Re: [Xen-devel] (4.5-rc1) Problems using xl migrate

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Mon, 24 Nov 2014, Andrew Cooper wrote:

> On 24/11/14 12:41, Wei Liu wrote:
> > On Sat, Nov 22, 2014 at 07:24:21PM +0000, M A Young wrote:
> > > While investigating a bug reported on Red Hat Bugzilla
> > > https://bugzilla.redhat.com/show_bug.cgi?id=1166461
> > > I discovered the following
> > >
> > > xl migrate --debug domid localhost does indeed fail for Xen 4.4 pv (the bug
> > > report is for Xen 4.3 hvm ) when xl migrate domid localhost works. There are
> > > actually two issues here
> > >
> > > * the segfault in libxl-save-helper --restore-domain (as reported in the bug
> > > above) occurs if the guest memory is 1024M (on my 4G box) and is presumably
> > > because the allocated memory eventually runs out
> > >
> > > * the segfault doesn't occur if the guest memory is 128M, but the migration
> > > still fails. The first attached file contains the log from a run with xl -v
> > > migrate --debug domid localhost (with mfn and duplicated lines stripped out
> > > to make the size manageable).
> > >
> > > I then tried xen 4.5-rc1 to see if the bug was fixed and found that xl
> > > migrate doesn't work for me at all - see the second attached file for the
> > > output of xl -v migrate domid localhost .
> > >
> > >         Mchael Young
> > [...]
> > > xc: detail: delta 15801ms, dom0 95%, target 0%, sent 543Mb/s, dirtied 0Mb/s 314 
> > > pages
> > > xc: detail: Mapping order 0,  268; first pfn 3fcf4
> > > xc: detail: delta 23ms, dom0 100%, target 0%, sent 447Mb/s, dirtied 0Mb/s 0 
> > > pages
> > > xc: detail: Start last iteration
> > > xc: Reloading memory pages: 262213/262144  100%xc: detail: SUSPEND shinfo 
> > > 00082fbc
> > > xc: detail: delta 17ms, dom0 58%, target 58%, sent 0Mb/s, dirtied 1033Mb/s 536 
> > > pages
> > > xc: detail: delta 8ms, dom0 100%, target 0%, sent 2195Mb/s, dirtied 2195Mb/s 
> > > 536 pages
> > > xc: detail: Total pages sent= 262749 (1.00x)
> > > xc: detail: (of which 0 were fixups)
> > > xc: detail: All memory is saved
> > > xc: error: Error querying maximum number of MSRs for VCPU0 (1 = Operation not 
> > > permitted): Internal error
> > Per your description this is the output of "xl -v migrate domid
> > localhost", so no "--debug" is involved. (Just to make sure...)
> >
> > This error message means a domctl fails, which should be addressed
> > first?
> >
> > FWIW I tried "xl -v migrate domid localhost" for a PV guest it worked
> > for me. :-(
> >
> > Is there anything I need to do to trigger this failure?
> Is XSM in use?  I can't think of any other reason why that hypercall
> would fail with EPERM.
XSM is built in (I wanted to allow the option of people using it) but I 
didn't think it was active.
        Michael Young

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