mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-16 10:11:38 -04:00
Code Issues Packages Projects Releases Wiki Activity

iommu/tegra241-cmdqv: Update uAPI to clarify HYP_OWN requirement

Browse Source 
>From hardware implementation perspective, a guest tegra241-cmdqv hardware
is different than the host hardware:
 - Host HW is backed by a VINTF (HYP_OWN=1)
 - Guest HW is backed by a VINTF (HYP_OWN=0)

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: 4dc0d12474 ("iommu/tegra241-cmdqv: Add user-space use support")
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Nicolin Chen
2026-03-12 17:36:35 -07:00
committed by Will Deacon
parent 803e41f36d
commit 9dcef98dbe
1 changed files with 5 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/uapi/linux/iommufd.h
View File

@@ -1052,6 +1052,11 @@ struct iommu_fault_alloc {
enum iommu_viommu_type {
IOMMU_VIOMMU_TYPE_DEFAULT = 0,
IOMMU_VIOMMU_TYPE_ARM_SMMUV3 = 1,
/*
* TEGRA241_CMDQV requirements (otherwise, VCMDQs will not work)
* - Kernel will allocate a VINTF (HYP_OWN=0) to back this VIOMMU. So,
* VMM must wire the HYP_OWN bit to 0 in guest VINTF_CONFIG register
*/
IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV = 2,
};