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xtensa: define update_mmu_tlb function 

Before the commit f9ce0be71d ("mm: Cleanup faultaround and finish_fault()
codepaths") there was a call to update_mmu_cache in alloc_set_pte that
used to invalidate TLB entry caching invalid PTE that caused a page
fault. That commit removed that call so now invalid TLB entry survives
causing repetitive page faults on the CPU that took the initial fault
until that TLB entry is occasionally evicted. This issue is spotted by
the xtensa TLB sanity checker.

Fix this issue by defining update_mmu_tlb function that flushes TLB entry
for the faulting address.

Cc: stable@vger.kernel.org # 5.12+
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2022-01-03 12:08:31 -08:00
parent a3d0245c58
commit 1c4664faa3
2 changed files with 10 additions and 0 deletions
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4
arch/xtensa/include/asm/pgtable.h
View File

@ -411,6 +411,10 @@ extern void update_mmu_cache(struct vm_area_struct * vma,
typedef pte_t *pte_addr_t; typedef pte_t *pte_addr_t;
void update_mmu_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep);
#define __HAVE_ARCH_UPDATE_MMU_TLB
#endif /* !defined (__ASSEMBLY__) */ #endif /* !defined (__ASSEMBLY__) */
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG

6
arch/xtensa/mm/tlb.c
View File

@ -162,6 +162,12 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
} }
} }
void update_mmu_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
local_flush_tlb_page(vma, address);
}
#ifdef CONFIG_DEBUG_TLB_SANITY #ifdef CONFIG_DEBUG_TLB_SANITY
static unsigned get_pte_for_vaddr(unsigned vaddr) static unsigned get_pte_for_vaddr(unsigned vaddr)