linux-kernel - RE: [PATCH 00/11] Provide SEV-SNP support for running under an SVSM

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Message-ID: <DM8PR11MB5750732DCF06F31E7A903E56E7592@DM8PR11MB5750.namprd11.prod.outlook.com>
Date: Tue, 27 Feb 2024 14:56:14 +0000
From: "Reshetova, Elena" <elena.reshetova@...el.com>
To: Tom Lendacky <thomas.lendacky@....com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "x86@...nel.org" <x86@...nel.org>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, "Peter
 Zijlstra" <peterz@...radead.org>, "Williams, Dan J"
	<dan.j.williams@...el.com>, Michael Roth <michael.roth@....com>, Ashish Kalra
	<ashish.kalra@....com>, "Shutemov, Kirill" <kirill.shutemov@...el.com>,
	"Dong, Eddie" <eddie.dong@...el.com>, Jeremi Piotrowski
	<jpiotrowski@...ux.microsoft.com>
Subject: RE: [PATCH 00/11] Provide SEV-SNP support for running under an SVSM

> > Kirill already commented on this, and the answer is of course we can, but imo
> we
> > need to see a bigger picture first. If we go with option 2 above, then coming
> with a
> > joint protocol is only limitedly useful because likely we wont be able to share
> the
> > code in the guest kernel. Ideally I think we want a common concept and a
> common
> > protocol that we can share in both guest kernel and coconut-svsm.
> >
> > Btw, is continuing discussion here the best/preferred/efficient way forward?
> Or should we
> > setup a call with anyone who is interested in the topic to form a joint
> understanding
> > on what can be done here?
> 
> I'm not sure what the best way forward is since I'm not sure what a common
> concept / common protocol would look like. If you feel we can effectively
> describe it via email, then we should continue that, maybe on a new thread
> under linux-coco. If not, then a call might be best.

OK, let us first put some proposal from our side on how this potentially could 
look like. It might be easier to have a discussion against smth more concrete. 

Best Regards,
Elena. 

> 
> Thanks,
> Tom
> 
> >
> > Best Regards,
> > Elena.
> >
> >
> >>
> >> Thanks,
> >> Tom
> >>
> >>>
> >>> 5. Anything else is missing?
> >>>
> >>> References:
> >>>
> >>> [1] https://lkml.org/lkml/2023/11/22/1089
> >>>
> >>> [2] MSFT hyper-v implementation of AMD SEV-SNP !VMPL0 guest and TDX L2
> >>> partitioning guest:
> >>> https://elixir.bootlin.com/linux/latest/source/arch/x86/hyperv/ivm.c#L575
> >>>
> >>> [3] https://github.com/coconut-svsm/svsm
> >>>
> >>> [4] https://www.amd.com/content/dam/amd/en/documents/epyc-
> technical-
> >> docs/specifications/58019.pdf
> >>>
> >>>