Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.
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 879434

Summary: either disable hot-unplug usb-ehci controller and give a prompt if not support or fix it to work
Product: Red Hat Enterprise Linux 7 Reporter: Sibiao Luo <sluo>
Component: qemu-kvmAssignee: Gerd Hoffmann <kraxel>
Status: CLOSED CURRENTRELEASE QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.0CC: acathrow, areis, bsarathy, chayang, hhuang, juzhang, knoel, mazhang, michen, mkenneth, qzhang, sluo, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 879096 Environment:
Last Closed: 2014-06-13 11:50:55 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:
Bug Depends On: 879096    
Bug Blocks:    

Comment 1 Gerd Hoffmann 2013-03-20 14:52:15 UTC
RHEL-7 qemu should do tghis correctly, patch is upstream.

Comment 2 Sibiao Luo 2013-07-08 06:46:36 UTC
verify this issue on qemu-kvm-1.5.1-2.el7.x86_64, the QEMU did not core dump and will prompt that the device 'usb-ehci'|'nec-usb-xhci' does not support hotplugging. 
But for there is still prompt that 'An undefined error has occurred', please refer to existing bug 949211. 
host info:
3.10.0-0.rc7.64.el7.x86_64
qemu-kvm-1.5.1-2.el7.x86_64
guest info:
3.10.0-0.rc7.64.el7.x86_64

# /usr/libexec/qemu-kvm -M pc-i440fx-rhel7.0.0 ....-device nec-usb-xhci,id=xhci,bus=pci.0,addr=0x8 -device usb-ehci,id=ehci,bus=pci.0,addr=0x9
(qemu) device_del ehci
Device 'usb-ehci' does not support hotplugging
An undefined error has occurred
(qemu) device_del xhci
Device 'nec-usb-xhci' does not support hotplugging
An undefined error has occurred

Base on above, this issue has been fixed, set to verified status. please correct me if any mistake.

Best Regards,
sluo

Comment 3 Ludek Smid 2014-06-13 11:50:55 UTC
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.