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[PATCH OLK-6.6] PCI: vmd: Make vmd_dev::cfg_lock a raw_spinlock_t type
by Qi Xi 22 May '25

22 May '25

From: Ryo Takakura <ryotkkr98(a)gmail.com> mainline inclusion from mainline-v6.15-rc1 commit 18056a48669a040bef491e63b25896561ee14d90 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IC5BIT CVE: CVE-2025-23161 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- The access to the PCI config space via pci_ops::read and pci_ops::write is a low-level hardware access. The functions can be accessed with disabled interrupts even on PREEMPT_RT. The pci_lock is a raw_spinlock_t for this purpose. A spinlock_t becomes a sleeping lock on PREEMPT_RT, so it cannot be acquired with disabled interrupts. The vmd_dev::cfg_lock is accessed in the same context as the pci_lock. Make vmd_dev::cfg_lock a raw_spinlock_t type so it can be used with interrupts disabled. This was reported as: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 Call Trace: rt_spin_lock+0x4e/0x130 vmd_pci_read+0x8d/0x100 [vmd] pci_user_read_config_byte+0x6f/0xe0 pci_read_config+0xfe/0x290 sysfs_kf_bin_read+0x68/0x90 Signed-off-by: Ryo Takakura <ryotkkr98(a)gmail.com> Tested-by: Luis Claudio R. Goncalves <lgoncalv(a)redhat.com> Acked-by: Luis Claudio R. Goncalves <lgoncalv(a)redhat.com> [bigeasy: reword commit message] Signed-off-by: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> Tested-off-by: Luis Claudio R. Goncalves <lgoncalv(a)redhat.com> Link: https://lore.kernel.org/r/20250218080830.ufw3IgyX@linutronix.de [kwilczynski: commit log] Signed-off-by: Krzysztof Wilczyński <kwilczynski(a)kernel.org> [bhelgaas: add back report info from https://lore.kernel.org/lkml/20241218115951.83062-1-ryotkkr98@gmail.com/] Signed-off-by: Bjorn Helgaas <bhelgaas(a)google.com> Signed-off-by: Qi Xi <xiqi2(a)huawei.com> --- drivers/pci/controller/vmd.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 5ff2066aa516..dfa222e02c4d 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -125,7 +125,7 @@ struct vmd_irq_list { struct vmd_dev { struct pci_dev *dev; - spinlock_t cfg_lock; + raw_spinlock_t cfg_lock; void __iomem *cfgbar; int msix_count; @@ -402,7 +402,7 @@ static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg, if (!addr) return -EFAULT; - spin_lock_irqsave(&vmd->cfg_lock, flags); + raw_spin_lock_irqsave(&vmd->cfg_lock, flags); switch (len) { case 1: *value = readb(addr); @@ -417,7 +417,7 @@ static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg, ret = -EINVAL; break; } - spin_unlock_irqrestore(&vmd->cfg_lock, flags); + raw_spin_unlock_irqrestore(&vmd->cfg_lock, flags); return ret; } @@ -437,7 +437,7 @@ static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg, if (!addr) return -EFAULT; - spin_lock_irqsave(&vmd->cfg_lock, flags); + raw_spin_lock_irqsave(&vmd->cfg_lock, flags); switch (len) { case 1: writeb(value, addr); @@ -455,7 +455,7 @@ static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg, ret = -EINVAL; break; } - spin_unlock_irqrestore(&vmd->cfg_lock, flags); + raw_spin_unlock_irqrestore(&vmd->cfg_lock, flags); return ret; } @@ -1020,7 +1020,7 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) if (features & VMD_FEAT_OFFSET_FIRST_VECTOR) vmd->first_vec = 1; - spin_lock_init(&vmd->cfg_lock); + raw_spin_lock_init(&vmd->cfg_lock); pci_set_drvdata(dev, vmd); err = vmd_enable_domain(vmd, features); if (err) -- 2.33.0

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[PATCH OLK-6.6 0/1] CVE-2025-37970
by Hongbo Li 22 May '25

22 May '25

Fix CVE-2025-37970. Silvano Seva (1): iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_fifo drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 3 +++ 1 file changed, 3 insertions(+) -- 2.34.1

