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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jan 2026 01:24:53.3902 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3a2bf0d1-3f62-4077-304f-08de59550b9e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015C9.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PPF711010B62 Content-Type: text/plain; charset="utf-8" A VMID held by a vSMMU is required to setup hardware (e.g. tegra241-cmdqv) during its initialization. So, it should be allocated in the ->viommu_init callback. This makes the VMID lifecycle unique than a VMID allocated for a naked S2 attachment. Introduce an INV_TYPE_S2_VMID_VSMMU to accommodate this case. Note that a second device attaching to a nested domain associated with the same vSMMU instance will have an INV_TYPE_S2_VMID_VSMMU and reuse the VMID held by the vSMMU. Devices attaching directly to the nesting parent domain will have an INV_TYPE_S2_VMID and shouldn't resue the VMID from the vSMMU. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 18 +++++++++++++++--- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.h index 386ac75879c0..8365660282d5 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -656,6 +656,7 @@ struct arm_smmu_cmdq_batch { enum arm_smmu_inv_type { INV_TYPE_S1_ASID, INV_TYPE_S2_VMID, + INV_TYPE_S2_VMID_VSMMU, INV_TYPE_S2_VMID_S1_CLEAR, INV_TYPE_ATS, INV_TYPE_ATS_FULL, diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.c index 8323f74c8923..6d3da3f82ec8 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -1904,7 +1904,8 @@ void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste = *target, u64 vtcr_val; struct arm_smmu_device *smmu =3D master->smmu; =20 - WARN_ON(tag->type !=3D INV_TYPE_S2_VMID); + WARN_ON(tag->type !=3D INV_TYPE_S2_VMID && + tag->type !=3D INV_TYPE_S2_VMID_VSMMU); =20 memset(target, 0, sizeof(*target)); target->data[0] =3D cpu_to_le64( @@ -2592,6 +2593,7 @@ static void __arm_smmu_domain_inv_range(struct arm_sm= mu_invs *invs, granule); break; case INV_TYPE_S2_VMID: + case INV_TYPE_S2_VMID_VSMMU: cmd.tlbi.vmid =3D cur->id; cmd.tlbi.leaf =3D leaf; arm_smmu_inv_to_cmdq_batch(cur, &cmds, &cmd, iova, size, @@ -3149,7 +3151,10 @@ int arm_smmu_domain_get_iotlb_tag(struct arm_smmu_do= main *smmu_domain, tag->type =3D INV_TYPE_S1_ASID; break; case ARM_SMMU_DOMAIN_S2: - tag->type =3D INV_TYPE_S2_VMID; + if (vsmmu) + tag->type =3D INV_TYPE_S2_VMID_VSMMU; + else + tag->type =3D INV_TYPE_S2_VMID; break; default: return -EINVAL; @@ -3163,6 +3168,12 @@ int arm_smmu_domain_get_iotlb_tag(struct arm_smmu_do= main *smmu_domain, return ret; =20 /* Allocate a new IOTLB cache tag (users counter =3D=3D 0) */ + if (tag->type =3D=3D INV_TYPE_S2_VMID_VSMMU) { + /* Use the pre-allocated VMID from vSMMU */ + tag->id =3D vsmmu->vmid; + return 0; + } + lockdep_assert_held(&arm_smmu_asid_lock); =20 if (tag->type =3D=3D INV_TYPE_S1_ASID) { @@ -3233,6 +3244,7 @@ arm_smmu_master_build_inv(struct arm_smmu_master *mas= ter, } break; case INV_TYPE_S2_VMID: + case INV_TYPE_S2_VMID_VSMMU: cur->size_opcode =3D CMDQ_OP_TLBI_S2_IPA; cur->nsize_opcode =3D CMDQ_OP_TLBI_S12_VMALL; break; @@ -3280,7 +3292,7 @@ arm_smmu_master_build_invs(struct arm_smmu_master *ma= ster, bool ats_enabled, return NULL; =20 /* All the nested S1 ASIDs have to be flushed when S2 parent changes */ - if (nesting) { + if (tag->type =3D=3D INV_TYPE_S2_VMID_VSMMU) { if (!arm_smmu_master_build_inv(master, INV_TYPE_S2_VMID_S1_CLEAR, tag->id, IOMMU_NO_PASID, 0)) --=20 2.43.0