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qemu: fix hotplug for multiqueue vdpa net device

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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@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Jonathon Jongsma 2022-03-29 14:24:36 -05:00
parent 7767454267
commit 3832db2108
3 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/qemu/qemu_command.c
View File

@ -4346,6 +4346,10 @@ qemuBuildHostNetProps(virDomainNetDef *net,
if (virJSONValueObjectAdd(&netprops, "s:type", "vhost-vdpa", NULL) < 0 ||
virJSONValueObjectAppendString(netprops, "vhostdev", vdpadev) < 0)
return NULL;
if (net->driver.virtio.queues > 1 &&
virJSONValueObjectAppendNumberUlong(netprops, "queues", net->driver.virtio.queues) < 0)
return NULL;
break;
case VIR_DOMAIN_NET_TYPE_HOSTDEV:

3
src/qemu/qemu_hotplug.c
View File

@ -1386,6 +1386,9 @@ qemuDomainAttachNetDevice(virQEMUDriver *driver,
break;
case VIR_DOMAIN_NET_TYPE_VDPA:
queueSize = net->driver.virtio.queues;
if (!queueSize)
queueSize = 1;
if (qemuDomainAdjustMaxMemLock(vm, false) < 0)
goto cleanup;
adjustmemlock = true;

2
tests/qemuxml2argvdata/net-vdpa-multiqueue.x86_64-latest.args
View File

@ -29,7 +29,7 @@ XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
-boot strict=on \
-device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
-add-fd set=0,fd=1732,opaque=net0-vdpa \
-netdev vhost-vdpa,vhostdev=/dev/fdset/0,id=hostnet0 \
-netdev vhost-vdpa,vhostdev=/dev/fdset/0,queues=2,id=hostnet0 \
-device '{"driver":"virtio-net-pci","mq":true,"vectors":6,"netdev":"hostnet0","id":"net0","mac":"52:54:00:95:db:c0","bus":"pci.0","addr":"0x2"}' \
-audiodev '{"id":"audio1","driver":"none"}' \
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \