linux-kernel - Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest

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Message-ID: <YRwCb12ilG1uFJO7@zn.tnic>
Date:   Tue, 17 Aug 2021 20:39:43 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-graphics-maintainer@...are.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        kexec@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Joerg Roedel <joro@...tes.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()

On Tue, Aug 17, 2021 at 10:22:52AM -0500, Tom Lendacky wrote:
> I can change it to be an AMD/HYGON check...  although, I'll have to check
> to see if any (very) early use of the function will work with that.

We can always change it later if really needed. It is just that I'm not
a fan of such "preemptive" changes.

> At a minimum, the check in arch/x86/kernel/head64.c will have to be
> changed or removed. I'll take a closer look.

Yeah, sme_me_mask, already discussed on IRC.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette