Re: [RFC PATCH v3 3/5] KVM: x86: Add notifications for Heki policy configuration and violation

[Mickaël Salaün]

On Fri, May 10, 2024 at 10:07:00AM +0000, Nicolas Saenz Julienne wrote:
> On Tue May 7, 2024 at 4:16 PM UTC, Sean Christopherson wrote:
> > > If yes, that would indeed require a *lot* of work for something we're not
> > > sure will be accepted later on.
> >
> > Yes and no.  The AWS folks are pursuing VSM support in KVM+QEMU, and SVSM support
> > is trending toward the paired VM+vCPU model.  IMO, it's entirely feasible to
> > design KVM support such that much of the development load can be shared between
> > the projects.  And having 2+ use cases for a feature (set) makes it _much_ more
> > likely that the feature(s) will be accepted.
> 
> Since Sean mentioned our VSM efforts, a small update. We were able to
> validate the concept of one KVM VM per VTL as discussed in LPC. Right
> now only for single CPU guests, but are in the late stages of bringing
> up MP support. The resulting KVM code is small, and most will be
> uncontroversial (I hope). If other obligations allow it, we plan on
> having something suitable for review in the coming months.

Looks good!

> 
> Our implementation aims to implement all the VSM spec necessary to run
> with Microsoft Credential Guard. But note that some aspects necessary
> for HVCI are not covered, especially the ones that depend on MBEC
> support, or some categories of secure intercepts.

We already implemented support for MBEC, so that should not be an issue.
We just need to find the best interface to configure it.

> 
> Development happens
> https://github.com/vianpl/{linux,qemu,kvm-unit-tests} and the vsm-next
> branch, but I'd advice against looking into it until we add some order
> to the rework. Regardless, feel free to get in touch.

Thanks for the update.

Could we schedule a PUCK meeting to synchronize and help each other?
What about June 12?