Date:   Thu, 16 Feb 2023 12:25:28 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     Juergen Gross <jgross@suse.com>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org,
        lists@nerdbynature.de, mikelley@microsoft.com,
        torvalds@linux-foundation.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 2/8] x86/mtrr: support setting MTRR state for software
 defined MTRRs
Message-ID: <Y+4SqDN2Hssau4fq@zn.tnic>
References: <20230209072220.6836-1-jgross@suse.com>
 <20230209072220.6836-3-jgross@suse.com>
 <Y+ohfE/wICFKO/93@zn.tnic>
 <cc6c58a8-b162-a6eb-37d4-40786f532837@suse.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <cc6c58a8-b162-a6eb-37d4-40786f532837@suse.com>
Precedence: bulk

On Thu, Feb 16, 2023 at 10:32:28AM +0100, Juergen Gross wrote:
> Is that flag _really_ meant to indicate we are running as a SEV-SNP guest?

Yes.

> Given that the referenced patch is part of the SEV-SNP host support series,
> I'm inclined to suspect it won't be set for sure in HyperV SEV-SNP guests.

It better be. If it is a modified guest - no matter how modified - it
should set that flag. The vTOM thing is still being discussed.

> And who is setting it for KVM SEV-SNP guests?

That same patch does.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette