For QEMU, the majority of the work in enabling instruction interpretation
is handled via a new KVM ioctls to enable interpretation, interrupt
forwarding and registration of the guest IOAT tables. In order to make
use of the KVM-managed IOMMU domain operations on the host, we also add
some code to vfio to indicate that a given device wishes to register the
alternate domain type for its group.
This series also adds a new, optional 'interpret' parameter to zpci which
can be used to disable interpretation support (interpret=off) as well as
an 'forwarding_assist' parameter to determine whether or not the firmware
assist will be used for interrupt delivery (default when interpretation
is in use) or whether the host will be responsible for delivering all
interrupts (forwarding_assist=off).
The ZPCI_INTERP CPU feature is added beginning with the z14 model to
enable this support.
As a consequence of implementing zPCI interpretation, ISM devices now
become eligible for passthrough (but only when zPCI interpretation is
available).
