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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jan 2026 01:24:52.7215 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 486c61cc-5836-46cb-0ca9-08de59550b38 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: MN0PR12MB6248 Content-Type: text/plain; charset="utf-8" When a device attaches to a nested domain, VMID is held by its associated vSMMU instance. So arm_smmu_domain_get_iotlb_tag() should return the VMID from the vSMMU instance rather than allocating a new one. Pass in a vsmmu pointer to arm_smmu_domain_get_iotlb_tag(), to prepare for this. Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 9 +++++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 1 + drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 4 ++-- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 +++++-- 4 files changed, 17 insertions(+), 4 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 8aecdbceb974..386ac75879c0 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -1124,6 +1124,7 @@ struct arm_smmu_attach_state { /* Inputs */ struct iommu_domain *old_domain; struct arm_smmu_master *master; + struct arm_vsmmu *vsmmu; bool cd_needs_ats; bool disable_ats; ioasid_t ssid; @@ -1136,6 +1137,7 @@ struct arm_smmu_attach_state { =20 int arm_smmu_domain_get_iotlb_tag(struct arm_smmu_domain *smmu_domain, struct arm_smmu_device *smmu, + struct arm_vsmmu *vsmmu, struct arm_smmu_inv *tag, bool alloc); =20 int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state, @@ -1182,6 +1184,13 @@ struct arm_vsmmu { u16 vmid; }; =20 +static inline struct arm_vsmmu *to_vsmmu(struct iommu_domain *domain) +{ + if (domain->type =3D=3D IOMMU_DOMAIN_NESTED) + return to_smmu_nested_domain(domain)->vsmmu; + return NULL; +} + #if IS_ENABLED(CONFIG_ARM_SMMU_V3_IOMMUFD) void *arm_smmu_hw_info(struct device *dev, u32 *length, enum iommu_hw_info_type *type); diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/= iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c index 9998871f69a0..33b336d494c3 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c @@ -162,6 +162,7 @@ static int arm_smmu_attach_dev_nested(struct iommu_doma= in *domain, struct arm_smmu_master *master =3D dev_iommu_priv_get(dev); struct arm_smmu_attach_state state =3D { .master =3D master, + .vsmmu =3D nested_domain->vsmmu, .old_domain =3D old_domain, .ssid =3D IOMMU_NO_PASID, }; diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iomm= u/arm/arm-smmu-v3/arm-smmu-v3-sva.c index 5c8960d31a9b..461ccf4bdb03 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c @@ -31,7 +31,7 @@ arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain= *smmu_domain) continue; =20 if (WARN_ON(arm_smmu_domain_get_iotlb_tag( - smmu_domain, master->smmu, &tag, false))) + smmu_domain, master->smmu, NULL, &tag, false))) continue; if (WARN_ON(tag.type !=3D INV_TYPE_S1_ASID)) continue; @@ -171,7 +171,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn= , struct mm_struct *mm) continue; =20 if (WARN_ON(arm_smmu_domain_get_iotlb_tag( - smmu_domain, master->smmu, &tag, false))) + smmu_domain, master->smmu, NULL, &tag, false))) continue; if (WARN_ON(tag.type !=3D INV_TYPE_S1_ASID)) continue; 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 5a7032081553..8323f74c8923 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3137,6 +3137,7 @@ static int __arm_smmu_domain_get_iotlb_tag(struct arm= _smmu_domain *smmu_domain, =20 int arm_smmu_domain_get_iotlb_tag(struct arm_smmu_domain *smmu_domain, struct arm_smmu_device *smmu, + struct arm_vsmmu *vsmmu, struct arm_smmu_inv *tag, bool alloc) { int ret; @@ -3360,6 +3361,7 @@ static int arm_smmu_attach_prepare_invs(struct arm_sm= mu_attach_state *state, */ if (new_smmu_domain) { struct arm_smmu_inv_state *invst =3D &state->new_domain_invst; + struct arm_vsmmu *vsmmu =3D state->vsmmu; struct arm_smmu_invs *build_invs; =20 invst->invs_ptr =3D &new_smmu_domain->invs; @@ -3368,7 +3370,7 @@ static int arm_smmu_attach_prepare_invs(struct arm_sm= mu_attach_state *state, lockdep_is_held(&arm_smmu_asid_lock)); =20 ret =3D arm_smmu_domain_get_iotlb_tag(new_smmu_domain, smmu, - &invst->tag, true); + vsmmu, &invst->tag, true); if (ret) return ret; =20 @@ -3387,6 +3389,7 @@ static int arm_smmu_attach_prepare_invs(struct arm_sm= mu_attach_state *state, =20 if (old_smmu_domain) { struct arm_smmu_inv_state *invst =3D &state->old_domain_invst; + struct arm_vsmmu *vsmmu =3D to_vsmmu(state->old_domain); =20 invst->invs_ptr =3D &old_smmu_domain->invs; /* A re-attach case might have a different ats_enabled state */ @@ -3398,7 +3401,7 @@ static int arm_smmu_attach_prepare_invs(struct arm_sm= mu_attach_state *state, lockdep_is_held(&arm_smmu_asid_lock)); =20 ret =3D arm_smmu_domain_get_iotlb_tag(old_smmu_domain, smmu, - &invst->tag, false); + vsmmu, &invst->tag, false); if (WARN_ON(ret)) return ret; =20 --=20 2.43.0