On Tue, Dec 9, 2025 at 1:13 PM Yu Zhang <[email protected]> wrote: > > From: Wei Liu <[email protected]> > > Hyper-V guest IOMMU is a para-virtualized IOMMU based on hypercalls. > Introduce the hypercalls used by the child partition to interact with > this facility. > > These hypercalls fall into below categories: > - Detection and capability: HVCALL_GET_IOMMU_CAPABILITIES is used to > detect the existence and capabilities of the guest IOMMU. > > - Device management: HVCALL_GET_LOGICAL_DEVICE_PROPERTY is used to > check whether an endpoint device is managed by the guest IOMMU. > > - Domain management: A set of hypercalls is provided to handle the > creation, configuration, and deletion of guest domains, as well as > the attachment/detachment of endpoint devices to/from those domains. > > - IOTLB flushing: HVCALL_FLUSH_DEVICE_DOMAIN is used to ask Hyper-V > for a domain-selective IOTLB flush(which in its handler may flush > the device TLB as well). Page-selective IOTLB flushes will be offered > by new hypercalls in future patches. > > Signed-off-by: Wei Liu <[email protected]> > Co-developed-by: Jacob Pan <[email protected]> > Signed-off-by: Jacob Pan <[email protected]> > Co-developed-by: Easwar Hariharan <[email protected]> > Signed-off-by: Easwar Hariharan <[email protected]> > Co-developed-by: Yu Zhang <[email protected]> > Signed-off-by: Yu Zhang <[email protected]> > --- > include/hyperv/hvgdk_mini.h | 8 +++ > include/hyperv/hvhdk_mini.h | 123 ++++++++++++++++++++++++++++++++++++ > 2 files changed, 131 insertions(+) > > diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h > index 77abddfc750e..e5b302bbfe14 100644 > --- a/include/hyperv/hvgdk_mini.h > +++ b/include/hyperv/hvgdk_mini.h > @@ -478,10 +478,16 @@ union hv_vp_assist_msr_contents { /* > HV_REGISTER_VP_ASSIST_PAGE */ > #define HVCALL_GET_VP_INDEX_FROM_APIC_ID 0x009a > #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af > #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0 > +#define HVCALL_CREATE_DEVICE_DOMAIN 0x00b1 > +#define HVCALL_ATTACH_DEVICE_DOMAIN 0x00b2 > #define HVCALL_SIGNAL_EVENT_DIRECT 0x00c0 > #define HVCALL_POST_MESSAGE_DIRECT 0x00c1 > #define HVCALL_DISPATCH_VP 0x00c2 > +#define HVCALL_DETACH_DEVICE_DOMAIN 0x00c4 > +#define HVCALL_DELETE_DEVICE_DOMAIN 0x00c5 > #define HVCALL_GET_GPA_PAGES_ACCESS_STATES 0x00c9 > +#define HVCALL_CONFIGURE_DEVICE_DOMAIN 0x00ce > +#define HVCALL_FLUSH_DEVICE_DOMAIN 0x00d0 > #define HVCALL_ACQUIRE_SPARSE_SPA_PAGE_HOST_ACCESS 0x00d7 > #define HVCALL_RELEASE_SPARSE_SPA_PAGE_HOST_ACCESS 0x00d8 > #define HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY 0x00db > @@ -492,6 +498,8 @@ union hv_vp_assist_msr_contents { /* > HV_REGISTER_VP_ASSIST_PAGE */ > #define HVCALL_GET_VP_CPUID_VALUES 0x00f4 > #define HVCALL_MMIO_READ 0x0106 > #define HVCALL_MMIO_WRITE 0x0107 > +#define HVCALL_GET_IOMMU_CAPABILITIES 0x0125 > +#define HVCALL_GET_LOGICAL_DEVICE_PROPERTY 0x0127 > > /* HV_HYPERCALL_INPUT */ > #define HV_HYPERCALL_RESULT_MASK GENMASK_ULL(15, 0) > diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h > index 858f6a3925b3..ba6b91746b13 100644 > --- a/include/hyperv/hvhdk_mini.h > +++ b/include/hyperv/hvhdk_mini.h > @@ -400,4 +400,127 @@ union hv_device_id { /* HV_DEVICE_ID */ > } acpi; > } __packed; > > +/* Device domain types */ > +#define HV_DEVICE_DOMAIN_TYPE_S1 1 /* Stage 1 domain */ > + > +/* ID for default domain and NULL domain */ > +#define HV_DEVICE_DOMAIN_ID_DEFAULT 0 > +#define HV_DEVICE_DOMAIN_ID_NULL 0xFFFFFFFFULL > + > +union hv_device_domain_id { > + u64 as_uint64; > + struct { > + u32 type: 4; > + u32 reserved: 28; > + u32 id; > + } __packed; > +}; > + > +struct hv_input_device_domain { > + u64 partition_id; > + union hv_input_vtl owner_vtl; > + u8 padding[7]; > + union hv_device_domain_id domain_id; > +} __packed; > + > +union hv_create_device_domain_flags { > + u32 as_uint32; > + struct { > + u32 forward_progress_required: 1; > + u32 inherit_owning_vtl: 1; > + u32 reserved: 30; > + } __packed; > +}; > + > +struct hv_input_create_device_domain { > + struct hv_input_device_domain device_domain; > + union hv_create_device_domain_flags create_device_domain_flags; > +} __packed; > + > +struct hv_input_delete_device_domain { > + struct hv_input_device_domain device_domain; > +} __packed; > + > +struct hv_input_attach_device_domain { > + struct hv_input_device_domain device_domain; > + union hv_device_id device_id; > +} __packed; > + > +struct hv_input_detach_device_domain { > + u64 partition_id; > + union hv_device_id device_id; > +} __packed; > + > +struct hv_device_domain_settings { > + struct { > + /* > + * Enable translations. If not enabled, all transaction bypass > + * S1 translations. > + */ > + u64 translation_enabled: 1; > + u64 blocked: 1; > + /* > + * First stage address translation paging mode: > + * 0: 4-level paging (default) > + * 1: 5-level paging > + */ > + u64 first_stage_paging_mode: 1; > + u64 reserved: 61; > + } flags; > + > + /* Address of translation table */ > + u64 page_table_root; > +} __packed; > + > +struct hv_input_configure_device_domain { > + struct hv_input_device_domain device_domain; > + struct hv_device_domain_settings settings; > +} __packed; > + > +struct hv_input_get_iommu_capabilities { > + u64 partition_id; > + u64 reserved; > +} __packed; > + > +struct hv_output_get_iommu_capabilities { > + u32 size; > + u16 reserved; > + u8 max_iova_width; > + u8 max_pasid_width; > + > +#define HV_IOMMU_CAP_PRESENT (1ULL << 0) > +#define HV_IOMMU_CAP_S2 (1ULL << 1) > +#define HV_IOMMU_CAP_S1 (1ULL << 2) > +#define HV_IOMMU_CAP_S1_5LVL (1ULL << 3) > +#define HV_IOMMU_CAP_PASID (1ULL << 4) > +#define HV_IOMMU_CAP_ATS (1ULL << 5) > +#define HV_IOMMU_CAP_PRI (1ULL << 6) > + > + u64 iommu_cap; > + u64 pgsize_bitmap; > +} __packed; > + > +enum hv_logical_device_property_code { > + HV_LOGICAL_DEVICE_PROPERTY_PVIOMMU = 10, > +}; > + > +struct hv_input_get_logical_device_property { > + u64 partition_id; > + u64 logical_device_id; > + enum hv_logical_device_property_code code; > + u32 reserved; > +} __packed; > + > +struct hv_output_get_logical_device_property { > +#define HV_DEVICE_IOMMU_ENABLED (1ULL << 0) > + u64 device_iommu; > + u64 reserved; > +} __packed; > + > +struct hv_input_flush_device_domain { > + struct hv_input_device_domain device_domain; > + u32 flags; > + u32 reserved; > +} __packed; > + > #endif /* _HV_HVHDK_MINI_H */ > -- > 2.49.0 > >
No code uses these definitions in this patch and it's better to merge with Patch 5? -- Thanks Tianyu Lan