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[PATCH OLK-5.10 v2 0/9] arm64: Support xcall prefetch
by Jinjie Ruan 22 May '25

22 May '25

Support xcall prefetch. Changes in v2: - Upadte the xcall prefetch state machine, remove the queued state and add prefetch, cancel states. - Remove the pfi lock and use atomic variables. - Change the 'xcall select' semantics and simplify the code a lot. - Remove keep_running, remove unrelated code. - Remove the count in struct read_cache_entry, and use percpu hit/miss count. - Remove sync mode, so remove struct read_cache_entry in struct task_struct. - Use hash table to find prefetch item for a file, which will not change the file struct KABI. - Use rwlock instead of spinlock for hash table. - Use alloc_page() instead kmalloc() to align 4KB. - Update the commit message. Jinjie Ruan (5): arm64: Introduce Xint software solution arm64: Add debugfs dir for xint eventpoll: xcall: Support async prefetch data in epoll xcall: Add /proc/xcall/stats dir for performance tuning xcall: eventpoll: add tracepoint Liao Chen (1): revert kpti bypass Yipeng Zou (3): arm64: Introduce xcall a faster svc exception handling arm64: Faster SVC exception handler with xcall xcall: Introduce xcall_select to mark special syscall arch/Kconfig | 64 ++++++ arch/arm64/Kconfig | 2 + arch/arm64/configs/openeuler_defconfig | 4 + arch/arm64/include/asm/cpucaps.h | 2 + arch/arm64/include/asm/exception.h | 3 + arch/arm64/kernel/asm-offsets.c | 3 + arch/arm64/kernel/cpufeature.c | 54 +++++ arch/arm64/kernel/entry-common.c | 22 ++ arch/arm64/kernel/entry.S | 183 ++++++++++++++++- arch/arm64/kernel/syscall.c | 57 ++++++ drivers/irqchip/irq-gic-v3.c | 123 +++++++++++ fs/eventpoll.c | 272 +++++++++++++++++++++++++ fs/open.c | 2 + fs/proc/base.c | 207 +++++++++++++++++++ fs/read_write.c | 29 +++ include/linux/fs.h | 46 +++++ include/linux/hardirq.h | 5 + include/linux/irqchip/arm-gic-v3.h | 13 ++ include/linux/sched.h | 5 + include/trace/events/fs.h | 93 +++++++++ kernel/fork.c | 32 +++ kernel/irq/debugfs.c | 33 +++ kernel/irq/internals.h | 18 ++ kernel/irq/irqdesc.c | 19 ++ kernel/irq/proc.c | 10 + kernel/softirq.c | 73 +++++++ kernel/sysctl.c | 36 ++++ 27 files changed, 1408 insertions(+), 2 deletions(-) -- 2.34.1

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[PATCH OLK-6.6 v4 00/11] IPIV-BUGFIX for HIP12
by Jinqian Yang 22 May '25

