> -----Original Message-----
> From: Hao, Xudong
> Sent: Wednesday, May 23, 2012 9:31 PM
> To: avi@xxxxxxxxxx
> Cc: kvm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; mtosatti@xxxxxxxxxx;
> takuya.yoshikawa@xxxxxxxxx; Zhang, Xiantao; Shan, Haitao
> Subject: RE: [PATCH v3 4/4] Enabling Access bit when doing memory swapping
>
> Hi, Avi
>
> Will these patches be accepted if no other comments?
>
> Thanks,
> -Xudong
>
>
> > -----Original Message-----
> > From: Hao, Xudong
> > Sent: Tuesday, May 22, 2012 11:23 AM
> > To: avi@xxxxxxxxxx
> > Cc: kvm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> mtosatti@xxxxxxxxxx;
> > takuya.yoshikawa@xxxxxxxxx; Zhang, Xiantao; Hao, Xudong; Shan, Haitao
> > Subject: [PATCH v3 4/4] Enabling Access bit when doing memory swapping
> >
> > <Re-send>
> >
> > Enabling Access bit when doing memory swapping.
> >
> > Changes from v2:
> > -Still using claer_bit() function to make sure it's atomic operation.
> >
> > Signed-off-by: Haitao Shan <haitao.shan@xxxxxxxxx>
> > Signed-off-by: Xudong Hao <xudong.hao@xxxxxxxxx>
> > ---
> > arch/x86/kvm/mmu.c | 14 ++++++++------
> > arch/x86/kvm/vmx.c | 6 ++++--
> > 2 files changed, 12 insertions(+), 8 deletions(-)
> >
> > diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> > index 72102e0..c2fef8e 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;
> > }
> > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> > index 32eb588..ea6390e 100644
> > --- a/arch/x86/kvm/vmx.c
> > +++ b/arch/x86/kvm/vmx.c
> > @@ -7275,8 +7275,10 @@ static int __init vmx_init(void)
> > vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
> >
> > if (enable_ept) {
> > - kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
> > - VMX_EPT_EXECUTABLE_MASK);
> > + kvm_mmu_set_mask_ptes(0ull,
> > + (enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
> > + (enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
> > + 0ull, VMX_EPT_EXECUTABLE_MASK);
> > ept_set_mmio_spte_mask();
> > kvm_enable_tdp();
> > } else
> > --
> > 1.5.6
Hi, Avi
Do you have other comments for this series of patches?
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