vfio: Add support for Shared Virtual Addressing

hulk inclusion
category: feature
bugzilla: 14369
CVE: NA
-------------------

Add two new ioctls for VFIO containers. VFIO_IOMMU_BIND_PROCESS creates a
bond between a container and a process address space, identified by a
Process Address Space ID (PASID). Devices in the container append this
PASID to DMA transactions in order to access the process' address space.
The process page tables are shared with the IOMMU, and mechanisms such as
PCI ATS/PRI are used to handle faults. VFIO_IOMMU_UNBIND_PROCESS removes a
bond created with VFIO_IOMMU_BIND_PROCESS.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Fang Lijun <fanglijun3@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>