linux-kernel - Re: [v4.6-rc1 Regression] x86/topology: Create logical package id

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Message-ID: <572D03BA.7020306@canonical.com>
Date:	Fri, 6 May 2016 16:51:06 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Andi Kleen <andi.kleen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Harish Chegondi <harish.chegondi@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Jiri Olsa <jolsa@...hat.com>, Kan Liang <kan.liang@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Stephane Eranian <eranian@...gle.com>,
	Toshi Kani <toshi.kani@...com>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	LKML <linux-kernel@...r.kernel.org>, yingying.zhao@...el.com,
	"Zhang, Xiong Y" <xiong.y.zhang@...el.com>,
	1573231@...s.launchpad.net, 1397880@...s.launchpad.net,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Chen Yucong <slaoub@...il.com>,
	Laura Abbott <labbott@...oraproject.org>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [v4.6-rc1 Regression] x86/topology: Create logical package id

On 05/06/2016 04:46 PM, Boris Ostrovsky wrote:
> On 05/06/2016 03:38 PM, Joseph Salisbury wrote:
>> On 05/06/2016 03:13 PM, Boris Ostrovsky wrote:
>>> On 05/06/2016 02:48 PM, Thomas Gleixner wrote:
>>>> Yuck. That dies with a divide error. And that looks like XEN is supplying crap
>>>> data in the CPUID.
>>> Joe, do you have
>>>
>>> ed6069b xen/apic: Provide Xen-specific version of cpu_present_to_apicid
>>> APIC op
>>>
>>> -boris
>> Yes the commit is in the 4.4 based Ubuntu kernel.  This bug also happens
>> with the vanilla 4.6-rc5 kernel, which also has that commit.
>
> Can you post guest's cpuid -1 -r ? (I guess after you verify Thomas' patch)
>
> Thanks.
> -boris
>
>
>
Thomas' patch does resolve the bug.  The cpuid info can be seen here:
https://launchpadlibrarian.net/258234267/cpuid_full.txt

Thanks,

Joe