diff options
| author | Xudong Hao <xudong.hao@intel.com> | 2012-05-22 03:23:15 (GMT) |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-06-05 13:31:05 (GMT) |
| commit | 3f6d8c8a478dd1ab2a4944b0d65474df06ecd882 (patch) | |
| tree | 87eb511e0ec229ee179fc054b1eba10768cfcab2 /arch/x86/kvm/mmu.c | |
| parent | b38f99347871d7fc49e6367395dce0d757f6ab8d (diff) | |
| download | linux-3f6d8c8a478dd1ab2a4944b0d65474df06ecd882.tar.xz | |
KVM: VMX: Use EPT Access bit in response to memory notifiers
Signed-off-by: Haitao Shan <haitao.shan@intel.com>
Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index be3cea4..d07e436 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1242,7 +1242,8 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, int young = 0; /* - * Emulate the accessed bit for EPT, by checking if this page has + * In case of absence of EPT Access and Dirty Bits supports, + * emulate the accessed bit for EPT, by checking if this page has * an EPT mapping, and clearing it if it does. On the next access, * a new EPT mapping will be established. * This has some overhead, but not as much as the cost of swapping @@ -1253,11 +1254,12 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, for (sptep = rmap_get_first(*rmapp, &iter); sptep; sptep = rmap_get_next(&iter)) { - BUG_ON(!(*sptep & PT_PRESENT_MASK)); + BUG_ON(!is_shadow_present_pte(*sptep)); - if (*sptep & PT_ACCESSED_MASK) { + if (*sptep & shadow_accessed_mask) { young = 1; - clear_bit(PT_ACCESSED_SHIFT, (unsigned long *)sptep); + clear_bit((ffs(shadow_accessed_mask) - 1), + (unsigned long *)sptep); } } @@ -1281,9 +1283,9 @@ static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, for (sptep = rmap_get_first(*rmapp, &iter); sptep; sptep = rmap_get_next(&iter)) { - BUG_ON(!(*sptep & PT_PRESENT_MASK)); + BUG_ON(!is_shadow_present_pte(*sptep)); - if (*sptep & PT_ACCESSED_MASK) { + if (*sptep & shadow_accessed_mask) { young = 1; break; } |