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iommu: Add IOMMU_DOMAIN_NESTED

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Introduce a new domain type for a user I/O page table, which is nested on
top of another user space address represented by a PAGING domain. This
new domain can be allocated by the domain_alloc_user op, and attached to
a device through the existing iommu_attach_device/group() interfaces.

The mappings of a nested domain are managed by user space software, so it
is not necessary to have map/unmap callbacks.

Link: https://lore.kernel.org/r/20231026043938.63898-2-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Lu Baolu 2023-10-25 21:39:29 -07:00 committed by Jason Gunthorpe
parent 2ccabf81dd
commit 54d606816b
1 changed files with 4 additions and 0 deletions
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4
include/linux/iommu.h
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@ -67,6 +67,9 @@ struct iommu_domain_geometry {
#define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */
#define __IOMMU_DOMAIN_NESTED (1U << 6) /* User-managed address space nested
on a stage-2 translation */
#define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
/*
* This are the possible domain-types
@ -93,6 +96,7 @@ struct iommu_domain_geometry {
__IOMMU_DOMAIN_DMA_API | \
__IOMMU_DOMAIN_DMA_FQ)
#define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
#define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED)
struct iommu_domain {
unsigned type;