22 May '25

Compared with the previous IPIV, the IPIV-BUGFIX has the following changes: 1. Use Kconfig to Control whether to enable IPIV. 2. Users use ioctl to control whether to enable IPIV. 3. Use the SMCCC interface for Guest OS to control whether to enable IPIV. 4. ensure that enable_ipiv_from_guest are the same before and after live migration 5. make sure vcpu_id == vcpu_idx. 6. the MPIDR cannot be changed When IPIV is enabled. 7. fix bug that ipiv enable is displayed on the host when "kvm-arm.vgic_v4_enable=0 kvm-arm.ipiv_enabled=1" is configured. 8. Add Exception Printing Jinqian Yang (5): arm64/config: add config to control whether enable IPIV feature KVM: arm64: fix live migration bug of IPIv KVM: arm64: using kvm_vgic_global_state for ipiv kvm: hisi: print error for IPIV arm64/kabi: use KABI_EXTEND to skip KABI check Zhou Wang (6): KVM: arm64: Introduce ipiv enable ioctl KVM: arm64: Document PV-sgi interface KVM: arm64: Implement PV_SGI related calls irqchip/gic: Add HiSilicon PV SGI support kvm: hisi: make sure vcpu_id and vcpu_idx have same value in IPIv kvm: hisi: Don't allow to change mpidr in IPIv Documentation/virt/kvm/arm/hypercalls.rst | 4 ++ Documentation/virt/kvm/arm/pvsgi.rst | 33 ++++++++++++++ arch/arm64/Kconfig | 13 ++++++ arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/include/asm/kvm_host.h | 3 ++ arch/arm64/include/uapi/asm/kvm.h | 5 +++ arch/arm64/kvm/arm.c | 37 +++++++++++---- arch/arm64/kvm/hisilicon/hisi_virt.c | 32 ++++++++++++- arch/arm64/kvm/hisilicon/hisi_virt.h | 20 +++++++-- arch/arm64/kvm/hypercalls.c | 26 +++++++++++ arch/arm64/kvm/sys_regs.c | 34 +++++++++----- arch/arm64/kvm/vgic/vgic-init.c | 42 ++++++++++++++--- arch/arm64/kvm/vgic/vgic-its.c | 28 ++++++++++++ arch/arm64/kvm/vgic/vgic-mmio-v3.c | 1 - drivers/irqchip/irq-gic-v3-its.c | 50 ++++++++++++++------- drivers/irqchip/irq-gic-v3.c | 55 ++++++++++++++++++----- include/linux/arm-smccc.h | 15 +++++++ include/linux/irqchip/arm-gic-v3.h | 10 +++++ include/linux/irqchip/arm-gic-v4.h | 5 ++- include/uapi/linux/kvm.h | 2 +- 20 files changed, 358 insertions(+), 58 deletions(-) create mode 100644 Documentation/virt/kvm/arm/pvsgi.rst -- 2.33.0

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[PATCH OLK-6.6 v6 00/67] Add FUSE Passthrough Support
by Yifan Qiao 22 May '25

