Bug 541623

Summary:	QEMU 0.12 won't start with disconnected CD-ROM
Product:	[Fedora] Fedora	Reporter:	Matthew Booth <mbooth>
Component:	libvirt	Assignee:	Daniel Veillard <veillard>
Status:	CLOSED WORKSFORME	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	low
Version:	rawhide	CC:	berrange, clalance, crobinso, itamar, jforbes, psj, veillard, virt-maint
Target Milestone:	---	Keywords:	Triaged
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-03-16 14:48:32 UTC	Type:	---
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:
Bug Blocks:	514891

Description Matthew Booth 2009-11-26 14:36:56 UTC

Description of problem:
If a guest has a CD drive but no backing file, libvirt outputs the following on the QEMU command line:

-drive file=,if=ide,media=cdrom,index=2,format=raw

QEMU 0.11 creates a CD drive with no media. QEMU 0.12 as of 63e86b2e refuses to start, reporting:

qemu: could not open disk image : No such file or directory

Version-Release number of selected component (if applicable):
libvirt-0.7.4-1.fc12.x86_64
QEMU built from git 63e86b2e

How reproducible:
Always

Steps to Reproduce:
1. Change emulator to point to latest qemu
2. 'Disconnect' CD-ROM drive in virt-manager gui
3. Start domain
  
Actual results:
Fails with: qemu: could not open disk image : No such file or directory

Expected results:
Works as before.

Additional info:

Comment 1 Justin M. Forbes 2009-12-01 16:47:48 UTC

Thanks for the report.

Comment 2 Paul Jenner 2010-02-05 21:34:12 UTC

Looks to be fixed in at least libvirt-0.7.6-1.fc12.x86_64 from F12+virt-preview as I have the same setup and cannot replicate.

[root@localhost qemu]# rpm -q libvirt qemu-system-x86
libvirt-0.7.6-1.fc12.x86_64
qemu-system-x86-0.12.2-5.fc12.x86_64

virsh dumpxml extract for guest before disconnecting cdrom:

    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/home/vms/install-media/Fedora-12-x86_64-DVD.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='1' unit='0'/>
    </disk>

Boots with qemu args including:

-drive file=/home/vms/install-media/Fedora-12-x86_64-DVD.iso,if=none,media=cdrom,id=drive-ide0-1-0,format=raw

Disconnect the cdrom in virt-manager as above. virsh dumpxml extract now gives:

    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='1' unit='0'/>
    </disk>

Still boots fine with qemu args including:

-drive if=none,media=cdrom,id=drive-ide0-1-0,format=raw

Comment 3 Cole Robinson 2010-03-16 14:48:32 UTC

My guess is this was a transient bug in upstream qemu, since this is working fine for me with F12. Closing as WORKSFORME. mbooth, please reopen if you are still seeing this issue.