* Avi Kivity (a...@redhat.com) wrote: > On 07/15/2010 08:17 PM, Chris Wright wrote: > > > >>For emulated device, it seems like we can ignore ATS completely, no? > >Not if you want to emulate an ATS capable device ;) > > What I meant was that the whole request translation, invalidate, dma > using a translated address thing is invisible to software. We can > emulate an ATS capable device by going through the iommu every time.
Well, I don't see any reason to completely ignore it. It'd be really useful for testing (I'd use it that way). Esp to verify the invalidation of the device IOTLBs. But I think it's not a difficult thing to emulate once we have a proper api encapsulating a device's dma request. thanks, -chris
