Re: [libvirt-users] Passing non-standard Options through Libvirt to QEMU
On Thu, Apr 10, 2014 at 11:31:11AM +0500, Asadullah Hussain wrote:
There are a couple of problems with passthrough qemu:
1. virsh version/capabilities command executes "qemu -help" but this gives
an error in my case because my customized qemu has to receive mandatory
non-standard parameters "qemu -c -n -- -help".
Two things
- With any reasoanbly recent QEMU version, libvirt no longer uses -help
but instead probes via QMP. it runs
$QEMU -S -no-user-config -nodefaults -nographic -M none -qmp ..somepath... -pidfile
...somepath... --daemonize
- If you are customizing QEMU it is your responsibility to ensure you
don't break the above invocation, or equivalently qemu -help.
Requiring mandatory non-standard args in either of these cases is just
plain broken design. You should only require those args when actually
running a full QEMU VM.
2. Similarly when passing arguments as passthrough in a VMs XML. How
can I
make sure that these non-standard arguments are passed first i.e., My qemu
command for a VM should be "qemu -c -n -- <Rest of the standard
parameters>"
You can't - you should allow the args to appear in any order. Command
line flag order should not be relevant.
Regards,
Daniel
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