RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1128751 - <driver/> isn't always formated as it should be
Summary: <driver/> isn't always formated as it should be
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.0
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Michal Privoznik
QA Contact: Michael Burman
URL:
Whiteboard: network
: 1176148 (view as bug list)
Depends On:
Blocks: rhev35rcblocker rhev35gablocker 1183447
TreeView+ depends on / blocked
 
Reported: 2014-08-11 13:16 UTC by Michael Burman
Modified: 2023-09-14 02:45 UTC (History)
13 users (show)

Fixed In Version: libvirt-1.2.8-1.el7
Doc Type: Bug Fix
Doc Text:
Due to a bug in the underlying code, each attribute of the [driver/] element of the libvirt [interface/] setting was incorrectly formatted with its own [driver/] element. As a consequence, only the first [driver/] element and its attribute were parsed back, and the following [driver/] elements and their attributes were ignored. This could lead to a number of features not working correctly. With this update, the [driver/] is formatted only once with all the attributes, and is therefore parsed as intended. As a result, the described problem no longer occurs.
Clone Of:
: 1183447 (view as bug list)
Environment:
Last Closed: 2015-03-05 07:42:14 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
vdsm.log (10.35 MB, text/x-log)
2014-08-11 13:16 UTC, Michael Burman 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0323 0 normal SHIPPED_LIVE Low: libvirt security, bug fix, and enhancement update 2015-03-05 12:10:54 UTC

Description Michael Burman 2014-08-11 13:16:04 UTC 
Created attachment 925745 [details]
vdsm.log

Description of problem:
<driver queues='X'/> is accepted but not formatted back
Vdsm reports XML to libvirt, but just doesn't format it back in the XML
ps -ww `pgrep qemu-kvm`   -  fds=25:26:27:28:29:30:31 (7 queues)
Libvirt requires driver name or txmode

Version-Release number of selected component (if applicable):
libvirt-1.1.1-29.el7_0.1.x86_64

How reproducible:


Steps to Reproduce:
1. Config value for queue on vNIC profile  
2. Check vdsm reports XML to libvirt 
3. Run ps -ww `pgrep qemu-kvm`

Actual results:
<driver queues='X'/> is accepted but not formatted back

Expected results:
<driver queues='X'/> should be formatted back in the XML

Additional info:
https://bugzilla.redhat.com/show_bug.cgi?id=821493
Comment 1 Michal Privoznik 2014-08-11 13:27:25 UTC 
Patch proposed upstream:

https://www.redhat.com/archives/libvir-list/2014-August/msg00462.html
Comment 2 Michal Privoznik 2014-08-12 08:03:39 UTC 
I've just pushed the patch upstream:

commit 3085702b5461d3b0b057c37cf5fbff432244f529
Author:     Michal Privoznik <mprivozn>
AuthorDate: Mon Aug 11 14:51:49 2014 +0200
Commit:     Michal Privoznik <mprivozn>
CommitDate: Tue Aug 12 09:29:10 2014 +0200

    conf: Format interface's driver more frequently
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1128751
    
    There's this <driver/> element under <interface/> which can have
    several attributes. However, the driver element is currently formated
    only if the driver's name or txmode has been specified. This makes
    only a little sense as we parse even partial <driver/>, for instance:
    
        <interface type='user'>
          <mac address='52:54:00:e5:48:58'/>
          <model type='virtio'/>
          <driver ioeventfd='on' event_idx='on' queues='5'/>
        </interface>
    
    But such XML would never get formatted back.
    
    Signed-off-by: Michal Privoznik <mprivozn>
Comment 3 Michal Privoznik 2014-08-12 08:07:16 UTC 
Moving to POST:

http://post-office.corp.redhat.com/archives/rhvirt-patches/2014-August/msg00274.html
Comment 5 Michael Burman 2014-10-01 07:18:34 UTC 
Verified on - 3.5.0-0.13.beta.el6ev with libvirt-1.2.8-4.el7.x86_64
Comment 6 Michal Privoznik 2015-01-06 09:29:40 UTC 
*** Bug 1176148 has been marked as a duplicate of this bug. ***
Comment 7 Dan Kenigsberg 2015-01-06 11:13:24 UTC 
Can this be cloned to 7.0.z, as a RHEV-3.5 feature depends on it?
Comment 8 Michal Privoznik 2015-01-06 12:14:05 UTC 
(In reply to Dan Kenigsberg from comment #7)
> Can this be cloned to 7.0.z, as a RHEV-3.5 feature depends on it?

