On 10/11/2017 19:06, Radim Krčmář wrote:
>> /* the PIR and ON have been set by L1. */
>> if (!kvm_vcpu_trigger_posted_interrupt(vcpu, true)) {
> This would still fail on the exiting case.
>
> If one VCPU was just after a VM exit, then the sender would see it
> IN_GUEST_MODE, send the posted notification and return true, but the
> notification would do nothing
It would cause *something*---a vmexit because the vector doesn't match
the L1 posted interrupt. Then smp_kvm_posted_intr_nested_ipi would be
invoked from vmx_handle_external_intr.
Could we detect the vector in vmx_handle_external_intr and set
pi_pending+KVM_REQ_EVENT? Or invoke a function in KVM from
smp_kvm_posted_intr_nested_ipi? Or would both be insane?...
Thanks,
Paolo
> and we didn't set vmx->nested.pi_pending =
> true, so the interrupt would not get handled until the next posted
> notification or nested VM entry.
>
