linux-kernel - Re: [PATCH v6 39/76] x86/sev-es: Add SEV-ES Feature Detection

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Date:   Sat, 29 Aug 2020 18:25:24 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Joerg Roedel <joro@...tes.org>
Cc:     x86@...nel.org, Joerg Roedel <jroedel@...e.de>,
        Kees Cook <keescook@...omium.org>, 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>,
        Martin Radev <martin.b.radev@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v6 39/76] x86/sev-es: Add SEV-ES Feature Detection

On Mon, Aug 24, 2020 at 10:54:34AM +0200, Joerg Roedel wrote:
> +/* Needs to be called from non-instrumentable code */
> +bool noinstr sev_es_active(void)
> +{
> +	return !!(sev_status & MSR_AMD64_SEV_ES_ENABLED);

You don't need the "!!" since you're returning bool.

-- 
Regards/Gruss,
    Boris.

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