[PATCH v4 1/5] hyperv: Introduce new hypercall interfaces used by Hyper-V guest IOMMU

[Yu Zhang <zhangyu1@linux.microsoft.com>]

From: Wei Liu <wei.liu@kernel.org>

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>
---
 drivers/hv/hv_common.c      |   1 +
 include/hyperv/hvgdk_mini.h |   9 +++
 include/hyperv/hvhdk_mini.h | 137 ++++++++++++++++++++++++++++++++++++
 3 files changed, 147 insertions(+)

diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 6b67ac616789..b5d2d6cd65ae 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -810,6 +810,7 @@ static const struct hv_status_info hv_status_infos[] = {
 	_STATUS_INFO(HV_STATUS_INVALID_REGISTER_VALUE,		-EINVAL),
 	_STATUS_INFO(HV_STATUS_INVALID_LP_INDEX,		-EIO),
 	_STATUS_INFO(HV_STATUS_INVALID_REGISTER_VALUE,		-EIO),
+	_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),
diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h
index 6a4e8b9d570f..5d1338197eee 100644
--- a/include/hyperv/hvgdk_mini.h
+++ b/include/hyperv/hvgdk_mini.h
@@ -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 */
diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h
index 035ba20870f7..7b9f43b320cd 100644
--- a/include/hyperv/hvhdk_mini.h
+++ b/include/hyperv/hvhdk_mini.h
@@ -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 */
-- 
2.52.0