Re: [Qemu-devel] [RFC v1 3/7] memory: iommu support

[Paolo Bonzini]

Il 11/10/2012 15:45, Avi Kivity ha scritto:
>>> >> +struct MemoryRegionIOMMUOps {
>>> >> +    /* Returns a TLB entry that contains a given address. */
>>> >> +    IOMMUTLBEntry (*translate)(MemoryRegion *iommu, target_phys_addr_t 
>>> >> addr,
>>> >> +                               bool is_write);
>>> >> +};
>> > 
>> > Do map/unmap still make sense in this model?  Ben & David, what were
>> > your plans there?
>> > 
> Map/unmap is supported via address_space_map(), which calls
> ->translate().  I don't see how a lower-level map/unmap helps, unless
> the hardware supplies such a function.

Yep, it's just the map/unmap callbacks that are not supported anymore,
but nobody uses that feature of DMAContext yet.

Paolo