iommu/tegra241-cmdqv: Fix initialization and uAPI related to HYP_OWN

[PATCH 0/2] iommu/tegra241-cmdqv: Fix initialization and uAPI related to HYP_OWN

Posted by Nicolin Chen 3 weeks, 4 days ago

Hi,

Eric and Shameer found a bug in kernel driver that supports_cmd is set in
an incorrect order related to the hyp_own finalization. This results in a
unnecessary command filter in the host environment that sends unsupported
(non-invalidation) commands to the SMMU CMDQ.

Also, Eric pointed it out that the requirement of VMM wiring HYP_OWN to 0
is unclear.

Thus, I am sending this small series to address these issues.

Nicolin Chen (2):
  iommu/tegra241-cmdqv: Set supports_cmd op in tegra241_vcmdq_hw_init()
  iommu/tegra241-cmdqv: Update uAPI to clarify HYP_OWN requirement

 include/uapi/linux/iommufd.h                   | 5 +++++
 drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 7 ++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

-- 
2.43.0

Re: [PATCH 0/2] iommu/tegra241-cmdqv: Fix initialization and uAPI related to HYP_OWN

Posted by Will Deacon 1 week, 6 days ago

On Thu, 12 Mar 2026 17:36:33 -0700, Nicolin Chen wrote:
> Eric and Shameer found a bug in kernel driver that supports_cmd is set in
> an incorrect order related to the hyp_own finalization. This results in a
> unnecessary command filter in the host environment that sends unsupported
> (non-invalidation) commands to the SMMU CMDQ.
> 
> Also, Eric pointed it out that the requirement of VMM wiring HYP_OWN to 0
> is unclear.
> 
> [...]

Applied to iommu (arm/smmu/updates), thanks!

[1/2] iommu/tegra241-cmdqv: Set supports_cmd op in tegra241_vcmdq_hw_init()
      https://git.kernel.org/iommu/c/803e41f36d22
[2/2] iommu/tegra241-cmdqv: Update uAPI to clarify HYP_OWN requirement
      https://git.kernel.org/iommu/c/9dcef98dbee3

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev