This patchset proposes a solution to report hardware IOMMU fault
event to userspace. Motivation is to make vIOMMU in Qemu get physical
fault event and info from IOMMU hardware. vIOMMU is in charge of transforming
fault info and inject to guest. The feature is also very important to
support first level translation(Translation request with PASID) in VM
which requires vIOMMU to inject device page request to VM.
Introduce two new VFIO cmd for VFIO IOMMU type1 driver
- VFIO_IOMMU_SET_FAULT_EVENT_FD
Receive eventfd from user space and trigger eventfd when get fault event
from IOMMU.
- VFIO_IOMMU_GET_FAULT_INFO
Return IOMMU fault info to userspace.
VFIO IOMMU Type1 driver needs to register IOMMU fault event notifier
to IOMMU driver for assigned devices when they are attached to VFIO
container. IOMMU driver will run VFIO fault event callback when hardware
IOMMU triggers fault events for devices assigned to VFIO container. Then,
type1 driver signals eventfd provided by userspace and usrspace gets fault
info via new cmd.
IOMMU interface are still in design stage and so we still can't register
IOMMU fault event notifier to IOMMU driver. This patchset is prototype
code to check whether VFIO IOMMU type1 driver is suitable place to deal
with IOMMU fault event and just passes build test.
Very appreciate for comments.
Lan Tianyu (3):
VFIO: Add new cmd to receive eventfd from userspace to notify IOMMU
fault event
VFIO: Add IOMMU fault notifier callback
VFIO: Add new cmd for user space to get IOMMU fault info
drivers/vfio/vfio_iommu_type1.c | 106 ++++++++++++++++++++++++++++++++++++++++
include/linux/iommu.h | 7 +++
include/uapi/linux/vfio.h | 37 ++++++++++++++
3 files changed, 150 insertions(+)
--
1.8.3.1
