[libvirt] [RFC] Expose cpu_map.xml via API

[Eric Blake]

On 08/19/2013 01:22 PM, Doug Goldstein wrote:
> On Mon, Aug 19, 2013 at 1:19 PM, Giuseppe Scrivano <gscrivan at redhat.com>wrote:
> 
>> ---
>> I have started working on:
>>
>>   https://bugzilla.redhat.com/show_bug.cgi?id=916786
>>
>> Before I split it in a series of commits, test it better and then
>> proceed to virt-manager, are you ok with this idea?
>>

> 
> I'm wondering if this could some how be done as an extension to the
> virConnectBaselineCPU APIs? It would probably have to be another API
> entirely but at least similar in naming scope.

Not just that, but we JUST took a patch that enhanced the
virConnectBaselineCPU API to take a flag argument:
https://www.redhat.com/archives/libvir-list/2013-August/msg00150.html

Looking at it further, it looks like the REAL problem to be solved is
"given an emulator, which CPU models can I pass by name, and what CPU
features will those models imply".  It is completely independent of how
the implementation stores it (that is, the fact that our qemu driver
stores a cpu_map.xml lookup table should NOT be used in determining the
function name).


> 
> Or potentially generic-ify this a bit more to make it like a
> virConnectHypervisorCapabilities() where right now it just returns back the
> CPUs the HV can emulate. In the future it can have support for other things
> if we need it to.

Listing all the capabilities of all the emulators in the existing
virConnectHypervisorCapabilities may be too much XML for one RPC call;
so a new API that lets us focus on one particular emulator is
worthwhile.  But yes, this is a better scheme to be copying from - we
want a command where the user specifies an emulator, and the output is
XML describing that emulator's capabilities according to what libvirt
can expose.

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

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