From: Alistair Popple Date: Tue, 25 Jul 2023 13:42:05 +0000 (+1000) Subject: mmu_notifiers: call invalidate_range() when invalidating TLBs X-Git-Tag: v6.6.7~1970^2~321 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6bbd42e2df8f90b022fa0b82986d58ecb30b9dcc;p=platform%2Fkernel%2Flinux-starfive.git mmu_notifiers: call invalidate_range() when invalidating TLBs The invalidate_range() is going to become an architecture specific mmu notifier used to keep the TLB of secondary MMUs such as an IOMMU in sync with the CPU page tables. Currently it is called from separate code paths to the main CPU TLB invalidations. This can lead to a secondary TLB not getting invalidated when required and makes it hard to reason about when exactly the secondary TLB is invalidated. To fix this move the notifier call to the architecture specific TLB maintenance functions for architectures that have secondary MMUs requiring explicit software invalidations. This fixes a SMMU bug on ARM64. On ARM64 PTE permission upgrades require a TLB invalidation. This invalidation is done by the architecture specific ptep_set_access_flags() which calls flush_tlb_page() if required. However this doesn't call the notifier resulting in infinite faults being generated by devices using the SMMU if it has previously cached a read-only PTE in it's TLB. Moving the invalidations into the TLB invalidation functions ensures all invalidations happen at the same time as the CPU invalidation. The architecture specific flush_tlb_all() routines do not call the notifier as none of the IOMMUs require this. Link: https://lkml.kernel.org/r/0287ae32d91393a582897d6c4db6f7456b1001f2.1690292440.git-series.apopple@nvidia.com Signed-off-by: Alistair Popple Suggested-by: Jason Gunthorpe Tested-by: SeongJae Park Acked-by: Catalin Marinas Reviewed-by: Jason Gunthorpe Tested-by: Luis Chamberlain Cc: Andrew Donnellan Cc: Chaitanya Kumar Borah Cc: Frederic Barrat Cc: John Hubbard Cc: Kevin Tian Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Nicolin Chen Cc: Robin Murphy Cc: Sean Christopherson Cc: Tvrtko Ursulin Cc: Will Deacon Cc: Zhi Wang Signed-off-by: Andrew Morton --- diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h index 3456866..a99349d 100644 --- a/arch/arm64/include/asm/tlbflush.h +++ b/arch/arm64/include/asm/tlbflush.h @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -252,6 +253,7 @@ static inline void flush_tlb_mm(struct mm_struct *mm) __tlbi(aside1is, asid); __tlbi_user(aside1is, asid); dsb(ish); + mmu_notifier_invalidate_range(mm, 0, -1UL); } static inline void __flush_tlb_page_nosync(struct mm_struct *mm, @@ -263,6 +265,8 @@ static inline void __flush_tlb_page_nosync(struct mm_struct *mm, addr = __TLBI_VADDR(uaddr, ASID(mm)); __tlbi(vale1is, addr); __tlbi_user(vale1is, addr); + mmu_notifier_invalidate_range(mm, uaddr & PAGE_MASK, + (uaddr & PAGE_MASK) + PAGE_SIZE); } static inline void flush_tlb_page_nosync(struct vm_area_struct *vma, @@ -396,6 +400,7 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma, scale++; } dsb(ish); + mmu_notifier_invalidate_range(vma->vm_mm, start, end); } static inline void flush_tlb_range(struct vm_area_struct *vma, diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush.h b/arch/powerpc/include/asm/book3s/64/tlbflush.h index 0d0c144..dca0477 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h @@ -5,6 +5,7 @@ #define MMU_NO_CONTEXT ~0UL #include +#include #include #include diff --git a/arch/powerpc/mm/book3s64/radix_hugetlbpage.c b/arch/powerpc/mm/book3s64/radix_hugetlbpage.c index 5e31955..f3fb49f 100644 --- a/arch/powerpc/mm/book3s64/radix_hugetlbpage.c +++ b/arch/powerpc/mm/book3s64/radix_hugetlbpage.c @@ -39,6 +39,7 @@ void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long st radix__flush_tlb_pwc_range_psize(vma->vm_mm, start, end, psize); else radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize); + mmu_notifier_invalidate_range(vma->vm_mm, start, end); } void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma, diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c index 0bd4866..4d44902a 100644 --- a/arch/powerpc/mm/book3s64/radix_tlb.c +++ b/arch/powerpc/mm/book3s64/radix_tlb.c @@ -987,6 +987,7 @@ void radix__flush_tlb_mm(struct mm_struct *mm) } } preempt_enable(); + mmu_notifier_invalidate_range(mm, 0, -1UL); } EXPORT_SYMBOL(radix__flush_tlb_mm); @@ -1020,6 +1021,7 @@ static void __flush_all_mm(struct mm_struct *mm, bool fullmm) _tlbiel_pid_multicast(mm, pid, RIC_FLUSH_ALL); } preempt_enable(); + mmu_notifier_invalidate_range(mm, 0, -1UL); } void radix__flush_all_mm(struct mm_struct *mm) @@ -1228,6 +1230,7 @@ static inline void __radix__flush_tlb_range(struct mm_struct *mm, } out: preempt_enable(); + mmu_notifier_invalidate_range(mm, start, end); } void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start, @@ -1392,6 +1395,7 @@ static void __radix__flush_tlb_range_psize(struct mm_struct *mm, } out: preempt_enable(); + mmu_notifier_invalidate_range(mm, start, end); } void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start, diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 837e4a5..0a54323 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -3,6 +3,7 @@ #define _ASM_X86_TLBFLUSH_H #include +#include #include #include @@ -282,6 +283,7 @@ static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *b { inc_mm_tlb_gen(mm); cpumask_or(&batch->cpumask, &batch->cpumask, mm_cpumask(mm)); + mmu_notifier_invalidate_range(mm, 0, -1UL); } static inline void arch_flush_tlb_batched_pending(struct mm_struct *mm) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 267acf2..93b2f81 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -1036,6 +1037,7 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, put_flush_tlb_info(); put_cpu(); + mmu_notifier_invalidate_range(mm, start, end); } diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index b4661720..bc32a22 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -456,7 +456,6 @@ static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) return; tlb_flush(tlb); - mmu_notifier_invalidate_range(tlb->mm, tlb->start, tlb->end); __tlb_reset_range(tlb); }