On 12/11/2015 20:07, Matt Gingell wrote:
> This patch adds a call to kvm_arch_interrupt_allowed to ensure ready for
> interrupt is reported to user space correctly. This addresses a problem
> observed in QEMU when kvm->ready_for_interrupt is set but the x86
> interrupt flag is clear.
>
> Additionally, test that the APIC is ready to accept an interrupt before
> reporting we are ready for injection.
>
> Reviewed-by: Andy Honig <aho...@google.com>
> Signed-off-by: Matt Gingell <ging...@google.com>
I think you need to add the same call to dm_request_for_irq_injection, like
- return (irqchip_split(vcpu->kvm)
- ? kvm_apic_accept_pic_intr(vcpu)
- : kvm_arch_interrupt_allowed(vcpu));
+ if (!kvm_arch_interrupt_allowed(vcpu))
+ return false;
+
+ return !lapic_in_kernel(vcpu) || kvm_apic_accept_pic_intr(vcpu);
At this point, just to err on the safe side, we probably should test
kvm_event_needs_reinjection(vcpu) as well in dm_request_for_irq_injection.
We can then make a new function kvm_vcpu_ready_for_interrupt_injection
with the sequence of tests (kvm_cpu_has_interrupt,
kvm_arch_interrupt_allowed, kvm_event_needs_reinjection, possibly
kvm_apic_accept_pic_intr) so that:
- dm_request_for_irq_injection becomes simply
return (vcpu->run->request_interrupt_window &&
likely(!pic_in_kernel(vcpu->kvm));
- the caller of dm_request_for_irq_injection does
if (dm_request_for_irq_injection(vcpu) &&
kvm_vcpu_ready_for_interrupt_injection(vcpu))
- post_kvm_run_save's assignment becomes
kvm_run->ready_for_interrupt_injection =
!pic_in_kernel(vcpu->kvm) ||
kvm_vcpu_ready_for_interrupt_injection(vcpu);
The code would make a lot of sense then; I hope it will work too. :)
Paolo "ceci n'est pas une patch"
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