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8c73c32c83
This was needed because the STE code required the STE to be in ABORT/BYPASS inorder to program a cdtable or S2 STE. Now that the STE code can automatically handle all transitions we can remove this step from the attach_dev flow. A few small bugs exist because of this: 1) If the core code does BLOCKED -> UNMANAGED with disable_bypass=false then there will be a moment where the STE points at BYPASS. Since this can be done by VFIO/IOMMUFD it is a small security race. 2) If the core code does IDENTITY -> DMA then any IOMMU_RESV_DIRECT regions will temporarily become BLOCKED. We'd like drivers to work in a way that allows IOMMU_RESV_DIRECT to be continuously functional during these transitions. Make arm_smmu_release_device() put the STE back to the correct ABORT/BYPASS setting. Fix a bug where a IOMMU_RESV_DIRECT was ignored on this path. As noted before the reordering of the linked list/STE/CD changes is OK against concurrent arm_smmu_share_asid() because of the arm_smmu_asid_lock. Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Tested-by: Moritz Fischer <moritzf@google.com> Reviewed-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/7-v6-96275f25c39d+2d4-smmuv3_newapi_p1_jgg@nvidia.com Signed-off-by: Will Deacon <will@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.