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authorSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>2017-09-12 10:42:42 -0500
committerRadim Krčmář <rkrcmar@redhat.com>2017-09-14 17:05:13 +0200
commit67034bb9dd5ecc0171bdacfbd31ebf7c2634df98 (patch)
treec9d34283e272a3244cf42c900eb226bb1aa35e01
parentb2a05feff274e007abd7cda0d2cdae7fdf5cbb0a (diff)
KVM: SVM: Add irqchip_split() checks before enabling AVIC
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 <pbonzini@redhat.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Fixes: 44a95dae1d22 ("KVM: x86: Detect and Initialize AVIC support") [Removed pr_debug - Radim.] Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
-rw-r--r--arch/x86/kvm/svm.c9
1 files 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;