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

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Message-ID: <Z87ce37GjCqpOLCW@8bytes.org>
Date: Mon, 10 Mar 2025 13:35:07 +0100
From: Joerg Roedel <joro@...tes.org>
To: Juergen Gross <jgross@...e.com>
Cc: Alexey Gladkov <legion@...nel.org>,
	"Alexey Gladkov (Intel)" <alexey.gladkov@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...el.com>, Borislav Petkov <bp@...en8.de>,
	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 01:28:38PM +0100, Juergen Gross wrote:
> We can (saying that with my Xen maintainer hat on).
> 
> There is /sys/hypervisor/type which should return the used virtualization
> environment ("xen" when running as a Xen guest).

In CoCo environments there can be more than one hypervisor beneath the
guest. For example KVM as the untrusted host, SVSM or another para-visor
as the trusted in-guest hypervisor. On TDX there is also the TDX module
in-between, which is another level of hypervisors. ARM and Risc-V will
have similar architectures.


Regards,

	Joerg