Re: [Qemu-devel] [sneak preview] major scsi overhaul

[Avi Kivity]

On 11/09/2009 03:39 PM, Gerd Hoffmann wrote:
>   Hi,
>
> > > Doesn't fly. Either every SCSI HBA uses QEMUSG64List (thus making this
> > > aequivalent to the next option from the scsi point of view), or
> > > scsi-disk would have to support both formats.
> >
> > A device or device set which is always 64-bit would always use
> > QEMUSG64List. A device which is always 32-bit would use QEMUSG32List.
>
> A scsi-disk can be connected to both 32-bit and 64-bit HBAs though ...

A line has to be drawn.  Since we have a limited number of HBAs, and 
since the performance impact will be minimal, we can safely use 64-bit 
for scsi.

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