[PATCH 2/6] kvm: nVMX: move nested events check to kvm_vcpu_running

Paolo Bonzini
2016-12-19T16:20:25Z

vcpu_run calls kvm_vcpu_running, not kvm_arch_vcpu_runnable,
and the former does not call check_nested_events.

Once KVM_REQ_EVENT is removed from the APICv interrupt injection
path, however, this would leave no place to trigger a vmexit
from L2 to L1, causing a missed interrupt delivery while in guest
mode. This is caught by the "ack interrupt on exit" test in
vmx.flat.

[This does not change the calls to check_nested_events in
inject_pending_event. That is material for a separate cleanup.]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/x86.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d5a5fc2f8758..32e5f54a8eba 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6920,6 +6920,9 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)

static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
{
+ if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
+ kvm_x86_ops->check_nested_events(vcpu, false);
+
return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted);
}
@@ -8286,9 +8289,6 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
- if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
- kvm_x86_ops->check_nested_events(vcpu, false);
-
return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu);
}

--
1.8.3.1