linux-kernel - Re: [PATCH v5 75/75] x86/sev-es: Check required CPU features for SEV-ES

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Message-ID: <202007241055.655EFCB4@keescook>
Date:   Fri, 24 Jul 2020 10:55:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     x86@...nel.org, Joerg Roedel <jroedel@...e.de>,
        Martin Radev <martin.b.radev@...il.com>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v5 75/75] x86/sev-es: Check required CPU features for
 SEV-ES

On Fri, Jul 24, 2020 at 06:03:36PM +0200, Joerg Roedel wrote:
> From: Martin Radev <martin.b.radev@...il.com>
> 
> Make sure the machine supports RDRAND, otherwise there is no trusted
> source of of randomness in the system.
> 
> To also check this in the pre-decompression stage, make has_cpuflag
> not depend on CONFIG_RANDOMIZE_BASE anymore.
> 
> Signed-off-by: Martin Radev <martin.b.radev@...il.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook