, p4d_t *p4d; vm_fault_t ret; - pgd = pgd_offset(mm, address); - p4d = p4d_alloc(mm, pgd, address); + pgd = fault_pgd_offset(&vmf, address); + p4d = fault_p4d_alloc(&vmf, mm, pgd, address); if (!p4d) return VM_FAULT_OOM; - vmf.pud = pud_alloc(mm, p4d, address); + vmf.pud = fault_pud_alloc(&vmf, mm, p4d, address); if (!vmf.pud) return VM_FAULT_OOM; retry_pud: @@ -5763,7 +6070,7 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, } } - vmf.pmd = pmd_alloc(mm, vmf.pud, address); + vmf.pmd = fault_pmd_alloc(&vmf, mm, vmf.pud, address); if (!vmf.pmd) return VM_FAULT_OOM; @@ -5804,6 +6111,8 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, } } + if (fault_pte_alloc(&vmf)) + return VM_FAULT_OOM; return handle_pte_fault(&vmf); } @@ -6847,6 +7156,7 @@ void __init ptlock_cache_init(void) SLAB_PANIC, NULL); } +#ifdef CONFIG_KERNEL_REPLICATION bool ptlock_alloc(struct ptdesc *ptdesc) { spinlock_t *ptl; @@ -6855,13 +7165,33 @@ bool ptlock_alloc(struct ptdesc *ptdesc) if (!ptl) return false; ptdesc->ptl = ptl; + ptdesc->master_table = ptdesc; return true; } void ptlock_free(struct ptdesc *ptdesc) { kmem_cache_free(page_ptl_cachep, ptdesc->ptl); + ptdesc->master_table = NULL; } +#else +bool ptlock_alloc(struct ptdesc *ptdesc) +{ + spinlock_t *ptl; + + ptl = kmem_cache_alloc(page_ptl_cachep, GFP_KERNEL); + if (!ptl) + return false; + ptdesc->ptl = ptl; + return true; +} + +void ptlock_free(struct ptdesc *ptdesc) +{ + kmem_cache_free(page_ptl_cachep, ptdesc->ptl); +} +#endif + #endif /** diff --git a/mm/mempolicy.c b/mm/mempolicy.c index f4dfeb5f052f2..0b7f26c54b2df 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -540,6 +540,11 @@ static int queue_folios_pte_range(pmd_t *pmd, unsigned long addr, continue; if (!queue_folio_required(folio, qp)) continue; + /* + * If vma contains replicated memory, we are not going to move these pages. + */ + if (folio_test_replicated(folio)) + continue; if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { /* * MPOL_MF_STRICT must be specified if we get here. diff --git a/mm/migrate.c b/mm/migrate.c index 05538e2edd1b7..e1d88bdbab3cf 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -51,6 +51,7 @@ #include <linux/sched/sysctl.h> #include <linux/memory-tiers.h> #include <linux/dynamic_pool.h> +#include <linux/numa_user_replication.h> #include <asm/tlbflush.h> @@ -264,7 +265,7 @@ static bool remove_migration_pte(struct folio *folio, pvmw.address, rmap_flags); else folio_add_file_rmap_pte(folio, new, vma); - set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte); + set_pte_at_replicated(vma->vm_mm, pvmw.address, pvmw.pte, pte); } if (vma->vm_flags & VM_LOCKED) mlock_drain_local(); @@ -2157,7 +2158,8 @@ static int add_page_for_migration(struct mm_struct *mm, const void __user *p, err = -EFAULT; vma = vma_lookup(mm, addr); - if (!vma || !vma_migratable(vma)) + /* if page belongs to fully replicated vma, we don't want to move it here */ + if (!vma || !vma_migratable(vma) || vma_has_replicas(vma)) goto out; /* FOLL_DUMP to ignore special (like zero) pages */ @@ -2358,7 +2360,8 @@ static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages, int err = -EFAULT; vma = vma_lookup(mm, addr); - if (!vma) + /* Skip fully replicated vmas */ + if (!vma || vma_has_replicas(vma)) goto set_status; /* FOLL_DUMP to ignore special (like zero) pages */ @@ -2632,6 +2635,8 @@ int migrate_misplaced_folio(struct folio *folio, struct vm_area_struct *vma, unsigned int nr_succeeded; LIST_HEAD(migratepages); + BUG_ON(folio_test_replicated(folio)); + /* * Don't migrate file folios that are mapped in multiple processes * with execute permissions as they are probably shared libraries. diff --git a/mm/migrate_device.c b/mm/migrate_device.c index 58636163731af..d090ed9f73b4a 100644 --- a/mm/migrate_device.c +++ b/mm/migrate_device.c @@ -14,6 +14,7 @@ #include <linux/pagewalk.h> #include <linux/rmap.h> #include <linux/swapops.h> +#include <linux/numa_user_replication.h> #include <asm/tlbflush.h> #include "internal.h" @@ -200,17 +201,17 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp, anon_exclusive = folio_test_anon(folio) && PageAnonExclusive(page); if (anon_exclusive) { - pte = ptep_clear_flush(vma, addr, ptep); + pte = ptep_clear_flush_replicated(vma, addr, ptep); if (folio_try_share_anon_rmap_pte(folio, page)) { - set_pte_at(mm, addr, ptep, pte); + set_pte_at_replicated(mm, addr, ptep, pte); folio_unlock(folio); folio_put(folio); mpfn = 0; goto next; } } else { - pte = ptep_get_and_clear(mm, addr, ptep); + pte = ptep_get_and_clear_replicated(mm, addr, ptep); } migrate->cpages++; @@ -247,7 +248,7 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp, if (pte_swp_uffd_wp(pte)) swp_pte = pte_swp_mkuffd_wp(swp_pte); } - set_pte_at(mm, addr, ptep, swp_pte); + set_pte_at_replicated(mm, addr, ptep, swp_pte); /* * This is like regular unmap: we remove the rmap and @@ -534,6 +535,8 @@ int migrate_vma_setup(struct migrate_vma *args) return -EINVAL; if (args->fault_page && !is_device_private_page(args->fault_page)) return -EINVAL; + if (vma_has_replicas(args->vma)) + return -EINVAL; memset(args->src, 0, sizeof(*args->src) * nr_pages); args->cpages = 0; @@ -664,12 +667,12 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, if (flush) { flush_cache_page(vma, addr, pte_pfn(orig_pte)); - ptep_clear_flush(vma, addr, ptep); - set_pte_at_notify(mm, addr, ptep, entry); + ptep_clear_flush_replicated(vma, addr, ptep); + set_pte_at_notify_replicated(mm, addr, ptep, entry); update_mmu_cache(vma, addr, ptep); } else { /* No need to invalidate - it was non-present before */ - set_pte_at(mm, addr, ptep, entry); + set_pte_at_replicated(mm, addr, ptep, entry); update_mmu_cache(vma, addr, ptep); } diff --git a/mm/mlock.c b/mm/mlock.c index cd0997d89c7c5..efbfbb38c718f 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -25,6 +25,7 @@ #include <linux/memcontrol.h> #include <linux/mm_inline.h> #include <linux/secretmem.h> +#include <linux/numa_user_replication.h> #include "internal.h" @@ -490,6 +491,13 @@ static int mlock_fixup(struct vma_iterator *vmi, struct vm_area_struct *vma, /* don't set VM_LOCKED or VM_LOCKONFAULT and don't count */ goto out; +#ifdef CONFIG_USER_REPLICATION + if (!(newflags & VM_REPLICA_COMMIT) && vma_has_replicas(vma)) { + if ((ret = phys_deduplicate(vma, start, end - start, true))) + goto out; + } +#endif + pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); *prev = vma_merge(vmi, mm, *prev, start, end, newflags, vma->anon_vma, vma->vm_file, pgoff, vma_policy(vma), @@ -570,6 +578,18 @@ static int apply_vma_lock_flags(unsigned long start, size_t len, newflags = vma->vm_flags & ~VM_LOCKED_MASK; newflags |= flags; + +#ifdef CONFIG_USER_REPLICATION + if (vma->vm_mm && memcg_replication_enabled(vma->vm_mm)) { + WARN_ON_ONCE(!numa_is_vma_replicant(vma)); + newflags |= VM_REPLICA_INIT; + if (vmflags_might_be_replicated(newflags)) + newflags |= VM_REPLICA_COMMIT; + else + newflags &= ~VM_REPLICA_COMMIT; + } +#endif + /* Here we know that vma->vm_start <= nstart < vma->vm_end. */ tmp = vma->vm_end; if (tmp > end) @@ -767,6 +787,17 @@ static int apply_mlockall_flags(int flags) newflags = vma->vm_flags & ~VM_LOCKED_MASK; newflags |= to_add; +#ifdef CONFIG_USER_REPLICATION + if (vma->vm_mm && memcg_replication_enabled(vma->vm_mm)) { + WARN_ON_ONCE(!numa_is_vma_replicant(vma)); + newflags |= VM_REPLICA_INIT; + if (vmflags_might_be_replicated(newflags)) + newflags |= VM_REPLICA_COMMIT; + else + newflags &= ~VM_REPLICA_COMMIT; + } +#endif + /* Ignore errors */ mlock_fixup(&vmi, vma, &prev, vma->vm_start, vma->vm_end, newflags); diff --git a/mm/mmap.c b/mm/mmap.c index dfa3d2bfe2891..19d03b6a16591 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -48,6 +48,7 @@ #include <linux/sched/mm.h> #include <linux/ksm.h> #include <linux/share_pool.h> +#include <linux/numa_user_replication.h> #include <linux/uaccess.h> #include <asm/cacheflush.h> @@ -1432,6 +1433,14 @@ unsigned long __do_mmap_mm(struct mm_struct *mm, struct file *file, unsigned lon vm_flags |= VM_NORESERVE; } +#ifdef CONFIG_USER_REPLICATION + if (memcg_replication_enabled(mm) || (flags & MAP_REPLICA)) { + vm_flags |= VM_REPLICA_INIT; + if (vmflags_might_be_replicated(vm_flags)) + vm_flags |= VM_REPLICA_COMMIT; + } +#endif + addr = __mmap_region(mm, file, addr, len, vm_flags, pgoff, uf); if (!IS_ERR_VALUE(addr) && ((vm_flags & VM_LOCKED) || @@ -1840,7 +1849,14 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, return addr; } +#ifdef CONFIG_USER_REPLICATION + if (flags & MAP_REPLICA) + info.flags = 0; + else + info.flags = VM_UNMAPPED_AREA_TOPDOWN; +#else info.flags = VM_UNMAPPED_AREA_TOPDOWN; +#endif info.length = len; info.low_limit = PAGE_SIZE; info.high_limit = arch_get_mmap_base(addr, mm->mmap_base); @@ -3198,6 +3214,14 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma, * Note: This happens *after* clearing old mappings in some code paths. */ flags |= VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; +#ifdef CONFIG_USER_REPLICATION + if (memcg_replication_enabled(mm)) { + flags |= VM_REPLICA_INIT; + if (vmflags_might_be_replicated(flags)) + flags |= VM_REPLICA_COMMIT; + } +#endif + if (!may_expand_vm(mm, flags, len >> PAGE_SHIFT)) return -ENOMEM; @@ -3666,6 +3690,14 @@ static struct vm_area_struct *__install_special_mapping( vma->vm_ops = ops; vma->vm_private_data = priv; +#ifdef CONFIG_USER_REPLICATION + if (memcg_replication_enabled(mm)) { + __vm_flags_mod(vma, VM_REPLICA_INIT, VM_NONE); + if (vma_might_be_replicated(vma)) + __vm_flags_mod(vma, VM_REPLICA_COMMIT, VM_NONE); + } +#endif + ret = insert_vm_struct(mm, vma); if (ret) goto out; diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c index 99b3e9408aa0f..24cbbd8bb0a93 100644 --- a/mm/mmu_gather.c +++ b/mm/mmu_gather.c @@ -9,6 +9,7 @@ #include <linux/smp.h> #include <linux/swap.h> #include <linux/rmap.h> +#include <linux/numa_user_replication.h> #include <asm/pgalloc.h> #include <asm/tlb.h> @@ -167,6 +168,19 @@ static bool __tlb_remove_folio_pages_size(struct mmu_gather *tlb, { int flags = delay_rmap ? ENCODED_PAGE_BIT_DELAY_RMAP : 0; struct mmu_gather_batch *batch; +#ifndef CONFIG_USER_REPLICATION + /* + * Make sure that we can always add another "page" + "nr_pages", + * requiring two entries instead of only a single one. + */ + const int batch_reserve = 1; +#else + /* + * And also make sure that we can always add fully replicated pages, + * requiring 'mem_nodes' entries. + */ + const int batch_reserve = max(1, num_node_state(N_MEMORY) - 1); +#endif VM_BUG_ON(!tlb->end); @@ -188,19 +202,56 @@ static bool __tlb_remove_folio_pages_size(struct mmu_gather *tlb, batch->encoded_pages[batch->nr++] = encode_page(page, flags); batch->encoded_pages[batch->nr++] = encode_nr_pages(nr_pages); } + + if (batch->nr >= batch->max - batch_reserve) { + if (!tlb_next_batch(tlb)) + return true; + batch = tlb->active; + } + VM_BUG_ON_PAGE(batch->nr > batch->max - batch_reserve, page); + + return false; +} + +#ifdef