linux-kernel - Re: [PATCH] x86/sev: Make SEV

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Message-ID: <Z88KNWJ-6SsT4NPZ@example.org>
Date: Mon, 10 Mar 2025 16:50:13 +0100
From: Alexey Gladkov <legion@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Jürgen Groß <jgross@...e.com>,
	Joerg Roedel <joro@...tes.org>,
	"Alexey Gladkov (Intel)" <alexey.gladkov@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...el.com>, Joerg Roedel <jroedel@...e.de>,
	Ingo Molnar <mingo@...nel.org>, x86@...nel.org, hpa@...or.com,
	Tom Lendacky <thomas.lendacky@....com>,
	Nikunj A Dadhania <nikunj@....com>, linux-kernel@...r.kernel.org,
	Larry.Dewey@....com
Subject: Re: [PATCH] x86/sev: Make SEV_STATUS available via SYSFS

On Mon, Mar 10, 2025 at 04:41:52PM +0100, Borislav Petkov wrote:
> On Mon, Mar 10, 2025 at 04:33:08PM +0100, Jürgen Groß wrote:
> > Kind of.
> > 
> > /sys/hypervisor is meant to provide data for running under a hypervisor.
> > 
> > It is NOT meant to provide data for running as a hypervisor.
> 
> Hah.
> 
> Which would mean that
> 
> /sys/hypervisor == /sys/guest
> 
> the way we envision it.
> 
> Do we need to dump all the HV levels in it?

Hm. We already have:

/sys/hypervisor/type        (Type of hypervisor)
/sys/hypervisor/guest_type  (Type of guest)

I don't really understand how you propose to locate the files for host and
guest and what you propose to put in /sys/guest.

> I think Joerg wants to dump the fact that there's an SVSM present. I guess we
> can dump the "stack" of "things" running under Linux as you suggest it.
> 
> Hmmm.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette
> 

-- 
Rgrds, legion