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Subject: Re: [v4.6-rc1 Regression] x86/topology: Create logical package id
To: Joseph Salisbury <joseph.salisbury@canonical.com>,
        Thomas Gleixner <tglx@linutronix.de>
References: <572CDF53.7040301@canonical.com>
 <alpine.DEB.2.11.1605062046270.3540@nanos> <572CECCD.2010205@oracle.com>
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Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Andi Kleen <andi.kleen@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@amacapital.net>,
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        Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
        Denys Vlasenko <dvlasenk@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Harish Chegondi <harish.chegondi@intel.com>,
        Jacob Pan <jacob.jun.pan@linux.intel.com>,
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        Vince Weaver <vincent.weaver@maine.edu>,
        LKML <linux-kernel@vger.kernel.org>, yingying.zhao@intel.com,
        "Zhang, Xiong Y" <xiong.y.zhang@intel.com>, 1573231@bugs.launchpad.net,
        1397880@bugs.launchpad.net, Ingo Molnar <mingo@redhat.com>,
        x86@kernel.org, Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Chen Yucong <slaoub@gmail.com>,
        Laura Abbott <labbott@fedoraproject.org>,
        David Vrabel <david.vrabel@citrix.com>
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Message-ID: <572D02AA.5050506@oracle.com>
Date: Fri, 6 May 2016 16:46:34 -0400
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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