Re: [PATCH 0/5] KVM: VMX: Fix MMIO Stale Data Mitigation

[Pawan Gupta]

On Mon, Jun 02, 2025 at 04:41:35PM -0700, Sean Christopherson wrote:
> > Regarding validating this, if VERW is executed at VMenter, mitigation was
> > found to be effective. This is similar to other bugs like MDS. I am not a
> > virtualization expert, but I will try to validate whatever I can.
> 
> If you can re-verify the mitigation works for VFIO devices, that's more than
> good enough for me.  The bar at this point is to not regress the existing mitigation,
> anything beyond that is gravy.

Ok sure. I'll verify that VERW is getting executed for VFIO devices.

> I've verified the KVM mechanics of tracing MMIO mappings fairly well (famous last
> words), the only thing I haven't sanity checked is that the existing coverage for
> VFIO devices is maintained.