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[Libvir] Bug with libvirt in Xen 3.0.1?



Hi, I think I may have found a bug in libvirt and wanted see what people
thought.  I'm using the stock FC5 installation at the moment (with xen 3.0.1),
and the newest version of libvirt.  I am noticing that with xen 3.0.1 and newer
versions of libvirt, getDomainsID() seems to return bogus values.  For example:

[root test05 ~]# virsh list
 Id Name                 State
----------------------------------
  0 Domain-0             running
libvir: Xen Daemon error : GET operation failed: No such domain 65486
libvir: Xen Daemon error : GET operation failed: No such domain 2986

But, if I use xm, I get what I expect:

[root test05 ~]# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0     1507     2 r-----   387.5
vm1                                1      256     1 -b----   151.3
vm2                                2      256     1 -b----    87.9

After some digging around in the code, I believe that libvirt is incorrectly
identifying the hypervisor as being "old" in xen_internal.c:xenHypervisorInit,
and is therefore passing the incorrect parameter structure into the hypervisor
when it makes its ioctl in xen_internal.c:xenHypervisorListDomains.

I've tried this same test on a system running xen 3.0.2, and as I expected
everything works fine.  So, there must be something different about xen 3.0.1
that libvirt is not accounting for.

At this point, I don't really have more time to dig further but I thought I'd
bring up the issue in case someone on this list can offer more insight.

Pete




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