> > Depending how the we decide to handle IOMMU invalidation, it may also be > > necessary to augment the memory_map API to allow the system to request a > > mapping be revoked. However this issue is not specific to the IOMMU > > implementation. Such bugs are already present on any system that allows > > dynamic reconfiguration of the address space, e.g. by changing PCI BARs. > > That's why the memory_map API today does not allow mappings to persist > after trips back to the main loop.
Sure it does. If you can't combine zero-copy memory access with asynchronous IO then IMO it's fairly useless. See e.g. dma-helpers.c Paul
