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hyperv: Introduce new hypercall interfaces used by Hyper-V guest IOMMU

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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).

Signed-off-by: Wei Liu <wei.liu@kernel.org>
Co-developed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
Co-developed-by: Yu Zhang <zhangyu1@linux.microsoft.com>
Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com>
Reviewed-by: Jacob Pan <jacob.pan@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Wei Liu 2026-09-30 22:14:05 +08:00 committed by Joerg Roedel
parent 93f51579e7
commit 1d87b20d1c
3 changed files with 147 additions and 0 deletions
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1
drivers/hv/hv_common.c
View File

@ -808,6 +808,7 @@ static const struct hv_status_info hv_status_infos[] = {
_STATUS_INFO(HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED, -EOPNOTSUPP),
_STATUS_INFO(HV_STATUS_INVALID_LP_INDEX, -EINVAL),
_STATUS_INFO(HV_STATUS_INVALID_REGISTER_VALUE, -EINVAL),
_STATUS_INFO(HV_STATUS_DEVICE_ALREADY_IN_DOMAIN, -EEXIST),
_STATUS_INFO(HV_STATUS_OPERATION_FAILED, -EIO),
_STATUS_INFO(HV_STATUS_TIME_OUT, -EIO),
_STATUS_INFO(HV_STATUS_CALL_PENDING, -EIO),

9
include/hyperv/hvgdk_mini.h
View File

@ -37,6 +37,7 @@ struct hv_u128 {
#define HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED 0x20
#define HV_STATUS_INVALID_LP_INDEX 0x41
#define HV_STATUS_INVALID_REGISTER_VALUE 0x50
#define HV_STATUS_DEVICE_ALREADY_IN_DOMAIN 0x66
#define HV_STATUS_OPERATION_FAILED 0x71
#define HV_STATUS_INSUFFICIENT_ROOT_MEMORY 0x73
#define HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY 0x75
@ -486,10 +487,16 @@ 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
@ -502,6 +509,8 @@ union hv_vp_assist_msr_contents { /* HV_REGISTER_VP_ASSIST_PAGE */
#define HVCALL_MMIO_READ 0x0106
#define HVCALL_MMIO_WRITE 0x0107
#define HVCALL_DISABLE_HYP_EX 0x010f
#define HVCALL_GET_IOMMU_CAPABILITIES 0x0125
#define HVCALL_GET_LOGICAL_DEVICE_PROPERTY 0x0127
#define HVCALL_MAP_STATS_PAGE2 0x0131
/* HV_HYPERCALL_INPUT */

137
include/hyperv/hvhdk_mini.h
View File

@ -548,4 +548,141 @@ union hv_device_id { /* HV_DEVICE_ID */
} acpi;
} __packed;
/* Device domain types */
#define HV_DEVICE_DOMAIN_TYPE_S1 1 /* HV_DEVICE_DOMAIN_ID_TYPE_S1 */
/* 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 { /* HV_DEVICE_DOMAIN_ID */
u64 as_uint64;
struct {
u32 type: 4;
u32 reserved: 28;
u32 id;
} __packed;
};
struct hv_input_device_domain { /* HV_INPUT_DEVICE_DOMAIN */
u64 partition_id;
union hv_input_vtl owner_vtl;
u8 padding[7];
union hv_device_domain_id domain_id;
} __packed;
/* HV_CREATE_DEVICE_DOMAIN_FLAGS */
union hv_create_device_domain_flags {
u32 as_uint32;
struct {
u32 forward_progress_required: 1;
u32 inherit_owning_vtl: 1;
u32 reserved: 30;
} __packed;
};
/* HV_INPUT_CREATE_DEVICE_DOMAIN */
struct hv_input_create_device_domain {
struct hv_input_device_domain device_domain;
union hv_create_device_domain_flags create_device_domain_flags;
u32 padding;
} __packed;
/* HV_INPUT_DELETE_DEVICE_DOMAIN */
struct hv_input_delete_device_domain {
struct hv_input_device_domain device_domain;
} __packed;
/* HV_INPUT_ATTACH_DEVICE_DOMAIN */
struct hv_input_attach_device_domain {
struct hv_input_device_domain device_domain;
union hv_device_id device_id;
} __packed;
/* HV_INPUT_DETACH_DEVICE_DOMAIN */
struct hv_input_detach_device_domain {
u64 partition_id;
union hv_device_id device_id;
} __packed;
struct hv_device_domain_settings { /* 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;
/* HV_INPUT_CONFIGURE_DEVICE_DOMAIN */
struct hv_input_configure_device_domain {
struct hv_input_device_domain device_domain;
struct hv_device_domain_settings settings;
} __packed;
/* HV_INPUT_GET_IOMMU_CAPABILITIES */
struct hv_input_get_iommu_capabilities {
u64 partition_id;
u64 reserved;
} __packed;
/* HV_OUTPUT_GET_IOMMU_CAPABILITIES */
struct hv_output_get_iommu_capabilities {
u32 size;
u16 reserved;
u8 max_iova_width;
u8 max_pasid_width;
#define HV_IOMMU_CAP_PRESENT BIT_ULL(0)
#define HV_IOMMU_CAP_S2 BIT_ULL(1)
#define HV_IOMMU_CAP_S1 BIT_ULL(2)
#define HV_IOMMU_CAP_S1_5LVL BIT_ULL(3)
#define HV_IOMMU_CAP_PASID BIT_ULL(4)
#define HV_IOMMU_CAP_ATS BIT_ULL(5)
#define HV_IOMMU_CAP_PRI BIT_ULL(6)
u64 iommu_cap;
u64 pgsize_bitmap;
} __packed;
/* HV_LOGICAL_DEVICE_PROPERTY_CODE */
enum hv_logical_device_property_code {
HV_LOGICAL_DEVICE_PROPERTY_PVIOMMU = 10,
};
/* HV_INPUT_GET_LOGICAL_DEVICE_PROPERTY */
struct hv_input_get_logical_device_property {
u64 partition_id;
u64 logical_device_id;
/* Takes values from enum hv_logical_device_property_code. */
u32 code;
u32 reserved;
} __packed;
/* HV_OUTPUT_GET_LOGICAL_DEVICE_PROPERTY */
struct hv_output_get_logical_device_property {
#define HV_DEVICE_IOMMU_ENABLED BIT_ULL(0)
u64 device_iommu;
u64 reserved;
} __packed;
/* HV_INPUT_FLUSH_DEVICE_DOMAIN */
struct hv_input_flush_device_domain {
struct hv_input_device_domain device_domain;
u32 flags;
u32 reserved;
} __packed;
#endif /* _HV_HVHDK_MINI_H */