CONFIG_USER_REPLICATION +bool __tlb_remove_replica_pages_size(struct mmu_gather *tlb, struct page **pages, + int page_size) +{ + struct mmu_gather_batch *batch; /* * Make sure that we can always add another "page" + "nr_pages", * requiring two entries instead of only a single one. + * + * And also make sure that we can always add fully replicated pages, + * requiring 'mem_nodes' entries. */ - if (batch->nr >= batch->max - 1) { + const int batch_reserve = max(1, num_node_state(N_MEMORY) - 1); + int nid; + + VM_BUG_ON(!tlb->end); + +#ifdef CONFIG_MMU_GATHER_PAGE_SIZE + VM_WARN_ON(tlb->page_size != page_size); +#endif + + batch = tlb->active; + /* + * Add the page and check if we are full. If so + * force a flush. + */ + for_each_memory_node(nid) + batch->encoded_pages[batch->nr++] = encode_page(pages[nid], 0); + + if (batch->nr >= batch->max - batch_reserve) { if (!tlb_next_batch(tlb)) return true; batch = tlb->active; } - VM_BUG_ON_PAGE(batch->nr > batch->max - 1, page); + VM_BUG_ON_PAGE(batch->nr > batch->max - batch_reserve, pages[0]); return false; } +#endif bool __tlb_remove_folio_pages(struct mmu_gather *tlb, struct page *page, unsigned int nr_pages, bool delay_rmap) diff --git a/mm/mprotect.c b/mm/mprotect.c index ed0e21a053398..947be092af22b 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -32,6 +32,7 @@ #include <linux/sched/sysctl.h> #include <linux/userfaultfd_k.h> #include <linux/memory-tiers.h> +#include <linux/numa_user_replication.h> #include <asm/cacheflush.h> #include <asm/mmu_context.h> #include <asm/tlbflush.h> @@ -80,209 +81,234 @@ bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr, return pte_dirty(pte); } -static long change_pte_range(struct mmu_gather *tlb, - struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, - unsigned long end, pgprot_t newprot, unsigned long cp_flags) +static long change_pte_entry(struct mmu_gather *tlb, + struct vm_area_struct *vma, pte_t *pte, unsigned long addr, + pgprot_t newprot, unsigned long cp_flags) { - pte_t *pte, oldpte; - spinlock_t *ptl; + pte_t oldpte = ptep_get(pte); long pages = 0; int target_node = NUMA_NO_NODE; bool prot_numa = cp_flags & MM_CP_PROT_NUMA; bool uffd_wp = cp_flags & MM_CP_UFFD_WP; bool uffd_wp_resolve = cp_flags & MM_CP_UFFD_WP_RESOLVE; - tlb_change_page_size(tlb, PAGE_SIZE); - pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); - if (!pte) - return -EAGAIN; - /* Get target node for single threaded private VMAs */ if (prot_numa && !(vma->vm_flags & VM_SHARED) && atomic_read(&vma->vm_mm->mm_users) == 1) target_node = numa_node_id(); - flush_tlb_batched_pending(vma->vm_mm); - arch_enter_lazy_mmu_mode(); - do { - oldpte = ptep_get(pte); - if (pte_present(oldpte)) { - pte_t ptent; + if (pte_present(oldpte)) { + pte_t ptent; + + /* + * Avoid trapping faults against the zero or KSM + * pages. See similar comment in change_huge_pmd. + */ + if (prot_numa) { + struct folio *folio; + int nid; + bool toptier; + + /* Avoid TLB flush if possible */ + if (pte_protnone(oldpte)) + return pages; + + folio = vm_normal_folio(vma, addr, oldpte); + if (!folio || folio_is_zone_device(folio) || + folio_test_ksm(folio)) + return pages; + + /* Skip fully replicated memory */ + if (folio_test_replicated(folio)) + return pages; + + /* Also skip shared copy-on-write pages */ + if (is_cow_mapping(vma->vm_flags) && + (folio_maybe_dma_pinned(folio) || + folio_likely_mapped_shared(folio))) + return pages; /* - * Avoid trapping faults against the zero or KSM - * pages. See similar comment in change_huge_pmd. + * While migration can move some dirty pages, + * it cannot move them all from MIGRATE_ASYNC + * context. */ - if (prot_numa) { - struct folio *folio; - int nid; - bool toptier; - - /* Avoid TLB flush if possible */ - if (pte_protnone(oldpte)) - continue; - - folio = vm_normal_folio(vma, addr, oldpte); - if (!folio || folio_is_zone_device(folio) || - folio_test_ksm(folio)) - continue; - - /* Also skip shared copy-on-write pages */ - if (is_cow_mapping(vma->vm_flags) && - (folio_maybe_dma_pinned(folio) || - folio_likely_mapped_shared(folio))) - continue; + if (folio_is_file_lru(folio) && + folio_test_dirty(folio)) + return pages; - /* - * While migration can move some dirty pages, - * it cannot move them all from MIGRATE_ASYNC - * context. - */ - if (folio_is_file_lru(folio) && - folio_test_dirty(folio)) - continue; + /* + * Don't mess with PTEs if page is already on the node + * a single-threaded process is running on. + */ + nid = folio_nid(folio); + if (target_node == nid) + return pages; + toptier = node_is_toptier(nid); - /* - * Don't mess with PTEs if page is already on the node - * a single-threaded process is running on. - */ - nid = folio_nid(folio); - if (target_node == nid) - continue; - toptier = node_is_toptier(nid); + /* + * Skip scanning top tier node if normal numa + * balancing is disabled + */ + if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_NORMAL) && + toptier) + return pages; + if (folio_use_access_time(folio)) + folio_xchg_access_time(folio, + jiffies_to_msecs(jiffies)); + } - /* - * Skip scanning top tier node if normal numa - * balancing is disabled - */ - if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_NORMAL) && - toptier) - continue; - if (folio_use_access_time(folio)) - folio_xchg_access_time(folio, - jiffies_to_msecs(jiffies)); - } + oldpte = ptep_modify_prot_start(vma, addr, pte); + ptent = pte_modify(oldpte, newprot); - oldpte = ptep_modify_prot_start(vma, addr, pte); - ptent = pte_modify(oldpte, newprot); + if (uffd_wp) + ptent = pte_mkuffd_wp(ptent); + else if (uffd_wp_resolve) + ptent = pte_clear_uffd_wp(ptent); - if (uffd_wp) - ptent = pte_mkuffd_wp(ptent); - else if (uffd_wp_resolve) - ptent = pte_clear_uffd_wp(ptent); + /* + * In some writable, shared mappings, we might want + * to catch actual write access -- see + * vma_wants_writenotify(). + * + * In all writable, private mappings, we have to + * properly handle COW. + * + * In both cases, we can sometimes still change PTEs + * writable and avoid the write-fault handler, for + * example, if a PTE is already dirty and no other + * COW or special handling is required. + */ + if ((cp_flags & MM_CP_TRY_CHANGE_WRITABLE) && + !pte_write(ptent) && + can_change_pte_writable(vma, addr, ptent)) + ptent = pte_mkwrite(ptent, vma); + + ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent); + if (pte_needs_flush(oldpte, ptent)) + tlb_flush_pte_range(tlb, addr, PAGE_SIZE); + pages++; + } else if (is_swap_pte(oldpte)) { + swp_entry_t entry = pte_to_swp_entry(oldpte); + pte_t newpte; + + if (is_writable_migration_entry(entry)) { + struct folio *folio = pfn_swap_entry_folio(entry); /* - * In some writable, shared mappings, we might want - * to catch actual write access -- see - * vma_wants_writenotify(). - * - * In all writable, private mappings, we have to - * properly handle COW. - * - * In both cases, we can sometimes still change PTEs - * writable and avoid the write-fault handler, for - * example, if a PTE is already dirty and no other - * COW or special handling is required. + * A protection check is difficult so + * just be safe and disable write */ - if ((cp_flags & MM_CP_TRY_CHANGE_WRITABLE) && - !pte_write(ptent) && - can_change_pte_writable(vma, addr, ptent)) - ptent = pte_mkwrite(ptent, vma); - - ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent); - if (pte_needs_flush(oldpte, ptent)) - tlb_flush_pte_range(tlb, addr, PAGE_SIZE); - pages++; - } else if (is_swap_pte(oldpte)) { - swp_entry_t entry = pte_to_swp_entry(oldpte); - pte_t newpte; - - if (is_writable_migration_entry(entry)) { - struct folio *folio = pfn_swap_entry_folio(entry); - - /* - * A protection check is difficult so - * just be safe and disable write - */ - if (folio_test_anon(folio)) - entry = make_readable_exclusive_migration_entry( - swp_offset(entry)); - else - entry = make_readable_migration_entry(swp_offset(entry)); - newpte = swp_entry_to_pte(entry); - if (pte_swp_soft_dirty(oldpte)) - newpte = pte_swp_mksoft_dirty(newpte); - } else if (is_writable_device_private_entry(entry)) { - /* - * We do not preserve soft-dirtiness. See - * copy_nonpresent_pte() for explanation. - */ - entry = make_readable_device_private_entry( - swp_offset(entry)); - newpte = swp_entry_to_pte(entry); - if (pte_swp_uffd_wp(oldpte)) - newpte = pte_swp_mkuffd_wp(newpte); - } else if (is_writable_device_exclusive_entry(entry)) { - entry = make_readable_device_exclusive_entry( - swp_offset(entry)); - newpte = swp_entry_to_pte(entry); - if (pte_swp_soft_dirty(oldpte)) - newpte = pte_swp_mksoft_dirty(newpte); - if (pte_swp_uffd_wp(oldpte)) - newpte = pte_swp_mkuffd_wp(newpte); - } else if (is_pte_marker_entry(entry)) { - /* - * Ignore error swap entries unconditionally, - * because any access should sigbus anyway. - */ - if (is_poisoned_swp_entry(entry)) - continue; - /* - * If this is uffd-wp pte marker and we'd like - * to unprotect it, drop it; the next page - * fault will trigger without uffd trapping. - */ - if (uffd_wp_resolve) { - pte_clear(vma->vm_mm, addr, pte); - pages++; - } - continue; - } else { - newpte = oldpte; - } - - if (uffd_wp) + if (folio_test_anon(folio)) + entry = make_readable_exclusive_migration_entry( + swp_offset(entry)); + else + entry = make_readable_migration_entry(swp_offset(entry)); + newpte = swp_entry_to_pte(entry); + if (pte_swp_soft_dirty(oldpte)) + newpte = pte_swp_mksoft_dirty(newpte); + } else if (is_writable_device_private_entry(entry)) { + /* + * We do not preserve soft-dirtiness. See + * copy_nonpresent_pte() for explanation. + */ + entry = make_readable_device_private_entry( + swp_offset(entry)); + newpte = swp_entry_to_pte(entry); + if (pte_swp_uffd_wp(oldpte)) newpte = pte_swp_mkuffd_wp(newpte); - else if (uffd_wp_resolve) - newpte = pte_swp_clear_uffd_wp(newpte); - - if (!pte_same(oldpte, newpte)) { - set_pte_at(vma->vm_mm, addr, pte, newpte); + } else if (is_writable_device_exclusive_entry(entry)) { + entry = make_readable_device_exclusive_entry( + swp_offset(entry)); + newpte = swp_entry_to_pte(entry); + if (pte_swp_soft_dirty(oldpte)) + newpte = pte_swp_mksoft_dirty(newpte); + if (pte_swp_uffd_wp(oldpte)) + newpte = pte_swp_mkuffd_wp(newpte); + } else if (is_pte_marker_entry(entry)) { + /* + * Ignore error swap entries unconditionally, + * because any access should sigbus anyway. + */ + if (is_poisoned_swp_entry(entry)) + return pages; + /* + * If this is uffd-wp pte marker and we'd like + * to unprotect it, drop it; the next page + * fault will trigger without uffd trapping. + */ + if (uffd_wp_resolve) { + pte_clear(vma->vm_mm, addr, pte); pages++; } + return pages; } else { - /* It must be an none page, or what else?.. */ - WARN_ON_ONCE(!pte_none(oldpte)); + newpte = oldpte; + } + + if (uffd_wp) + newpte = pte_swp_mkuffd_wp(newpte); + else if (uffd_wp_resolve) + newpte = pte_swp_clear_uffd_wp(newpte); + + if (!pte_same(oldpte, newpte)) { + set_pte_at(vma->vm_mm, addr, pte, newpte); + pages++; + } + } else { + /* It must be an none page, or what else?.. */ + WARN_ON_ONCE(!pte_none(oldpte)); + /* + * Nobody plays with any none ptes besides + * userfaultfd when applying the protections. + */ + if (likely(!uffd_wp)) + return pages; + + if (userfaultfd_wp_use_markers(vma)) { /* - * Nobody plays with any none ptes besides - * userfaultfd when applying the protections. + * For file-backed mem, we need to be able to + * wr-protect a none pte, because even if the + * pte is none, the page/swap cache could + * exist. Doing that by install a marker. */ - if (likely(!uffd_wp)) - continue; + set_pte_at(vma->vm_mm, addr, pte, + make_pte_marker(PTE_MARKER_UFFD_WP)); + pages++; + } + } - if (userfaultfd_wp_use_markers(vma)) { - /* - * For file-backed mem, we need to be able to - * wr-protect a none pte, because even if the - * pte is none, the page/swap cache could - * exist. Doing that by install a marker. - */ - set_pte_at(vma->vm_mm, addr, pte, - make_pte_marker(PTE_MARKER_UFFD_WP)); - pages++; + return pages; +} + +static long change_pte_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, + unsigned long end, pgprot_t newprot, unsigned long cp_flags) +{ + pte_t *pte; + spinlock_t *ptl; + long pages = 0; + + tlb_change_page_size(tlb, PAGE_SIZE); + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + if (!pte) + return -EAGAIN; + + flush_tlb_batched_pending(vma->vm_mm); + arch_enter_lazy_mmu_mode(); + do { + pages += change_pte_entry(tlb, vma, pte, addr, newprot, cp_flags); +#ifdef CONFIG_USER_REPLICATION + if (numa_pgtable_replicated(pte)) { + unsigned long offset; + struct ptdesc *curr; + pte_t *curr_pte; + for_each_pgtable_replica(curr, curr_pte, pte, offset) { + change_pte_entry(tlb, vma, curr_pte, addr, newprot, cp_flags); } } +#endif } while (pte++, addr += PAGE_SIZE, addr != end); arch_leave_lazy_mmu_mode(); pte_unmap_unlock(pte - 1, ptl); @@ -492,7 +518,7 @@ static long change_protection_range(struct mmu_gather *tlb, long pages = 0, ret; BUG_ON(addr >= end); - pgd = pgd_offset(mm, addr); + pgd = pgd_offset_pgd(this_node_pgd(mm), addr); tlb_start_vma(tlb, vma); do { next = pgd_addr_end(addr, end); @@ -627,6 +653,13 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb, } } +#ifdef CONFIG_USER_REPLICATION + if (!(newflags & VM_REPLICA_COMMIT) && vma_has_replicas(vma)) { + if ((error = phys_deduplicate(vma, start, end - start, true))) + goto fail; + } +#endif + /* * First try to merge with previous and/or next vma. */ @@ -698,6 +731,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len, const int grows = prot & (PROT_GROWSDOWN|PROT_GROWSUP); const bool rier = (current->personality & READ_IMPLIES_EXEC) && (prot & PROT_READ); + bool arch_invalid_prot; struct mmu_gather tlb; struct vma_iterator vmi; @@ -715,7 +749,11 @@ static int do_mprotect_pkey(unsigned long start, size_t len, end = start + len; if (end <= start) return -ENOMEM; - if (!arch_validate_prot(prot, start)) + arch_invalid_prot = !arch_validate_prot(prot, start); +#ifdef CONFIG_USER_REPLICATION + arch_invalid_prot = arch_invalid_prot && (prot != PROT_REPLICA); +#endif + if (arch_invalid_prot) return -EINVAL; reqprot = prot; @@ -737,6 +775,22 @@ static int do_mprotect_pkey(unsigned long start, size_t len, if (!vma) goto out; +#ifdef CONFIG_USER_REPLICATION + if (prot == PROT_REPLICA) { + error = -EINVAL; + if (!vma_might_be_replicated(vma)) + goto out; + + if (!vma_has_replicas(vma)) + vm_flags_set(vma, VM_REPLICA_COMMIT); + error = phys_duplicate(vma, start, len); + if (error) + pr_info("Failed to replicate memory -- start:%zx; len:%zx PID: %d NAME: %s\n", + start, len, current->pid, current->comm); + goto out; + } +#endif + if (unlikely(grows & PROT_GROWSDOWN)) { if (vma->vm_start >= end) goto out; @@ -787,6 +841,17 @@ static int do_mprotect_pkey(unsigned long start, size_t len, newflags = calc_vm_prot_bits(prot, new_vma_pkey); newflags |= (vma->vm_flags & ~mask_off_old_flags); +#ifdef CONFIG_USER_REPLICATION + if (vma->vm_mm && memcg_replication_enabled(vma->vm_mm)) { + WARN_ON_ONCE(!numa_is_vma_replicant(vma)); + newflags |= VM_REPLICA_INIT; + if (vmflags_might_be_replicated(newflags)) + newflags |= VM_REPLICA_COMMIT; + else + newflags &= ~VM_REPLICA_COMMIT; + } +#endif + /* newflags >> 4 shift VM_MAY% in place of VM_% */ if ((newflags & ~(newflags >> 4)) & VM_ACCESS_FLAGS) { error = -EACCES; diff --git a/mm/mremap.c b/mm/mremap.c index e990bb8c89181..f6f716106f560 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -27,6 +27,7 @@ #include <linux/mempolicy.h> #include <linux/share_pool.h> #include <linux/userswap.h> +#include <linux/numa_user_replication.h> #include <asm/cacheflush.h> #include <asm/tlb.h> @@ -193,7 +194,7 @@ static int move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, if (pte_none(ptep_get(old_pte))) continue; - pte = ptep_get_and_clear(mm, old_addr, old_pte); + pte = ptep_get_and_clear_replicated(mm, old_addr, old_pte); /* * If we are remapping a valid PTE, make sure * to flush TLB before we drop the PTL for the @@ -209,7 +210,7 @@ static int move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, force_flush = true; pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr); pte = move_soft_dirty_pte(pte); - set_pte_at(mm, new_addr, new_pte, pte); + set_pte_at_replicated(mm, new_addr, new_pte, pte); } arch_leave_lazy_mmu_mode(); @@ -242,6 +243,11 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, struct mm_struct *mm = vma->vm_mm; bool res = false; pmd_t pmd; +#ifdef CONFIG_USER_REPLICATION + pmd_t pmd_numa[MAX_NUMNODES]; + bool old_pte_replicated = numa_pgtable_replicated(page_to_virt(pmd_pgtable(*old_pmd))); + bool new_pmd_replicated = numa_pgtable_replicated(new_pmd); +#endif if (!arch_supports_page_table_move()) return false; @@ -271,6 +277,15 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, if (WARN_ON_ONCE(!pmd_none(*new_pmd))) return false; +#ifdef CONFIG_USER_REPLICATION + /* + * In that case, we need to somehow get rid of page tables replicas of pte level + * I am not sure how to do it properly right now, so fallback to slowpath + */ + if (old_pte_replicated && !new_pmd_replicated) + return false; +#endif + /* * We don't have to worry about the ordering of src and dst * ptlocks because exclusive mmap_lock prevents deadlock. @@ -280,18 +295,43 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, if (new_ptl != old_ptl) spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); +#ifdef CONFIG_USER_REPLICATION + if (old_pte_replicated) { + int nid; + unsigned long offset; + struct ptdesc *curr; + pmd_t *curr_pmd; + bool start; + + for_each_pgtable(curr, curr_pmd, old_pmd, nid, offset, start) + pmd_numa[nid] = *(curr_pmd); + } +#endif pmd = *old_pmd; /* Racing with collapse? */ if (unlikely(!pmd_present(pmd) || pmd_leaf(pmd))) goto out_unlock; /* Clear the pmd */ - pmd_clear(old_pmd); + pmd_clear_replicated(old_pmd); res = true; VM_BUG_ON(!pmd_none(*new_pmd)); - pmd_populate(mm, new_pmd, pmd_pgtable(pmd)); +#ifdef CONFIG_USER_REPLICATION + if (new_pmd_replicated && old_pte_replicated) { + int nid; + unsigned long offset; + struct ptdesc *curr; + pmd_t *curr_pmd; + bool start; + + for_each_pgtable(curr, curr_pmd, new_pmd, nid, offset, start) + pmd_populate(mm, curr_pmd, pmd_pgtable(pmd_numa[nid])); + } else +#endif + pmd_populate_replicated(mm, new_pmd, pmd_pgtable(pmd)); + flush_tlb_range(vma, old_addr, old_addr + PMD_SIZE); out_unlock: if (new_ptl != old_ptl) @@ -316,6 +356,11 @@ static bool move_normal_pud(struct vm_area_struct *vma, unsigned long old_addr, spinlock_t *old_ptl, *new_ptl; struct mm_struct *mm = vma->vm_mm; pud_t pud; +#ifdef CONFIG_USER_REPLICATION + pud_t pud_numa[MAX_NUMNODES]; + bool old_pmd_replicated = numa_pgtable_replicated(pud_pgtable(*old_pud)); + bool new_pud_replicated = numa_pgtable_replicated(new_pud); +#endif if (!arch_supports_page_table_move()) return false; @@ -326,6 +371,15 @@ static bool move_normal_pud(struct vm_area_struct *vma, unsigned long old_addr, if (WARN_ON_ONCE(!pud_none(*new_pud))) return false; +#ifdef CONFIG_USER_REPLICATION + /* + * In that case, we need to somehow get rid of page tables replicas of pmd level + * I am not sure how to do it properly right now, so fallback to slowpath + */ + if (old_pmd_replicated && !new_pud_replicated) + return false; +#endif + /* * We don't have to worry about the ordering of src and dst * ptlocks because exclusive mmap_lock prevents deadlock. @@ -336,12 +390,37 @@ static bool move_normal_pud(struct vm_area_struct *vma, unsigned long old_addr, spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); /* Clear the pud */ +#ifdef CONFIG_USER_REPLICATION + if (old_pmd_replicated) { + int nid; + unsigned long offset; + struct ptdesc *curr; + pud_t *curr_pud; + bool start; + + for_each_pgtable(curr, curr_pud, old_pud, nid, offset, start) + pud_numa[nid] = *(curr_pud); + } +#endif pud = *old_pud; - pud_clear(old_pud); + pud_clear_replicated(old_pud); VM_BUG_ON(!pud_none(*new_pud)); - pud_populate(mm, new_pud, pud_pgtable(pud)); +#ifdef CONFIG_USER_REPLICATION + if (new_pud_replicated && old_pmd_replicated) { + int nid; + unsigned long offset; + struct ptdesc *curr; + pud_t *curr_pud; + bool start; + + for_each_pgtable(curr, curr_pud, new_pud, nid, offset, start) + pud_populate(mm, curr_pud, pud_pgtable(pud_numa[nid])); + } else +#endif + pud_populate_replicated(mm, new_pud, pud_pgtable(pud)); + flush_tlb_range(vma, old_addr, old_addr + PUD_SIZE); if (new_ptl != old_ptl) spin_unlock(new_ptl); @@ -776,6 +855,12 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr, return ERR_PTR(-EINVAL); } + /* + * For simplicity, remap is not supported for has_replicas vmas right now + */ + if(vma_has_replicas(vma)) + return ERR_PTR(-EINVAL); + if ((flags & MREMAP_DONTUNMAP) && (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP))) return ERR_PTR(-EINVAL); diff --git a/mm/numa_kernel_replication.c b/mm/numa_kernel_replication.c index 17664a1300b87..555be093bd794 100644 --- a/mm/numa_kernel_replication.c +++ b/mm/numa_kernel_replication.c @@ -625,6 +625,8 @@ static void replicate_pgtables(void) init_mm.pgd_numa[nid] = node_desc[memory_nid].pgd; } + + init_mm.pgd = init_mm.pgd_numa[first_memory_node]; } static void __init numa_replicate_kernel_text_disabled(void) @@ -742,7 +744,7 @@ static int __init setup_kernel_replication(char *str) __setup("kernel_replication=", setup_kernel_replication); -nodemask_t __ro_after_init replica_nodes = { { [0] = 1UL } }; +extern nodemask_t replica_nodes; /* * Let us pretend, that we have only single node fore replicas. diff --git a/mm/numa_user_replication.c b/mm/numa_user_replication.c new file mode 100644 index 0000000000000..d7540c1ae3e50 --- /dev/null +++ b/mm/numa_user_replication.c @@ -0,0 +1,1577 @@ +#include <linux/numa_user_replication.h> +#include <asm/tlb.h> + +#include "internal.h" + +static int pick_remaining_node(struct page *page, struct vm_area_struct *vma, + unsigned long addr) { + return