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charset="utf-8" From hardware implementation perspective, a guest tegra241-cmdqv hardware is different than the host hardware: - Host HW is backed by a VINTF (HYP_OWN=3D1) - Guest HW is backed by a VINTF (HYP_OWN=3D0) The kernel driver has an implementation requirement of the HYP_OWN bit in the VM. So, VMM must follow that to allow the same copy of Linux to work. Add this requirement to the uAPI, which is currently missing. Fixes: 4dc0d12474f9 ("iommu/tegra241-cmdqv: Add user-space use support") Signed-off-by: Nicolin Chen Reviewed-by: Eric Auger Reviewed-by: Jason Gunthorpe --- include/uapi/linux/iommufd.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 1dafbc552d37d..f63edbe71d542 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -1052,6 +1052,11 @@ struct iommu_fault_alloc { enum iommu_viommu_type { IOMMU_VIOMMU_TYPE_DEFAULT =3D 0, IOMMU_VIOMMU_TYPE_ARM_SMMUV3 =3D 1, + /* + * TEGRA241_CMDQV requirements (otherwise, VCMDQs will not work) + * - Kernel will allocate a VINTF (HYP_OWN=3D0) to back this VIOMMU. So, + * VMM must wire the HYP_OWN bit to 0 in guest VINTF_CONFIG register + */ IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV =3D 2, }; =20 --=20 2.43.0