Bug 1416250

Summary:	User-vhost feature in qemu needed
Product:	Red Hat Enterprise Linux 7	Reporter:	Kiran <kirankn>
Component:	qemu-kvm	Assignee:	Amnon Ilan <ailan>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	urgent	Docs Contact:
Priority:	unspecified
Version:	7.5-Alt	CC:	aranjan, chayang, hhuang, juzhang, kirankn, knoel, michen, mtessun, npchandran, pezhang, qzhang, rbalakri, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-02-07 13:39:28 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Kiran 2017-01-25 04:24:19 UTC

Description of problem:

For contrail DPDK vrouter, we are using user-vhost feature of qemu which is available from qemu 2.2. But the upstream qemu in RH is of a lesser version (qemu 1.5). We need a newer qemu or backport of this feature.

Comment 1 Kiran 2017-01-25 04:33:11 UTC

Once we have the required user-vhost functionality, we need the following patch to reconnect vrouter to the VMs -
https://github.com/Juniper/contrail-dpdk-extra-packages/tree/mitaka/patches/trusty/qemu

Comment 3 Karen Noel 2017-01-25 12:56:33 UTC

(In reply to Kiran from comment #0)
> Description of problem:
> 
> For contrail DPDK vrouter, we are using user-vhost feature of qemu which is
> available from qemu 2.2. But the upstream qemu in RH is of a lesser version
> (qemu 1.5). We need a newer qemu or backport of this feature.

vhost-user is available with the version of QEMU shipping with RH OpenStack Platform. 

For RHEL 7.3, we ship qemu-kvm-rhev-2.6.0, which also contains backports from 2.7. If you give us the upstream QEMU commit ID of the patch you are intesrested in, we can see if it's included in qemu-kvm-rhev-2.6.0. We likely have this patch, since Red Hat engineers were fixing vhost-user issues upstream. 

Is there some reason you need vhost-user in qemu-kvm that is shipped with RHEL? Red Hat does not support DPDK on RHEL/KVM virtual machines. It is technology typically used with OpenStack. Thanks.

Comment 4 Kiran 2017-02-06 17:33:05 UTC

qemu-kvm-rhev-2.6.0 has the required qemu version which we wanted (i.e qemu 2.6). The bug can be closed.