[PATCH v6 09/17] KVM: SVM: Refresh AVIC configuration when changing APIC mode

Suravee Suthikulpanit
2022-05-19T10:29:27Z

AMD AVIC can support xAPIC and x2APIC virtualization,
which requires changing x2APIC bit VMCB and MSR intercepton
for x2APIC MSRs. Therefore, call avic_refresh_apicv_exec_ctrl()
to refresh configuration accordingly.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/kvm/svm/avic.c | 12 ++++++++++++
arch/x86/kvm/svm/svm.c | 1 +
2 files changed, 13 insertions(+)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 7aa75931bec1..aa88cef3d41f 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -685,6 +685,18 @@ void avic_apicv_post_state_restore(struct kvm_vcpu *vcpu)
avic_handle_ldr_update(vcpu);
}

+void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
+{
+ if (!lapic_in_kernel(vcpu) || (avic_mode == AVIC_MODE_NONE))
+ return;
+
+ if (kvm_get_apic_mode(vcpu) == LAPIC_MODE_INVALID) {
+ WARN_ONCE(true, "Invalid local APIC state (vcpu_id=%d)", vcpu->vcpu_id);
+ return;
+ }
+ avic_refresh_apicv_exec_ctrl(vcpu);
+}
+
static int avic_set_pi_irte_mode(struct kvm_vcpu *vcpu, bool activate)
{
int ret = 0;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 2cf6710333f8..31b669f3f3de 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4692,6 +4692,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.enable_nmi_window = svm_enable_nmi_window,
.enable_irq_window = svm_enable_irq_window,
.update_cr8_intercept = svm_update_cr8_intercept,
+ .set_virtual_apic_mode = avic_set_virtual_apic_mode,
.refresh_apicv_exec_ctrl = avic_refresh_apicv_exec_ctrl,
.check_apicv_inhibit_reasons = avic_check_apicv_inhibit_reasons,
.apicv_post_state_restore = avic_apicv_post_state_restore,
--
2.25.1