iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

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tegra241_vintf_init_vsid() maps a guest vSID to a single physical Stream ID
taken from master->streams[0], and only warns when the device does not have
exactly one stream. A device with several streams gets only its first one
mapped, so a guest vSID invalidation cannot reach the others' ATC and IOTLB
entries; a device with none makes master->streams a ZERO_SIZE_PTR, read out
of bounds.

Reject the mapping with -EOPNOTSUPP if master->num_streams is not one.

Fixes: 4dc0d12474 ("iommu/tegra241-cmdqv: Add user-space use support")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Nicolin Chen 2026-07-14 13:55:05 -07:00 • committed by Will Deacon

parent 4379610c79

commit fb292bfc9b

1 changed files with 2 additions and 1 deletions

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

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