Re: [Qemu-devel] [PATCH] add iommu version to sparc32

[Robert Reif]

> > Add iommu version to sparc32.  Also reset iommu after initialization.
> >    
>
> Should the version be tied to CPU model instead of machine type? At
> least for Turbosparc this seems to be the case. 
>  
On SMP systems the IOMMU is on the system board in a separate ASIC.  On
single CPU systems the IOMMU is integrated into the CPU.  Without checking
the FEH, the SS 5 was the only single CPU system that shipped with more than
one family of CPUs (MicroSparc II and TurboSparc and they do have different
IOMMU versions).  That could be special cased.

Unfortunately QEMU will allow you to specify unrealistic systems.  We 
should
probably add allowable CPU types to specific machine types to catch this.