[PATCH 1/6] KVM: vmx: clear pending interrupts on KVM_SET_LAPIC

Paolo Bonzini
2016-12-19T16:21:42Z

Pending interrupts might be in the PI descriptor when the
LAPIC is restored from an external state; we do not want
them to be injected.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/lapic.c | 3 +--
arch/x86/kvm/vmx.c | 9 +++++++++
2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 4dc02482faf7..5fa546e27b7e 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2185,8 +2185,7 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
1 : count_vectors(apic->regs + APIC_ISR);
apic->highest_isr_cache = -1;
if (vcpu->arch.apicv_active) {
- if (kvm_x86_ops->apicv_post_state_restore)
- kvm_x86_ops->apicv_post_state_restore(vcpu);
+ kvm_x86_ops->apicv_post_state_restore(vcpu);
kvm_x86_ops->hwapic_irr_update(vcpu,
apic_find_highest_irr(apic));
kvm_x86_ops->hwapic_isr_update(vcpu,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1ba7aaf6ae7f..661956caf162 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8761,6 +8761,14 @@ static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]);
}

+static void vmx_apicv_post_state_restore(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ pi_clear_on(&vmx->pi_desc);
+ memset(vmx->pi_desc.pir, 0, sizeof(vmx->pi_desc.pir));
+}
+
static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
{
u32 exit_intr_info;
@@ -11590,6 +11598,7 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
.get_enable_apicv = vmx_get_enable_apicv,
.refresh_apicv_exec_ctrl = vmx_refresh_apicv_exec_ctrl,
.load_eoi_exitmap = vmx_load_eoi_exitmap,
+ .apicv_post_state_restore = vmx_apicv_post_state_restore,
.hwapic_irr_update = vmx_hwapic_irr_update,
.hwapic_isr_update = vmx_hwapic_isr_update,
.sync_pir_to_irr = vmx_sync_pir_to_irr,
--
1.8.3.1