mpol_misplaced(page_folio(page), vma, addr); +} + +static int phys_deduplicate_pte_entry(struct mmu_gather *tlb, + struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, + bool alloc_new_page, struct page **new_page) +{ + struct page *orig_page; + pte_t *pte, entry, orig_entry; + spinlock_t *ptl; + struct pgtable_private ptes; + int nid, orig_nid; + + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + entry = ptep_get(pte); + + if (!pte_present(entry)) { + pte_unmap_unlock(pte, ptl); + return 0; + } else { + struct page *page = vm_normal_page(vma, addr, entry); + BUG_ON(page && folio_test_large(page_folio(page))); + + if (!page || !PageReplicated(page)) { + pte_unmap_unlock(pte, ptl); + return 0; + } + } + + pgtable_update_pte(&ptes, pte); + for_each_memory_node(nid) { + ptes.replica_pages[nid] = vm_normal_page(vma, addr, ptep_get(ptes.pte_numa[nid])); + } + + if (alloc_new_page) { + orig_nid = NUMA_NO_NODE; + orig_page = *new_page; + *new_page = NULL; + } else { + orig_nid = pick_remaining_node(ptes.replica_pages[first_memory_node], vma, addr); + if (orig_nid == NUMA_NO_NODE) + orig_nid = first_memory_node; + + orig_page = ptes.replica_pages[orig_nid]; + } + + orig_entry = mk_pte(orig_page, vma->vm_page_prot); + + if (alloc_new_page) { + void* src_vaddr = page_to_virt(ptes.replica_pages[first_memory_node]); + void* new_vaddr = page_to_virt(orig_page); + copy_page(new_vaddr, src_vaddr); + + __SetPageUptodate(orig_page); + + inc_mm_counter(vma->vm_mm, MM_ANONPAGES); + add_reliable_page_counter(orig_page, vma->vm_mm, 1); + } else { + ClearPageReplicated(orig_page); + } + + folio_add_new_anon_rmap(page_folio(orig_page), vma, addr, RMAP_EXCLUSIVE); + folio_add_lru_vma(page_folio(orig_page), vma); + + for_each_memory_node(nid) { + if (nid == orig_nid) + continue; + + set_pte_at(vma->vm_mm, addr, ptes.pte_numa[nid], orig_entry); + tlb_remove_tlb_entry(tlb, ptes.pte_numa[nid], addr); + } + + pte_unmap_unlock(pte, ptl); + + for_each_memory_node(nid) { + if (nid == orig_nid) + continue; + + dec_mm_counter(vma->vm_mm, MM_ANONPAGES); + add_reliable_page_counter(ptes.replica_pages[nid], vma->vm_mm, -1); + + tlb_remove_page(tlb, ptes.replica_pages[nid]); + } + + return 0; +} + +static int prealloc_page_for_deduplication(struct vm_area_struct *vma, + unsigned long addr, bool alloc_new_page, struct page **page) +{ + struct folio *folio; + + if (!alloc_new_page || *page) + return 0; + + folio = vma_alloc_zeroed_movable_folio(vma, addr); + if (!folio) + return -ENOMEM; + if (mem_cgroup_charge(folio, vma->vm_mm, GFP_KERNEL)) { + folio_put(folio); + return -ENOMEM; + } + folio_throttle_swaprate(folio, GFP_KERNEL); + + *page = folio_page(folio, 0); + return 0; +} + +static int phys_deduplicate_pte_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, + unsigned long end, bool alloc_new_page) +{ + struct page *prealloc_page = NULL; + int error = 0; + + tlb_change_page_size(tlb, PAGE_SIZE); + + flush_tlb_batched_pending(vma->vm_mm); + arch_enter_lazy_mmu_mode(); + do { + error = prealloc_page_for_deduplication(vma, addr, alloc_new_page, &prealloc_page); + if (error) + break; + error = phys_deduplicate_pte_entry(tlb, vma, pmd, addr, alloc_new_page, &prealloc_page); + if (error) + break; + } while (addr += PAGE_SIZE, addr != end); + arch_leave_lazy_mmu_mode(); + + if (prealloc_page) + put_page(prealloc_page); + + return error; +} + +static int phys_deduplicate_pmd_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pud_t *pud, unsigned long addr, + unsigned long end, bool alloc_new_page) +{ + pmd_t *pmd; + unsigned long next; + int error = 0; + + pmd = pmd_offset(pud, addr); + do { + pmd_t _pmd; + + next = pmd_addr_end(addr, end); + + if (pmd_none(*pmd)) + goto next; + + _pmd = pmdp_get_lockless(pmd); + if (is_swap_pmd(_pmd) || pmd_trans_huge(_pmd) || pmd_devmap(_pmd)) + BUG(); // not supported right now, probably only trans_huge will be + + error = phys_deduplicate_pte_range(tlb, vma, pmd, addr, next, alloc_new_page); + if (error) + break; +next: + cond_resched(); + } while (pmd++, addr = next, addr != end); + + return error; +} + +static int phys_deduplicate_pud_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, p4d_t *p4d, unsigned long addr, + unsigned long end, bool alloc_new_page) +{ + pud_t *pud; + unsigned long next; + int error = 0; + + pud = pud_offset(p4d, addr); + do { + next = pud_addr_end(addr, end); + if (pud_none_or_clear_bad(pud)) + continue; + error = phys_deduplicate_pmd_range(tlb, vma, pud, addr, next, alloc_new_page); + if (error) + break; + } while (pud++, addr = next, addr != end); + + return error; +} + +static int phys_deduplicate_p4d_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pgd_t *pgd, unsigned long addr, + unsigned long end, bool alloc_new_page) +{ + p4d_t *p4d; + unsigned long next; + int error = 0; + + p4d = p4d_offset(pgd, addr); + do { + next = p4d_addr_end(addr, end); + if (p4d_none_or_clear_bad(p4d)) + continue; + error = phys_deduplicate_pud_range(tlb, vma, p4d, addr, next, alloc_new_page); + if (error) + break; + } while (p4d++, addr = next, addr != end); + + return error; +} + +/* + * Pages inside [addr; end) are 100% populated, + * so we can't skip some checks and simplify code. + */ +static int phys_deduplicate_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, unsigned long addr, + unsigned long end, bool alloc_new_page) +{ + struct mm_struct *mm = vma->vm_mm; + pgd_t *pgd; + unsigned long next; + int error = 0; + + if (addr == end) + return 0; + + BUG_ON(addr >= end); + pgd = pgd_offset_pgd(this_node_pgd(mm), addr); + tlb_start_vma(tlb, vma); + do { + next = pgd_addr_end(addr, end); + if (pgd_none_or_clear_bad(pgd)) + continue; + error = phys_deduplicate_p4d_range(tlb, vma, pgd, addr, next, alloc_new_page); + if (error) + break; + } while (pgd++, addr = next, addr != end); + + tlb_end_vma(tlb, vma); + + return error; +} + +static int numa_remove_replicas(struct mmu_gather *tlb, + struct vm_area_struct *vma, unsigned long start, + unsigned long end, bool alloc_new_page) +{ + int error; + + start = start & PAGE_MASK; + end = end & PAGE_MASK; + + error = phys_deduplicate_range(tlb, vma, start, end, alloc_new_page); +// if (!error && printk_ratelimit()) { +// pr_info("Deduplicated range: 0x%016lx --- 0x%016lx, mm: 0x%016lx, PID: %d name: %s\n", +// start, end, (unsigned long)(vma->vm_mm), vma->vm_mm->owner->pid, vma->vm_mm->owner->comm); +// } + BUG_ON(error && !alloc_new_page); + + return error; +} + +/* + * We must hold at least mmap_read_lock or vma_read_lock + */ +int phys_deduplicate(struct vm_area_struct *vma, unsigned long start, size_t len, + bool alloc_new_page) +{ + int error = 0; + struct mmu_gather tlb; + + if (!vma) { + pr_warn("%s -- %s:%d\n", __func__, __FILE__, __LINE__); + return -EINVAL; + } + + BUG_ON(vma_has_replicas(vma) && !vma_might_be_replicated(vma)); + if (!vma_has_replicas(vma)) { + pr_warn("%s -- %s:%d\n", __func__, __FILE__, __LINE__); + return -EINVAL; + } + + if ((start < vma->vm_start) || (start + len > vma->vm_end)) { + pr_warn("Deduplication is possible only inside vma\n"); + pr_warn("vma->vm_start %zx; len %zx\n", vma->vm_start, + vma->vm_end - vma->vm_start); + return -EINVAL; + } + + tlb_gather_mmu(&tlb, vma->vm_mm); + error = numa_remove_replicas(&tlb, vma, vma->vm_start, vma->vm_end, alloc_new_page); + tlb_finish_mmu(&tlb); + + return error; +} + +static int __fixup_fault(struct vm_area_struct *vma, unsigned long addr) { + return (handle_mm_fault(vma, addr, FAULT_FLAG_INTERRUPTIBLE | FAULT_FLAG_KILLABLE | + FAULT_FLAG_RETRY_NOWAIT | FAULT_FLAG_ALLOW_RETRY, NULL) & VM_FAULT_ERROR); +} + +static int fixup_fault(struct vm_area_struct *vma, unsigned long addr) { + vm_fault_t fault = __fixup_fault(vma, addr); + if (fault & VM_FAULT_SIGBUS) + return 0; + return !!(fault & VM_FAULT_ERROR); +} + +static int phys_duplicate_pte_entry(struct mmu_gather *tlb, + struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, + struct page **replica_pages) +{ + struct page *orig_page; + pte_t *pte, *orig_pte, orig_entry; + spinlock_t *ptl; + struct pgtable_private ptes; + int nid; + int reason = 0; +retry: + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + + if (!numa_pgtable_replicated(pte)) { + vm_fault_t fault; + pte_unmap_unlock(pte, ptl); + mmap_assert_locked(vma->vm_mm); + fault = __fixup_fault(vma, addr); + + if (fault & (VM_FAULT_SIGBUS | VM_FAULT_RETRY)) + return -EBUSY; + if(fault) + return -ENOMEM; + goto retry; + } + + pgtable_update_pte(&ptes, pte); + /* It could happen on a not yet faulted vaddr. Now we require from user to + * put MAP_POPULATE manually, but add it with MAP_REPLICA silently. + */ + orig_pte = ptes.pte_numa[first_memory_node]; + orig_entry = ptep_get(orig_pte); + + for_each_memory_node(nid) { + /* + * For some unknown reasons, there are cases, when + * pte_level populated only on single node. This is not good, + * to avoid this check all ptes now, but this should not happening at all + */ + if(!pte_present(ptep_get(ptes.pte_numa[nid]))) { + pte_unmap_unlock(pte, ptl); + return -EBUSY; + } + } + if (pte_write(orig_entry)) { + reason = 2; + goto bug; + } + + /* We can handle this case only for 0th node table (I hope so), + * because we are under pte_lock, which serializes migration pte modifications + */ + orig_page = vm_normal_page(vma, addr, orig_entry); + BUG_ON(orig_page && folio_test_large(page_folio(orig_page))); + + if (orig_page && PageReplicated(orig_page)) { + pte_unmap_unlock(pte, ptl); + return -EBUSY; + } + + for_each_memory_node(nid) { + struct page *src_page, *new_page; + void *src_vaddr, *new_vaddr; + pte_t *curr_pte, curr_entry, new_entry; + + curr_pte = ptes.pte_numa[nid]; + curr_entry = ptep_get(curr_pte); + src_page = pte_page(curr_entry); + + new_page = replica_pages[nid]; + replica_pages[nid] = NULL; + + new_vaddr = page_to_virt(new_page); + src_vaddr = page_to_virt(src_page); + copy_page(new_vaddr, src_vaddr); + + __SetPageUptodate(new_page); + + new_entry = mk_pte(new_page, vma->vm_page_prot); + + inc_mm_counter(vma->vm_mm, MM_ANONPAGES); + add_reliable_page_counter(new_page, vma->vm_mm, 1); + + set_pte_at(vma->vm_mm, addr, curr_pte, new_entry); + if (pte_needs_flush(curr_entry, new_entry)) + tlb_flush_pte_range(tlb, addr, PAGE_SIZE); + } + + if (orig_page) { + dec_mm_counter(vma->vm_mm, mm_counter(page_folio(orig_page))); + add_reliable_page_counter(orig_page, vma->vm_mm, -1); + folio_remove_rmap_pte(page_folio(orig_page), orig_page, vma); + } + + pte_unmap_unlock(pte, ptl); + + if (orig_page) { + free_pages_and_swap_cache((struct encoded_page **) &orig_page, 1); + } + + return 0; + +bug: + dump_mm_pgtables(vma->vm_mm, addr, addr + PAGE_SIZE * 4 - 1); + pr_info("Died because BUG_ON #%d\n", reason); + BUG(); +} + +static void release_prealloc_pages(struct page **pages) +{ + int nid; + for_each_memory_node(nid) { + if (pages[nid] != NULL) { + put_page(pages[nid]); + pages[nid] = NULL; + } + } +} + +static int