iommu/tegra241-cmdqv: Limit CMDs for VCMDQs of a guest owned VINTF

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When VCMDQs are assigned to a VINTF owned by a guest (HYP_OWN bit unset),
only TLB and ATC invalidation commands are supported by the VCMDQ HW. So,
implement the new cmdq->supports_cmd op to scan the input cmd in order to
make sure that it is supported by the selected queue.

Note that the guest VM shouldn't have HYP_OWN bit being set regardless of
guest kernel driver writing it or not, i.e. the hypervisor running in the
host OS should wire this bit to zero when trapping a write access to this
VINTF_CONFIG register from a guest kernel.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/8160292337059b91271045800e5c62f7295e2c24.1724970714.git.nicolinc@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

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Nicolin Chen 2024-08-29 15:34:39 -07:00 • committed by Will Deacon

parent f59e854907

commit a9d40285bd

3 changed files with 51 additions and 14 deletions

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28

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

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3

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h

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34

drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c

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