OK, in the interest of making progress, I am about to embark on the following:
1. Create a user-iommu-domain driver - opening it will give a new empty domain.
Ultimately this can also populate sysfs with the state of its world, which would
also be a good addition to the base iommu stuff.
If someone closes the fd while in use, the domain stays valid anyway until users
drop off.
2. Add DOMAIN_SET and DOMAIN_UNSET ioctls to the vfio driver. Require that
a domain be set before using the VFIO_DMA_MAP_IOVA ioctl (this is the one
that KVM wants). However, the VFIO_DMA_MAP_ANYWHERE ioctl is the one
which uses the dma_sg interface which has no expicit control of domains. I
intend to keep it the way it is, but expect only non-hypervisor programs would
want to use it.
3. Clean up the docs and other nits that folks have found.
Comments?
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