22 May '25

Changes since v5: - Add CONFIG_FS_STACK=y to openeuler_defconfig for arm64 and x86 Changes since v4: - Since there is no kabi changes, do not use kabi reserve in fuse structs. - Add CONFIG_FUSE_PASSTHROUGH=y to openeuler_defconfig for arm64 and x86 in a seperate commit Changes since v3: - Fix potential deadlock of callers of direct_splice_actor Changes since v2: - Add CONFIG_FUSE_PASSTHROUGH=y to openeuler_defconfig for x86 Changes since v1: - Add CONFIG_FUSE_PASSTHROUGH=y to openeuler_defconfig for arm64 Amir Goldstein (60): fs: rename __mnt_{want,drop}_write*() helpers fs: export mnt_{get,put}_write_access() to modules fuse: factor out helper fuse_truncate_update_attr() fuse: allocate ff->release_args only if release is needed fuse: break up fuse_open_common() fuse: prepare for failing open response fuse: introduce inode io modes fuse: allow parallel dio writes with FUSE_DIRECT_IO_ALLOW_MMAP ovl: use simpler function to convert iocb to rw flags ovl: propagate IOCB_APPEND flag on writes to realfile ovl: punt write aio completion to workqueue ovl: protect copying of realinode attributes to ovl inode fs: get mnt_writers count for an open backing file's real path fs: create helper file_user_path() for user displayed mapped file path fs: store real path instead of fake path in backing file f_path ovl: add helper ovl_file_modified() ovl: split ovl_want_write() into two helpers ovl: reorder ovl_want_write() after ovl_inode_lock() ovl: do not open/llseek lower file with upper sb_writers held ovl: do not encode lower fh with upper sb_writers held ovl: add permission hooks outside of do_splice_direct() splice: remove permission hook from do_splice_direct() splice: move permission hook out of splice_direct_to_actor() splice: move permission hook out of splice_file_to_pipe() splice: remove permission hook from iter_file_splice_write() remap_range: move permission hooks out of do_clone_file_range() remap_range: move file_start_write() to after permission hook btrfs: move file_start_write() to after permission hook coda: change locking order in coda_file_write_iter() fs: move file_start_write() into vfs_iter_write() fs: move permission hook out of do_iter_write() fs: move permission hook out of do_iter_read() fs: move kiocb_start_write() into vfs_iocb_iter_write() fs: create __sb_write_started() helper fs: create file_write_started() helper fs: create {sb,file}_write_not_started() helpers fs: prepare for stackable filesystems backing file helpers fs: factor out backing_file_{read,write}_iter() helpers fs: factor out backing_file_splice_{read,write}() helpers fs: factor out backing_file_mmap() helper fuse: factor out helper for FUSE_DEV_IOC_CLONE fuse: introduce FUSE_PASSTHROUGH capability fuse: implement ioctls to manage backing files fuse: prepare for opening file in passthrough mode fuse: implement open in passthrough mode fuse: implement read/write passthrough fuse: implement splice read/write passthrough fuse: implement passthrough for mmap fuse: fix wrong ff->iomode state changes from parallel dio write fuse: fix parallel dio write on file open in passthrough mode fuse: verify zero padding in fuse_backing_map fuse: respect FOPEN_KEEP_CACHE on opendir ovl: fix dentry reference leak after changes to underlying layers ovl: relax WARN_ON in ovl_verify_area() remap_range: merge do_clone_file_range() into vfs_clone_file_range() fs: pass offset and result to backing_file end_write() callback fuse: update inode size after extending passthrough write fs: fork splice_file_range() from do_splice_direct() fs: move file_start_write() into direct_splice_actor() fs: use do_splice_direct() for nfsd/ksmbd server-side-copy Bernd Schubert (3): fuse: create helper function if DIO write needs exclusive lock fuse: add fuse_dio_lock/unlock helper functions fuse: disable the combination of passthrough and writeback cache Ed Tsai (1): backing-file: convert to using fops->splice_write Vegard Nossum (1): fs: fix __sb_write_started() kerneldoc formatting Yifan Qiao (1): fuse: config: enable CONFIG_FUSE_PASSTHROUGH and CONFIG_FS_STACK for arm64 and x86 yangyun (1): fuse: use exclusive lock when FUSE_I_CACHE_IO_MODE is set fs/fuse/fuse_i.h | 146 +++++++++- fs/internal.h | 21 +- fs/overlayfs/overlayfs.h | 38 ++- include/linux/backing-file.h | 42 +++ include/linux/fs.h | 91 +++++-- include/linux/fsnotify.h | 3 +- include/linux/mount.h | 4 +- include/linux/splice.h | 13 +- include/uapi/linux/fuse.h | 23 +- arch/arc/kernel/troubleshoot.c | 6 +- drivers/block/loop.c | 2 - drivers/target/target_core_file.c | 10 +- fs/backing-file.c | 339 +++++++++++++++++++++++ fs/btrfs/ioctl.c | 12 +- fs/cachefiles/io.c | 5 +- fs/ceph/file.c | 9 +- fs/coda/file.c | 2 - fs/file_table.c | 12 +- fs/fuse/dev.c | 98 +++++-- fs/fuse/dir.c | 49 +++- fs/fuse/file.c | 362 +++++++++++++++++-------- fs/fuse/inode.c | 37 +++ fs/fuse/iomode.c | 276 +++++++++++++++++++ fs/fuse/passthrough.c | 355 ++++++++++++++++++++++++ fs/inode.c | 8 +- fs/namespace.c | 36 +-- fs/nfsd/vfs.c | 7 +- fs/open.c | 70 ++--- fs/overlayfs/copy_up.c | 166 ++++++++---- fs/overlayfs/dir.c | 60 ++-- fs/overlayfs/export.c | 7 +- fs/overlayfs/file.c | 230 ++++------------ fs/overlayfs/inode.c | 57 ++-- fs/overlayfs/namei.c | 37 ++- fs/overlayfs/super.c | 47 ++-- fs/overlayfs/util.c | 75 ++++- fs/proc/base.c | 2 +- fs/proc/nommu.c | 2 +- fs/proc/task_mmu.c | 4 +- fs/proc/task_nommu.c | 2 +- fs/read_write.c | 199 ++++++++------ fs/remap_range.c | 44 ++- fs/splice.c | 168 ++++++++---- fs/super.c | 1 + kernel/acct.c | 4 +- kernel/trace/trace_output.c | 2 +- MAINTAINERS | 9 + arch/arm64/configs/openeuler_defconfig | 3 +- arch/x86/configs/openeuler_defconfig | 3 +- fs/Kconfig | 4 + fs/Makefile | 1 + fs/fuse/Kconfig | 11 + fs/fuse/Makefile | 2 + fs/overlayfs/Kconfig | 1 + 54 files changed, 2396 insertions(+), 821 deletions(-) create mode 100644 include/linux/backing-file.h create mode 100644 fs/backing-file.c create mode 100644 fs/fuse/iomode.c create mode 100644 fs/fuse/passthrough.c -- 2.39.2

