Hi,

When accel=on is enabled for an SMMUv3 instance, the host hardware SMMUv3
may generate Stage-1 (S1) fault or event notifications that are targeted
toward the vIOMMU instance in userspace.

This series adds support in QEMU to receive such host events through a
vEVENTQ object and propagate them to the guest. The implementation
leverages the vEVENTQ interface provided by the IOMMUFD kernel subsystem.

This is being sent as an RFC since it depends on the "Add support for
user-creatable accelerated SMMUv3" series which is currently under
discussion[0].

I have lightly tested this on a Grace platform with some hacks to generate
faults events. Further testing and feedbacks welcome.

Thanks,
Shameer
[0] https://lore.kernel.org/qemu-devel/20251031105005.24618-1-skolothumtho@nvidia.com/

Nicolin Chen (2):
  backends/iommufd: Introduce iommufd_backend_alloc_veventq
  hw/arm/smmuv3-accel: Allocate vEVENTQ for accelerated SMMUv3 devices

Shameer Kolothum (2):
  hw/arm/smmuv3: Introduce a helper function for event propagation
  hw/arm/smmuv3-accel: Read and propagate host vIOMMU events

 backends/iommufd.c       |  31 ++++++++++
 backends/trace-events    |   1 +
 hw/arm/smmuv3-accel.c    | 123 +++++++++++++++++++++++++++++++++++++++
 hw/arm/smmuv3-accel.h    |   8 +++
 hw/arm/smmuv3-internal.h |   4 ++
 hw/arm/smmuv3.c          |  28 +++++++--
 hw/arm/trace-events      |   2 +-
 include/system/iommufd.h |  12 ++++
 8 files changed, 202 insertions(+), 7 deletions(-)

-- 
2.43.0