[RFC PATCH v3 28/59] KVM: x86: Check for pending APICv interrupt in kvm_vcpu_has_events()

isaku.yamahata
2021-11-25T00:22:41Z

From: Sean Christopherson <sean.j.christopherson@intel.com>

Return true for kvm_vcpu_has_events() if the vCPU has a pending APICv
interrupt to support TDX's usage of APICv. Unlike VMX, TDX doesn't have
access to vmcs.GUEST_INTR_STATUS and so can't emulate posted interrupts,
i.e. needs to generate a posted interrupt and more importantly can't
manually move requested interrupts into the vIRR (which it also doesn't
have access to).

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/x86.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8161475082a7..c6e56f105673 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11914,7 +11914,9 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)

if (kvm_arch_interrupt_allowed(vcpu) &&
(kvm_cpu_has_interrupt(vcpu) ||
- kvm_guest_apic_has_interrupt(vcpu)))
+ kvm_guest_apic_has_interrupt(vcpu) ||
+ (vcpu->arch.apicv_active &&
+ kvm_x86_ops.dy_apicv_has_pending_interrupt(vcpu))))
return true;

if (kvm_hv_has_stimer_pending(vcpu))
--
2.25.1