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iommu/amd: Add support for nest parent domain allocation

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To support nested translation, the nest parent domain is allocated with
IOMMU_HWPT_ALLOC_NEST_PARENT flag, and stores information of the v1 page
table for stage 2 (i.e. GPA->SPA).

Also, only support nest parent domain on AMD system, which can support
the Guest CR3 Table (GCR3TRPMode) feature. This feature is required in
order to program DTE[GCR3 Table Root Pointer] with the GPA.

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Suravee Suthikulpanit 2026-01-15 06:08:08 +00:00 committed by Joerg Roedel
parent b2bb0573dd
commit b43a29def2
1 changed files with 23 additions and 3 deletions
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26
drivers/iommu/amd/iommu.c
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@ -2769,6 +2769,14 @@ static struct iommu_domain *amd_iommu_domain_alloc_paging_v2(struct device *dev,
return &domain->domain;
}
static inline bool is_nest_parent_supported(u32 flags)
{
/* Only allow nest parent when these features are supported */
return check_feature(FEATURE_GT) &&
check_feature(FEATURE_GIOSUP) &&
check_feature2(FEATURE_GCR3TRPMODE);
}
static struct iommu_domain *
amd_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags,
const struct iommu_user_data *user_data)
@ -2776,16 +2784,28 @@ amd_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags,
{
struct amd_iommu *iommu = get_amd_iommu_from_dev(dev);
const u32 supported_flags = IOMMU_HWPT_ALLOC_DIRTY_TRACKING |
IOMMU_HWPT_ALLOC_PASID;
IOMMU_HWPT_ALLOC_PASID |
IOMMU_HWPT_ALLOC_NEST_PARENT;
if ((flags & ~supported_flags) || user_data)
return ERR_PTR(-EOPNOTSUPP);
switch (flags & supported_flags) {
case IOMMU_HWPT_ALLOC_DIRTY_TRACKING:
/* Allocate domain with v1 page table for dirty tracking */
if (!amd_iommu_hd_support(iommu))
case IOMMU_HWPT_ALLOC_NEST_PARENT:
case IOMMU_HWPT_ALLOC_DIRTY_TRACKING | IOMMU_HWPT_ALLOC_NEST_PARENT:
/*
* Allocate domain with v1 page table for dirty tracking
* and/or Nest parent.
*/
if ((flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING) &&
!amd_iommu_hd_support(iommu))
break;
if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) &&
!is_nest_parent_supported(flags))
break;
return amd_iommu_domain_alloc_paging_v1(dev, flags);
case IOMMU_HWPT_ALLOC_PASID:
/* Allocate domain with v2 page table if IOMMU supports PASID. */