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iommufd: Support allocating nested parent domain

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Extend IOMMU_HWPT_ALLOC to allocate domains to be used as parent (stage-2)
in nested translation.

Add IOMMU_HWPT_ALLOC_NEST_PARENT to the uAPI.

Link: https://lore.kernel.org/r/20230928071528.26258-5-yi.l.liu@intel.com
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu 2023-09-28 00:15:26 -07:00 committed by Jason Gunthorpe
parent 89d63875d8
commit 4ff5421633
2 changed files with 15 additions and 2 deletions
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5
drivers/iommu/iommufd/hw_pagetable.c
View file

@ -83,6 +83,9 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
lockdep_assert_held(&ioas->mutex);
if (flags && !ops->domain_alloc_user)
return ERR_PTR(-EOPNOTSUPP);
hwpt = iommufd_object_alloc(ictx, hwpt, IOMMUFD_OBJ_HW_PAGETABLE);
if (IS_ERR(hwpt))
return hwpt;
@ -154,7 +157,7 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd)
struct iommufd_ioas *ioas;
int rc;
if (cmd->flags || cmd->__reserved)
if ((cmd->flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT)) || cmd->__reserved)
return -EOPNOTSUPP;
idev = iommufd_get_device(ucmd, cmd->dev_id);

12
include/uapi/linux/iommufd.h
View file

@ -347,10 +347,20 @@ struct iommu_vfio_ioas {
};
#define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS)
/**
* enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation
* @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a domain which can serve
* as the parent domain in the nesting
* configuration.
*/
enum iommufd_hwpt_alloc_flags {
IOMMU_HWPT_ALLOC_NEST_PARENT = 1 << 0,
};
/**
* struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC)
* @size: sizeof(struct iommu_hwpt_alloc)
* @flags: Must be 0
* @flags: Combination of enum iommufd_hwpt_alloc_flags
* @dev_id: The device to allocate this HWPT for
* @pt_id: The IOAS to connect this HWPT to
* @out_hwpt_id: The ID of the new HWPT