When async pagefault is resolved vCPU may be executing L2 guest.
In order to allow L1 take better scheduling decisions in such cases,
make L2 exit to L1 on a fake external interupt, without actually
injecting it (unless L2 has other reasons to vmexit).
This patch does that for x86/Intel.
Signed-off-by: Roman Kagan <rkagan@xxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5382b82..fc97489 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10420,7 +10420,8 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
return 0;
}
- if ((kvm_cpu_has_interrupt(vcpu) || external_intr) &&
+ if ((kvm_cpu_has_interrupt(vcpu) || external_intr ||
+ kvm_async_pf_has_ready(vcpu)) &&
nested_exit_on_intr(vcpu)) {
if (vmx->nested.nested_run_pending)
return -EBUSY;
@@ -10772,9 +10773,9 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
if ((exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT)
&& nested_exit_intr_ack_set(vcpu)) {
int irq = kvm_cpu_get_interrupt(vcpu);
- WARN_ON(irq < 0);
- vmcs12->vm_exit_intr_info = irq |
- INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
+ if (irq >= 0)
+ vmcs12->vm_exit_intr_info = irq |
+ INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
}
trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason,
--
2.9.3
--
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