Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()

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To: Tom Lendacky <thomas.lendacky@xxxxxxx>
Subject: Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Tue, 17 Aug 2021 20:39:43 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, platform-driver-x86@xxxxxxxxxxxxxxx, linux-graphics-maintainer@xxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, kexec@xxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Brijesh Singh <brijesh.singh@xxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>
In-reply-to: <f4b8bc3c-5158-cd04-6e12-77f08036ea19@amd.com>
References: <cover.1628873970.git.thomas.lendacky@amd.com> <7d55bac0cf2e73f53816bce3a3097877ed9663f3.1628873970.git.thomas.lendacky@amd.com> <YRgUxyhoqVJ0Kxvt@zn.tnic> <4710eb91-d054-7b31-5106-09e3e54bba9e@amd.com> <YRknDQGUJJ/j9pth@zn.tnic> <f4b8bc3c-5158-cd04-6e12-77f08036ea19@amd.com>

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

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References:
- [PATCH v2 00/12] Implement generic prot_guest_has() helper function
  - From: Tom Lendacky
- [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()
  - From: Tom Lendacky
- Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()
  - From: Borislav Petkov
- Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()
  - From: Tom Lendacky
- Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()
  - From: Borislav Petkov
- Re: [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has()
  - From: Tom Lendacky

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