iommu/vt-d: Add domain_alloc_user op

mainline inclusion
from mainline-v6.7-rc1
commit c97d1b20d3835178bcd0e3a86c20ce4e36b6d80c
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8Y6AM
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?c97d1b20d3835178bcd0e3a86c20ce4e36b6d80c

--------------------------------

Add the domain_alloc_user() op implementation. It supports allocating
domains to be used as parent under nested translation.

Unlike other drivers VT-D uses only a single page table format so it only
needs to check if the HW can support nesting.

Intel-SIG: c97d1b20d383 iommu/vt-d: Add domain_alloc_user op
Backport IOMMUFD Dirty Tracking

Link: https://lore.kernel.org/r/20230928071528.26258-7-yi.l.liu@intel.com


Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
[ jz: amend commit log ]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>