linux-kernel - Re: SEV guest regression in 4.18

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Message-ID: <20180822081417.GB4069@nazgul.tnic>
Date:   Wed, 22 Aug 2018 10:14:17 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: SEV guest regression in 4.18

Dropping Pavel as it bounces.

On Tue, Aug 21, 2018 at 11:07:38AM -0500, Brijesh Singh wrote:
> The tsc_early_init() is called before setup_arch() -> init_mem_mapping.

Ok, I see it, thanks for explaining.

So back to your original ideas - I'm wondering whether we should define
a chunk of memory which the hypervisor and guest can share and thus
communicate over... Something ala SEV-ES also with strictly defined
layout and put all those variables there. And then the guest can map
decrypted.

There might be something similar though, I dunno.

Maybe Paolo has a better idea...

-- 
Regards/Gruss,
    Boris.

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