** Changed in: qemu
Status: New => In Progress
** Patch added: "debian patch for qemu 1:2.2+dfsg"
https://bugs.launchpad.net/qemu/+bug/1546445/+attachment/4575585/+files/1%3A2.2+dfsg-5expubuntu9.8-lp1546445.patch
** Tags added: patch
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https://bugs.launchpad.net/bugs/1546445
Title:
support vhost user without specifying vhostforce
Status in QEMU:
In Progress
Bug description:
[Impact]
* vhost-user falls back to virtio-net which causes performance lose
without specifying the vhostforce option. But it should be the default
behavior for vhost-user, since guests using PMD doesn't support msi-x.
[Test Case]
create a vhost-user virtio backend without specifying the vhostforce
option, i.e. -netdev
type=vhost-user,id=mynet1,chardev=<char_dev_for_the_controll_channel>
start the VM
vhost-user is not enabled
[Regression Potential]
* none
vhost user nic doesn't support non msi guests(like pxe stage) by default.
Vhost user nic can't fall back to qemu like normal vhost net nic does. So we
should
enable it for non msi guests.
The problem has been fix in qemu upstream -
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=24f938a682d934b133863eb421aac33592f7a09e.
And the patch needs to be backported to 1:2.2+dfsg-5expubuntu9.8 .
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