Public bug reported:
Binding 2nd VM to same OVS vhost-user port caused 1st vm traffic broken.
If it illegal to share same vhost port, how about the first VM open the
path exclusively?
#OVS side to create the vhost-user port:
ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev
ovs-vsctl add-port br0 phy0 -- set Interface phy0 type=dpdk
options:dpdk-devargs=0000:0a:00.0
ovs-vsctl add-port br0 dpdkvhostuser0 -- set Interface dpdkvhostuser0
type=dpdkvhostuser
#QEMU VM1
qemu-system-x86_64 -name vm1 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu1.qcow2 -numa node,memdev=mem -mem-prealloc -smp
sockets=1,cores=2 -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on -chardev
socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0 -netdev
type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
#VM2
qemu-system-x86_64 -name vm2 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu2.qcow2 -numa node,memdev=mem -mem-prealloc -smp
sockets=1,cores=2 -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on -chardev
socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0 -netdev
type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
** Affects: qemu
Importance: Undecided
Status: New
** Description changed:
Binding 2nd VM to same OVS vhost-user port caused 1st vm traffic broken.
If it illegal to share same vhost port, how about the first VM open the
path exclusively?
-
#OVS side to create the vhost-user port:
ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev
ovs-vsctl add-port br0 phy0 -- set Interface phy0 type=dpdk
options:dpdk-devargs=0000:0a:00.0
ovs-vsctl add-port br0 dpdkvhostuser0 -- set Interface dpdkvhostuser0
type=dpdkvhostuser
#QEMU VM1
- qemu-system-x86_64 -name vm1 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu1.qcow2 \
- -numa node,memdev=mem -mem-prealloc -smp sockets=1,cores=2 \
- -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on \
- -chardev socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0
\ -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \
- -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
+ qemu-system-x86_64 -name vm1 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu1.qcow2 -numa node,memdev=mem -mem-prealloc -smp
sockets=1,cores=2 -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on -chardev
socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0 -netdev
type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
#VM2
- qemu-system-x86_64 -name vm2 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu2.qcow2 \
- -numa node,memdev=mem -mem-prealloc -smp sockets=1,cores=2 \
- -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on \
- -chardev socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0
\ -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \
- -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
+ qemu-system-x86_64 -name vm2 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu2.qcow2 -numa node,memdev=mem -mem-prealloc -smp
sockets=1,cores=2 -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on -chardev
socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0 -netdev
type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
--
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https://bugs.launchpad.net/bugs/1687599
Title:
Bind 2nd VM to same OVS vhost-user port caused 1st vm traffic broken
Status in QEMU:
New
Bug description:
Binding 2nd VM to same OVS vhost-user port caused 1st vm traffic
broken. If it illegal to share same vhost port, how about the first VM
open the path exclusively?
#OVS side to create the vhost-user port:
ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev
ovs-vsctl add-port br0 phy0 -- set Interface phy0 type=dpdk
options:dpdk-devargs=0000:0a:00.0
ovs-vsctl add-port br0 dpdkvhostuser0 -- set Interface dpdkvhostuser0
type=dpdkvhostuser
#QEMU VM1
qemu-system-x86_64 -name vm1 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu1.qcow2 -numa node,memdev=mem -mem-prealloc -smp
sockets=1,cores=2 -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on -chardev
socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0 -netdev
type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
#VM2
qemu-system-x86_64 -name vm2 -cpu host -enable-kvm -m 3072 -drive
file=/opt/ubuntu2.qcow2 -numa node,memdev=mem -mem-prealloc -smp
sockets=1,cores=2 -object
memory-backend-file,id=mem,size=3072m,mem-path=/dev/hugepages,share=on -chardev
socket,id=char0,path=/usr/local/var/run/openvswitch/dpdkvhostuser0 -netdev
type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off
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