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KVM: MMU: do not record gfn in kvm_mmu_pte_write

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No need to record the gfn to verifier the pte has the same mode as
current vcpu, it's because we only speculatively update the pte only
if the pte and vcpu have the same mode

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2011-03-04 19:00:00 +08:00 committed by Marcelo Tosatti
parent 48c0e4e906
commit 49b26e26e4
3 changed files with 2 additions and 7 deletions
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1
arch/x86/include/asm/kvm_host.h
View file

@ -336,7 +336,6 @@ struct kvm_vcpu_arch {
gfn_t last_pte_gfn;
struct {
gfn_t gfn; /* presumed gfn during guest pte update */
pfn_t pfn; /* pfn corresponding to that gfn */
unsigned long mmu_seq;
} update_pte;

6
arch/x86/kvm/mmu.c
View file

@ -3228,7 +3228,6 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
kvm_release_pfn_clean(pfn);
return;
}
vcpu->arch.update_pte.gfn = gfn;
vcpu->arch.update_pte.pfn = pfn;
}
@ -3275,9 +3274,8 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
/*
* Assume that the pte write on a page table of the same type
* as the current vcpu paging mode. This is nearly always true
* (might be false while changing modes). Note it is verified later
* by update_pte().
* as the current vcpu paging mode since we update the sptes only
* when they have the same mode.
*/
if ((is_pae(vcpu) && bytes == 4) || !new) {
/* Handle a 32-bit guest writing two halves of a 64-bit gpte */

2
arch/x86/kvm/paging_tmpl.h
View file

@ -339,8 +339,6 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
if (gpte_to_gfn(gpte) != vcpu->arch.update_pte.gfn)
return;
pfn = vcpu->arch.update_pte.pfn;
if (is_error_pfn(pfn))
return;