linux-kernel - Re: [PATCH v8 05/15] x86/msr-index: Define MSR_IA32_CORE

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Message-ID: <20190425190148.GA64477@romley-ivt3.sc.intel.com>
Date:   Thu, 25 Apr 2019 12:01:48 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Christopherson Sean J <sean.j.christopherson@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Michael Chan <michael.chan@...adcom.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [PATCH v8 05/15] x86/msr-index: Define MSR_IA32_CORE_CAPABILITY
 and split lock detection bit

On Thu, Apr 25, 2019 at 07:45:11AM +0200, Ingo Molnar wrote:
> 
> * Fenghua Yu <fenghua.yu@...el.com> wrote:
> 
> > A new MSR_IA32_CORE_CAPABILITY (0xcf) is defined. Each bit in the MSR
> > enumerates a model specific feature. Currently bit 5 enumerates split
> > lock detection. When bit 5 is 1, split lock detection is supported.
> > When the bit is 0, split lock detection is not supported.
> > 
> > Please check the latest Intel 64 and IA-32 Architectures Software
> > Developer's Manual for more detailed information on the MSR and the
> > split lock detection bit.
> > 
> > Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> > ---
> >  arch/x86/include/asm/msr-index.h | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> > index ca5bc0eacb95..f65ef6f783d2 100644
> > --- a/arch/x86/include/asm/msr-index.h
> > +++ b/arch/x86/include/asm/msr-index.h
> > @@ -59,6 +59,9 @@
> >  #define MSR_PLATFORM_INFO_CPUID_FAULT_BIT	31
> >  #define MSR_PLATFORM_INFO_CPUID_FAULT		BIT_ULL(MSR_PLATFORM_INFO_CPUID_FAULT_BIT)
> >  
> > +#define MSR_IA32_CORE_CAPABILITY	0x000000cf
> > +#define CORE_CAP_SPLIT_LOCK_DETECT	BIT(5)     /* Detect split lock */
> 
> Please don't put comments into definitions.

I'll remove the comment and change definitions of the MSR and the split lock
detection bit as following:

+#define MSR_IA32_CORE_CAPABILITY                       0x000000cf
+#define MSR_IA32_CORE_CAPABILITY_SPLIT_LOCK_DETECT_BIT 5
+#define MSR_IA32_CORE_CAPABILITY_SPLIT_LOCK_DETECT     BIT(MSR_IA32_CORE_CAPABILITY_SPLIT_LOCK_DETECT_BIT)

Are these right changes?

Thanks.

-Fenghua