On Fri, 27 Mar 2026 08:30:45 +0000
Michael Kelly <[email protected]> wrote:
> The argument list passed to qemu-system-x86_64 when my image is launched
> from the virtual machine manager is very long but does boot successfully
> using the i440FX chipset with piixide driver. I've attached that to
> avoid cluttering this reply in case anyone can spot the arguments that
> make the difference. I can't see any difference in the console output
> between the successful and unsuccessful cases up until the
> 'Input/output' error.
When the qemu VM is managed by libvirt, it is possible to send 'monitor'
commands using virsh's "qemu-monitor-command" (most useful with the '--hmp'
flag).
This enables to retrieve the "qtree", which might be interesting when compared
with a command-line spawned VM.
Here is the command that worked for me:
virsh -c qemu:///session qemu-monitor-command hurd-amd64 --hmp info qtree
It revealed that the libvirt managed VM has a sata PCI controller with a disk
in IDE mode. Indeed, the qemu command-line here is a bit different since it has
`-device {"driver":"ide-hd","bus":"sata0.0"...`
I hope this command can help you figure out the difference on your side.
Regards,
--
Olivier Valentin <[email protected]>
