From 68b294cf8e9c5e0f0f14b14e63178b2bf7a9f7e2 Mon Sep 17 00:00:00 2001 Message-Id: <68b294cf8e9c5e0f0f14b14e63178b2bf7a9f7e2@dist-git> From: Jonathon Jongsma Date: Tue, 29 Mar 2022 14:24:36 -0500 Subject: [PATCH] qemu: fix hotplug for multiqueue vdpa net device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: 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 Reviewed-by: Ján Tomko (cherry picked from commit 3832db21084661d00438dfbb4bad865816157dd9) Signed-off-by: Jonathon Jongsma --- 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(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 509bab08ef..ee0e611513 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -4349,6 +4349,10 @@ 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: diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 04c6600f26..c10493e212 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -1364,6 +1364,9 @@ 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; diff --git a/tests/qemuxml2argvdata/net-vdpa-multiqueue.x86_64-latest.args b/tests/qemuxml2argvdata/net-vdpa-multiqueue.x86_64-latest.args index 61ba85a847..3e45ab6870 100644 --- a/tests/qemuxml2argvdata/net-vdpa-multiqueue.x86_64-latest.args +++ b/tests/qemuxml2argvdata/net-vdpa-multiqueue.x86_64-latest.args @@ -29,7 +29,7 @@ XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \ -boot strict=on \ -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \ -add-fd set=0,fd=1732,opaque=/dev/vhost-vdpa-0 \ --netdev vhost-vdpa,vhostdev=/dev/fdset/0,id=hostnet0 \ +-netdev vhost-vdpa,vhostdev=/dev/fdset/0,queues=2,id=hostnet0 \ -device virtio-net-pci,mq=on,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 \ -- 2.35.1