linux-kernel - Re: [PATCH v2 08/14] x86/fault: Skip erratum #93 workaround on new CPUs

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Message-ID: <20210210132928.GB14650@zn.tnic>
Date:   Wed, 10 Feb 2021 14:29:28 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v2 08/14] x86/fault: Skip erratum #93 workaround on new
 CPUs

On Tue, Feb 09, 2021 at 10:06:02PM -0800, Andy Lutomirski wrote:
> On Tue, Feb 9, 2021 at 6:33 PM Andy Lutomirski <luto@...nel.org> wrote:
> >
> > Erratum #93 applies to the first generation of AMD K8 CPUs.  Skip the
> > workaround on newer CPUs.
> 
> Whoops, this breaks the !CPU_SUP_AMD build.  It needs a fixup like this:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/fault&id=06772a3b6918bf6d6d0778946149b7d56ae30d80
> 
> Boris, do you want a v3?

Do we even want to apply patch 8 at all? This has always ran on K8 NPT
CPUs too and those are pretty much obsolete by now so I'm thinking,
leave sleeping dogs lie...?

-- 
Regards/Gruss,
    Boris.

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