Re: [libvirt] Libvirt error in Openstack Tempest attaching disk on arm64 system
On Wed, Jul 22, 2015 at 02:53:31PM -0500, Clark Laughlin wrote:
I am running Openstack Tempest on an arm64 platform and am seeing
some
test failures related to attaching volumes to an instance. This is an
example of the disk XML generated by one of the tests:
<disk type="block" device="disk"><driver
name="qemu" type="raw"
cache="none"/<source
dev="/dev/disk/by-path/ip-10.7.1.2:3260-iscsi-iqn.2010-10.org.openstack:volume-5a204339-80cb-4d06-aecf-2a8a2c970b0e-lun-1"/><target
bus="virtio"
dev="vdb"/><serial>5a204339-80cb-4d06-aecf-2a8a2c970b0e</serial></disk>
The test is failing with the error "XML error: No PCI buses
available". I am trying to find the relevent source locations for
this functionality in either in the nova libvirt driver or in the
libvirt source itself. I am not sure why I am getting an error about
no PCI buses when the bus specified in the XML is "virtio".
I would appreciate any pointers / help.
virtio is just a guest/host device communication protocol that
can be run over multiple different transport. On x86 virtio has
always used PCI, but on s390 it uses either s390 or ccw bus,
and on arm7/aarch64 it uses mmio. I'm not sure that the mmio
bus supports hotplug, which could be why you see the error in
question. Very latest upstream QEMU does now support PCI with
aarch64 so in the near future it should have parity of functionality
with x86
Regards,
Daniel
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