Re: [Xen-devel] [xl restore and migrating problem - hardware compatibility]

["Ing. Ricardo Brisighelli" <ricardo@xxxxxxxxxxxxx>]

El Vie 23 Dic 2016 23:22:17 Andrew Cooper escribió:
> On 23/12/16 22:56, Ing. Ricardo Brisighelli wrote:
> > El Vie 23 Dic 2016 17:16:32 Andrew Cooper escribió:
> >> On 23/12/16 17:00, Andrew Cooper wrote:
> >>> On 23/12/16 16:32, Ing. Ricardo Brisighelli wrote:
> >>>> Hi, i'm gentoo user and try with xen 4.6.3 and 4.7.1 in both version
> >>>> have the
> >>>> same problem.
> >>>> 
> >>>> My cpu is AMD A10-7860K
> >>> 
> >>> This issue has been reported before ("[Xen-devel] "X86_PV_VCPU_MSRS
> >>> record truncated" during domain restore").
> >>> 
> >>> I submitted patches to fix it ("Fix issues with zero-length records in
> >>> migration v2" in July even), which made no progress. As the author of
> >>> migration v2, and unfortunately of this bug, I stand by v1 of my fix
> >>> without any further modification.
> >>> 
> >>> You can find the patches here:
> >>> https://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a=shortlog;h
> >>> =r
> >>> efs/heads/tools-fix-zero-length-records
> >> 
> >> If you don't want to take patches, you should be able to work around the
> >> issue by booting Xen with
> >> 
> >> cpuid_mask_ext_ecx=fbffffff
> >> 
> >> Specifically, you are looking to hide the DBEXT feature from Xen so it
> >> doesn't choose to insert them into the migration stream to start with.
> >> This migration bug only manifests when the hardware is capable, but the
> >> VM isn't using the feature.
> >> 
> >> ~Andrew
> > 
> > Hi Andrew, first i try boot xen with cpuid_mask_ext_ecx=fbffffff, restore
> > and migration works well, then try apply the patchs
> > 
> > tools/python: Adjust migration v2 library to warn about...
> > tools/libxc: Avoid generating inappropriate zero-length...
> > tools/libxc: Tolerate zero-length records in migration...
> > 
> > remove cpuid_mask, recompile and install xen-4.7.1, reboot and the problem
> > persist. I'm missing something?
> 
> Does Gentoo split the various parts of Xen apart into sub-packages? This
> needs to be the dom0 tools build, not the hypervisor build.
> 
> ~Andrew
> 
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> 

I recompile xen-tools and all works well.

Thanks very much Andrew

Regards






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