KVM: MMU: Set the accessed bit on non-speculative shadow ptes

If we populate a shadow pte due to a fault (and not speculatively due to a
pte write) then we can set the accessed bit on it, as we know it will be
set immediately on the next guest instruction.  This saves a read-modify-write
operation.

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 072e942..a5872b3 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1020,7 +1020,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
                         unsigned pt_access, unsigned pte_access,
                         int user_fault, int write_fault, int dirty,
                         int *ptwrite, int largepage, gfn_t gfn,
-                        struct page *page)
+                        struct page *page, bool speculative)
 {
        u64 spte;
        int was_rmapped = 0;
@@ -1061,6 +1061,8 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
         * demand paging).
         */
        spte = PT_PRESENT_MASK | PT_DIRTY_MASK;
+       if (!speculative)
+               pte_access |= PT_ACCESSED_MASK;
        if (!dirty)
                pte_access &= ~ACC_WRITE_MASK;
        if (!(pte_access & ACC_EXEC_MASK))
@@ -1148,13 +1150,13 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
 
                if (level == 1) {
                        mmu_set_spte(vcpu, &table[index], ACC_ALL, ACC_ALL,
-                                    0, write, 1, &pt_write, 0, gfn, page);
+                                    0, write, 1, &pt_write, 0, gfn, page, false);
                        return pt_write;
                }
 
                if (largepage && level == 2) {
                        mmu_set_spte(vcpu, &table[index], ACC_ALL, ACC_ALL,
-                                   0, write, 1, &pt_write, 1, gfn, page);
+                                    0, write, 1, &pt_write, 1, gfn, page, false);
                        return pt_write;
                }
 

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 57abbd0..e9ae5db 100644 (file)
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -266,7 +266,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
        get_page(npage);
        mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0,
                     gpte & PT_DIRTY_MASK, NULL, largepage, gpte_to_gfn(gpte),
-                    npage);
+                    npage, true);
 }
 
 /*
@@ -349,7 +349,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
        mmu_set_spte(vcpu, shadow_ent, access, walker->pte_access & access,
                     user_fault, write_fault,
                     walker->ptes[walker->level-1] & PT_DIRTY_MASK,
-                    ptwrite, largepage, walker->gfn, page);
+                    ptwrite, largepage, walker->gfn, page, false);
 
        return shadow_ent;
 }