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

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Message-ID: <Z9CDjecpydOsRhUy@suse.de>
Date: Tue, 11 Mar 2025 19:40:13 +0100
From: Joerg Roedel <jroedel@...e.de>
To: Alexey Gladkov <legion@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>,
	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>, 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 07:24:09PM +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.

Regards,

-- 
Jörg Rödel
jroedel@...e.de

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