linux-kernel - Re: [PATCH 01/13] x86/CPU/AMD: Add ZenX generations flags

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Date:   Thu, 30 Nov 2023 12:30:57 -0500
From:   Brian Gerst <brgerst@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Tom Lendacky <thomas.lendacky@....com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/13] x86/CPU/AMD: Add ZenX generations flags

On Thu, Nov 30, 2023 at 12:14 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Thu, Nov 30, 2023 at 11:05:14AM -0600, Tom Lendacky wrote:
> > Previously just being family 17h or 19h would get X86_FEATURE_ZEN set. With
> > this, if the model check doesn't match, you won't get any X86_FEATURE_ZEN*
> > set. Should you do set X86_FEATURE_ZEN here, e.g. lowest common denominator
> > for the family?
>
> My assumption/expectation is that those WARNs should never happen
> because they will be caught early enough in enablement and I will get
> patches.
>
> Besides, X86_FEATURE_ZEN means only Zen1 now.

It should be renamed to X86_FEATURE_ZEN1 for clarity.

Brian Gerst