linux-kernel - Re: [PATCH v4 2/2] x86/amd: Fixup cpu_core_id for family17h downcore configuration

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Message-ID: <20170725080753.GC21822@nazgul.tnic>
Date:   Tue, 25 Jul 2017 10:07:53 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, peterz@...radead.org,
        Yazen.Ghannam@....com, Andreas Herrmann <aherrmann@...e.com>
Subject: Re: [PATCH v4 2/2] x86/amd: Fixup cpu_core_id for family17h downcore
 configuration

On Tue, Jul 25, 2017 at 01:02:49PM +0700, Suravee Suthikulpanit wrote:
> Actually, this commit change how we derive the cpu_core_id fro family17h to
> use CPUID_Fn8000001E_EBX instead of from APIC ID for family17h and later.

Is the CPUID info correct also for downcored, MCM configurations? If so,
I guess you could exit early from amd_get_topology() on F17h...

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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