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

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

On Tue, Jul 07, 2026 at 11:09:12PM +0200, Anatol Belski wrote:
> On Tue, 2026-07-07 at 11:39 +0100, Daniel P. Berrangé wrote:
> 
> > We appreciate the intent not to flood projects ! Feel free to
> > drip-feed issues to us, a handful at a time though over days
> > or weeks if there will be alot to process.
> > 
> > We recently switched our security disclosure process over to using
> > our regular GitLab issue tracker, so would prefer any bugs to be
> > filed there, rather than emailing people directly:
> > 
> >   https://www.qemu.org/contribute/security-process/
> 
> Perfect, that makes it easy. I will file on the GitLab tracker and
> send them in small batches over the next couple of weeks rather than
> all at once. For the ones with a host side impact, a guest triggered
> hang or use after free, I will tick the confidential box and let
> triage decide whether it stays that way.
> 
> 
> > We also have tests/functional/ in QEMU where we boot real guest OS
> > disk images and/or kernel/initrd pairs. The minimal initramfs
> > approach would probably fit in nicely with that, and indeed I have
> > long wanted us to replace some of our full-fat disk images with
> > minimal self contained initramfs images to speed up smoke testing.
> 
> That sounds like a clean fit. The harness already boots a kernel plus
> a tiny initramfs with a single static init and no full OS, so it
> should slot into tests/functional/ with little friction. Each test
> finishes in under a second when passing, since there is no full VM
> boot involved, which makes it suitable for smoke testing too. Would
> it be useful to have these wired in there directly, or is there a
> different shape that would work better for you?

Yes, I think it'd be interesting to try to fit them directly into a
functional test script. I guess having the virtio-villain repo as a
git submodule would probably be the way to go to access the individual
tests to build the initramfs.


With regards,
Daniel
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