Date: Fri, 25 Aug 2017 14:54:31 +0200
From: Borislav Petkov <bp@suse.de>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>, linux-kernel@vger.kernel.org,
        x86@kernel.org, linux-efi@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H . Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>,
        Tony Luck <tony.luck@intel.com>, Piotr Luc <piotr.luc@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>, Lu Baolu <baolu.lu@linux.intel.com>,
        Reza Arbab <arbab@linux.vnet.ibm.com>,
        David Howells <dhowells@redhat.com>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Laura Abbott <labbott@redhat.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Eric Biederman <ebiederm@xmission.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Jonathan Corbet <corbet@lwn.net>, Dave Airlie <airlied@redhat.com>,
        Kees Cook <keescook@chromium.org>, Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>, Tejun Heo <tj@kernel.org>,
        Christoph Lameter <cl@linux.com>
Subject: Re: [RFC Part1 PATCH v3 14/17] x86/boot: Add early boot support when
 running with SEV active
Message-ID: <20170825125431.sjeiwkthrgsk5tke@pd.tnic>
References: <20170724190757.11278-1-brijesh.singh@amd.com>
 <20170724190757.11278-15-brijesh.singh@amd.com>
 <20170823153058.yli5qogrmjl74wkl@pd.tnic>
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Btw,

I don't see our SEV-specific chicken bit which disables SEV only.

Do we need it? If so, maybe something like

mem_encrypt=sme_only

or so.

Or is the mem_encrypt=off chicken bit enough?

What about the use case where you want SME but no encrypted guests?

A bunch of hmmm.

-- 
Regards/Gruss,
    Boris.

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