Re: [PATCHv6 00/16] x86/tdx: Add kexec support

[Paolo Bonzini]

On Tue, Jan 30, 2024 at 3:34 PM Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
>
> On Tue, Jan 30, 2024 at 02:43:15PM +0100, Paolo Bonzini wrote:
> > On 1/24/24 13:55, Kirill A. Shutemov wrote:
> > > The patchset adds bits and pieces to get kexec (and crashkernel) work on
> > > TDX guest.
> > >
> > > The last patch implements CPU offlining according to the approved ACPI
> > > spec change poposal[1]. It unlocks kexec with all CPUs visible in the target
> > > kernel. It requires BIOS-side enabling. If it missing we fallback to booting
> > > 2nd kernel with single CPU.
> > >
> > > Please review. I would be glad for any feedback.
> >
> > Hi Kirill,
> >
> > I have a very basic question: is there a reason why this series does not
> > revert commit cb8eb06d50fc, "x86/virt/tdx: Disable TDX host support when
> > kexec is enabled"?
>
> My patchset enables kexec for TDX guest. The commit you refer blocks kexec
> for host. TDX host and guest have totally different problems with handling
> kexec. Kai looks on how to get host kexec functional.

Yeah, that was right there in the cover letter (and I should have
gotten a clue from the many references to CC_* constants...). Somebody
pointed me to this series as "the TDX kexec series from Intel" and I
had some tunnel vision issues. Sorry for the noise!

But since I have your attention, do you have a pointer to the
corresponding edk2 series? Thanks,

Paolo