[PATCH v8 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ)
Zhangfei Gao
zhangfei.gao at linaro.org
Fri Feb 28 20:16:00 PST 2025
On Wed, 26 Feb 2025 at 01:33, Nicolin Chen <nicolinc at nvidia.com> wrote:
>
> As the vIOMMU infrastructure series part-3, this introduces a new vEVENTQ
> object. The existing FAULT object provides a nice notification pathway to
> the user space with a queue already, so let vEVENTQ reuse that.
>
> Mimicing the HWPT structure, add a common EVENTQ structure to support its
> derivatives: IOMMUFD_OBJ_FAULT (existing) and IOMMUFD_OBJ_VEVENTQ (new).
>
> An IOMMUFD_CMD_VEVENTQ_ALLOC is introduced to allocate vEVENTQ object for
> vIOMMUs. One vIOMMU can have multiple vEVENTQs in different types but can
> not support multiple vEVENTQs in the same type.
>
> The forwarding part is fairly simple but might need to replace a physical
> device ID with a virtual device ID in a driver-level event data structure.
> So, this also adds some helpers for drivers to use.
>
> As usual, this series comes with the selftest coverage for this new ioctl
> and with a real world use case in the ARM SMMUv3 driver.
>
> This is on Github:
> https://github.com/nicolinc/iommufd/commits/iommufd_veventq-v8
> Paring QEMU branch for testing:
> https://github.com/nicolinc/qemu/commits/wip/for_iommufd_veventq-v8
Thanks Nico
Tested-by: Zhangfei Gao <zhangfei.gao at linaro.org>
After rebase on your branch
https://github.com/Linaro/linux-kernel-warpdrive/tree/iommufd_veventq-v8
https://github.com/Linaro/qemu/tree/for_iommufd_veventq-v8
Tested with multi-device in guests, with io page faults happen.
Thanks
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