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

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Message-ID: <20191121221234.GE16617@linux.intel.com>
Date:   Thu, 21 Nov 2019 14:12:34 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Borislav Petkov <bp@...en8.de>
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 12:05:33PM +0100, Borislav Petkov wrote:
> On Thu, Nov 21, 2019 at 12:41:45PM +0200, Jarkko Sakkinen wrote:
> > On Thu, Nov 21, 2019 at 12:39:25PM +0200, Jarkko Sakkinen wrote:
> > > > +void init_feature_control_msr(struct cpuinfo_x86 *c)
> > 
> > I'd also use here shorter init_feat_ctl_msr(). It has one call site
> > but shorter name is more convenient when playing with tracing tools.
> 
> Yeah, and since we're shortening all to feat_ctl, let's do:
> 
> mv arch/x86/kernel/cpu/feature_control.c arch/x86/kernel/cpu/feat_ctl.c

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?