linux-kernel - Re: [PATCH] x86/CPU/AMD, mm: Extend with mem

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Message-ID: <20171003112024.wzkqvanszmdp4vxn@pd.tnic>
Date:   Tue, 3 Oct 2017 13:20:24 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/CPU/AMD, mm: Extend with mem_encrypt=sme option

On Tue, Oct 03, 2017 at 12:50:15PM +0200, Paolo Bonzini wrote:
> Stupid question ahead: if it's just about guests, why bother with
> mem_encrypt=xxx at all?  kvm_amd should have a sev parameter anyway, you
> can just do kvm_amd.sev=0 to disable it.

Yes, it is only about guests so this could be a viable solution too.
I initially wanted to be able to disable all that SEV code but from a
quick glance over it, it is mostly behind an if (sev_active()) check so
I think the module arg should be good enough too.

Thx.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--