linux-kernel - Re: [PATCH] x86/cpuid: Deal with broken firmware once more

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Message-ID: <20161110155408.wtxaxneg77xc6apa@linutronix.de>
Date:   Thu, 10 Nov 2016 16:54:10 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     "Charles (Chas) Williams" <ciwillia@...cade.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "M. Vefa Bicakci" <m.v.b@...box.com>,
        "x86@...nel.org" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        David Vrabel <david.vrabel@...rix.com>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH] x86/cpuid: Deal with broken firmware once more

On 2016-11-10 10:31:20 [-0500], Boris Ostrovsky wrote:
> For Xen, we recently added a6a198bc60e6 ("xen/x86: Update topology map
> for PV VCPUs") to at least temporarily work around some topology map
> problems that PV guests have with RAPL (which I think is what Vefa's
> problem was).

I wouldn't blame it on RAPL. It is RAPL that exposes the wrong APICID
<-> CPU <-> Package mapping.

> -boris

Sebastian