[libvirt] [PATCH] lib: fix no zero arg check for iothread_id

[Peter Krempa]

On Mon, Aug 10, 2015 at 17:06:31 +0800, Luyao Huang wrote:
> https://bugzilla.redhat.com/show_bug.cgi?id=1251886
> 
> We do not allow delete an iothread which id is 0 in
> virDomainDelIOThread, but allow it in virDomainAddIOThread,
> Also we will output an error when parse an iothread which id
> is 0.
> 
> Add a check for iothread_id in virDomainAddIOThread to fix
> it.

The limitation that iothread id shall not be 0 comes from the qemu
implementation so I think that we could possibly want to have iothread
id 0 in the future.

I think the check should be done in the qemu driver.

Peter
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