linux-kernel - Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

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Date:	Fri, 20 Jul 2012 10:10:02 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Borislav Petkov <borislav.petkov@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

> +					unsigned int *msr_ext_cpuid_mask)
> +{
> +	unsigned int msr, msr_ext;
> +
> +	msr = msr_ext = 0;
> +
> +	switch (c->x86_model) {

You have to check the family too.

> +
> +	return msr;
> +}
> +
> +static void __cpuinit intel_mask_cpu_caps(struct cpuinfo_x86 *c)
> +{
> +	u32 low, high;
> +	unsigned int msr_cpuid_mask, msr_ext_cpuid_mask;
> +
> +	msr_cpuid_mask = intel_cpuid_mask_msr(c, &msr_ext_cpuid_mask);
> +	if (msr_cpuid_mask) {
> +		set_cpu_cap(c, X86_FEATURE_CPUIDMASK);
> +
> +		rdmsr(msr_cpuid_mask, low, high);

And please use rdmsrl(), rdmsr() is so 90ies

Other than that patch looks good. I presume it will be useful for
other things than just migration too.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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