linux-kernel - Re: [PATCH] x86/efi: Access EFI MMIO data as unencrypted when SEV is active

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Message-ID: <20180703214604.GA15516@zn.tnic>
Date:   Tue, 3 Jul 2018 23:46:05 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        KVM devel mailing list <kvm@...r.kernel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH] x86/efi: Access EFI MMIO data as unencrypted when SEV is
 active

On Tue, Jul 03, 2018 at 04:16:57PM -0500, Brijesh Singh wrote:
> I agree with Ard,  it may be good idea to extend the UEFI spec to
> include encryption information. Having this information may be helpful
> in some cases, e.g if we ever need to map a specific non IO memory as
> unencrypted. So far we have not seen the need for it. But I will ask AMD
> folks working closely with UEFI committee to float this and submit it as
> enhancement in Tianocore BZ.

Except that if the IO memory handling unencrypted changes in future
incarnations, the changes to the spec become moot. I'm just saying...

-- 
Regards/Gruss,
    Boris.

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