linux-kernel - Re: [PATCH v3 04/19] x86/intel: Initialize IA32_FEATURE

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Message-ID: <20191122123433.GH6289@zn.tnic>
Date:   Fri, 22 Nov 2019 13:34:40 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Tony Luck <tony.luck@...el.com>,
        Tony W Wang-oc <TonyWWang-oc@...oxin.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v3 04/19] x86/intel: Initialize IA32_FEATURE_CONTROL MSR
 at boot

On Thu, Nov 21, 2019 at 02:12:34PM -0800, Sean Christopherson wrote:
> Any objection to keeping the MSR name as MSR_IA32_FEATURE_CONTOL?  I'd like
> to have some anchor back to the name used in the SDM.
> 
> Any opinions/thoughts on the name of the Kconfig?  Currently it's
> X86_FEATURE_CONTROL_MSR, which gets a bit long with CONFIG_ on the front.
> I also overlooked that we have MSR_MISC_FEATURE_CONTROL, so having IA32 in
> the Kconfig would probably be a good idea.  X86_IA32 is rather redundant,
> so maybe IA32_FEAT_CTL or IA32_FEATURE_CONTROL?

Well, what I'd do is since we have MSR_MISC_FEATURE_CONTROL too, I'd
call all code and defines pertaining to the 0x3a MSR

<bla>_IA32_FEAT_CTL

I.e.,

CONFIG_IA32_FEAT_CTL,
MSR_IA32_FEAT_CTL,
...

and leave a comment over the MSR definition containing the SDM name.

This way, you have a clear distinction between the IA32 and the MISC
feature control.

But this is just me and I realize we're pretty much deep inside the bike
shed. :)

-- 
Regards/Gruss,
    Boris.

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