2 68

[PATCH OLK-6.6] mm: remove unnecessary calls to lru_add_drain
by Chen Ridong 22 May '25

22 May '25

From: Rik van Riel <riel(a)surriel.com> mainline inclusion from mainline-v6.14-rc1 commit 1aa43598c03b71d945f8b12d6d579f0ad836f8f8 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC916E Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… ---------------------------------------------------------------------- There seem to be several categories of calls to lru_add_drain and lru_add_drain_all. The first are code paths that recently allocated, swapped in, or otherwise processed a batch of pages, and want them all on the LRU. These drain pages that were recently allocated, probably on the local CPU. A second category are code paths that are actively trying to reclaim, migrate, or offline memory. These often use lru_add_drain_all, to drain the caches on all CPUs. However, there also seem to be some other callers where we aren't really doing either. They are calling lru_add_drain(), despite operating on pages that may have been allocated long ago, and quite possibly on different CPUs. Those calls are not likely to be effective at anything but creating lock contention on the LRU locks. Remove the lru_add_drain calls in the latter category. For detailed reasoning, see [1] and [2]. Link: https://lkml.kernel.org/r/dca2824e8e88e826c6b260a831d79089b5b9c79d.camel@su… [1] Link: https://lkml.kernel.org/r/xxfhcjaq2xxcl5adastz5omkytenq7izo2e5f4q7e3ns4z6lk… [2] Link: https://lkml.kernel.org/r/20241219153253.3da9e8aa@fangorn Signed-off-by: Rik van Riel <riel(a)surriel.com> Suggested-by: David Hildenbrand <david(a)redhat.com> Acked-by: Shakeel Butt <shakeel.butt(a)linux.dev> Acked-by: David Hildenbrand <david(a)redhat.com> Acked-by: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Chris Li <chrisl(a)kernel.org> Cc: Matthew Wilcox (Oracle) <willy(a)infradead.org> Cc: Ryan Roberts <ryan.roberts(a)arm.com> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Conflicts: mm/mmap.c mm/vma.c [vma.c, unmap_region belongs to in the mainline, is not factored out. shift_arg_pages was replaced by relocate_vma_down. vms_clear_ptes was not introduced until 6.12.] Signed-off-by: Chen Ridong <chenridong(a)huawei.com> --- fs/exec.c | 1 - mm/memory.c | 1 - mm/mmap.c | 2 -- mm/swap_state.c | 1 - 4 files changed, 5 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index eaec57f79aa19..2ac3ef80628f0 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -714,7 +714,6 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift) vma, new_start, length, false)) return -ENOMEM; - lru_add_drain(); tlb_gather_mmu(&tlb, mm); next = vma_next(&vmi); if (new_end > old_start) { diff --git a/mm/memory.c b/mm/memory.c index a25c60fdeab89..25c501c1aa713 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1929,7 +1929,6 @@ void zap_page_range_single(struct vm_area_struct *vma, unsigned long address, struct mmu_notifier_range range; struct mmu_gather tlb; - lru_add_drain(); mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm, address, end); hugetlb_zap_begin(vma, &range.start, &range.end); diff --git a/mm/mmap.c b/mm/mmap.c index 4a36526d8caf8..59f410c03f2b2 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2407,7 +2407,6 @@ static void unmap_region(struct mm_struct *mm, struct ma_state *mas, struct mmu_gather tlb; unsigned long mt_start = mas->index; - lru_add_drain(); tlb_gather_mmu(&tlb, mm); update_hiwater_rss(mm); unmap_vmas(&tlb, mas, vma, start, end, tree_end, mm_wr_locked); @@ -3360,7 +3359,6 @@ void exit_mmap(struct mm_struct *mm) goto destroy; } - lru_add_drain(); flush_cache_mm(mm); tlb_gather_mmu_fullmm(&tlb, mm); /* update_hiwater_rss(mm) here? but nobody should be looking */ diff --git a/mm/swap_state.c b/mm/swap_state.c index c574a9ecc6dd5..52b3e5c4d1ade 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -314,7 +314,6 @@ void free_pages_and_swap_cache(struct encoded_page **pages, int nr) struct folio_batch folios; unsigned int refs[PAGEVEC_SIZE]; - lru_add_drain(); folio_batch_init(&folios); for (int i = 0; i < nr; i++) { struct folio *folio = page_folio(encoded_page_ptr(pages[i])); -- 2.34.1

