If I've got that right, this issue got solved, so I'm closing it now.
Please file a new ticket in our new tracker at gitlab.com if there is
still a problem.
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1875139
Title:
Domain fails to start when 'readonly' device not writable
Status in QEMU:
Fix Released
Bug description:
This issue is introduced in QEMU 4.2.0 (4.1.0 is working fine)
My root disk is a LVM2 volume thin snapshot that is marked as read-only
But when I try to start the domain (using virt-manager) I get the following
error:
Error starting domain: internal error: process exited while connecting
to monitor: 2020-04-26T06:55:06.342700Z qemu-system-x86_64: -blockdev
{"driver":"host_device","filename":"/dev/vg/vmroot-20200425","aio":"native
","node-name":"libvirt-3-storage","cache":{"direct":true,"no-
flush":false},"auto-read-only":true,"discard":"unmap"} The device is
not writable: Permission denied
Changing the lvm snapshot to writeable allows me to start the domain.
(Making it changes possible during domain is running)
I don't think QEMU should fail when it can't open a (block) device when the
read-only option is set.
(why is write access needed?)
Reproduce steps:
* Create LVM read-only volume (I don't think any data is needed)
* Create domain with read-only volume as block device
* Try to start the domain
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