Re: [RFC] virtio-villain: Guest fault injection for VMM robustness

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sat, Jul 04, 2026 at 03:37:21PM +0200, Anatol Belski wrote:
> Hi,
> 
> I would like to share virtio-villain, a guest side fault injection
> harness for virtio device models. The repository is at
> https://github.com/weltling/virtio-villain
> 
> Comments on the approach, the coverage so far, and test cases worth
> adding are all welcome. While the tool targets multiple hypervisors,
> QEMU support is active and has already surfaced a few initial bugs.

snip

> Impact. Many findings have led to substantial improvements in
> virtio spec compliance and stability in Cloud Hypervisor, from
> input validation gaps to a config read that could take down a VM
> on aarch64. In QEMU the harness has surfaced a few guest triggered
> hangs and a double completion. The repository README lists the
> details with PR links and the test ID for each.

The README only lists  cloud hypervisor bugs.  Did you file any for
QEMU yet ?


If this is finding bugs in QEMU this test harness sounds like the kind
of thing we ought to have integrated in QEMU's meson test suite such
that it runs in CI to prevent regressions.

With regards,
Daniel
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