Re: [PATCH v2] KVM: nVMX: Fix attempting to emulate "Acknowledge interrupt on exit" when there is no interrupt which L1 requires to inject to L2

From: Jim Mattson
Date: Fri Oct 18 2019 - 17:12:29 EST

On Thu, Aug 3, 2017 at 6:23 PM Wanpeng Li <kernellwp@xxxxxxxxx> wrote:

> Thanks Radim. :) In addition, I will think more about it and figure
> out a finial solution.

Have you had any thoughts on a final solution? We're seeing incorrect
behavior with an L1 hypervisor running under qemu with "-machine
q35,kernel-irqchip=split", and I believe this may be the cause.

In particular, VMCS12 has ACK_INTERRUPT_ON_EXIT set, but L1 is seeing
an L2 exit for "external interrupt" with the VMCS12 VM-exit
interruption information cleared to 0.