diff options
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/include/asm/kvm_host.h | 1 | ||||
-rw-r--r-- | arch/x86/kvm/mmu.c | 34 | ||||
-rw-r--r-- | arch/x86/mm/gup.c | 3 |
3 files changed, 38 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index aa75f21..ffd7f8d 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -822,6 +822,7 @@ extern bool kvm_rebooting; #define KVM_ARCH_WANT_MMU_NOTIFIER int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); int kvm_age_hva(struct kvm *kvm, unsigned long hva); +int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte); int cpuid_maxphyaddr(struct kvm_vcpu *vcpu); int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu); diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 47b2c32..f02b8ed 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -945,6 +945,35 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, return young; } +static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, + unsigned long data) +{ + u64 *spte; + int young = 0; + + /* + * If there's no access bit in the secondary pte set by the + * hardware it's up to gup-fast/gup to set the access bit in + * the primary pte or in the page structure. + */ + if (!shadow_accessed_mask) + goto out; + + spte = rmap_next(kvm, rmapp, NULL); + while (spte) { + u64 _spte = *spte; + BUG_ON(!(_spte & PT_PRESENT_MASK)); + young = _spte & PT_ACCESSED_MASK; + if (young) { + young = 1; + break; + } + spte = rmap_next(kvm, rmapp, spte); + } +out: + return young; +} + #define RMAP_RECYCLE_THRESHOLD 1000 static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) @@ -965,6 +994,11 @@ int kvm_age_hva(struct kvm *kvm, unsigned long hva) return kvm_handle_hva(kvm, hva, 0, kvm_age_rmapp); } +int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) +{ + return kvm_handle_hva(kvm, hva, 0, kvm_test_age_rmapp); +} + #ifdef MMU_DEBUG static int is_empty_shadow_page(u64 *spt) { diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c index 269aa53..dbe34b9 100644 --- a/arch/x86/mm/gup.c +++ b/arch/x86/mm/gup.c @@ -8,6 +8,7 @@ #include <linux/mm.h> #include <linux/vmstat.h> #include <linux/highmem.h> +#include <linux/swap.h> #include <asm/pgtable.h> @@ -89,6 +90,7 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, VM_BUG_ON(!pfn_valid(pte_pfn(pte))); page = pte_page(pte); get_page(page); + SetPageReferenced(page); pages[*nr] = page; (*nr)++; @@ -103,6 +105,7 @@ static inline void get_head_page_multiple(struct page *page, int nr) VM_BUG_ON(page != compound_head(page)); VM_BUG_ON(page_count(page) == 0); atomic_add(nr, &page->_count); + SetPageReferenced(page); } static inline void get_huge_page_tail(struct page *page) |