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+support vhost user without specifying vhostforce
+
+[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 .
+
+
+
+The attachment "debian patch for qemu 1:2.2+dfsg" seems to be a debdiff.  The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff.  If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.
+
+[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]
+
+Hello Liang, or anyone else affected,
+
+Accepted qemu into kilo-proposed. The package will build now and be available in the Ubuntu Cloud Archive in a few hours, and then in the -proposed repository.
+
+Please help us by testing this new package. To enable the -proposed repository:
+
+  sudo add-apt-repository cloud-archive:kilo-proposed
+  sudo apt-get update
+
+Your feedback will aid us getting this update out to other Ubuntu users.
+
+If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-kilo-needed to verification-kilo-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-kilo-failed. In either case, details of your testing will help us make a better decision.
+
+Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!
+
+Tested with 1:2.2+dfsg-5expubuntu9.7~cloud2, and the fix works for me.
+
+FYI, following additional regression tests, today we promoted qemu 2.2+dfsg-5expubuntu9.7~cloud2 from kilo-proposed to kilo-updates in the Ubuntu Cloud Archive.
+
+