From 445074ed9a0d15891370975670bf4636d358b7c0 Mon Sep 17 00:00:00 2001 From: Punit Agrawal Date: Tue, 11 Dec 2018 17:10:40 +0000 Subject: [PATCH] KVM: arm64: Update age handlers to support PUD hugepages commit 35a63966194dd994f44150f07398c62f8dca011e upstream. In preparation for creating larger hugepages at Stage 2, add support to the age handling notifiers for PUD hugepages when encountered. Provide trivial helpers for arm32 to allow sharing code. Signed-off-by: Punit Agrawal Reviewed-by: Christoffer Dall Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon [ Replaced BUG() => WARN_ON(1) for arm32 PUD helpers ] Signed-off-by: Suzuki K Poulose Signed-off-by: Marc Zyngier Signed-off-by: Shannon Zhao Acked-by: Zou Cao --- arch/arm/include/asm/kvm_mmu.h | 6 +++++ arch/arm64/include/asm/kvm_mmu.h | 5 ++++ arch/arm64/include/asm/pgtable.h | 1 + virt/kvm/arm/mmu.c | 39 ++++++++++++++++---------------- 4 files changed, 32 insertions(+), 19 deletions(-) diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h index 79c6c423c11b..3aca12d1613d 100644 --- a/arch/arm/include/asm/kvm_mmu.h +++ b/arch/arm/include/asm/kvm_mmu.h @@ -114,6 +114,12 @@ static inline pud_t kvm_s2pud_mkyoung(pud_t pud) return pud; } +static inline bool kvm_s2pud_young(pud_t pud) +{ + WARN_ON(1); + return false; +} + static inline pte_t kvm_s2pte_mkwrite(pte_t pte) { pte_val(pte) |= L_PTE_S2_RDWR; diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index b55f87fd34f7..af0afc5c73c8 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -271,6 +271,11 @@ static inline pud_t kvm_s2pud_mkyoung(pud_t pud) return pud_mkyoung(pud); } +static inline bool kvm_s2pud_young(pud_t pud) +{ + return pud_young(pud); +} + #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep) #ifdef __PAGETABLE_PMD_FOLDED diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 6b45c9329e17..b6ae74a2a96a 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -370,6 +370,7 @@ static inline int pmd_protnone(pmd_t pmd) #define pfn_pmd(pfn,prot) __pmd(__phys_to_pmd_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) +#define pud_young(pud) pte_young(pud_pte(pud)) #define pud_mkyoung(pud) pte_pud(pte_mkyoung(pud_pte(pud))) #define pud_write(pud) pte_write(pud_pte(pud)) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 3be14274311b..8458d8136cd4 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1226,6 +1226,11 @@ static int stage2_pmdp_test_and_clear_young(pmd_t *pmd) return stage2_ptep_test_and_clear_young((pte_t *)pmd); } +static int stage2_pudp_test_and_clear_young(pud_t *pud) +{ + return stage2_ptep_test_and_clear_young((pte_t *)pud); +} + /** * kvm_phys_addr_ioremap - map a device range to guest IPA * @@ -1935,42 +1940,38 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) static int kvm_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data) { + pud_t *pud; pmd_t *pmd; pte_t *pte; - WARN_ON(size != PAGE_SIZE && size != PMD_SIZE); - pmd = stage2_get_pmd(kvm, NULL, gpa); - if (!pmd || pmd_none(*pmd)) /* Nothing there */ + WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE); + if (!stage2_get_leaf_entry(kvm, gpa, &pud, &pmd, &pte)) return 0; - if (pmd_thp_or_huge(*pmd)) /* THP, HugeTLB */ + if (pud) + return stage2_pudp_test_and_clear_young(pud); + else if (pmd) return stage2_pmdp_test_and_clear_young(pmd); - - pte = pte_offset_kernel(pmd, gpa); - if (pte_none(*pte)) - return 0; - - return stage2_ptep_test_and_clear_young(pte); + else + return stage2_ptep_test_and_clear_young(pte); } static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data) { + pud_t *pud; pmd_t *pmd; pte_t *pte; - WARN_ON(size != PAGE_SIZE && size != PMD_SIZE); - pmd = stage2_get_pmd(kvm, NULL, gpa); - if (!pmd || pmd_none(*pmd)) /* Nothing there */ + WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE); + if (!stage2_get_leaf_entry(kvm, gpa, &pud, &pmd, &pte)) return 0; - if (pmd_thp_or_huge(*pmd)) /* THP, HugeTLB */ + if (pud) + return kvm_s2pud_young(*pud); + else if (pmd) return pmd_young(*pmd); - - pte = pte_offset_kernel(pmd, gpa); - if (!pte_none(*pte)) /* Just a page... */ + else return pte_young(*pte); - - return 0; } int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end) -- GitLab