On 08/06/2015 10:54 PM, Lin Ma wrote: > Hi Paolo, > > As mentioned in below email, The type of wwn is reported as uint64, But > in qemu command line, The max valid value for wwn is > 0x7fffffffffffffff. Obviously, it's treated as int64 there. I'd like to > know that does the highest bit of _world wide name_ have special > meaning and must be zero? May I have your thoughts?
You can always pass a negative number to set the highest bit (that's what libvirt does: when it is sending a uint64 value to qemu via command line or QMP, it intentionally writes values larger than INT64_MAX by first casting them to signed and writing the int64_t counterpart instead). It's a shortcoming in our data parser, and not an actual prohibition in values you can set. And if you don't like the behavior, patches are welcome. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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