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KVM: MMU: cache mmio info on page fault path

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If the page fault is caused by mmio, we can cache the mmio info, later, we do
not need to walk guest page table and quickly know it is a mmio fault while we
emulate the mmio instruction

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong
2011-07-12 03:23:20 +08:00
committed by Avi Kivity
parent af7cc7d1ee
commit bebb106a5a
6 changed files with 96 additions and 21 deletions
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11
arch/x86/kvm/x86.c
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@@ -4016,6 +4016,14 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
if (vcpu_match_mmio_gva(vcpu, gva) &&
check_write_user_access(vcpu, write, access,
vcpu->arch.access)) {
*gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
(gva & (PAGE_SIZE - 1));
return 1;
}
if (write)
access |= PFERR_WRITE_MASK;
@@ -4028,6 +4036,9 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
return 1;
if (vcpu_match_mmio_gpa(vcpu, *gpa))
return 1;
return 0;
}