I was just recently told I should try using virtio-scsi on arm64 -- that QEMU 2.4.0 has everything needed for block device hotplug on arm64 using virtio-scsi. I see that nova appears to have support as of Feb 2014 ( https://review.openstack.org/#/c/70263/). I am currently using the distro-provided libvirt on trusty and vivid. Would this be new enough to have what I need?
Thank you, Clark On Wed, Jul 22, 2015 at 3:58 PM, Daniel P. Berrange <berra...@redhat.com> wrote: > 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 > -- > |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ > :| > |: http://libvirt.org -o- http://virt-manager.org > :| > |: http://autobuild.org -o- http://search.cpan.org/~danberr/ > :| > |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc > :| >
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