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iommufd: Allow allocating PASID-compatible domain

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The underlying infrastructure has supported the PASID attach and related
enforcement per the requirement of the IOMMU_HWPT_ALLOC_PASID flag. This
extends iommufd to support PASID compatible domain requested by userspace.

Link: https://patch.msgid.link/r/20250321171940.7213-15-yi.l.liu@intel.com
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu
2025-03-25 10:18:31 -03:00
committed by Jason Gunthorpe
parent ce15c13e7a
commit dbc5f37b4f
2 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/iommu/iommufd/hw_pagetable.c
+4 -3
View File
@@ -112,7 +112,8 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
{
const u32 valid_flags = IOMMU_HWPT_ALLOC_NEST_PARENT |
IOMMU_HWPT_ALLOC_DIRTY_TRACKING |
IOMMU_HWPT_FAULT_ID_VALID;
IOMMU_HWPT_FAULT_ID_VALID |
IOMMU_HWPT_ALLOC_PASID;
const struct iommu_ops *ops = dev_iommu_ops(idev->dev);
struct iommufd_hwpt_paging *hwpt_paging;
struct iommufd_hw_pagetable *hwpt;
@@ -233,7 +234,7 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx,
struct iommufd_hw_pagetable *hwpt;
int rc;
if ((flags & ~IOMMU_HWPT_FAULT_ID_VALID) ||
if ((flags & ~(IOMMU_HWPT_FAULT_ID_VALID | IOMMU_HWPT_ALLOC_PASID)) ||
!user_data->len || !ops->domain_alloc_nested)
return ERR_PTR(-EOPNOTSUPP);
if (parent->auto_domain || !parent->nest_parent ||
@@ -290,7 +291,7 @@ iommufd_viommu_alloc_hwpt_nested(struct iommufd_viommu *viommu, u32 flags,
struct iommufd_hw_pagetable *hwpt;
int rc;
if (flags & ~IOMMU_HWPT_FAULT_ID_VALID)
if (flags & ~(IOMMU_HWPT_FAULT_ID_VALID | IOMMU_HWPT_ALLOC_PASID))
return ERR_PTR(-EOPNOTSUPP);
if (!user_data->len)
return ERR_PTR(-EOPNOTSUPP);
include/uapi/linux/iommufd.h
+3
View File
@@ -393,6 +393,9 @@ struct iommu_vfio_ioas {
* Any domain attached to the non-PASID part of the
* device must also be flagged, otherwise attaching a
* PASID will blocked.
* For the user that wants to attach PASID, ioas is
* not recommended for both the non-PASID part
* and PASID part of the device.
* If IOMMU does not support PASID it will return
* error (-EOPNOTSUPP).
*/