[PATCH V3 0/3] vDPA: API for reporting IOVA range

[Jason Wang]

Hi All:

This series introduces API for reporing IOVA range. This is a must for
userspace to work correclty:

- for the process that uses vhost-vDPA directly, the IOVA must be
  allocated from this range.
- for VM(qemu), when vIOMMU is not enabled, fail early if GPA is out
  of range
- for VM(qemu), when vIOMMU is enabled, determine a valid guest
  address width and then guest IOVA allocator can behave correctly.

Please review.

Changes from V2:
- silent build warnings

Changes from V1:

- do not mandate get_iova_range() for device with its own DMA
  translation logic and assume a [0, ULLONG_MAX] range
- mandate IOVA range only for IOMMU that forcing aperture
- forbid the map which is out of the IOVA range in vhost-vDPA

Jason Wang (3):
  vdpa: introduce config op to get valid iova range
  vhost: vdpa: report iova range
  vdpa_sim: implement get_iova_range()

 drivers/vdpa/vdpa_sim/vdpa_sim.c | 12 ++++++++++
 drivers/vhost/vdpa.c             | 40 ++++++++++++++++++++++++++++++++
 include/linux/vdpa.h             | 15 ++++++++++++
 include/uapi/linux/vhost.h       |  4 ++++
 include/uapi/linux/vhost_types.h |  9 +++++++
 5 files changed, 80 insertions(+)

-- 
2.20.1