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KVM: Cache pdptrs

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Instead of reloading the pdptrs on every entry and exit (vmcs writes on vmx,
guest memory access on svm) extract them on demand.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity
2009-05-31 22:58:47 +03:00
parent 8f5d549f02
commit 6de4f3ada4
7 changed files with 63 additions and 13 deletions
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24
arch/x86/kvm/svm.c
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@@ -777,6 +777,18 @@ static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
to_svm(vcpu)->vmcb->save.rflags = rflags;
}
static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
switch (reg) {
case VCPU_EXREG_PDPTR:
BUG_ON(!npt_enabled);
load_pdptrs(vcpu, vcpu->arch.cr3);
break;
default:
BUG();
}
}
static void svm_set_vintr(struct vcpu_svm *svm)
{
svm->vmcb->control.intercept |= 1ULL << INTERCEPT_VINTR;
@@ -2285,12 +2297,6 @@ static int handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
}
vcpu->arch.cr0 = svm->vmcb->save.cr0;
vcpu->arch.cr3 = svm->vmcb->save.cr3;
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
kvm_inject_gp(vcpu, 0);
return 1;
}
}
if (mmu_reload) {
kvm_mmu_reset_context(vcpu);
kvm_mmu_load(vcpu);
@@ -2641,6 +2647,11 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
svm->next_rip = 0;
if (npt_enabled) {
vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
}
svm_complete_interrupts(svm);
}
@@ -2749,6 +2760,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.set_gdt = svm_set_gdt,
.get_dr = svm_get_dr,
.set_dr = svm_set_dr,
.cache_reg = svm_cache_reg,
.get_rflags = svm_get_rflags,
.set_rflags = svm_set_rflags,