On Sat, Feb 22, 2025 at 07:54:02AM -0800, Nicolin Chen wrote:

Introduce a new IOMMUFD_OBJ_VEVENTQ object for vIOMMU Event Queue that
provides user space (VMM) another FD to read the vIOMMU Events.

Allow a vIOMMU object to allocate vEVENTQs, with a condition that each
vIOMMU can only have one single vEVENTQ per type.

Add iommufd_veventq_alloc() with iommufd_veventq_ops for the new ioctl.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <redacted>
---
 drivers/iommu/iommufd/iommufd_private.h |  82 ++++++++++
 include/linux/iommufd.h                 |   3 +
 include/uapi/linux/iommufd.h            |  82 ++++++++++
 drivers/iommu/iommufd/eventq.c          | 209 +++++++++++++++++++++++-
 drivers/iommu/iommufd/main.c            |   7 +
 drivers/iommu/iommufd/viommu.c          |   2 +
 6 files changed, 384 insertions(+), 1 deletion(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason