linux-kernel - Re: [PATCH v3 38/75] x86/sev-es: Add SEV-ES Feature Detection

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Date:   Wed, 3 Jun 2020 17:24:36 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, hpa@...or.com, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        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>,
        Joerg Roedel <jroedel@...e.de>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 38/75] x86/sev-es: Add SEV-ES Feature Detection

On Wed, May 20, 2020 at 10:39:16AM +0200, Borislav Petkov wrote:
> On Tue, Apr 28, 2020 at 05:16:48PM +0200, Joerg Roedel wrote:
> > +bool sev_es_active(void)
> > +{
> > +	return !!(sev_status & MSR_AMD64_SEV_ES_ENABLED);
> > +}
> > +EXPORT_SYMBOL_GPL(sev_es_active);
> 
> I don't see this being used in modules anywhere in the patchset. Or am I
> missing something?

It is used in several places, for example do do_nmi() to conditionally
re-open the NMI window in SEV-ES guests. But there are other uses too,
like int sev_es_efi_map_ghcbs() or in sev_es_init_vc_handling() to opt
out if not running as an SEV-ES guest.


	Joerg