prealloc_pages_for_replicas(struct mm_struct *mm, struct page **pages) +{ + int nid; + for_each_memory_node(nid) { + /* + * Do not reclaim in case of memory shortage, just fail + * We already don't have enough memory. + * Also, make replica pages unmovable + */ + pages[nid] = alloc_pages_node(nid, + (GFP_HIGHUSER | __GFP_THISNODE) & (~__GFP_DIRECT_RECLAIM), 0); + if (pages[nid] == NULL) + goto fail; + SetPageReplicated(pages[nid]); + if (mem_cgroup_charge(page_folio(pages[nid]), mm, GFP_KERNEL)) + goto fail; + } + + for_each_memory_node(nid) { + folio_throttle_swaprate(page_folio(pages[nid]), GFP_KERNEL); + } + + return 0; + +fail: + release_prealloc_pages(pages); + return - ENOMEM; +} + +/* + * We must hold at least mmap_read_lock or vma_read_lock + */ +unsigned long phys_duplicate_pte_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, + unsigned long end) +{ + struct page *prealloc_pages[MAX_NUMNODES] = {}; + + tlb_change_page_size(tlb, PAGE_SIZE); + + flush_tlb_batched_pending(vma->vm_mm); + arch_enter_lazy_mmu_mode(); + do { + int ret = 0; + if (prealloc_pages_for_replicas(vma->vm_mm, prealloc_pages)) + break; + ret = phys_duplicate_pte_entry(tlb, vma, pmd, addr, prealloc_pages); + if (ret) + release_prealloc_pages(prealloc_pages); + if (ret == -ENOMEM) + break; + } while (addr += PAGE_SIZE, addr != end); + arch_leave_lazy_mmu_mode(); + + return addr; +} + +static unsigned long phys_duplicate_pmd_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pud_t *pud, unsigned long addr, + unsigned long end) +{ + pmd_t *pmd; + unsigned long next; +retry: + pmd = pmd_offset(pud, addr); + do { + pmd_t _pmd; + + next = pmd_addr_end(addr, end); + + if (pmd_none(*pmd) || !numa_pgtable_replicated(pmd)) { + if (fixup_fault(vma, addr)) + break; + goto retry; + } + + _pmd = pmdp_get_lockless(pmd); + if (is_swap_pmd(_pmd) || pmd_trans_huge(_pmd) || pmd_devmap(_pmd)) { + BUG(); // not supported right now, probably only trans_huge will be + } + + addr = phys_duplicate_pte_range(tlb, vma, pmd, addr, next); + if (addr != next) + break; + cond_resched(); + } while (pmd++, addr != end); + + return addr; +} + +static unsigned long phys_duplicate_pud_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, p4d_t *p4d, unsigned long addr, + unsigned long end) +{ + pud_t *pud; + unsigned long next; +retry: + pud = pud_offset(p4d, addr); + do { + next = pud_addr_end(addr, end); + if(pud_none_or_clear_bad(pud) || !numa_pgtable_replicated(pud)) { + if (fixup_fault(vma, addr)) + break; + goto retry; + } + addr = phys_duplicate_pmd_range(tlb, vma, pud, addr, next); + if (addr != next) + break; + } while (pud++, addr != end); + + return addr; +} + +static unsigned long phys_duplicate_p4d_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pgd_t *pgd, unsigned long addr, + unsigned long end) +{ + p4d_t *p4d; + unsigned long next; +retry: + p4d = p4d_offset(pgd, addr); + do { + next = p4d_addr_end(addr, end); + if (p4d_none_or_clear_bad(p4d) || !numa_pgtable_replicated(p4d)) { + if (fixup_fault(vma, addr)) + break; + goto retry; + } + addr = phys_duplicate_pud_range(tlb, vma, p4d, addr, next); + if (addr != next) + break; + } while (p4d++, addr != end); + + return addr; +} + +static unsigned long phys_duplicate_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, unsigned long addr, + unsigned long end) +{ + struct mm_struct *mm = vma->vm_mm; + pgd_t *pgd; + unsigned long next; + + mmap_assert_locked(mm); + if (unlikely(anon_vma_prepare(vma))) + return addr; + + BUG_ON(addr >= end); + pgd = pgd_offset_pgd(this_node_pgd(mm), addr); + tlb_start_vma(tlb, vma); +retry: + do { + next = pgd_addr_end(addr, end); + if (pgd_none_or_clear_bad(pgd)) { + if (fixup_fault(vma, addr)) + break; + goto retry; + } + addr = phys_duplicate_p4d_range(tlb, vma, pgd, addr, next); + if (addr != next) + break; + } while (pgd++, addr != end); + + tlb_end_vma(tlb, vma); + + return addr; + +} + +static int numa_clone_pte(struct mmu_gather *tlb, + struct vm_area_struct *vma, unsigned long start, + unsigned long end) +{ + unsigned long last = 0; + + start = start & PAGE_MASK; + end = end & PAGE_MASK; + + last = phys_duplicate_range(tlb, vma, start, end); + if (last != end) { + phys_deduplicate_range(tlb, vma, start, last, false); + return -ENOMEM; + } + + return 0; +} + +/* + * We must hold at least mmap_read_lock but not vma_read_lock + */ +int phys_duplicate(struct vm_area_struct *vma, unsigned long start, size_t len) +{ + int error = 0; + struct mmu_gather tlb; + + if (!vma) { + pr_warn("%s -- %s:%d\n", __func__, __FILE__, __LINE__); + return -EINVAL; + } + + BUG_ON(vma_has_replicas(vma) && !vma_might_be_replicated(vma)); + if (!vma_has_replicas(vma)) { + pr_warn("%s -- %s:%d\n", __func__, __FILE__, __LINE__); + return -EINVAL; + } + + if ((start < vma->vm_start) || (start + len > vma->vm_end)) { + pr_warn("Replication is possible only inside vma\n"); + pr_warn("vma->vm_start %zx; len %zx\n", vma->vm_start, + vma->vm_end - vma->vm_start); + return -EINVAL; + } + + tlb_gather_mmu(&tlb, vma->vm_mm); + error = numa_clone_pte(&tlb, vma, start, start + len); + tlb_finish_mmu(&tlb); + + return error; +} + +void numa_mm_handle_replication(struct mm_struct *mm, bool enable, fork_policy_t fork_policy) +{ + struct vm_area_struct *vma; + MA_STATE(mas, &mm->mm_mt, 0, 0); + + mmap_write_lock(mm); + + switch (fork_policy) { + case FORK_DISCARD_REPLICA: + if (enable) + mm->cg_user_replication_active = true; + else + BUG_ON(mm->cg_user_replication_active); + break; + case FORK_KEEP_REPLICA: + if (enable) { + mm->cg_user_replication_active = true; + mm->fork_policy = FORK_KEEP_REPLICA; + } else { + mm->fork_policy = FORK_DISCARD_REPLICA; + } + break; + case FORK_NO_REPLICA: + default: + BUG(); + } + + if (!enable) + goto out; + + mas_for_each(&mas, vma, ULONG_MAX) { + vm_flags_set(vma, VM_REPLICA_INIT); + if (vma_might_be_replicated(vma)) { + vm_flags_set(vma, VM_REPLICA_COMMIT); + phys_duplicate(vma, vma->vm_start, vma->vm_end - vma->vm_start); + } + } + +out: + mmap_write_unlock(mm); +} + +static inline bool replicated_p4d_level(struct vm_fault *vmf) +{ + //TODO Do something better + return mm_p4d_folded(vmf->vma->vm_mm) || vmf->p4d_replicated || pgd_none(*(vmf->pgd)); +} + +static inline bool replicated_pud_level(struct vm_fault *vmf) +{ + //TODO Do something better + /* We don't have entries on this level, or they are not the same*/ + return mm_pud_folded(vmf->vma->vm_mm) || vmf->pud_replicated || p4d_none(*(vmf->p4d)); +} + +static inline bool replicated_pmd_level(struct vm_fault *vmf) +{ + //TODO Do something better + /* We don't have entries on this level, or they are not the same*/ + return mm_pmd_folded(vmf->vma->vm_mm) || vmf->pmd_replicated || pud_none(*(vmf->pud)); +} + +static inline bool replicated_pte_level(struct vm_fault *vmf) +{ + //TODO Do something better + /* We don't have entries on this level, or they are not the same*/ + return vmf->pte_replicated || pmd_none(*(vmf->pmd)); +} + +static inline bool overlap_pmd_entry(unsigned long address, unsigned long left, unsigned long right) +{ + return ((address & PMD_MASK) == (left & PMD_MASK)) || + ((address & PMD_MASK) == (right & PMD_MASK)); +} + +static inline bool overlap_pud_entry(unsigned long address, unsigned long left, unsigned long right) +{ + return ((address & PUD_MASK) == (left & PUD_MASK)) || + ((address & PUD_MASK) == (right & PUD_MASK)); +} + +static inline bool overlap_p4d_entry(unsigned long address, unsigned long left, unsigned long right) +{ + return ((address & P4D_MASK) == (left & P4D_MASK)) || + ((address & P4D_MASK) == (right & P4D_MASK)); +} + +static inline bool overlap_pgd_entry(unsigned long address, unsigned long left, unsigned long right) +{ + return ((address & PGDIR_MASK) == (left & PGDIR_MASK)) || + ((address & PGDIR_MASK) == (right & PGDIR_MASK)); +} + +static inline void get_replicant_neighbours(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long address, unsigned long *left, unsigned long *right) +{ + *left = ULONG_MAX; + *right = ULONG_MAX; + + if (numa_is_vma_replicant(vma)) + *left = *right = address; +} + +static inline void __replication_path_action(struct vm_fault *vmf, bool replicated) +{ + if (vmf->replica_action != REPLICA_NONE) { + /* + * If we meet propagation action again, that means upper + * level has already been propagated and we don't have + * replicas anylower -- we need to completely switch + * to default handling. + */ + if (vmf->replica_action == REPLICA_PROPAGATE) + vmf->replica_action = REPLICA_NONE; + else + vmf->replica_action = replicated ? REPLICA_KEEP : REPLICA_PROPAGATE; + } +} + +static bool replication_path_pgd(struct vm_fault *vmf) +{ + bool p4d_folded = mm_p4d_folded(vmf->vma->vm_mm), replicated; + struct mm_struct *mm = vmf->vma->vm_mm; + unsigned long address = vmf->real_address; + /* There are replicated tables in our pgd entry or there is vma requiring it. Need to replicate next level. + * 5-level paging and folded p4d give us a lot of grief. + * If 5-level paging disabled, handle_mm_fault_pgd function doing nothing, except filling vmf->p4d_numa + * with same values as in vmf->pgd_numa and propagation will not work correctly. + * So we need to go in __handle_mm_fault_p4d_replicant, because we might still want to propagate it. + */ + get_replicant_neighbours(mm, vmf->vma, address, &(vmf->left_replicant), &(vmf->right_replicant)); + if (!p4d_folded) + vmf->p4d_replicated = !pgd_none(*(vmf->pgd)) && + PageReplicated(virt_to_page(pgd_page_vaddr(*vmf->pgd))); + + replicated = p4d_folded || overlap_pgd_entry(address, vmf->left_replicant, vmf->right_replicant) + || vmf->p4d_replicated; + /* + * Here replica_action may be REPLICA_NONE, so we ignore that, + * because we always replicate top level table. + */ + + vmf->replica_action = replicated ? REPLICA_KEEP : REPLICA_PROPAGATE; + return replicated; +} + +static bool replication_path_p4d(struct vm_fault *vmf) +{ + bool pud_folded = mm_pud_folded(vmf->vma->vm_mm), replicated; + unsigned long address = vmf->real_address; + + if (vmf->replica_action == REPLICA_PROPAGATE) { + /* + * We have already propagated upper level, + * so we'll never use XXX_replicated values again + * during this fault. + */ + vmf->replica_action = REPLICA_NONE; + return false; + } + + if (!pud_folded) + vmf->pud_replicated = !p4d_none(*(vmf->p4d)) && + PageReplicated(virt_to_page(p4d_pgtable(*vmf->p4d))); + + replicated = pud_folded || overlap_p4d_entry(address, vmf->left_replicant, vmf->right_replicant) + || vmf->pud_replicated; + + __replication_path_action(vmf, replicated); + return replicated; +} + +static bool replication_path_pud(struct vm_fault *vmf) +{ + bool pmd_folded = mm_pmd_folded(vmf->vma->vm_mm), replicated; + unsigned long address = vmf->real_address; + + if (vmf->replica_action == REPLICA_PROPAGATE) { + /* + * We have already propagated upper level, + * so we'll never use XXX_replicated values again + * during this fault. + */ + vmf->replica_action = REPLICA_NONE; + return false; + } + + if (!pmd_folded) + vmf->pmd_replicated = !pud_none(*(vmf->pud)) && + PageReplicated(virt_to_page(pud_pgtable(*vmf->pud))); + replicated = pmd_folded || overlap_pud_entry(address, vmf->left_replicant, vmf->right_replicant) + || vmf->pmd_replicated; + __replication_path_action(vmf, replicated); + return replicated; +} + +static bool replication_path_pmd(struct vm_fault *vmf) +{ + bool replicated; + unsigned long address = vmf->real_address; + + if (vmf->replica_action == REPLICA_PROPAGATE) { + /* + * We have already propagated upper level, + * so we'll never use XXX_replicated values again + * during this fault. + */ + vmf->replica_action = REPLICA_NONE; + return false; + } + + vmf->pte_replicated = !pmd_none(*(vmf->pmd)) && + PageReplicated(pmd_pgtable(*vmf->pmd)); + replicated = overlap_pmd_entry(address, vmf->left_replicant, vmf->right_replicant) + || vmf->pte_replicated; + __replication_path_action(vmf, replicated); + return replicated; +} + +static void +release_replicated_p4d_tables(int allocated_node, p4d_t **new, struct mm_struct *mm) +{ + int nid; + for_each_memory_node(nid) { + if (nid == allocated_node || new[nid] == NULL) + continue; + p4d_free(mm, new[nid]); + } +} + +static void +release_replicated_pud_tables(int allocated_node, pud_t **new, struct mm_struct *mm) +{ + int nid; + for_each_memory_node(nid) { + if (nid == allocated_node || new[nid] == NULL) + continue; + pud_free(mm, new[nid]); + } +} + +static void +release_replicated_pmd_tables(int allocated_node, pmd_t **new, struct mm_struct *mm) +{ + int nid; + for_each_memory_node(nid) { + if (nid == allocated_node || new[nid] == NULL) + continue; + pmd_free(mm, new[nid]); + } +} + +static void +release_replicated_pte_tables(int allocated_node, struct ptdesc **new, struct mm_struct *mm) +{ + int nid; + for_each_memory_node(nid) { + if (nid == allocated_node || new[nid] == NULL) + continue; + + if (allocated_node == NUMA_NO_NODE) { + ClearPageReplicated(ptdesc_page(new[nid])); + new[nid]->replica_list_node.next = NULL; + } + pte_free(mm, ptdesc_page(new[nid])); + } +} + +static void +sync_replicated_p4d_tables(int allocated_node, p4d_t **new, pgd_t *start_pgd, struct mm_struct *mm) +{ + int nid; + unsigned long offset; + struct ptdesc *curr; + pgd_t *curr_pgd; + bool start; + + for_each_pgtable(curr, curr_pgd, start_pgd, nid, offset, start) { + SetPageReplicated(virt_to_page(new[nid])); + if (nid == allocated_node) + continue; + + if (allocated_node != NUMA_NO_NODE) + copy_page(new[nid], new[allocated_node]); + + smp_wmb(); + pgd_populate(mm, curr_pgd, new[nid]); + } +} + +static void +sync_replicated_pud_tables(int allocated_node, pud_t **new, p4d_t *start_p4d, struct mm_struct *mm) +{ + int nid; + unsigned long offset; + struct ptdesc *curr; + p4d_t *curr_p4d; + bool start; + + /* + * Do not need locking from sync_replicated_pte_tables, + * because pud_lockptr == page_table_lock + */ + + build_pud_chain(new); + set_master_page_for_puds(allocated_node, new); + + for_each_pgtable(curr, curr_p4d, start_p4d, nid, offset, start) { + SetPageReplicated(virt_to_page(new[nid])); + if (nid == allocated_node) + continue; + + if (allocated_node != NUMA_NO_NODE) + copy_page(new[nid], new[allocated_node]); + + mm_inc_nr_puds(mm); + smp_wmb(); + p4d_populate(mm, curr_p4d, new[nid]); + } +} + +static void +sync_replicated_pmd_tables(int allocated_node, pmd_t **new, pud_t *start_pud, struct mm_struct *mm) +{ + int nid; + unsigned long offset; + struct ptdesc *curr; + pud_t *curr_pud; + bool start; + + /* + * Locking here the same as in the sync_replicated_pte_tables + */ + spinlock_t *ptl = NULL; + if (allocated_node != NUMA_NO_NODE) { + ptl = pmd_lockptr(mm, new[allocated_node]); + spin_lock_nested(ptl, 1); + } + + BUILD_BUG_ON(!USE_SPLIT_PMD_PTLOCKS); + + build_pmd_chain(new); + set_master_page_for_pmds(allocated_node, new); + + for_each_pgtable(curr, curr_pud, start_pud, nid, offset, start) { + SetPageReplicated(virt_to_page(new[nid])); + if (nid == allocated_node) + continue; + if (allocated_node != NUMA_NO_NODE) + copy_page(new[nid], new[allocated_node]); + + mm_inc_nr_pmds(mm); + smp_wmb(); + pud_populate(mm, curr_pud, new[nid]); + } + + if (ptl) + spin_unlock(ptl); +} + +#ifdef CONFIG_ARM64 +static void +sync_replicated_pte_tables(int allocated_node, struct ptdesc **new, pmd_t *start_pmd, struct mm_struct *mm) +{ + int nid; + unsigned long offset; + struct ptdesc *curr; + pmd_t *curr_pmd; + bool start; + spinlock_t *ptl = NULL; + + /* Why we need (sometimes) ptl from allocated_node here? + * If replicate existed table, concurrent page fault might + * observe replicated table which content was not copied + * from original table yet. At this point master_locks are + * already set (which is lock from original table), so we + * need to hold it here. + * + * Obviously, if there was no any table before, + * we do not need to hold any pte lock at all, everything will be propagated + * correctly via replica_list + */ + BUILD_BUG_ON(!USE_SPLIT_PTE_PTLOCKS); + + if (allocated_node != NUMA_NO_NODE) { + ptl = ptlock_ptr(new[allocated_node]); + spin_lock_nested(ptl, 1); + + build_pte_chain(new); + set_master_page_for_ptes(allocated_node, new); + + for_each_memory_node(nid) { + SetPageReplicated(ptdesc_page(new[nid])); + if (nid == allocated_node) + continue; + copy_page(ptdesc_to_virt(new[nid]), ptdesc_to_virt(new[allocated_node])); + } + } + + smp_wmb(); + + for_each_pgtable(curr, curr_pmd, start_pmd, nid, offset, start) { + /* + * We are safe to set this flag here even for original table, + * because replica list have already been created. + * So, in the case if some propagation will be required, + * we are able to do it, even if not all upper tables are populated yet + */ + if (nid == allocated_node) + continue; + + mm_inc_nr_ptes(mm); + + WRITE_ONCE(*curr_pmd, __pmd(__phys_to_pmd_val(page_to_phys(ptdesc_page(new[nid]))) | + PMD_TYPE_TABLE | PMD_TABLE_AF | PMD_TABLE_PXN)); + } + + dsb(ishst); + isb(); + + if (ptl) + spin_unlock(ptl); +} +#endif + +static int +prepare_replicated_p4d_tables(int allocated_node, p4d_t **new, struct mm_struct *mm, unsigned long address) +{ + int nid; + p4d_t *new_p4d; + bool fail = false; + + for_each_memory_node(nid) { + if (nid == allocated_node) + continue; + new_p4d = p4d_alloc_one_node(nid, mm, address); + + if (unlikely(!new_p4d)) + fail = true; + + new[nid] = new_p4d; + } + + if (unlikely(fail)) { + release_replicated_p4d_tables(allocated_node, new, mm); + return -ENOMEM; + } + + return 0; +} + +static int +prepare_replicated_pud_tables(int allocated_node, pud_t **new, struct mm_struct *mm, unsigned long address) +{ + int nid; + pud_t *new_pud; + bool fail = false; + + for_each_memory_node(nid) { + if (nid == allocated_node) + continue; + new_pud = pud_alloc_one_node(nid, mm, address); + + if (unlikely(!new_pud)) + fail = true; + + new[nid] = new_pud; + } + + if (unlikely(fail)) { + release_replicated_pud_tables(allocated_node, new, mm); + return -ENOMEM; + } + + return 0; +} + +static int +prepare_replicated_pmd_tables(int allocated_node, pmd_t **new, struct mm_struct *mm, unsigned long address) +{ + int nid; + pmd_t *new_pmd; + bool fail = false; + + for_each_memory_node(nid) { + if (nid == allocated_node) + continue; + new_pmd = pmd_alloc_one_node(nid, mm, address); + + if (unlikely(!new_pmd)) + fail = true; + + new[nid] = new_pmd; + } + + if (unlikely(fail)) { + release_replicated_pmd_tables(allocated_node, new, mm); + return -ENOMEM; + } + + return 0; +} + +static int +prepare_replicated_pte_tables(int allocated_node, struct ptdesc **new, struct mm_struct *mm) +{ + int nid; + struct page *new_pte; + bool fail = false; + + for_each_memory_node(nid) { + if (nid == allocated_node) + continue; + new_pte = pte_alloc_one_node(nid, mm); + + if (unlikely(!new_pte)) + fail = true; + + new[nid] = page_ptdesc(new_pte); + } + + if (unlikely(fail)) { + release_replicated_pte_tables(allocated_node, new, mm); + return -ENOMEM; + } + + if (allocated_node == NUMA_NO_NODE) { + build_pte_chain(new); + set_master_page_for_ptes(allocated_node, new); + + for_each_memory_node(nid) { + SetPageReplicated(ptdesc_page(new[nid])); + } + } + + return 0; +} + +static vm_fault_t replication_handle_pgd_fault(struct vm_fault *vmf) +{ + unsigned long address = vmf->real_address; + struct mm_struct *mm = vmf->vma->vm_mm; + + vmf->pgd = pgd_offset_pgd(mm->pgd, address); + + return 0; +} + +/* TODO Need to clarify, how this going to work with and without 5-level paging*/ +static vm_fault_t replication_handle_p4d_fault(struct vm_fault *vmf) +{ + int ret; + p4d_t *p4d_tables[MAX_NUMNODES]; + unsigned long address = vmf->real_address; + struct mm_struct *mm = vmf->vma->vm_mm; + + /* See replication_handle_pgd_fault in mm/numa_replication.c */ + if (replicated_p4d_level(vmf)) { + if (!pgd_none(*vmf->pgd)) { + vmf->p4d = p4d_offset(vmf->pgd, address); + return 0; + } + ret = prepare_replicated_p4d_tables(NUMA_NO_NODE, p4d_tables, mm, address); + if (ret) + goto fault_oom; + + spin_lock(&mm->page_table_lock); + if (pgd_present(*vmf->pgd)) { + /* Someone else has replicated this level */ + BUG_ON(!PageReplicated(virt_to_page(pgd_page_vaddr(*(vmf->pgd))))); + release_replicated_p4d_tables(NUMA_NO_NODE, p4d_tables, mm); + } else + sync_replicated_p4d_tables(NUMA_NO_NODE, p4d_tables, vmf->pgd, mm); + spin_unlock(&mm->page_table_lock); + + } else { + p4d_t *table_page = (p4d_t *)pgd_page_vaddr(*(vmf->pgd)); + int p4d_node = page_to_nid(virt_to_page(table_page)); + + p4d_tables[p4d_node] = table_page; + ret = prepare_replicated_p4d_tables(p4d_node, p4d_tables, mm, address); + if (ret) + goto fault_oom; + + spin_lock(&mm->page_table_lock); + if (PageReplicated(virt_to_page(table_page))) + /* Someone else has replicated this level */ + release_replicated_p4d_tables(p4d_node, p4d_tables, mm); + else + sync_replicated_p4d_tables(p4d_node, p4d_tables, vmf->pgd, mm); + spin_unlock(&mm->page_table_lock); + } + + vmf->p4d = p4d_offset(vmf->pgd, address); + + return 0; + +fault_oom: + vmf->replica_action = REPLICA_FAIL; + return VM_FAULT_OOM; +} + +static vm_fault_t replication_handle_pud_fault(struct vm_fault *vmf) +{ + int ret; + pud_t *pud_tables[MAX_NUMNODES]; + unsigned long address = vmf->real_address; + struct mm_struct *mm = vmf->vma->vm_mm; + + /* See replication_handle_pgd_fault in mm/numa_replication.c */ + if (replicated_pud_level(vmf)) { + if (!p4d_none(*vmf->p4d)) { + vmf->pud = pud_offset(vmf->p4d, address); + return 0; + } + ret = prepare_replicated_pud_tables(NUMA_NO_NODE, pud_tables, mm, address); + if (ret) + goto fault_oom; + + spin_lock(&mm->page_table_lock); + if (p4d_present(*vmf->p4d)) { + /* Someone else has replicated this level */ + BUG_ON(!PageReplicated(virt_to_page(p4d_pgtable(*(vmf->p4d))))); + release_replicated_pud_tables(NUMA_NO_NODE, pud_tables, mm); + } else + sync_replicated_pud_tables(NUMA_NO_NODE, pud_tables, vmf->p4d, mm); + spin_unlock(&mm->page_table_lock); + } else { + pud_t* table_page = p4d_pgtable(*(vmf->p4d)); + int pud_node = page_to_nid(virt_to_page(table_page)); + + pud_tables[pud_node] = table_page; + ret = prepare_replicated_pud_tables(pud_node, pud_tables, mm, address); + if (ret) + goto fault_oom; + + spin_lock(&mm->page_table_lock); + if (PageReplicated(virt_to_page(table_page))) + /* Someone else has replicated this level */ + release_replicated_pud_tables(pud_node, pud_tables, mm); + else + sync_replicated_pud_tables(pud_node, pud_tables, vmf->p4d, mm); + spin_unlock(&mm->page_table_lock); + } + + vmf->pud = pud_offset(vmf->p4d, address); + + return 0; + +fault_oom: + vmf->replica_action = REPLICA_FAIL; + return VM_FAULT_OOM; +} + +static vm_fault_t replication_handle_pmd_fault(struct vm_fault *vmf) +{ + int ret; + pmd_t* pmd_tables[MAX_NUMNODES]; + unsigned long address = vmf->real_address; + struct mm_struct *mm = vmf->vma->vm_mm; + spinlock_t *ptl; + + /* See replication_handle_pgd_fault in mm/numa_replication.c */ + if (replicated_pmd_level(vmf)) { + if (!pud_none(*vmf->pud)) { + vmf->pmd = pmd_offset(vmf->pud, address); + return 0; + } + ret = prepare_replicated_pmd_tables(NUMA_NO_NODE, pmd_tables, mm, address); + if (ret) + goto fault_oom; + + ptl = pud_lock(mm, vmf->pud); + if (pud_present(*vmf->pud)) { + /* Someone else has replicated this level */ + BUG_ON(!PageReplicated(virt_to_page(pud_pgtable(*(vmf->pud))))); + release_replicated_pmd_tables(NUMA_NO_NODE, pmd_tables, mm); + } else + sync_replicated_pmd_tables(NUMA_NO_NODE, pmd_tables, vmf->pud, mm); + spin_unlock(ptl); + } else { + pmd_t* table_page = pud_pgtable(*(vmf->pud)); + int pmd_node = page_to_nid(virt_to_page(table_page)); + + pmd_tables[pmd_node] = table_page; + ret = prepare_replicated_pmd_tables(pmd_node, pmd_tables, mm, address); + if (ret) + goto fault_oom; + + ptl = pud_lock(mm, vmf->pud); + if (PageReplicated(virt_to_page(table_page))) + /* Someone else has replicated this level */ + release_replicated_pmd_tables(pmd_node, pmd_tables, mm); + else + sync_replicated_pmd_tables(pmd_node, pmd_tables, vmf->pud, mm); + spin_unlock(ptl); + } + + vmf->pmd = pmd_offset(vmf->pud, address); + + return 0; + +fault_oom: + vmf->replica_action = REPLICA_FAIL; + return VM_FAULT_OOM; +} + +static vm_fault_t replication_handle_pte_fault(struct vm_fault *vmf) +{ + int ret; + struct mm_struct *mm = vmf->vma->vm_mm; + struct ptdesc* pte_tables[MAX_NUMNODES]; + spinlock_t *ptl; + + if (replicated_pte_level(vmf)) { + /* + * If pmd from 0th node populated and PageReplciated flag is set, + * we don't care whether other nodes are populated or not, + * beacause pgtable lists are already built and we can use them + */ + if (!pmd_none(*vmf->pmd)) + return 0; + ret = prepare_replicated_pte_tables(NUMA_NO_NODE, pte_tables, mm); + if (ret) + goto fault_oom; + ptl = pmd_lock(mm, vmf->pmd); + if (unlikely(pmd_present(*vmf->pmd))) { + /* Someone else has replicated this level */ + BUG_ON(!PageReplicated(pmd_pgtable(*(vmf->pmd)))); + spin_unlock(ptl); + release_replicated_pte_tables(NUMA_NO_NODE, pte_tables, mm); + } else { + sync_replicated_pte_tables(NUMA_NO_NODE, pte_tables, vmf->pmd, mm); + spin_unlock(ptl); + } + } else { + struct page* table_page = pmd_pgtable(*(vmf->pmd)); + int pte_node = page_to_nid(table_page); + + pte_tables[pte_node] = page_ptdesc(table_page); + ret = prepare_replicated_pte_tables(pte_node, pte_tables, mm); + if (ret) + goto fault_oom; + + ptl = pmd_lock(mm, vmf->pmd); + if (unlikely(PageReplicated(table_page))) { + spin_unlock(ptl); + /* Someone else has replicated this level */ + release_replicated_pte_tables(pte_node, pte_tables, mm); + } else { + sync_replicated_pte_tables(pte_node, pte_tables, vmf->pmd, mm); + spin_unlock(ptl); + } + } + + return 0; + +fault_oom: + vmf->replica_action = REPLICA_FAIL; + return VM_FAULT_OOM; +} + +pgd_t *fault_pgd_offset(struct vm_fault *vmf, unsigned long address) +{ + vmf->pgd = pgd_offset_pgd(this_node_pgd(vmf->vma->vm_mm), address); + return vmf->pgd; +} + +p4d_t *fault_p4d_alloc(struct vm_fault *vmf, struct mm_struct *mm, pgd_t *pgd, unsigned long address) +{ + if (replication_path_pgd(vmf)) { + if (replication_handle_p4d_fault(vmf)) + return NULL; + } else { + vmf->p4d = p4d_alloc(mm, pgd, address); + } + + return vmf->p4d; +} + +pud_t *fault_pud_alloc(struct vm_fault *vmf, struct mm_struct *mm, p4d_t *p4d, unsigned long address) +{ + if (vmf->replica_action != REPLICA_NONE && replication_path_p4d(vmf)) { + if (replication_handle_pud_fault(vmf)) + return NULL; + } else { + vmf->pud = pud_alloc(mm, p4d, address); + } + return vmf->pud; +} + +pmd_t *fault_pmd_alloc(struct vm_fault *vmf, struct mm_struct *mm, pud_t *pud, unsigned long address) +{ + if (vmf->replica_action != REPLICA_NONE && replication_path_pud(vmf)) { + if (replication_handle_pmd_fault(vmf)) + return NULL; + } else { + vmf->pmd = pmd_alloc(mm, pud, address); + } + return vmf->pmd; +} + +int fault_pte_alloc(struct vm_fault *vmf) +{ + if (vmf->replica_action != REPLICA_NONE && replication_path_pmd(vmf)) + return replication_handle_pte_fault(vmf); + return 0; +} + +pte_t *cpr_alloc_pte_map_lock(struct mm_struct *dst_mm, unsigned long addr, + pmd_t *src_pmd, pmd_t *dst_pmd, spinlock_t **ptl) +{ + struct ptdesc *pte_tables[MAX_NUMNODES]; + struct page *src_pte = pmd_pgtable(*src_pmd); + spinlock_t *pmd_ptl; + + bool pte_replicated_src = numa_pgtable_replicated(page_to_virt(src_pte)); + bool pmd_replicated_dst = numa_pgtable_replicated(dst_pmd); + + if (memcg_replication_enabled(dst_mm) && pte_replicated_src && pmd_replicated_dst) { + if (!pmd_none(*dst_pmd)) { + return pte_offset_map_lock(dst_mm, dst_pmd, addr, ptl); + } + + if (prepare_replicated_pte_tables(NUMA_NO_NODE, pte_tables, dst_mm)) + return NULL; + + pmd_ptl = pmd_lock(dst_mm, dst_pmd); + sync_replicated_pte_tables(NUMA_NO_NODE, pte_tables, dst_pmd, dst_mm); + spin_unlock(pmd_ptl); + + return pte_offset_map_lock(dst_mm, dst_pmd, addr, ptl); + } + + return pte_alloc_map_lock(dst_mm, dst_pmd, addr, ptl); +} + +pmd_t *cpr_alloc_pmd(struct mm_struct *dst_mm, unsigned long addr, + pud_t *src_pud, pud_t *dst_pud) +{ + pmd_t *pmd_tables[MAX_NUMNODES]; + pmd_t *src_pmd = pud_pgtable(*src_pud); + spinlock_t *ptl; + + bool pmd_replicated_src = numa_pgtable_replicated(src_pmd); + bool pud_replicated_dst = numa_pgtable_replicated(dst_pud); + + if (memcg_replication_enabled(dst_mm) && pmd_replicated_src && pud_replicated_dst) { + if (!pud_none(*dst_pud)) { + return pmd_offset(dst_pud, addr); + } + + if (prepare_replicated_pmd_tables(NUMA_NO_NODE, pmd_tables, dst_mm, addr)) + return NULL; + + ptl = pud_lock(dst_mm, dst_pud); + sync_replicated_pmd_tables(NUMA_NO_NODE, pmd_tables, dst_pud, dst_mm); + spin_unlock(ptl); + + return pmd_offset(dst_pud, addr); + } + + return pmd_alloc(dst_mm, dst_pud, addr); +} + +pud_t *cpr_alloc_pud(struct mm_struct *dst_mm, unsigned long addr, + p4d_t *src_p4d, p4d_t *dst_p4d) +{ +#if CONFIG_PGTABLE_LEVELS >= 4 + pud_t *pud_tables[MAX_NUMNODES]; + pud_t *src_pud = p4d_pgtable(*src_p4d); + + bool pud_replicated_src = numa_pgtable_replicated(src_pud); + bool p4d_replicated_dst = numa_pgtable_replicated(dst_p4d); + + if (memcg_replication_enabled(dst_mm) && pud_replicated_src && p4d_replicated_dst) { + if (!p4d_none(*dst_p4d)) { + return pud_offset(dst_p4d, addr); + } + + if (prepare_replicated_pud_tables(NUMA_NO_NODE, pud_tables, dst_mm, addr)) + return NULL; + + spin_lock(&dst_mm->page_table_lock); + sync_replicated_pud_tables(NUMA_NO_NODE, pud_tables, dst_p4d, dst_mm); + spin_unlock(&dst_mm->page_table_lock); + + return pud_offset(dst_p4d, addr); + } + + return pud_alloc(dst_mm, dst_p4d, addr); +#else + return pud_offset(dst_p4d, addr); +#endif +} + +p4d_t *cpr_alloc_p4d(struct mm_struct *dst_mm, unsigned long addr, + pgd_t *src_pgd, pgd_t *dst_pgd) +{ +#if CONFIG_PGTABLE_LEVELS == 5 + p4d_t *p4d_tables[MAX_NUMNODES]; + p4d_t *src_p4d = pgd_pgtable(*src_pgd); + + bool p4d_replicated_src = numa_pgtable_replicated(src_p4d); + + if (memcg_replication_enabled(dst_mm) && p4d_replicated_src) { + if (!pgd_none(*dst_pgd)) { + return p4d_offset(dst_pgd, addr); + } + if (prepare_replicated_p4d_tables(NUMA_NO_NODE, p4d_tables, dst_mm, addr)) + return NULL; + + spin_lock(&dst_mm->page_table_lock); + sync_replicated_p4d_tables(NUMA_NO_NODE, p4d_tables, dst_pgd, dst_mm); + spin_unlock(&dst_mm->page_table_lock); + + return p4d_offset(dst_pgd, addr); + } + + return p4d_alloc(dst_mm, dst_pgd, addr); +#else + return p4d_offset(dst_pgd, addr); +#endif +} diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d2b1191efa284..146d9276edf4d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -205,6 +205,8 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = { }; EXPORT_SYMBOL(node_states); +nodemask_t __read_mostly replica_nodes = { { [0] = 1UL } }; + gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; /* @@ -3505,7 +3507,8 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, * * The OOM killer may not free memory on a specific node. */ - if (gfp_mask & (__GFP_RETRY_MAYFAIL | __GFP_THISNODE)) + if ((gfp_mask & (__GFP_RETRY_MAYFAIL | __GFP_THISNODE)) && + !(gfp_mask & __GFP_MAYDIE)) goto out; /* The OOM killer does not needlessly kill tasks for lowmem */ if (ac->highest_zoneidx < ZONE_NORMAL) @@ -4731,7 +4734,8 @@ static inline bool check_after_alloc(gfp_t *gfp, unsigned int order, return true; } - if (*gfp & (__GFP_NORETRY | __GFP_RETRY_MAYFAIL | __GFP_THISNODE)) + if ((*gfp & (__GFP_NORETRY | __GFP_RETRY_MAYFAIL | __GFP_THISNODE)) && + !