Re: [Qemu-devel] Re: [PATCHv2] qemu: target library, use it in msix

[Avi Kivity]

On 09/27/2009 04:21 PM, Michael S. Tsirkin wrote:
> > How can the caller (except in your special case) know if it has a
> > quantity that will fit in 32 bits?
> >      
> It's actually not unusual for devices to limit addressing to 32 bit, whatever
> the bus supports.  For example, the value might come from a 32 bit pci
> bar, even on a 64 bit system this will get values 0 to 4G.
>    

What if the caller is a device that doesn't intentionally cripple itself?

--
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.