Commit b43a29de authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Joerg Roedel
Browse files

iommu/amd: Add support for nest parent domain allocation 



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: default avatarNicolin Chen <nicolinc@nvidia.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent b2bb0573

drivers/iommu/amd/iommu.c

+23 −3
Original line number Diff line number Diff line
@@ -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. */