Re: [PATCH v2 2/5] x86/kexec: do unconditional WBINVD in relocate_kernel()

[Huang, Kai]

On 21/03/2024 10:06 am, Tom Lendacky wrote:
> On 3/20/24 15:48, Huang, Kai wrote:
> > > > Hi Tom,
> > > >
> > > > I am not aware of kexec() support status for SEV-ES/SEV-SNP guests. 
> > > > Does patch 1 break them?
> > >
> > > SNP guests can kexec with some patches that are currently in process 
> > > around shared to private memory conversions. ES guests can only kexec 
> > > with a single vCPU. There was a recent patch series to add support 
> > > for multiple vCPUs.
> > >
> > > Patch #1 doesn't break either ES or SNP because we still have an IDT 
> > > and traditional kernel addressing in place, so the #VC can be handled.
> >
> > How about plain SEV guest?
>
> A plain SEV guest is fine, since WBINVD is intercepted and would just 
> exit to the hypervisor (#VC doesn't happen with plain SEV).
>
> Thanks,
> Tom

Thanks for the info.