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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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=refs/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

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