From 888f9f3e0cfa32baf05b3840f0248f5502292a0f Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Sun, 10 Jan 2010 12:14:04 +0200 Subject: [PATCH] KVM: SVM: Restore unconditional cr0 intercept under npt Currently we don't intercept cr0 at all when npt is enabled. This improves performance but requires us to activate the fpu at all times. Remove this behaviour in preparation for adding selective cr0 intercepts. Acked-by: Joerg Roedel Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 29 +++++++---------------------- 1 file changed, 7 insertions(+), 22 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 949990e4a22e..27273ed24c41 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -643,10 +643,8 @@ static void init_vmcb(struct vcpu_svm *svm) control->intercept &= ~((1ULL << INTERCEPT_TASK_SWITCH) | (1ULL << INTERCEPT_INVLPG)); control->intercept_exceptions &= ~(1 << PF_VECTOR); - control->intercept_cr_read &= ~(INTERCEPT_CR0_MASK| - INTERCEPT_CR3_MASK); - control->intercept_cr_write &= ~(INTERCEPT_CR0_MASK| - INTERCEPT_CR3_MASK); + control->intercept_cr_read &= ~INTERCEPT_CR3_MASK; + control->intercept_cr_write &= ~INTERCEPT_CR3_MASK; save->g_pat = 0x0007040600070406ULL; save->cr3 = 0; save->cr4 = 0; @@ -982,15 +980,13 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) } } #endif - if (npt_enabled) - goto set; - vcpu->arch.cr0 = cr0; - cr0 |= X86_CR0_PG | X86_CR0_WP; + + if (!npt_enabled) + cr0 |= X86_CR0_PG | X86_CR0_WP; if (!vcpu->fpu_active) cr0 |= X86_CR0_TS; -set: /* * re-enable caching here because the QEMU bios * does not do it - this results in some delay at @@ -2386,21 +2382,10 @@ static int handle_exit(struct kvm_vcpu *vcpu) svm_complete_interrupts(svm); - if (npt_enabled) { - int mmu_reload = 0; - if ((kvm_read_cr0_bits(vcpu, X86_CR0_PG) ^ svm->vmcb->save.cr0) - & X86_CR0_PG) { - svm_set_cr0(vcpu, svm->vmcb->save.cr0); - mmu_reload = 1; - } + if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR0_MASK)) vcpu->arch.cr0 = svm->vmcb->save.cr0; + if (npt_enabled) vcpu->arch.cr3 = svm->vmcb->save.cr3; - if (mmu_reload) { - kvm_mmu_reset_context(vcpu); - kvm_mmu_load(vcpu); - } - } - if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) { kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY; -- 2.20.1