Re: [PATCH] KVM: x86: Clear CR3[63:32] on SMM entry from long mode

[Wei Liu]

On Tue, Sep 29, 2026 at 08:57:55AM +0800, Qiliang Yuan wrote:
> On Mon, Sep 28, 2026 at 10:42:43AM -0700, Wei Liu wrote:
> > Please share the Windows version from `winver`.
> >
> > My colleague said that it had been fixed. Maybe the change needs to be ported.
> 
> Windows 11 Pro, version 25H2, OS build 26200.9457, with WSL 2.9.3.0.
> The host CPU is an AMD Ryzen 9 7940HX.
> 
> This machine is fully up to date through Windows Update, and the failure
> reproduces on this build, so the fix does not seem to have reached the
> released builds yet.  Which build or channel (e.g. Insider) carries it?
> I am happy to test it.

Windows 11 Pro, version 26H1 should have the fix.

Wei

> 
> I have also filed it as a WSL issue, with repro steps and the SMRAM
> analysis: https://github.com/microsoft/WSL/issues/41709
> 
> On Mon, Sep 28, 2026 at 11:19:21AM -0700, Sean Christopherson wrote:
> > Ya, I'd much prefer to get this fixed in Hyper-V.  If we need to carry a KVM hack,
> > then at the very least it should be limited to when KVM detects that it's running
> > on Hyper-V.
> 
> Understood, a Hyper-V fix is the right answer.  Since current released
> builds are affected, I can send a v2 that applies the workaround only
> when KVM is running on Hyper-V, if you'd take that in the meantime.
> Otherwise I'll drop this and wait for the Hyper-V fix to ship.
> 
> Thanks,
> Qiliang