linux-kernel - Re: [PATCH 2/3] x86/cpu: Describe hybrid CPUs in cpuinfo

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Date:   Fri, 2 Oct 2020 22:34:52 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     x86@...nel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Len Brown <len.brown@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH 2/3] x86/cpu: Describe hybrid CPUs in cpuinfo_x86

On Fri, Oct 02, 2020 at 01:19:30PM -0700, Ricardo Neri wrote:
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 35ad8480c464..0778b3ad26b3 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -932,6 +932,11 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
>  		c->x86_capability[CPUID_D_1_EAX] = eax;
>  	}
>  
> +	if (cpu_has(c, X86_FEATURE_HYBRID_CPU)) {
> +		cpuid_count(0x0000001a, 0, &eax, &ebx, &ecx, &edx);
> +		c->x86_cpu_type = eax;

		c->x86_cpu_type = cpuid_eax(0x0000001a);

should do too.

But send this patch together with the code that uses it.

Thx.

-- 
Regards/Gruss,
    Boris.

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