[Libguestfs] [PATCH] v2v: Set machine type explicitly for outputs which support it (RHBZ#1581428).
Richard W.M. Jones
rjones at redhat.com
Tue Jun 19 11:54:57 UTC 2018
On Tue, Jun 19, 2018 at 12:39:06PM +0100, Daniel P. Berrangé wrote:
> On Tue, Jun 19, 2018 at 12:12:30PM +0100, Richard W.M. Jones wrote:
> > On Tue, Jun 19, 2018 at 11:43:38AM +0100, Daniel P. Berrangé wrote:
> > > I'd encourage apps to check the capabilities XML to see what
> > > machine types are available.
> >
> > One issue is we don't always have access to the target hypervisor.
> >
> > For example in the Glance case we have to write something which will
> > be picked up by Nova much later:
> >
> > > > + "hw_machine_type",
> > > > + (match guestcaps.gcaps_machine with
> > > > + | I440FX -> "pc"
> > > > + | Q35 -> "q35"
> > > > + | Virt -> "virt");
> >
> > I read the Nova code and it seems very ad-hoc. As far as I can tell
> > these strings are eventually passed down to libvirt. However libvirt
> > capabilities doesn't advertise these machine types exactly, but
> > something more like "pc-q35-2.6". Does libvirt map "q35" to something
> > intelligent?
>
> It'll report both - one as an alias of the other
>
> eg
>
> <machine canonical='pc-i440fx-2.11' maxCpus='255'>pc</machine>
> <machine canonical='pc-q35-2.11' maxCpus='288'>q35</machine>
Oh I see, I missed that in all the output.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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