diff options
| author | Avi Kivity <avi@qumranet.com> | 2008-03-18 11:05:52 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 12:00:33 +0300 |
| commit | 947da53830690cbd77d7f2b625d0df1f161ffd54 (patch) | |
| tree | 32db5b7e97b5df34ada31ac9de8f3250b90dfd55 /arch/x86/kvm/mmu.c | |
| parent | 97646202bc3f190dfcb48a3d506ea2445717d392 (diff) | |
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>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 072e9422c914..a5872b3c466d 100644 --- 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; } |