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

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Message-ID: <dzs3mxfvac2t7itqcv2vnz3cidspwvjinimkbn3ddygxunc2q3@akdoea7e2gon>
Date: Wed, 12 Mar 2025 09:19:30 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Joerg Roedel <jroedel@...e.de>
Cc: Alexey Gladkov <legion@...nel.org>, Borislav Petkov <bp@...en8.de>, 
	Jürgen Groß <jgross@...e.com>, Joerg Roedel <joro@...tes.org>, 
	"Alexey Gladkov (Intel)" <alexey.gladkov@...el.com>, Dave Hansen <dave.hansen@...el.com>, 
	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 Tue, Mar 11, 2025 at 07:40:13PM +0100, Joerg Roedel wrote:
> On Tue, Mar 11, 2025 at 07:24:09PM +0100, Alexey Gladkov wrote:
> > On Tue, Mar 11, 2025 at 12:07:48PM +0100, Borislav Petkov wrote:
> > > On Tue, Mar 11, 2025 at 11:22:23AM +0100, Jürgen Groß wrote:
> > > > I can live with that, as long as we make it possible to make e.g.
> > > > /sys/guest/xen a link to /sys/hypervisor (if xen is the hypervisor
> > > > the guest is directly running on). This means that /sys/guest/*/type
> > > > should not conflict with /sys/hypervisor/type.
> > > 
> > > Yeah, so Joerg and I came up with this on IRC:
> > > 
> > > /sys/hypervisor/{sev,tdx}
> > 
> > This directory is for guest-side information, right ?
> > 
> > > 
> > > * It should not disturb the current hierarchy there
> > > 
> > > * No need for a new hierarchy like /sys/guest - we haz enough and besides,
> > > /sys/hypervisor sounds like the right place already
> > 
> > The /sys/hypervisor is for host-side information ?
> 
> No, all under /sys/hypervisor is for guest-side information. There is
> not directory for host-side information yet. The question is whether a
> directory in SYSFS is needed, or whether there are other means to expose
> the same information.

TDX module information (version, supported features, etc) is crucial for
bug reporting. I think it makes sense to present it in sysfs.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov