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

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Date: Tue, 30 Jan 2024 17:15:21 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, 
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>, Elena Reshetova <elena.reshetova@...el.com>, 
	Jun Nakajima <jun.nakajima@...el.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, 
	Tom Lendacky <thomas.lendacky@....com>, "Kalra, Ashish" <ashish.kalra@....com>, 
	Sean Christopherson <seanjc@...gle.com>, "Huang, Kai" <kai.huang@...el.com>, Baoquan He <bhe@...hat.com>, 
	kexec@...ts.infradead.org, linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 00/16] x86/tdx: Add kexec support

On Tue, Jan 30, 2024 at 03:59:34PM +0100, Paolo Bonzini wrote:
> On Tue, Jan 30, 2024 at 3:34 PM Kirill A. Shutemov
> <kirill.shutemov@...ux.intel.com> 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?

Relevant code can be found here:

https://github.com/tianocore/edk2-staging/commits/tdvf-kexec/

-- 
  Kiryl Shutsemau / Kirill A. Shutemov