[libvirt] [Qemu-devel] [PATCH v2] vl.c: Support multiple CPU ranges on -numa option

[Anthony Liguori]

Paolo Bonzini <pbonzini at redhat.com> writes:

> Il 27/02/2013 18:08, Anthony Liguori ha scritto:
>>> >
>>> > No, no, no.  This makes ':' special, which means you can't have lists of
>>> > anything containing ':'.  Your cure is worse than the disease.  Let go
>>> > of that syntactic high-fructose corn syrup, stick to what we have and
>>> > works just fine, thank you.
>> Yes, there *must* be special syntax.  If we're treating something
>> special, then we should indicate to the user that it's special.
>> 
>> Specifically, a list of integers should look distinctly different than
>> overriding a previously specified integer.
>
> The solution is "there is no way to override a previously specified
> key".  Something like "-device
> virtio-scsi-pci,num_queues=1,num_queues=2" now works, let's make it an
> error instead.

That breaks compatibility.  The above may seem silly but consider:

qemu -device virtio-scsi-pci,num_queues=1,id=foo \
     -set device.foo.num_queues=2

This is more common than you would think primarily as a way to override
options that libvirt has set either via the qemu extra args tag or a
script wrapper of qemu.

Regards,

Anthony Liguori

>
> Paolo