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mm: add PTE pointer parameter to flush_tlb_fix_spurious_fault()

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s390 can do more fine-grained handling of spurious TLB protection faults,
when there also is the PTE pointer available.

Therefore, pass on the PTE pointer to flush_tlb_fix_spurious_fault() as an
additional parameter.

This will add no functional change to other architectures, but those with
private flush_tlb_fix_spurious_fault() implementations need to be made
aware of the new parameter.

Link: https://lkml.kernel.org/r/20230306161548.661740-1-gerald.schaefer@linux.ibm.com
Signed-off-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>	[arm64]
Acked-by: Michael Ellerman <mpe@ellerman.id.au>		[powerpc]
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Gerald Schaefer 2023-03-06 17:15:48 +01:00 committed by Andrew Morton
parent e1807d5d27
commit 99c2913363
8 changed files with 17 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/include/asm/pgtable.h
View File

@ -57,7 +57,7 @@ static inline bool arch_thp_swp_supported(void)
* fault on one CPU which has been handled concurrently by another CPU
* does not need to perform additional invalidation.
*/
#define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
#define flush_tlb_fix_spurious_fault(vma, address, ptep) do { } while (0)
/*
* ZERO_PAGE is a global shared page that is always zero: used

3
arch/mips/include/asm/pgtable.h
View File

@ -469,7 +469,8 @@ static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
}
static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
unsigned long address)
unsigned long address,
pte_t *ptep)
{
}

3
arch/powerpc/include/asm/book3s/64/tlbflush.h
View File

@ -121,7 +121,8 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
#define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault
static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
unsigned long address)
unsigned long address,
pte_t *ptep)
{
/*
* Book3S 64 does not require spurious fault flushes because the PTE

12
arch/s390/include/asm/pgtable.h
View File

@ -1239,7 +1239,8 @@ static inline int pte_allow_rdp(pte_t old, pte_t new)
}
static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
unsigned long address)
unsigned long address,
pte_t *ptep)
{
/*
* RDP might not have propagated the PTE protection reset to all CPUs,
@ -1247,11 +1248,12 @@ static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
* NOTE: This will also be called when a racing pagetable update on
* another thread already installed the correct PTE. Both cases cannot
* really be distinguished.
* Therefore, only do the local TLB flush when RDP can be used, to avoid
* unnecessary overhead.
* Therefore, only do the local TLB flush when RDP can be used, and the
* PTE does not have _PAGE_PROTECT set, to avoid unnecessary overhead.
* A local RDP can be used to do the flush.
*/
if (MACHINE_HAS_RDP)
asm volatile("ptlb" : : : "memory");
if (MACHINE_HAS_RDP && !(pte_val(*ptep) & _PAGE_PROTECT))
__ptep_rdp(address, ptep, 0, 0, 1);
}
#define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault

2
arch/x86/include/asm/pgtable.h
View File

@ -1097,7 +1097,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm,
clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
}
#define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
#define flush_tlb_fix_spurious_fault(vma, address, ptep) do { } while (0)
#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))

2
include/linux/pgtable.h
View File

@ -817,7 +817,7 @@ static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio)
#endif
#ifndef flush_tlb_fix_spurious_fault
#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
#define flush_tlb_fix_spurious_fault(vma, address, ptep) flush_tlb_page(vma, address)
#endif
/*

3
mm/memory.c
View File

@ -4944,7 +4944,8 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
* with threads.
*/
if (vmf->flags & FAULT_FLAG_WRITE)
flush_tlb_fix_spurious_fault(vmf->vma, vmf->address);
flush_tlb_fix_spurious_fault(vmf->vma, vmf->address,
vmf->pte);
}
unlock:
pte_unmap_unlock(vmf->pte, vmf->ptl);

2
mm/pgtable-generic.c
View File

@ -69,7 +69,7 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
int changed = !pte_same(*ptep, entry);
if (changed) {
set_pte_at(vma->vm_mm, address, ptep, entry);
flush_tlb_fix_spurious_fault(vma, address);
flush_tlb_fix_spurious_fault(vma, address, ptep);
}
return changed;
}