linux-kernel - Re: [PATCH] x86/sev: Add AMD_SEV_ES_GUEST Kconfig for including SEV-ES support

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Date:   Tue, 19 Jan 2021 18:12:28 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH] x86/sev: Add AMD_SEV_ES_GUEST Kconfig for including
 SEV-ES support

On 19/01/21 18:09, Borislav Petkov wrote:
>> It was the AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT dependency that tripped me up.  To
>> get KVM to enable SEV/SEV-ES by default,
> By default? What would be the use case for that?

It doesn't enable by default SEV/SEV-ES for all the guests, it only 
enables the functionality.

But tying that to a Kconfig value is useless, it should just default to 
1 (allow creating encrypted guests) if the hardware is available.

Paolo