From: David Hildenbrand david@redhat.com
mainline inclusion from mainline-v6.9-rc1 commit 4d5bf0b6183f79ea361dd506365d2a471270735c category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9CHB4 CVE: NA
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Let's add a helper that lets us batch-process multiple consecutive PTEs.
Note that the loop will get optimized out on all architectures except on powerpc. We have to add an early define of __tlb_remove_tlb_entry() on ppc to make the compiler happy (and avoid making tlb_remove_tlb_entries() a macro).
[arnd@kernel.org: change __tlb_remove_tlb_entry() to an inline function] Link: https://lkml.kernel.org/r/20240221154549.2026073-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20240214204435.167852-8-david@redhat.com Signed-off-by: David Hildenbrand david@redhat.com Signed-off-by: Arnd Bergmann arnd@arndb.de Reviewed-by: Ryan Roberts ryan.roberts@arm.com Cc: Alexander Gordeev agordeev@linux.ibm.com Cc: Aneesh Kumar K.V aneesh.kumar@linux.ibm.com Cc: Arnd Bergmann arnd@arndb.de Cc: Catalin Marinas catalin.marinas@arm.com Cc: Christian Borntraeger borntraeger@linux.ibm.com Cc: Christophe Leroy christophe.leroy@csgroup.eu Cc: Heiko Carstens hca@linux.ibm.com Cc: Matthew Wilcox (Oracle) willy@infradead.org Cc: Michael Ellerman mpe@ellerman.id.au Cc: Michal Hocko mhocko@suse.com Cc: "Naveen N. Rao" naveen.n.rao@linux.ibm.com Cc: Nicholas Piggin npiggin@gmail.com Cc: Peter Zijlstra (Intel) peterz@infradead.org Cc: Sven Schnelle svens@linux.ibm.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Will Deacon will@kernel.org Cc: Yin Fengwei fengwei.yin@intel.com Signed-off-by: Andrew Morton akpm@linux-foundation.org (cherry picked from commit 4d5bf0b6183f79ea361dd506365d2a471270735c) Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com --- arch/powerpc/include/asm/tlb.h | 2 ++ include/asm-generic/tlb.h | 24 +++++++++++++++++++++++- 2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h index b3de6102a907..1ca7d4c4b90d 100644 --- a/arch/powerpc/include/asm/tlb.h +++ b/arch/powerpc/include/asm/tlb.h @@ -19,6 +19,8 @@
#include <linux/pagemap.h>
+static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, + unsigned long address); #define __tlb_remove_tlb_entry __tlb_remove_tlb_entry
#define tlb_flush tlb_flush diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index c092b54d06b9..50ddc0ed7ff0 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -595,7 +595,9 @@ static inline void tlb_flush_p4d_range(struct mmu_gather *tlb, }
#ifndef __tlb_remove_tlb_entry -#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0) +static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) +{ +} #endif
/** @@ -611,6 +613,26 @@ static inline void tlb_flush_p4d_range(struct mmu_gather *tlb, __tlb_remove_tlb_entry(tlb, ptep, address); \ } while (0)
+/** + * tlb_remove_tlb_entries - remember unmapping of multiple consecutive ptes for + * later tlb invalidation. + * + * Similar to tlb_remove_tlb_entry(), but remember unmapping of multiple + * consecutive ptes instead of only a single one. + */ +static inline void tlb_remove_tlb_entries(struct mmu_gather *tlb, + pte_t *ptep, unsigned int nr, unsigned long address) +{ + tlb_flush_pte_range(tlb, address, PAGE_SIZE * nr); + for (;;) { + __tlb_remove_tlb_entry(tlb, ptep, address); + if (--nr == 0) + break; + ptep++; + address += PAGE_SIZE; + } +} + #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ do { \ unsigned long _sz = huge_page_size(h); \