From: Zhenyu Ye yezhenyu2@huawei.com
mainline inclusion from mainline-v5.9-rc1 commit c4ab2cbc1d87 category: feature bugzilla: NA CVE: NA
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This patch uses the cleared_* in struct mmu_gather to set the TTL field in flush_tlb_range().
Signed-off-by: Zhenyu Ye yezhenyu2@huawei.com Reviewed-by: Catalin Marinas catalin.marinas@arm.com Link: https://lore.kernel.org/r/20200625080314.230-6-yezhenyu2@huawei.com Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Chen Zhou chenzhou10@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/arm64/include/asm/tlb.h | 29 ++++++++++++++++++++++++++++- arch/arm64/include/asm/tlbflush.h | 14 ++++++++------ 2 files changed, 36 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h index 106fdc951b6e..eb49cf9c36f4 100644 --- a/arch/arm64/include/asm/tlb.h +++ b/arch/arm64/include/asm/tlb.h @@ -31,11 +31,37 @@ static void tlb_flush(struct mmu_gather *tlb);
#include <asm-generic/tlb.h>
+/* + * get the tlbi levels in arm64. Default value is 0 if more than one + * of cleared_* is set or neither is set. + * Arm64 doesn't support p4ds now. + */ +static inline int tlb_get_level(struct mmu_gather *tlb) +{ + if (tlb->cleared_ptes && !(tlb->cleared_pmds || + tlb->cleared_puds || + tlb->cleared_p4ds)) + return 3; + + if (tlb->cleared_pmds && !(tlb->cleared_ptes || + tlb->cleared_puds || + tlb->cleared_p4ds)) + return 2; + + if (tlb->cleared_puds && !(tlb->cleared_ptes || + tlb->cleared_pmds || + tlb->cleared_p4ds)) + return 1; + + return 0; +} + static inline void tlb_flush(struct mmu_gather *tlb) { struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0); bool last_level = !tlb->freed_tables; unsigned long stride = tlb_get_unmap_size(tlb); + int tlb_level = tlb_get_level(tlb);
/* * If we're tearing down the address space then we only care about @@ -48,7 +74,8 @@ static inline void tlb_flush(struct mmu_gather *tlb) return; }
- __flush_tlb_range(&vma, tlb->start, tlb->end, stride, last_level); + __flush_tlb_range(&vma, tlb->start, tlb->end, stride, + last_level, tlb_level); }
static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h index 25d8d33bba5e..6e07e5d753b6 100644 --- a/arch/arm64/include/asm/tlbflush.h +++ b/arch/arm64/include/asm/tlbflush.h @@ -241,7 +241,8 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
static inline void __flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end, - unsigned long stride, bool last_level) + unsigned long stride, bool last_level, + int tlb_level) { unsigned long asid = ASID(vma->vm_mm); unsigned long addr; @@ -263,11 +264,11 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma, dsb(ishst); for (addr = start; addr < end; addr += stride) { if (last_level) { - __tlbi_level(vale1is, addr, 0); - __tlbi_user_level(vale1is, addr, 0); + __tlbi_level(vale1is, addr, tlb_level); + __tlbi_user_level(vale1is, addr, tlb_level); } else { - __tlbi_level(vae1is, addr, 0); - __tlbi_user_level(vae1is, addr, 0); + __tlbi_level(vae1is, addr, tlb_level); + __tlbi_user_level(vae1is, addr, tlb_level); } } dsb(ish); @@ -279,8 +280,9 @@ static inline void flush_tlb_range(struct vm_area_struct *vma, /* * We cannot use leaf-only invalidation here, since we may be invalidating * table entries as part of collapsing hugepages or moving page tables. + * Set the tlb_level to 0 because we can not get enough information here. */ - __flush_tlb_range(vma, start, end, PAGE_SIZE, false); + __flush_tlb_range(vma, start, end, PAGE_SIZE, false, 0); }
static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)