From 67034bb9dd5ecc0171bdacfbd31ebf7c2634df98 Mon Sep 17 00:00:00 2001 From: Suravee Suthikulpanit Date: Tue, 12 Sep 2017 10:42:42 -0500 Subject: [PATCH] KVM: SVM: Add irqchip_split() checks before enabling AVIC MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit SVM AVIC hardware accelerates guest write to APIC_EOI register (for edge-trigger interrupt), which means it does not trap to KVM. So, only enable SVM AVIC only in split irqchip mode. (e.g. launching qemu w/ option '-machine kernel_irqchip=split'). Suggested-by: Paolo Bonzini Signed-off-by: Suravee Suthikulpanit Fixes: 44a95dae1d22 ("KVM: x86: Detect and Initialize AVIC support") [Removed pr_debug - Radim.] Signed-off-by: Radim Krčmář --- arch/x86/kvm/svm.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 76f559f5a3dd..0e68f0b3cbf7 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1200,7 +1200,6 @@ static void avic_init_vmcb(struct vcpu_svm *svm) vmcb->control.avic_physical_id = ppa & AVIC_HPA_MASK; vmcb->control.avic_physical_id |= AVIC_MAX_PHYSICAL_ID_COUNT; vmcb->control.int_ctl |= AVIC_ENABLE_MASK; - svm->vcpu.arch.apicv_active = true; } static void init_vmcb(struct vcpu_svm *svm) @@ -1316,7 +1315,7 @@ static void init_vmcb(struct vcpu_svm *svm) set_intercept(svm, INTERCEPT_PAUSE); } - if (avic) + if (kvm_vcpu_apicv_active(&svm->vcpu)) avic_init_vmcb(svm); /* @@ -1604,7 +1603,7 @@ static int avic_init_vcpu(struct vcpu_svm *svm) { int ret; - if (!avic) + if (!kvm_vcpu_apicv_active(&svm->vcpu)) return 0; ret = avic_init_backing_page(&svm->vcpu); @@ -4409,7 +4408,7 @@ static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set) static bool svm_get_enable_apicv(struct kvm_vcpu *vcpu) { - return avic; + return avic && irqchip_split(vcpu->kvm); } static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr) @@ -4426,7 +4425,7 @@ static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu) struct vcpu_svm *svm = to_svm(vcpu); struct vmcb *vmcb = svm->vmcb; - if (!avic) + if (!kvm_vcpu_apicv_active(&svm->vcpu)) return; vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK; -- 2.20.1