Re: [PATCH v2 0/4] vEVENTQ support for accelerated SMMUv3 devices

[Eric Auger <eric.auger@redhat.com>]

On 12/4/25 10:22 AM, Shameer Kolothum wrote:
> Hi,
>
> Changes from RFC v1:
> https://lore.kernel.org/qemu-devel/20251105154657.37386-1-skolothumtho@nvidia.com/
>
>  -Rebased on v6[0] of the "accelerated SMMUv3" series
>  -Addressed feedback on the RFC. Thanks!
>  -Dropped the RFC tag as the accelerated series is now more mature, and once
>   that lands, it makes sense to pick this up as well since it enables the
>   delivery of SMMUv3 events to the guest.
>
> When accel=on is enabled for an SMMUv3 instance, the host hardware SMMUv3
> may generate Stage-1 (S1) fault or event notifications that are intended
> for the vIOMMU instance in userspace.
>
> This series adds QEMU support for receiving such host events through the
> vEVENTQ interface and propagating them to the guest. The implementation
> uses the vEVENTQ support provided by the IOMMUFD subsystem in the kernel.
>
> I have lightly this on a Grace platform using some hacks to generate fault
tested

Eric
> events. Further testing and feedback are welcome.
>
> Thanks,
> Shameer
>
> [0]https://lore.kernel.org/qemu-devel/20251120132213.56581-1-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    | 120 ++++++++++++++++++++++++++++++++++++++-
>  hw/arm/smmuv3-accel.h    |   8 +++
>  hw/arm/smmuv3-internal.h |   4 ++
>  hw/arm/smmuv3.c          |  25 ++++++--
>  hw/arm/trace-events      |   2 +-
>  include/system/iommufd.h |  12 ++++
>  8 files changed, 195 insertions(+), 8 deletions(-)
>