Sure it can. Although we need PM help here to clone it.
Comment 11 Song Wang 2015-01-28 06:44:25 UTC 
Verify it as follows:
Scene 1:
1.[root@localhost libvirt]# rpm -q libvirt
libvirt-1.2.8-15.el7.x86_64

2.[root@localhost libvirt]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     aa                             shut off

3.[root@localhost libvirt]# virsh dumpxml aa |grep interface -A6
    <interface type='network'>
      <mac address='52:54:00:c9:7d:a5'/>
      <source network='default'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </interface>

4.add" <driver ioeventfd='on' event_idx='on' queues='5'/>" to xml
[root@localhost libvirt]# virsh edit aa
Domain aa XML configuration edited.

5.[root@localhost libvirt]# virsh dumpxml aa |grep interface -A6
    <interface type='network'>
      <mac address='52:54:00:c9:7d:a5'/>
      <source network='default'/>
      <model type='virtio'/>
      <driver ioeventfd='on' event_idx='on' queues='5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </interface>

6.[root@localhost libvirt]# virsh start aa;virsh dumpxml aa |grep interface -A6
Domain aa started

    <interface type='network'>
      <mac address='52:54:00:c9:7d:a5'/>
      <source network='default' bridge='virbr0'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <driver ioeventfd='on' event_idx='on' queues='5'/>
      <alias name='net0'/>
--
    </interface>

[root@localhost libvirt]# ps aux |grep qemu
qemu      7267  104  0.5 1914740 46172 ?       Sl   14:34   0:07 /usr/libexec/qemu-kvm -name aa -S -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off -m 1024 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid 23d19d5a-ee01-4a2b-bec9-948fca512c00 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/aa.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device pci-bridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0x3 -device nec-usb-xhci,id=usb,bus=pci.0,addr=0x6 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive file=/var/lib/libvirt/images/rhel7.0.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=none -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fds=24:25:26:27:28,id=hostnet0,vhost=on,vhostfds=29:30:31:32:33 -device virtio-net-pci,ioeventfd=on,event_idx=on,mq=on,vectors=12,netdev=hostnet0,id=net0,mac=52:54:00:c9:7d:a5,bus=pci.0,addr=0x5 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -spice port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=8,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,bus=pci.0,addr=0x7 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x9 -msg timestamp=on
root      7288  0.0  0.0 112640   964 pts/0    S+   14:34   0:00 grep --color=auto qemu


7.[root@localhost libvirt]# virsh destroy aa
Domain aa destroyed

8.[root@localhost libvirt]# virsh dumpxml aa |grep interface -A6
    <interface type='network'>
      <mac address='52:54:00:c9:7d:a5'/>
      <source network='default'/>
      <model type='virtio'/>
      <driver ioeventfd='on' event_idx='on' queues='5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </interface>

Scene 2:
1.add      <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5'/>   to xml
[root@localhost libvirt]# virsh edit aa
Domain aa XML configuration edited.

2.[root@localhost libvirt]# virsh dumpxml aa |grep interface -A6
    <interface type='network'>
      <mac address='52:54:00:c9:7d:a5'/>
      <source network='default'/>
      <model type='virtio'/>
      <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </interface>
3. [root@localhost libvirt]# virsh start aa
Domain aa started

[root@localhost libvirt]# virsh dumpxml aa |grep interface -A6
    <interface type='network'>
      <mac address='52:54:00:c9:7d:a5'/>
      <source network='default' bridge='virbr0'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5'/>
      <alias name='net0'/>



bug is fixed.
Comment 13 errata-xmlrpc 2015-03-05 07:42:14 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0323.html
Comment 14 Red Hat Bugzilla 2023-09-14 02:45:35 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days
Note You need to log in before you can comment on or make changes to this bug.