Jason Gunthorpe 35890f8557 vfio: Remove VFIO_TYPE1_NESTING_IOMMU ... This control causes the ARM SMMU drivers to choose a stage 2 implementation for the IO pagetable (vs the stage 1 usual default), however this choice has no significant visible impact to the VFIO user. Further qemu never implemented this and no other userspace user is known. The original description in commit f5c9ecebaf ("vfio/iommu_type1: add new VFIO_TYPE1_NESTING_IOMMU IOMMU type") suggested this was to "provide SMMU translation services to the guest operating system" however the rest of the API to set the guest table pointer for the stage 1 and manage invalidation was never completed, or at least never upstreamed, rendering this part useless dead code. Upstream has now settled on iommufd as the uAPI for controlling nested translation. Choosing the stage 2 implementation should be done by through the IOMMU_HWPT_ALLOC_NEST_PARENT flag during domain allocation. Remove VFIO_TYPE1_NESTING_IOMMU and everything under it including the enable_nesting iommu_domain_op. Just in-case there is some userspace using this continue to treat requesting it as a NOP, but do not advertise support any more. Acked-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Mostafa Saleh <smostafa@google.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Reviewed-by: Donald Dutile <ddutile@redhat.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/1-v4-9e99b76f3518+3a8-smmuv3_nesting_jgg@nvidia.com Signed-off-by: Will Deacon <will@kernel.org>		2024-11-05 10:24:16 +00:00
..
asm-generic	net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags	2024-09-11 20:44:32 -07:00
drm	Linux 6.11-rc7	2024-09-11 09:18:15 +02:00
linux	vfio: Remove VFIO_TYPE1_NESTING_IOMMU	2024-11-05 10:24:16 +00:00
misc	Revert "misc: fastrpc: Restrict untrusted app to attach to privileged PD"	2024-08-15 16:59:14 +02:00
mtd	ubi: fastmap: Add control in 'UBI_IOCATT' ioctl to reserve PEBs for filling pools	2023-10-28 23:16:00 +02:00
rdma	RDMA/nldev: Expose whether RDMA monitoring is supported	2024-09-13 08:29:34 +03:00
regulator	uapi: regulator: Fix typo	2024-01-04 13:22:24 +00:00
scsi	scsi: mpi3mr: Add ioctl support for HDB	2024-06-26 23:30:09 -04:00
sound	Merge branch 'for-linus' into for-next	2024-09-10 10:28:00 +02:00
video
xen	xen/privcmd: Add new syscall to get gsi from dev	2024-09-25 09:54:55 +02:00
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