[libvirt] libxl: expose and control xen device model versions
Hi,
These patches expose multiple xen device model options in the
capabilities XML and allow the user to select a specific device
model via the domain XML's <emulator> tag.
It is important to control the device model per VM, since the
default is changing from xen-4.2 "qemu traditional" to xen-4.3
"qemu upstream".
In this proposal, the capabilities XML now has multiple <domain>
elements per <arch> as follows:
<arch name='i686'>
<wordsize>32</wordsize>
<machine>xenfv</machine>
<domain type='xen'>
<emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
<loader>/usr/lib/xen/boot/hvmloader</loader>
</domain>
<domain type='xen'>
<emulator>/usr/lib64/xen/bin/qemu-system-i386</emulator>
<loader>/usr/lib/xen/boot/hvmloader</loader>
</domain>
</arch>
-- is it valid/ sensible to have multiple <domain>'s with the same
'type'? Let me know if you can think of a better mapping.
Comments, criticism welcome.
Cheers,
Dave