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

[Paolo Bonzini]

Il 27/02/2013 18:38, Anthony Liguori ha scritto:
>> > 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.

"-set" could first delete a pre-existing option.  We could also extend
"-set" to accept multiple values (like -set
device.foo.bar=baz,device.foo.qux=quux), which is useful also to set a
list option.

Paolo