(*gfp & __GFP_MAYDIE)) goto out; /* Coredumps can quickly deplete all memory reserves */ diff --git a/mm/page_idle.c b/mm/page_idle.c index 41ea77f22011e..cebc1897b12e3 100644 --- a/mm/page_idle.c +++ b/mm/page_idle.c @@ -12,6 +12,7 @@ #include <linux/mmu_notifier.h> #include <linux/page_ext.h> #include <linux/page_idle.h> +#include <linux/numa_user_replication.h> #include "internal.h" @@ -63,7 +64,7 @@ static bool page_idle_clear_pte_refs_one(struct folio *folio, * For PTE-mapped THP, one sub page is referenced, * the whole THP is referenced. */ - if (ptep_clear_young_notify(vma, addr, pvmw.pte)) + if (ptep_clear_young_notify_replicated(vma, addr, pvmw.pte)) referenced = true; } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { if (pmdp_clear_young_notify(vma, addr, pvmw.pmd)) diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index 74d2de15fb5e0..995db39afa955 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -4,6 +4,7 @@ #include <linux/hugetlb.h> #include <linux/swap.h> #include <linux/swapops.h> +#include <linux/numa_user_replication.h> #include "internal.h" @@ -211,7 +212,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw) goto next_pte; restart: do { - pgd = pgd_offset(mm, pvmw->address); + pgd = pgd_offset_pgd(this_node_pgd(mm), pvmw->address); if (!pgd_present(*pgd)) { step_forward(pvmw, PGDIR_SIZE); continue; diff --git a/mm/rmap.c b/mm/rmap.c index 86353d274d437..f072b411219ef 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -75,6 +75,7 @@ #include <linux/memremap.h> #include <linux/userfaultfd_k.h> #include <linux/mm_inline.h> +#include <linux/numa_user_replication.h> #include <asm/tlbflush.h> @@ -843,7 +844,7 @@ static bool folio_referenced_one(struct folio *folio, referenced++; } - if (ptep_clear_flush_young_notify(vma, address, + if (ptep_clear_flush_young_notify_replicated(vma, address, pvmw.pte)) referenced++; } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { @@ -992,10 +993,10 @@ static int page_vma_mkclean_one(struct page_vma_mapped_walk *pvmw) continue; flush_cache_page(vma, address, pte_pfn(entry)); - entry = ptep_clear_flush(vma, address, pte); + entry = ptep_clear_flush_replicated(vma, address, pte); entry = pte_wrprotect(entry); entry = pte_mkclean(entry); - set_pte_at(vma->vm_mm, address, pte, entry); + set_pte_at_replicated(vma->vm_mm, address, pte, entry); ret = 1; } else { #ifdef CONFIG_TRANSPARENT_HUGEPAGE @@ -1744,11 +1745,11 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, * transition on a cached TLB entry is written through * and traps if the PTE is unmapped. */ - pteval = ptep_get_and_clear(mm, address, pvmw.pte); + pteval = ptep_get_and_clear_replicated(mm, address, pvmw.pte); set_tlb_ubc_flush_pending(mm, pteval, address); } else { - pteval = ptep_clear_flush(vma, address, pvmw.pte); + pteval = ptep_clear_flush_replicated(vma, address, pvmw.pte); } } @@ -1775,7 +1776,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, } else { dec_mm_counter(mm, mm_counter(folio)); add_reliable_folio_counter(folio, mm, -1); - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); } } else if (pte_unused(pteval) && !userfaultfd_armed(vma)) { @@ -1839,18 +1840,18 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, * If the folio was redirtied, it cannot be * discarded. Remap the page to page table. */ - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); folio_set_swapbacked(folio); goto walk_abort; } if (swap_duplicate(entry) < 0) { - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); goto walk_abort; } if (arch_unmap_one(mm, vma, address, pteval) < 0) { swap_free(entry); - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); goto walk_abort; } @@ -1858,7 +1859,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, if (anon_exclusive && folio_try_share_anon_rmap_pte(folio, subpage)) { swap_free(entry); - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); goto walk_abort; } if (list_empty(&mm->mmlist)) { @@ -1877,7 +1878,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, swp_pte = pte_swp_mksoft_dirty(swp_pte); if (pte_uffd_wp(pteval)) swp_pte = pte_swp_mkuffd_wp(swp_pte); - set_pte_at(mm, address, pvmw.pte, swp_pte); + set_pte_at_replicated(mm, address, pvmw.pte, swp_pte); } else { /* * This is a locked file-backed folio, @@ -2115,11 +2116,11 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, * transition on a cached TLB entry is written through * and traps if the PTE is unmapped. */ - pteval = ptep_get_and_clear(mm, address, pvmw.pte); + pteval = ptep_get_and_clear_replicated(mm, address, pvmw.pte); set_tlb_ubc_flush_pending(mm, pteval, address); } else { - pteval = ptep_clear_flush(vma, address, pvmw.pte); + pteval = ptep_clear_flush_replicated(vma, address, pvmw.pte); } } @@ -2161,7 +2162,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, swp_pte = pte_swp_mksoft_dirty(swp_pte); if (pte_swp_uffd_wp(pteval)) swp_pte = pte_swp_mkuffd_wp(swp_pte); - set_pte_at(mm, pvmw.address, pvmw.pte, swp_pte); + set_pte_at_replicated(mm, pvmw.address, pvmw.pte, swp_pte); trace_set_migration_pte(pvmw.address, pte_val(swp_pte), compound_order(&folio->page)); /* @@ -2177,7 +2178,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, } else { dec_mm_counter(mm, mm_counter(folio)); add_reliable_folio_counter(folio, mm, -1); - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); } } else if (pte_unused(pteval) && !userfaultfd_armed(vma)) { @@ -2202,7 +2203,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, set_huge_pte_at(mm, address, pvmw.pte, pteval, hsz); else - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); ret = false; page_vma_mapped_walk_done(&pvmw); break; @@ -2222,7 +2223,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, } } else if (anon_exclusive && folio_try_share_anon_rmap_pte(folio, subpage)) { - set_pte_at(mm, address, pvmw.pte, pteval); + set_pte_at_replicated(mm, address, pvmw.pte, pteval); ret = false; page_vma_mapped_walk_done(&pvmw); break; @@ -2255,7 +2256,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, set_huge_pte_at(mm, address, pvmw.pte, swp_pte, hsz); else - set_pte_at(mm, address, pvmw.pte, swp_pte); + set_pte_at_replicated(mm, address, pvmw.pte, swp_pte); trace_set_migration_pte(address, pte_val(swp_pte), compound_order(&folio->page)); /* @@ -2369,7 +2370,7 @@ static bool page_make_device_exclusive_one(struct folio *folio, /* Nuke the page table entry. */ flush_cache_page(vma, address, pte_pfn(ptent)); - pteval = ptep_clear_flush(vma, address, pvmw.pte); + pteval = ptep_clear_flush_replicated(vma, address, pvmw.pte); /* Set the dirty flag on the folio now the pte is gone. */ if (pte_dirty(pteval)) @@ -2400,7 +2401,7 @@ static bool page_make_device_exclusive_one(struct folio *folio, if (pte_uffd_wp(pteval)) swp_pte = pte_swp_mkuffd_wp(swp_pte); - set_pte_at(mm, address, pvmw.pte, swp_pte); + set_pte_at_replicated(mm, address, pvmw.pte, swp_pte); /* * There is a reference on the page for the swap entry which has diff --git a/mm/swap.c b/mm/swap.c index 9bc530395949b..7dcdfbf6913ed 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -114,6 +114,8 @@ static void page_cache_release(struct folio *folio) void __folio_put(struct folio *folio) { + ClearPageReplicated(folio_page(folio, 0)); + if (unlikely(folio_is_zone_device(folio))) { free_zone_device_folio(folio); return; @@ -1000,13 +1002,16 @@ void folios_put_refs(struct folio_batch *folios, unsigned int *refs) } if (put_devmap_managed_page_refs(&folio->page, nr_refs)) continue; - if (folio_ref_sub_and_test(folio, nr_refs)) + if (folio_ref_sub_and_test(folio, nr_refs)) { + ClearPageReplicated(folio_page(folio, 0)); free_zone_device_folio(folio); + } continue; } if (!folio_ref_sub_and_test(folio, nr_refs)) continue; + ClearPageReplicated(folio_page(folio, 0)); /* hugetlb has its own memcg */ if (folio_test_hugetlb(folio)) { diff --git a/mm/swapfile.c b/mm/swapfile.c index 3af5b6ebb2412..4d87dcd43719f 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -42,6 +42,7 @@ #include <linux/completion.h> #include <linux/suspend.h> #include <linux/zswap.h> +#include <linux/numa_user_replication.h> #include <asm/tlbflush.h> #include <linux/swapops.h> @@ -2015,7 +2016,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd, if (pte_swp_uffd_wp(old_pte)) new_pte = pte_mkuffd_wp(new_pte); setpte: - set_pte_at(vma->vm_mm, addr, pte, new_pte); + set_pte_at_replicated(vma->vm_mm, addr, pte, new_pte); swap_free(entry); out: if (pte) diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 2c71a269a52c6..e25964e4d4700 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -16,6 +16,7 @@ #include <linux/hugetlb.h> #include <linux/shmem_fs.h> #include <linux/userswap.h> +#include <linux/numa_user_replication.h> #include <asm/tlbflush.h> #include <asm/tlb.h> #include "internal.h" @@ -127,7 +128,7 @@ int mfill_atomic_install_pte(pmd_t *dst_pmd, */ inc_mm_counter(dst_mm, mm_counter(folio)); - set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte); + set_pte_at_replicated(dst_mm, dst_addr, dst_pte, _dst_pte); /* No need to invalidate - it was non-present before */ update_mmu_cache(dst_vma, dst_addr, dst_pte); @@ -270,7 +271,7 @@ static int mfill_atomic_pte_zeropage(pmd_t *dst_pmd, ret = -EEXIST; if (!pte_none(ptep_get(dst_pte))) goto out_unlock; - set_pte_at(dst_vma->vm_mm, dst_addr, dst_pte, _dst_pte); + set_pte_at_replicated(dst_vma->vm_mm, dst_addr, dst_pte, _dst_pte); /* No need to invalidate - it was non-present before */ update_mmu_cache(dst_vma, dst_addr, dst_pte); ret = 0; @@ -351,7 +352,7 @@ static int mfill_atomic_pte_poison(pmd_t *dst_pmd, if (!pte_none(ptep_get(dst_pte))) goto out_unlock; - set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte); + set_pte_at_replicated(dst_mm, dst_addr, dst_pte, _dst_pte); /* No need to invalidate - it was non-present before */ update_mmu_cache(dst_vma, dst_addr, dst_pte); diff --git a/mm/userswap.c b/mm/userswap.c index 22e3f147ce5f9..749e6bd940853 100644 --- a/mm/userswap.c +++ b/mm/userswap.c @@ -11,6 +11,7 @@ #include <linux/mmu_notifier.h> #include <linux/hugetlb.h> #include <linux/userswap.h> +#include <linux/numa_user_replication.h> #include "internal.h" @@ -154,11 +155,11 @@ static int uswap_unmap_anon_page(struct mm_struct *mm, goto out_release_unlock; } flush_cache_page(vma, addr, pte_pfn(*pte)); - _old_pte = ptep_clear_flush(vma, addr, pte); + _old_pte = ptep_clear_flush_replicated(vma, addr, pte); if (old_pte) *old_pte = _old_pte; if (set_to_swp) - set_pte_at(mm, addr, pte, swp_entry_to_pte(swp_entry( + set_pte_at_replicated(mm, addr, pte, swp_entry_to_pte(swp_entry( SWP_USERSWAP_ENTRY, page_to_pfn(page)))); dec_mm_counter(mm, MM_ANONPAGES); @@ -198,7 +199,7 @@ static unsigned long vm_insert_anon_page(struct vm_area_struct *vma, dst_pte = mk_pte(page, vma->vm_page_prot); if (vma->vm_flags & VM_WRITE) dst_pte = pte_mkwrite_novma(pte_mkdirty(dst_pte)); - set_pte_at(mm, addr, pte, dst_pte); + set_pte_at_replicated(mm, addr, pte, dst_pte); out_unlock: pte_unmap_unlock(pte, ptl); @@ -217,7 +218,7 @@ static void uswap_map_anon_page(struct mm_struct *mm, pte = pte_offset_map_lock(mm, pmd, addr, &ptl); flush_cache_page(vma, addr, pte_pfn(*pte)); - set_pte_at(mm, addr, pte, old_pte); + set_pte_at_replicated(mm, addr, pte, old_pte); inc_mm_counter(mm, MM_ANONPAGES); add_reliable_page_counter(page, mm, 1); folio_add_new_anon_rmap(page_folio(page), vma, addr, RMAP_EXCLUSIVE); @@ -536,7 +537,7 @@ int mfill_atomic_pte_nocopy(struct mm_struct *mm, pmd_t *dst_pmd, inc_mm_counter(mm, MM_ANONPAGES); add_reliable_page_counter(page, mm, 1); folio_add_new_anon_rmap(page_folio(page), dst_vma, dst_addr, RMAP_EXCLUSIVE); - set_pte_at(mm, dst_addr, pte, dst_pte); + set_pte_at_replicated(mm, dst_addr, pte, dst_pte); /* No need to invalidate - it was non-present before */ update_mmu_cache(dst_vma, dst_addr, pte); -- 2.34.1
反馈： 您发送到kernel@openeuler.org的补丁/补丁集，已成功转换为PR！ PR链接地址： https://atomgit.com/openeuler/kernel/merge_requests/19842 邮件列表地址：https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/NZW... FeedBack: The patch(es) which you have sent to kernel@openeuler.org mailing list has been converted to a pull request successfully! Pull request link: https://atomgit.com/openeuler/kernel/merge_requests/19842 Mailing list address: https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/NZW...
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