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

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Message-ID: <a01ee720-e9cf-2ecb-8288-7d86c5a46d86@redhat.com>
Date:   Tue, 3 Oct 2017 12:50:15 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Brijesh Singh <brijesh.singh@....com>, Borislav Petkov <bp@...e.de>
Cc:     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 02/10/2017 17:07, Brijesh Singh wrote:
> 
> 
> Yep, that will work just fine. There are couple of ways we can limit
> hypervisor from creating the SEV guest 1) clear the X86_FEATURE_SEV bit
> when mem_encrypt=sme is passed or 2) parse the mem_encrypt=xxx in
> kvm-amd.ko
> and fail the KVM_SEV_INIT when mem_encrpt=sme or mem_encrypt=off.

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.

Paolo