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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2026 06:09:16.6892 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 17ed659c-3f31-437d-8b59-08de53fc9d35 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003F65.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB7462 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Jason Gunthorpe Signed-off-by: Suravee Suthikulpanit --- drivers/iommu/amd/iommu.c | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 6fea4ac97e3d..9b2fd852eb88 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2765,6 +2765,14 @@ static struct iommu_domain *amd_iommu_domain_alloc_p= aging_v2(struct device *dev, return &domain->domain; } =20 +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) @@ -2772,16 +2780,28 @@ amd_iommu_domain_alloc_paging_flags(struct device *= dev, u32 flags, { struct amd_iommu *iommu =3D get_amd_iommu_from_dev(dev); const u32 supported_flags =3D IOMMU_HWPT_ALLOC_DIRTY_TRACKING | - IOMMU_HWPT_ALLOC_PASID; + IOMMU_HWPT_ALLOC_PASID | + IOMMU_HWPT_ALLOC_NEST_PARENT; =20 if ((flags & ~supported_flags) || user_data) return ERR_PTR(-EOPNOTSUPP); =20 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. */ --=20 2.34.1