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Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12

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Paolo Bonzini <pbonzini@redhat.com> wrote:

> On 06/08/2017 23:23, Sebastian Rachuj wrote:
>> On 06.08.2017 23:10, Paolo Bonzini wrote:
>>> On 05/08/2017 21:26, Sebastian Rachuj wrote:
>>>> Dear linux developers,
>>>> 
>>>> since my upgrade from linux 4.11 to linux 4.12 the "kvm_intel" module
>>>> does not load correctly anymore. "Modprobing" the kernel module gives an
>>>> Input/Output error. It seems to be related to the CPU architecture and
>>>> (to my knowledge) affects Conroe CPUs. I did a bisect and found the
>>>> following commit as the guilty one:
>>> 
>>> What is your cpuinfo?  I tested on a Conroe Xeon X3220 (family 6,
>>> model 15, stepping 11) when I posted that patch, and it did have virtual
>>> NMIs.
>> 
>> Thank you for looking into the issue. My cpuinfo is as follows:
> 
> Looks like Intel was already differentiating virtualization features
> across SKUs.  Please run the attached script as root to see what other
> things are different (apparently) between non-Xeon and Xeon Conroes.

There may be another explanation. If I remember correctly from my days in
Intel, Intel initially sold CMWA (Conroe) B-step. The next step, E-step,
introduced a couple of new features, which may have included vNMI.

The CPU of Sebastian appears to be B1 according to cpuinfo.

Nadav

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Thread

kvm_intel fails to load on Conroe CPUs running Linux 4.12 "Sebastian Rachuj" <Rachus@web.de> - 2017-08-05 21:30 +0200
  Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Paolo Bonzini <pbonzini@redhat.com> - 2017-08-06 23:20 +0200
    Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Sebastian Rachuj <rachus@web.de> - 2017-08-06 23:30 +0200
      Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Paolo Bonzini <pbonzini@redhat.com> - 2017-08-07 11:50 +0200
        Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Nadav Amit <nadav.amit@gmail.com> - 2017-08-07 19:20 +0200
        Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Sebastian Rachuj <rachus@web.de> - 2017-08-07 19:20 +0200
          Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Paolo Bonzini <pbonzini@redhat.com> - 2017-08-07 20:00 +0200
            Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Sebastian Rachuj <rachus@web.de> - 2017-08-07 20:50 +0200
            Re: Re: kvm_intel fails to load on Conroe CPUs running Linux 4.12 Niall Walsh <lkml@celtux.org> - 2017-08-08 23:50 +0200

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