Bug 1386906 - Need to add reconnect support for vhost-user in QEMU
Summary: Need to add reconnect support for vhost-user in QEMU
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm-rhev
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
high
Target Milestone: pre-dev-freeze
: ---
Assignee: Amnon Ilan
QA Contact: Pei Zhang
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-10-19 19:18 UTC by bigswitch
Modified: 2017-01-30 11:57 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-01-30 11:57:18 UTC
Target Upstream Version:

Attachments (Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

Description bigswitch 2016-10-19 19:18:55 UTC 
We observe that when a VM using vhostuser (in client mode) interface disconnects from a virtual switch (eg: when vswitch (server mode) restart), even when the vswitch reconnects with the vhost socket, the interface is still down. Searching around, we found that QEMU needs to be enhanced to support this. We would like these commits (and other dependent commits) available to our RHOSP compute nodes as well.

Ref:
http://www.dpdk.org/ml/archives/dev/2016-May/038795.html
lists.nongnu.org/archive/html/qemu-devel/2016-05/msg01507.html
Comment 1 Amnon Ilan 2016-10-25 21:31:12 UTC 
Can you try it with the latest upstream versions for QEMU and DPDK? Many 
improvements for vhost-user reconnect were introduced since May 16.

Thanks,
Amnon
Comment 2 bigswitch 2016-11-03 23:00:12 UTC 
How would the customers get a hold of these fixes in deployment? Are the bug fixes part of RHOSP9 or RHOSP10?
Comment 3 Amnon Ilan 2016-11-04 00:18:50 UTC 
These fixes are available in RHEL7.3. 
Franck, can you answer regarding RHOSP versions?

Bigswitch, since we are still working on further enhancements to 
vhost-user reconnect, it could help if you can test the upstream 
versions as well, and point to specific use cases that fail there.
Comment 4 Franck Baudin 2016-11-04 10:18:18 UTC 
RHOSP8, 9 and 10 will run on RHEL 7.3. If no patches are required (it seems to me that no patches are required but this has to be confirmed) on OpenStack to fix the issue and is 100% fixed by RHEL 7.3, the bug will be fixed.
Note You need to log in before you can comment on or make changes to this bug.