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 802856 - Missing support for persistent hotplug attach/detach of <hostdev> devices
Summary: Missing support for persistent hotplug attach/detach of <hostdev> devices
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt
Version: 6.2
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Laine Stump
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-03-13 16:17 UTC by Laine Stump
Modified: 2012-06-20 06:50 UTC (History)
9 users (show)

Fixed In Version: libvirt-0.9.10-6.el6
Doc Type: Bug Fix
Doc Text:
In previous versions of RHEL, a <hostdev> device could be hotplugged to a guest, but making that device persistent across restarts of the guest required separately editing the guest configuration. The patch that closes this bug adds support for persistent hotplug of <hostdev> devices, both to the libvirt API and to the virsh commandline utility.
Clone Of:
Environment:
Last Closed: 2012-06-20 06:50:17 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2012:0748 0 normal SHIPPED_LIVE Low: libvirt security, bug fix, and enhancement update 2012-06-19 19:31:38 UTC

Description Laine Stump 2012-03-13 16:17:24 UTC 
Fixed in this upstream commit:

commit edb6fc3a7f0de4a4881862287b412b66b8153768
Author: Laine Stump <laine>
Date:   Wed Mar 7 16:05:34 2012 -0500

    qemu: support persistent hotplug of <hostdev> devices
    
    For some reason, although live hotplug of <hostdev> devices is
    supported, persistent hotplug is not. This patch adds the proper
    VIR_DOMAIN_DEVICE_HOSTDEV cases to the switches in
    qemuDomainAttachDeviceConfig and qemuDomainDetachDeviceConfig.
Comment 1 Laine Stump 2012-03-16 14:23:16 UTC 
A backported fix has been posted to rhvirt-patches for inclusion in the RHEL build of libvirt:

http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-March/msg01461.html
Comment 4 hongming 2012-03-20 05:37:41 UTC 
Use libvirt-0.9.10-2.el6.x86_64 to reproduce the bug.

#virsh attach-device rhel6 hostdev.xml --persistent
error: Failed to attach device from hostdev.xml
error: unsupported configuration:persistent attach of device is not supported.


Verify steps

1.enable kernel iommu. edit grub.conf
add intel_iommu=on at the end of kernel line.

2.For platform just support vt-d1(host kernel) and host kernel
larger than 171 kernel, do the following steps.
modprobe -r kvm_intel
modprobe -r kvm
modprobe kvm allow_unsafe_assigned_interrupts=1
modprobe kvm_intel


3.# rpm -q libvirt
libvirt-0.9.10-6.el6.x86_64


4.Check device list, prepare hotplug network from host to guest.
computer |
+- pci_0000_00_19_0 
| |
| +- net_eth0_44_37_e6_67_11_a2


4.# virsh nodedev-dumpxml pci_0000_00_19_0

5. Prepare hostdev.xml that like as following
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x00' slot='0x19' function='0x0'/>
</source>
</hostdev>


5.# virsh attach-device rhel6 hostdev.xml --persistent
Device attached successfully

6. In guest, using lspci, and ping to check the host network device is working
fine.

7. # virsh destroy rhel6

8. # virsh start rhel6

9. The host network device still works fine in guest.

10. # virsh detach-device rhel6 hostdev.xml --persistent
Device detached successfully

The host network device automatically be re-attached to host. 

11. # virsh destroy rhel6

12. # virsh start rhel6

Results
The host network device don't exist in guest. 

So it is verified.
Comment 5 Laine Stump 2012-05-08 18:15:09 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
In previous versions of RHEL, a <hostdev> device could be hotplugged to a guest, but making that device persistent across restarts of the guest required separately editing the guest configuration. The patch that closes this bug adds support for persistent hotplug of <hostdev> devices, both to the libvirt API and to the virsh commandline utility.
Comment 7 errata-xmlrpc 2012-06-20 06:50:17 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.

http://rhn.redhat.com/errata/RHSA-2012-0748.html
Note You need to log in before you can comment on or make changes to this bug.