2 1

[PATCH OLK-6.6] cgroup: Eliminate the need for cgroup_mutex in proc_cgroup_show()
by Chen Ridong 22 May '25

22 May '25

From: Yafang Shao <laoar.shao(a)gmail.com> mainline inclusion from mainline-v6.8-rc1 commit 9067d90006df089b9a1da0d74f0cad232a5d726a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IC90RC Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… ---------------------------------------------------------------------- The cgroup root_list is already RCU-safe. Therefore, we can replace the cgroup_mutex with the RCU read lock in some particular paths. This change will be particularly beneficial for frequent operations, such as `cat /proc/self/cgroup`, in a cgroup1-based container environment. I did stress tests with this change, as outlined below (with CONFIG_PROVE_RCU_LIST enabled): - Continuously mounting and unmounting named cgroups in some tasks, for example: cgrp_name=$1 while true do mount -t cgroup -o none,name=$cgrp_name none /$cgrp_name umount /$cgrp_name done - Continuously triggering proc_cgroup_show() in some tasks concurrently, for example: while true; do cat /proc/self/cgroup > /dev/null; done They can ran successfully after implementing this change, with no RCU warnings in dmesg. Signed-off-by: Yafang Shao <laoar.shao(a)gmail.com> Signed-off-by: Tejun Heo <tj(a)kernel.org> Signed-off-by: Chen Ridong <chenridong(a)huawei.com> --- kernel/cgroup/cgroup.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index b4b760fd7790d..34f1a810f7b08 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -6390,7 +6390,7 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, if (!buf) goto out; - cgroup_lock(); + rcu_read_lock(); spin_lock_irq(&css_set_lock); for_each_root(root) { @@ -6401,6 +6401,11 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, if (root == &cgrp_dfl_root && !READ_ONCE(cgrp_dfl_visible)) continue; + cgrp = task_cgroup_from_root(tsk, root); + /* The root has already been unmounted. */ + if (!cgrp) + continue; + seq_printf(m, "%d:", root->hierarchy_id); if (root != &cgrp_dfl_root) for_each_subsys(ss, ssid) @@ -6411,9 +6416,6 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, seq_printf(m, "%sname=%s", count ? "," : "", root->name); seq_putc(m, ':'); - - cgrp = task_cgroup_from_root(tsk, root); - /* * On traditional hierarchies, all zombie tasks show up as * belonging to the root cgroup. On the default hierarchy, @@ -6445,7 +6447,7 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, retval = 0; out_unlock: spin_unlock_irq(&css_set_lock); - cgroup_unlock(); + rcu_read_unlock(); kfree(buf); out: return retval; -- 2.34.1

