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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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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