CPU microcode update under xen

CPU microcode update under xen

[Stephan Seitz]

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Hi!

System: Debian/testing with selfcompiled kernel 3.5.5 (same error with 
3.4 or 3.6)
XEN: 4.1.3

After booting the Dom0 I notice the following errors:
[    2.939078] microcode: CPU0 sig=0x1067a, pf=0x1, revision=0xa07
[    2.991998] microcode: CPU0 update to revision 0xa0b failed
[    2.992035] microcode: CPU1 sig=0x1067a, pf=0x1, revision=0xa07
[    2.995882] microcode: CPU1 update to revision 0xa0b failed
[    2.995942] microcode: Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba

If I boot the same kernel without the hypervisor the microcode update is 
successful.

stse@osgiliath:~$ zcat /proc/config.gz |grep MICROCODE
CONFIG_MICROCODE=m
CONFIG_MICROCODE_INTEL=y
# CONFIG_MICROCODE_AMD is not set
CONFIG_MICROCODE_OLD_INTERFACE=y

 From /proc/cpuinfo:
Intel(R) Core(TM)2 Duo CPU     E8500  @ 3.16GHz

Do I need another driver for microcode updates under XEN, or is it 
impossible for now?

	Stephan

-- 
| Stephan Seitz          E-Mail: stse@fsing.rootsland.net |
| Public Keys: http://fsing.rootsland.net/~stse/keys.html |

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Re: CPU microcode update under xen

[Ben Guthro]

This is not yet merged.

You'll need to look at the following branch from Konrad:
http://git.kernel.org/?p=linux/kernel/git/konrad/xen.git;a=shortlog;h=refs/heads/stable/misc

primarily, the following changesets:
23757fb5d6781bf945d21d1f5373aa71122cbea9
f6c958ff0d00ffbf1cdc8fcf2f2a82f06fbbb5f4



On Tue, Oct 16, 2012 at 1:27 PM, Stephan Seitz
<stse+xen@fsing.rootsland.net> wrote:
>
> Hi!
>
> System: Debian/testing with selfcompiled kernel 3.5.5 (same error with 3.4 or 3.6)
> XEN: 4.1.3
>
> After booting the Dom0 I notice the following errors:
> [    2.939078] microcode: CPU0 sig=0x1067a, pf=0x1, revision=0xa07
> [    2.991998] microcode: CPU0 update to revision 0xa0b failed
> [    2.992035] microcode: CPU1 sig=0x1067a, pf=0x1, revision=0xa07
> [    2.995882] microcode: CPU1 update to revision 0xa0b failed
> [    2.995942] microcode: Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba
>
> If I boot the same kernel without the hypervisor the microcode update is successful.
>
> stse@osgiliath:~$ zcat /proc/config.gz |grep MICROCODE
> CONFIG_MICROCODE=m
> CONFIG_MICROCODE_INTEL=y
> # CONFIG_MICROCODE_AMD is not set
> CONFIG_MICROCODE_OLD_INTERFACE=y
>
> From /proc/cpuinfo:
> Intel(R) Core(TM)2 Duo CPU     E8500  @ 3.16GHz
>
> Do I need another driver for microcode updates under XEN, or is it impossible for now?
>
>         Stephan
>
> --
> | Stephan Seitz          E-Mail: stse@fsing.rootsland.net |
> | Public Keys: http://fsing.rootsland.net/~stse/keys.html |
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
>

Re: CPU microcode update under xen

[Ian Campbell]

On Tue, 2012-10-16 at 18:54 +0100, Ben Guthro wrote:
> This is not yet merged.

Please try and avoid top posting...

> On Tue, Oct 16, 2012 at 1:27 PM, Stephan Seitz
> <stse+xen@fsing.rootsland.net> wrote:
[...]
> > Do I need another driver for microcode updates under XEN, or is it impossible for now?

There is also the option for Xen itself to load the microcode.

See the ucode option in
http://xenbits.xen.org/docs/4.2-testing/misc/xen-command-line.html

I think this is probably 4.2+ only though (not sure when it was added).

Ian.

Re: CPU microcode update under xen

[Jan Beulich]

>>> On 16.10.12 at 20:42, Ian Campbell <Ian.Campbell@citrix.com> wrote:
>> On Tue, Oct 16, 2012 at 1:27 PM, Stephan Seitz
>> <stse+xen@fsing.rootsland.net> wrote:
> [...]
>> > Do I need another driver for microcode updates under XEN, or is it 
> impossible for now?
> 
> There is also the option for Xen itself to load the microcode.
> 
> See the ucode option in
> http://xenbits.xen.org/docs/4.2-testing/misc/xen-command-line.html 
> 
> I think this is probably 4.2+ only though (not sure when it was added).

Yes, this is 4.2+ only.

Jan

Re: CPU microcode update under xen

[Stephan Seitz]

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On Tue, Oct 16, 2012 at 01:54:59PM -0400, Ben Guthro wrote:
>This is not yet merged.
>
>You'll need to look at the following branch from Konrad:
>http://git.kernel.org/?p=linux/kernel/git/konrad/xen.git;a=shortlog;h=refs/heads/stable/misc

Thanks for your answer.

>primarily, the following changesets:
>23757fb5d6781bf945d21d1f5373aa71122cbea9
>f6c958ff0d00ffbf1cdc8fcf2f2a82f06fbbb5f4

Those patches are about one year old. Any reasons why they are not merged 
yet?

	Stephan

-- 
| Stephan Seitz          E-Mail: stse@fsing.rootsland.net |
| Public Keys: http://fsing.rootsland.net/~stse/keys.html |

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Re: CPU microcode update under xen

[Konrad Rzeszutek Wilk]

On Wed, Oct 17, 2012 at 10:06:59PM +0200, Stephan Seitz wrote:
> On Tue, Oct 16, 2012 at 01:54:59PM -0400, Ben Guthro wrote:
> >This is not yet merged.
> >
> >You'll need to look at the following branch from Konrad:
> >http://git.kernel.org/?p=linux/kernel/git/konrad/xen.git;a=shortlog;h=refs/heads/stable/misc
> 
> Thanks for your answer.
> 
> >primarily, the following changesets:
> >23757fb5d6781bf945d21d1f5373aa71122cbea9
> >f6c958ff0d00ffbf1cdc8fcf2f2a82f06fbbb5f4
> 
> Those patches are about one year old. Any reasons why they are not
> merged yet?

Sure. If you Google for the titles of those patches you will see
Borislav being unhappy about them.