2 1

[PATCH OLK-6.6 v4 00/11] IPIV-BUGFIX for HIP12
by Jinqian Yang 22 May '25

22 May '25

Compared with the previous IPIV, the IPIV-BUGFIX has the following changes: 1. Use Kconfig to Control whether to enable IPIV. 2. Users use ioctl to control whether to enable IPIV. 3. Use the SMCCC interface for Guest OS to control whether to enable IPIV. 4. ensure that enable_ipiv_from_guest are the same before and after live migration 5. make sure vcpu_id == vcpu_idx. 6. the MPIDR cannot be changed When IPIV is enabled. 7. fix bug that ipiv enable is displayed on the host when "kvm-arm.vgic_v4_enable=0 kvm-arm.ipiv_enabled=1" is configured. 8. Add Exception Printing Jinqian Yang (5): arm64/config: add config to control whether enable IPIV feature KVM: arm64: fix live migration bug of IPIv KVM: arm64: using kvm_vgic_global_state for ipiv kvm: hisi: print error for IPIV arm64/kabi: use KABI_EXTEND to skip KABI check Zhou Wang (6): KVM: arm64: Introduce ipiv enable ioctl KVM: arm64: Document PV-sgi interface KVM: arm64: Implement PV_SGI related calls irqchip/gic: Add HiSilicon PV SGI support kvm: hisi: make sure vcpu_id and vcpu_idx have same value in IPIv kvm: hisi: Don't allow to change mpidr in IPIv Documentation/virt/kvm/arm/hypercalls.rst | 4 ++ Documentation/virt/kvm/arm/pvsgi.rst | 33 ++++++++++++++ arch/arm64/Kconfig | 13 ++++++ arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/include/asm/kvm_host.h | 3 ++ arch/arm64/include/uapi/asm/kvm.h | 5 +++ arch/arm64/kvm/arm.c | 37 +++++++++++---- arch/arm64/kvm/hisilicon/hisi_virt.c | 32 ++++++++++++- arch/arm64/kvm/hisilicon/hisi_virt.h | 20 +++++++-- arch/arm64/kvm/hypercalls.c | 26 +++++++++++ arch/arm64/kvm/sys_regs.c | 34 +++++++++----- arch/arm64/kvm/vgic/vgic-init.c | 42 ++++++++++++++--- arch/arm64/kvm/vgic/vgic-its.c | 26 +++++++++++ arch/arm64/kvm/vgic/vgic-mmio-v3.c | 1 - drivers/irqchip/irq-gic-v3-its.c | 50 ++++++++++++++------- drivers/irqchip/irq-gic-v3.c | 55 ++++++++++++++++++----- include/linux/arm-smccc.h | 15 +++++++ include/linux/irqchip/arm-gic-v3.h | 10 +++++ include/linux/irqchip/arm-gic-v4.h | 5 ++- include/uapi/linux/kvm.h | 2 +- 20 files changed, 356 insertions(+), 58 deletions(-) create mode 100644 Documentation/virt/kvm/arm/pvsgi.rst -- 2.33.0

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[PATCH OLK-5.10 v5 00/28] Fix x2apic enablement and allow more CPUs, clean up I/OAPIC and MSI bitfields
by Liu Chao 22 May '25

