Introduce avic_update_vapic_bar(), which checks the x2APIC enable bit
of the APIC Base register and update the new struct vcpu_svm.x2apic_enabled
to keep track of current APIC mode of each vCPU,
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
arch/x86/kvm/svm/avic.c | 13 +++++++++++++
arch/x86/kvm/svm/svm.c | 4 ++++
arch/x86/kvm/svm/svm.h | 2 ++
3 files changed, 19 insertions(+)
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 1999076966fd..60f30e48d816 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -609,6 +609,19 @@ void avic_post_state_restore(struct kvm_vcpu *vcpu)
avic_handle_ldr_update(vcpu);
}
+void avic_update_vapic_bar(struct vcpu_svm *svm, u64 data)
+{
+ svm->vmcb->control.avic_vapic_bar = data & VMCB_AVIC_APIC_BAR_MASK;
+
+ /* Set x2APIC mode bit if guest enable x2apic mode. */
+ svm->x2apic_enabled = (avic_mode == AVIC_MODE_X2 &&
+ kvm_apic_mode(data) == LAPIC_MODE_X2APIC);
+ pr_debug("vcpu_id:%d switch to %s\n", svm->vcpu.vcpu_id,
+ svm->x2apic_enabled ? "x2APIC" : "xAPIC");
+ vmcb_mark_dirty(svm->vmcb, VMCB_AVIC);
+ kvm_vcpu_update_apicv(&svm->vcpu);
+}
+
void svm_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
{
return;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 3687026f2859..4e6dc1feeac7 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2867,6 +2867,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
svm->msr_decfg = data;
break;
}
+ case MSR_IA32_APICBASE:
+ if (kvm_vcpu_apicv_active(vcpu))
+ avic_update_vapic_bar(to_svm(vcpu), data);
+ fallthrough;
default:
return kvm_set_msr_common(vcpu, msr);
}
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 1a0bf6b853df..bfbebb933da2 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -225,6 +225,7 @@ struct vcpu_svm {
u32 dfr_reg;
struct page *avic_backing_page;
u64 *avic_physical_id_cache;
+ bool x2apic_enabled;
/*
* Per-vcpu list of struct amd_svm_iommu_ir:
@@ -566,6 +567,7 @@ void avic_init_vmcb(struct vcpu_svm *svm);
int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu);
int avic_unaccelerated_access_interception(struct kvm_vcpu *vcpu);
int avic_init_vcpu(struct vcpu_svm *svm);
+void avic_update_vapic_bar(struct vcpu_svm *svm, u64 data);
void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
void avic_vcpu_put(struct kvm_vcpu *vcpu);
void avic_post_state_restore(struct kvm_vcpu *vcpu);
--
2.25.1
