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Date:   Tue, 19 Oct 2021 16:47:25 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Brijesh Singh <brijesh.singh@amd.com>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
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        "H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
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Subject: Re: [PATCH v6 09/42] x86/sev: Check SEV-SNP features support
Message-ID: <YW7afYTDgZce/Rzr@zn.tnic>
References: <20211008180453.462291-1-brijesh.singh@amd.com>
 <20211008180453.462291-10-brijesh.singh@amd.com>
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On Fri, Oct 08, 2021 at 01:04:20PM -0500, Brijesh Singh wrote:
> +static bool do_early_sev_setup(void)
>  {
>  	if (!sev_es_negotiate_protocol())
>  		sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SEV_ES_PROT_UNSUPPORTED);
>  
> +	/*
> +	 * If SEV-SNP is enabled, then check if the hypervisor supports the SEV-SNP
> +	 * features.

This and the other comment should say something along the lines of:

"SNP is supported in v2 of the GHCB spec which mandates support for HV
features."

because it wasn't clear to me why we're enforcing that support here.

Thx.

-- 
Regards/Gruss,
    Boris.

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