diff options
| author | Nicolin Chen <nicolinc@nvidia.com> | 2024-10-30 21:20:49 -0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-11-05 10:24:17 +0000 |
| commit | 6912ec91828b8d7f21b393befad1c36dadbcd751 (patch) | |
| tree | 8b506e00fdbceba7bd036f3068b0d369c4181709 /drivers/iommu/Kconfig | |
| parent | e89573cf4a13ca4e314d03d56ac84c0ba2af464b (diff) | |
iommu/arm-smmu-v3: Support IOMMU_GET_HW_INFO via struct arm_smmu_hw_info
For virtualization cases the IDR/IIDR/AIDR values of the actual SMMU
instance need to be available to the VMM so it can construct an
appropriate vSMMUv3 that reflects the correct HW capabilities.
For userspace page tables these values are required to constrain the valid
values within the CD table and the IOPTEs.
The kernel does not sanitize these values. If building a VMM then
userspace is required to only forward bits into a VM that it knows it can
implement. Some bits will also require a VMM to detect if appropriate
kernel support is available such as for ATS and BTM.
Start a new file and kconfig for the advanced iommufd support. This lets
it be compiled out for kernels that are not intended to support
virtualization, and allows distros to leave it disabled until they are
shipping a matching qemu too.
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/5-v4-9e99b76f3518+3a8-smmuv3_nesting_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/Kconfig')
| -rw-r--r-- | drivers/iommu/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index b3aa1f5d5321..0c9bceb1653d 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -415,6 +415,15 @@ config ARM_SMMU_V3_SVA Say Y here if your system supports SVA extensions such as PCIe PASID and PRI. +config ARM_SMMU_V3_IOMMUFD + bool "Enable IOMMUFD features for ARM SMMUv3 (EXPERIMENTAL)" + depends on IOMMUFD + help + Support for IOMMUFD features intended to support virtual machines + with accelerated virtual IOMMUs. + + Say Y here if you are doing development and testing on this feature. + config ARM_SMMU_V3_KUNIT_TEST tristate "KUnit tests for arm-smmu-v3 driver" if !KUNIT_ALL_TESTS depends on KUNIT |