From 49b26e26e4b7b94753b39f7edb0c34f3d1c4c167 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Fri, 4 Mar 2011 19:00:00 +0800 Subject: [PATCH] KVM: MMU: do not record gfn in kvm_mmu_pte_write 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 Signed-off-by: Avi Kivity --- arch/x86/include/asm/kvm_host.h | 1 - arch/x86/kvm/mmu.c | 6 ++---- arch/x86/kvm/paging_tmpl.h | 2 -- 3 files changed, 2 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 37bd730ff852..f08314f303e0 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -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; diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index d5455b1b725f..91a194667432 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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 */ diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 6bccc24c4181..b3862eeabb8a 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -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; -- 2.39.5