KVM: x86: Fix nmi injection failure when vcpu got blocked

When spin_lock_irqsave() deadlock occurs inside the guest, vcpu threads,
other than the lock-holding one, would enter into S state because of
pvspinlock. Then inject NMI via libvirt API "inject-nmi", the NMI could
not be injected into vm.

The reason is:
1 It sets nmi_queued to 1 when calling ioctl KVM_NMI in qemu, and sets
cpu->kvm_vcpu_dirty to true in do_inject_external_nmi() meanwhile.
2 It sets nmi_queued to 0 in process_nmi(), before entering guest, because
cpu->kvm_vcpu_dirty is true.

It's not enough just to check nmi_queued to decide whether to stay in
vcpu_block() or not. NMI should be injected immediately at any situation.
Add checking nmi_pending, and testing KVM_REQ_NMI replaces nmi_queued
in vm_vcpu_has_events().

Do the same change for SMIs.

Signed-off-by: Zhuang Yanying <ann.zhuangyanying@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 02363e37d4a61e8271d7fed0a8c534e9dd90f264..a2cd0997343c485051e849551b9fc9d904177fe0 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8394,10 +8394,13 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
        if (vcpu->arch.pv.pv_unhalted)
                return true;
 
-       if (atomic_read(&vcpu->arch.nmi_queued))
+       if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
+           (vcpu->arch.nmi_pending &&
+            kvm_x86_ops->nmi_allowed(vcpu)))
                return true;
 
-       if (kvm_test_request(KVM_REQ_SMI, vcpu))
+       if (kvm_test_request(KVM_REQ_SMI, vcpu) ||
+           (vcpu->arch.smi_pending && !is_smm(vcpu)))
                return true;
 
        if (kvm_arch_interrupt_allowed(vcpu) &&