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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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21
arch/x86/kvm/paging_tmpl.h
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@@ -208,11 +208,8 @@ retry_walk:
goto error;
}
if (unlikely(write_fault && !is_writable_pte(pte)
&& (user_fault || is_write_protection(vcpu))))
eperm = true;
if (unlikely(user_fault && !(pte & PT_USER_MASK)))
if (!check_write_user_access(vcpu, write_fault, user_fault,
pte))
eperm = true;
#if PTTYPE == 64
@@ -625,8 +622,16 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
return 0;
/* mmio */
if (is_error_pfn(pfn))
return kvm_handle_bad_page(vcpu->kvm, walker.gfn, pfn);
if (is_error_pfn(pfn)) {
unsigned access = walker.pte_access;
bool dirty = is_dirty_gpte(walker.ptes[walker.level - 1]);
if (!dirty)
access &= ~ACC_WRITE_MASK;
return kvm_handle_bad_page(vcpu, mmu_is_nested(vcpu) ? 0 :
addr, access, walker.gfn, pfn);
}
spin_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu, mmu_seq))
@@ -666,6 +671,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
u64 *sptep;
int need_flush = 0;
vcpu_clear_mmio_info(vcpu, gva);
spin_lock(&vcpu->kvm->mmu_lock);
for_each_shadow_entry(vcpu, gva, iterator) {