Re: [PATCH 4/4] kvm: svm: Support KVM_SEV_SNP_PAGE_TYPE_VMSA at SNP_LAUNCH_UPDATE

[Sean Christopherson]

On Wed, Jun 17, 2026, Jörg Rödel wrote:
> On Wed, Jun 17, 2026 at 06:00:39AM -0700, Sean Christopherson wrote:
> > On Wed, Jun 17, 2026, Jörg Rödel wrote:
> > > (which has happened a couple of times already).
> > 
> > Examples?  The SEV features thing jumps to mind, but I don't recall any others
> > off the top of my head.
> 
> I was referring to KVM-induced changes to SEV features, but thought this
> happened more than once?

Ok, so it took us a few times to learn our lesson.  I still don't see that as a
strong argument for new uAPI, especially not for VMSA pages.  I am very firmly
of the opinion that letting anything but the host kernel configure the VMSA is
beyond stupid, but unfortunately we're stuck with AP_CREATION.  Expanding that
surface has a very, very, VERY high bar to get over.