Bug 435063

Summary: Xenner fails to identify TAP device because libvirt does not configure MAC address
Product: [Fedora] Fedora Reporter: Daniel Berrange <berrange>
Component: libvirtAssignee: Daniel Veillard <veillard>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: rawhideCC: berrange
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Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2008-03-13 17:38:32 EDT Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 435059    

Description Daniel Berrange 2008-02-26 23:10:33 EST
Description of problem:
Xenner needs to know the name of the TAP devices used for guest networking. When
the libvirt QEMU driver invokes Xenner it merely passes a file descriptor.
Xenner turns this into a interface name by querying each network interface in
turn looking for  one with matching mac address.

libvirt though does not set the MAC address on the tap device it creates, so
Xenner never finds the matching device. The QEMU driver can simply set the MAC
address on the TAP device before invoking Xenner.

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Comment 1 Daniel Berrange 2008-02-27 17:19:16 EST
Patch posted upstream:

Comment 2 Daniel Berrange 2008-03-13 17:38:32 EDT
Fixed in rawhide in combination of


Now pass explicit tap device name using ifname=  param