[libvirt] [PATCH v3 6/7] virsh: add function to get the CPU models for an arch

[Eric Blake]

On 09/13/2013 03:06 PM, Eric Blake wrote:
> On 09/13/2013 02:58 PM, Eric Blake wrote:
>> On 09/11/2013 08:13 AM, Giuseppe Scrivano wrote:
>>
>> I tweaked this some during my testing of NULL models; but don't think we
>> need to make virsh expose NULL models to the command line, so I'm not
>> changing this.
>>
>> ACK with this squashed in (oh, I just noticed my emacs'
>> copyright-checker kicked in for my edits; I wonder how many other files
>> you touched that could use an updated copyright):
>>
> 
> Blah.  I get this far, where things are finally testable, and see:
> 
> # tools/virsh cpu-models x86_64
> 2013-09-13 21:04:43.332+0000: 16843: error : cpuMapLoad:121 : internal
> error: cannot find CPU map for x86_64 architecture
> error: failed to get CPU model names
> error: internal error: cannot find CPU map for x86_64 architecture
> 
> I'm now debugging whether it was one of the patches I modified, or a
> flaw in your original patch.

Jiri helped me on IRC.  The list of arch names in 'virsh capabilities'
is from a canonical list; but the list of arch names in
/usr/share/libvirt/cpu_map.xml is a list of drivers (which can support
one _or more than one_ canonical architecture). More precisely:

$ grep 'arch ' /usr/share/libvirt/cpu_map.xml
  <arch name='x86'>
  <arch name='ppc64'>
$ tools/virsh -c test:///default capabilities | grep 'arch '
    <arch name='i686'>
    <arch name='i686'>

this suggests that the 'x86' driver knows how to manage both the 'i686'
and 'x86_64' architectures.  So ideally, qemu-system-x86_64 should
support 'virsh cpu-models x86_64' and 'virsh cpu-models i686' with
identical lists (after all, x86_64 chips can run in i686 mode), while
the test driver (which claims support for ONLY i686) might want to fail
for x86_64.  Furthermore, with your patches as-is, 'virsh cpu-models
x86' returned a list; but I don't think this is appropriate as that name
is not in the capabilities output.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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