Re: [PATCH v3 00/21] Enable CET Virtualization

[Yang, Weijiang]

On 6/16/2023 8:00 AM, Sean Christopherson wrote:
> On Thu, Jun 15, 2023, Sean Christopherson wrote:
> > Your cover letter from v2 back in April said the same thing.  Why hasn't the patch
> > been posted?  And what exactly is the issue?  IIUC, setting CR4.CET with
> > MSR_IA32_S_CET=0 and MSR_IA32_U_CET=0 should be a nop, which suggests that there's
> > a KVM bug.  And if that's the case, the next obvious questions is, why are you
> > posting known buggy code?
> Ah, is the problem that the test doesn't set CR0.WP as required by CR4.CET=1?

Thanks for taking time to review this series!

Yes, due to CR0.WP bit is not set while CR4.CET is being set.

The check is imposed by patch-12.

I'll add the fixup patch together with next the version.