linux-kernel - Re: [PATCH v7 0/5] Allow guest access to EFI confidential computing secret area

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Date:   Wed, 2 Feb 2022 08:22:03 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Matthew Garrett <mjg59@...f.ucam.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        James Bottomley <jejb@...ux.ibm.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        linux-efi <linux-efi@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>,
        Ashish Kalra <ashish.kalra@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrew Scull <ascull@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Lenny Szubowicz <lszubowi@...hat.com>,
        Peter Gonda <pgonda@...gle.com>,
        Tobin Feldman-Fitzthum <tobin@...ux.ibm.com>,
        Jim Cadden <jcadden@....com>,
        Daniele Buono <dbuono@...ux.vnet.ibm.com>,
        linux-coco@...ts.linux.dev, linux-security-module@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nayna Jain <nayna@...ux.ibm.com>, dougmill@...ux.vnet.ibm.com,
        gcwilson@...ux.ibm.com, gjoyce@....com,
        "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Daniel Axtens <dja@...ens.net>
Subject: Re: [PATCH v7 0/5] Allow guest access to EFI confidential computing
 secret area

On Wed, 2 Feb 2022 at 08:10, Matthew Garrett <mjg59@...f.ucam.org> wrote:
>
> On Wed, Feb 02, 2022 at 08:05:23AM +0100, Greg KH wrote:
>
> > I see different platform patches trying to stick these blobs in
> > different locations and ways to access (securityfs, sysfs, char device
> > node), which seems crazy to me.  Why can't we at least pick one way to
> > access these to start with, and then have the filesystem layout be
> > platform-specific as needed, which will give the correct hints to
> > userspace as to what it needs to do here?
>
> Which other examples are you thinking of? I think this conversation may
> have accidentally become conflated with a different prior one and now
> we're talking at cross purposes.

This came up a while ago during review of one of the earlier revisions
of this patch set.

https://lore.kernel.org/linux-efi/YRZuIIVIzMfgjtEl@google.com/

which describes another two variations on the theme, for pKVM guests
as well as Android bare metal.