22 May '25

mainline inclusion from mainline-v5.11-rc1 commit 2e730cb56b2cd1626fecaf23ef1537fb24721ef2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IC9GHN Reference: https://lore.kernel.org/all/20201024213535.443185-1-dwmw2@infradead.org/ -------------------------------- Fix the conditions for enabling x2apic on guests without interrupt remapping, and support 15-bit Extended Destination ID to allow 32768 CPUs without IR on hypervisors that support it. Make the I/OAPIC code generate its RTE directly from the MSI message created by the parent irqchip, and fix up a bunch of magic mask/shift macros to use bitfields for MSI messages and I/OAPIC RTEs while we're at it. v5: add new commit d981059e13ff ("x86/hyperv: Enable 15-bit APIC ID if the hypervisor supports it") v4: add new bugfix commit 4b8ef157ca83. v3: add new bugfix commits. v2: adapt ioapic_sync_hardware_data. David Woodhouse (17): x86/hpet: Move MSI support into hpet.c x86/ioapic: Generate RTE directly from parent irqchip's MSI message genirq/irqdomain: Implement get_name() method on irqchip fwnodes x86/apic: Add select() method on vector irqdomain iommu/amd: Implement select() method on remapping irqdomain iommu/vt-d: Implement select() method on remapping irqdomain iommu/hyper-v: Implement select() method on remapping irqdomain x86/hpet: Use irq_find_matching_fwspec() to find remapping irqdomain x86/ioapic: Use irq_find_matching_fwspec() to find remapping irqdomain x86: Kill all traces of irq_remapping_get_irq_domain() iommu/vt-d: Simplify intel_irq_remapping_select() x86/ioapic: Handle Extended Destination ID field in RTE x86/apic: Support 15 bits of APIC ID in MSI where available iommu/hyper-v: Disable IRQ pseudo-remapping if 15 bit APIC IDs are available x86/kvm: Enable 15-bit extension when KVM_FEATURE_MSI_EXT_DEST_ID detected x86/ioapic: Use I/O-APIC ID for finding irqdomain, not index iommu/amd: Stop irq_remapping_select() matching when remapping is disabled Dexuan Cui (2): iommu/hyper-v: Remove I/O-APIC ID check from hyperv_irq_remapping_select() x86/hyperv: Enable 15-bit APIC ID if the hypervisor supports it Joerg Roedel (1): iommu/amd: Keep track of amd_iommu_irq_remap state Thomas Gleixner (8): x86/devicetree: Fix the ioapic interrupt type table PCI: vmd: Use msi_msg shadow structs x86/kvm: Use msi_msg shadow structs x86/pci/xen: Use msi_msg shadow structs x86/msi: Remove msidef.h x86/io_apic: Cleanup trigger/polarity helpers x86/ioapic: Cleanup IO/APIC route entry structs x86/ioapic: Correct the PCI/ISA trigger type selection arch/x86/include/asm/hpet.h | 11 - arch/x86/include/asm/hw_irq.h | 13 +- arch/x86/include/asm/hyperv-tlfs.h | 7 + arch/x86/include/asm/io_apic.h | 79 ++--- arch/x86/include/asm/irq_remapping.h | 9 - arch/x86/include/asm/irqdomain.h | 3 + arch/x86/include/asm/msi.h | 3 +- arch/x86/include/asm/msidef.h | 57 --- arch/x86/include/asm/x86_init.h | 2 + arch/x86/kernel/apic/apic.c | 26 +- arch/x86/kernel/apic/io_apic.c | 508 ++++++++++++++------------- arch/x86/kernel/apic/msi.c | 111 ------ arch/x86/kernel/apic/vector.c | 43 +++ arch/x86/kernel/cpu/mshyperv.c | 29 ++ arch/x86/kernel/devicetree.c | 30 +- arch/x86/kernel/hpet.c | 122 ++++++- arch/x86/kernel/kvm.c | 6 + arch/x86/kernel/x86_init.c | 1 + arch/x86/kvm/irq_comm.c | 31 +- arch/x86/pci/intel_mid_pci.c | 8 +- arch/x86/pci/xen.c | 26 +- drivers/iommu/amd/init.c | 5 +- drivers/iommu/amd/iommu.c | 70 ++-- drivers/iommu/hyperv-iommu.c | 44 +-- drivers/iommu/intel/irq_remapping.c | 76 ++-- drivers/iommu/irq_remapping.c | 14 - drivers/iommu/irq_remapping.h | 3 - drivers/pci/controller/vmd.c | 9 +- kernel/irq/irqdomain.c | 11 +- 29 files changed, 646 insertions(+), 711 deletions(-) delete mode 100644 arch/x86/include/asm/msidef.h -- 2.33.0

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[PATCH OLK-5.10] mm: slub: add __GFP_NOWARN when allocations with GFP_NOWAIT
by Kaixiong Yu 22 May '25

22 May '25

hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IC9E4O -------------------------------- GFP_NOWAIT callers are always prepared for their allocations to fail because they fail so frequently. In such case, don't need to generate a warning. So, add __GFP_NOWARN to flag when allocations. Fixes:76e3125423ba ("mm/slub: Reduce memory consumption in extreme scenarios") Signed-off-by: Kaixiong Yu <yukaixiong(a)huawei.com> --- mm/slub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index d4e7e88df7ff..bcc00a95c368 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2782,7 +2782,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, */ if (unlikely(node != NUMA_NO_NODE && !(gfpflags & __GFP_THISNODE) && try_thisnode)) - pc_gfpflags = GFP_NOWAIT | __GFP_THISNODE; + pc_gfpflags = GFP_NOWAIT | __GFP_THISNODE | __GFP_NOWARN; freelist = new_slab_objects(s, pc_gfpflags, node, &c); -- 2.34.1

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