On a Tuesday in 2022, Jonathon Jongsma wrote:
While commit a5e659f0 removed the restriction against multiple queues
for the vdpa net device, there were some missing pieces. Configuring a
device statically and then starting the domain worked as expected, but
hotplugging a device didn't have the expected multiqueue support
enabled. Add the missing bits.
Consider the following device xml:
<interface type="vdpa">
<mac address="00:11:22:33:44:03" />
<source dev="/dev/vhost-vdpa-0" />
<model type="virtio" />
<driver queues='2' />
</interface>
Without this patch, hotplugging the above XML description resulted in
the following:
{"execute":"netdev_add","arguments":{"type":"vhost-vdpa","vhostdev":"/dev/fdset/0","id":"hostnet1"},"id":"libvirt-392"}
{"execute":"device_add","arguments":{"driver":"virtio-net-pci","netdev":"hostnet1","id":"net1","mac":"00:11:22:33:44:03","bus":"pci.5","addr":"0x0"},"id":"libvirt-393"}
With the patch, hotplugging results in the following:
{"execute":"netdev_add","arguments":{"type":"vhost-vdpa","vhostdev":"/dev/fdset/0","queues":2,"id":"hostnet1"},"id":"libvirt-392"}
{"execute":"device_add","arguments":{"driver":"virtio-net-pci","mq":true,"vectors":6,"netdev":"hostnet1","id":"net1","mac":"00:11:22:33:44:03","bus":"pci.5","addr":"0x0"},"id":"libvirt-393"}
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2024406
Signed-off-by: Jonathon Jongsma <jjongsma@xxxxxxxxxx>
---
src/qemu/qemu_command.c | 4 ++++
src/qemu/qemu_hotplug.c | 3 +++
tests/qemuxml2argvdata/net-vdpa-multiqueue.x86_64-latest.args | 2 +-
3 files changed, 8 insertions(+), 1 deletion(-)
Reviewed-by: Ján Tomko <jtomko@xxxxxxxxxx> Jano
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