From 649d68643ebf02f31859ffbb16676aa44c72e6e9 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Wed, 16 Apr 2008 16:51:15 +0200 Subject: [PATCH] KVM: SVM: sync TPR value to V_TPR field in the VMCB This patch adds syncing of the lapic.tpr field to the V_TPR field of the VMCB. With this change we can safely remove the CR8 read intercept. Signed-off-by: Joerg Roedel Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 3379e13d9b2c..f8ce36e6690c 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -486,8 +486,7 @@ static void init_vmcb(struct vcpu_svm *svm) control->intercept_cr_read = INTERCEPT_CR0_MASK | INTERCEPT_CR3_MASK | - INTERCEPT_CR4_MASK | - INTERCEPT_CR8_MASK; + INTERCEPT_CR4_MASK; control->intercept_cr_write = INTERCEPT_CR0_MASK | INTERCEPT_CR3_MASK | @@ -1621,6 +1620,19 @@ static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu) { } +static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + u64 cr8; + + if (!irqchip_in_kernel(vcpu->kvm)) + return; + + cr8 = kvm_get_cr8(vcpu); + svm->vmcb->control.int_ctl &= ~V_TPR_MASK; + svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK; +} + static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { struct vcpu_svm *svm = to_svm(vcpu); @@ -1630,6 +1642,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) pre_svm_run(svm); + sync_lapic_to_cr8(vcpu); + save_host_msrs(vcpu); fs_selector = read_fs(); gs_selector = read_gs(); -- 2.20.1