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Message #78860
[Bug 1831538] Re: IDE config drive CDROM doesn't work with q35 machine type
Reviewed: https://review.opendev.org/663011
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=527c452a6fc05a316eb8121796f761af97522772
Submitter: Zuul
Branch: master
commit 527c452a6fc05a316eb8121796f761af97522772
Author: Lee Yarwood <lyarwood@xxxxxxxxxx>
Date: Tue Jun 4 11:57:18 2019 +0100
libvirt: Use SATA bus for cdrom devices when using Q35 machine type
The Q35 machine type no longer provides an IDE bus and will need to use
a SATA bus to attach legacy devices such as cdroms. More details can be
found in the following related bug:
Don't assume the guest machine type to be of 'pc'
https://bugs.launchpad.net/nova/+bug/1780138
This change now ensures the blockinfo.get_disk_bus_for_device_type
method will now return "sata" as the bus type when the Q35 machine type
is used for cdrom devices on QEMU or KVM hosts that are not PPC, S390 or
AArch64 based.
To enable this the _get_machine_type method has been extracted from the
Libvirt driver into the Libvirt utils module. This method has also been
simplified through the removal of the caps parameter, replaced with
calls to the get_arch utility method and additional extraction of
architecture specific defaults into the existing
get_default_machine_type utility method.
Related-bug: 1780138
Closes-bug: 1831538
Change-Id: Id97f4baddcf2caff91599773d9b5de5181b7fdf6
** Changed in: nova
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1831538
Title:
IDE config drive CDROM doesn't work with q35 machine type
Status in OpenStack Compute (nova):
Fix Released
Bug description:
Description
===========
Setting [libvirt]/hw_machine_type=x86_64=q35 in nova-cpu.conf results
in any instances booted with a config drive to fail to spawn.
Steps to reproduce
==================
1. Set [libvirt]/hw_machine_type=x86_64=q35 in nova-cpu.conf
2. Boot an instance with a config drive
Expected result
===============
Instance boots correctly.
Actual result
=============
Instance fails to spawn with following error in the compute log:
libvirt.libvirtError: unsupported configuration: IDE controllers are
unsupported for this QEMU binary or machine type
Environment
===========
This was reported on OSP15 CI [1] and has been reproduced upstream
[2].
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1716358
[2] https://review.opendev.org/#/c/662887/
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References