@@ -130,3 +130,14 @@ Enable and configure different types of intercepts. Intercepts are events in a
 guest partition that will suspend the guest vp and send a message to the root
 partition (returned from MSHV_RUN_VP).
 
+3.8 MSHV_ASSERT_INTERRUPT
+--------------------------
+:Type: partition ioctl
+:Parameters: struct mshv_assert_interrupt
+:Returns: 0 on success
+
+Assert interrupts in partitions that use Microsoft Hypervisor's internal
+emulated LAPIC. This must be enabled on partition creation with the flag:
+HV_PARTITION_CREATION_FLAG_LAPIC_ENABLED
+
+

@@ -546,20 +546,6 @@ struct hv_partition_assist_pg {
 	u32 tlb_lock_count;
 };
 
-enum hv_interrupt_type {
-	HV_X64_INTERRUPT_TYPE_FIXED             = 0x0000,
-	HV_X64_INTERRUPT_TYPE_LOWESTPRIORITY    = 0x0001,
-	HV_X64_INTERRUPT_TYPE_SMI               = 0x0002,
-	HV_X64_INTERRUPT_TYPE_REMOTEREAD        = 0x0003,
-	HV_X64_INTERRUPT_TYPE_NMI               = 0x0004,
-	HV_X64_INTERRUPT_TYPE_INIT              = 0x0005,
-	HV_X64_INTERRUPT_TYPE_SIPI              = 0x0006,
-	HV_X64_INTERRUPT_TYPE_EXTINT            = 0x0007,
-	HV_X64_INTERRUPT_TYPE_LOCALINT0         = 0x0008,
-	HV_X64_INTERRUPT_TYPE_LOCALINT1         = 0x0009,
-	HV_X64_INTERRUPT_TYPE_MAXIMUM           = 0x000A,
-};
-
 #include <asm-generic/hyperv-tlfs.h>
 
 #endif

@@ -989,6 +989,28 @@ union hv_intercept_parameters {
 #define HV_INTERCEPT_ACCESS_MASK_WRITE		0x02
 #define HV_INTERCEPT_ACCESS_MASK_EXECUTE	0x04
 
+enum hv_interrupt_type {
+	HV_X64_INTERRUPT_TYPE_FIXED             = 0x0000,
+	HV_X64_INTERRUPT_TYPE_LOWESTPRIORITY    = 0x0001,
+	HV_X64_INTERRUPT_TYPE_SMI               = 0x0002,
+	HV_X64_INTERRUPT_TYPE_REMOTEREAD        = 0x0003,
+	HV_X64_INTERRUPT_TYPE_NMI               = 0x0004,
+	HV_X64_INTERRUPT_TYPE_INIT              = 0x0005,
+	HV_X64_INTERRUPT_TYPE_SIPI              = 0x0006,
+	HV_X64_INTERRUPT_TYPE_EXTINT            = 0x0007,
+	HV_X64_INTERRUPT_TYPE_LOCALINT0         = 0x0008,
+	HV_X64_INTERRUPT_TYPE_LOCALINT1         = 0x0009,
+	HV_X64_INTERRUPT_TYPE_MAXIMUM           = 0x000A
+};
 
+union hv_interrupt_control {
+	struct {
+		__u32 interrupt_type; /* enum hv_interrupt type */
+		__u32 level_triggered : 1;
+		__u32 logical_dest_mode : 1;
+		__u32 rsvd : 30;
+	} __packed;
+	__u64 as_uint64;
+};
 
 #endif

@@ -434,3 +434,32 @@ int hv_call_install_intercept(
 	return ret;
 }
 
+int hv_call_assert_virtual_interrupt(
+		u64 partition_id,
+		u32 vector,
+		u64 dest_addr,
+		union hv_interrupt_control control)
+{
+	struct hv_assert_virtual_interrupt *input;
+	unsigned long flags;
+	u64 status;
+
+	local_irq_save(flags);
+	input = (struct hv_assert_virtual_interrupt *)(*this_cpu_ptr(
+			hyperv_pcpu_input_arg));
+	memset(input, 0, sizeof(*input));
+	input->partition_id = partition_id;
+	input->vector = vector;
+	input->dest_addr = dest_addr;
+	input->control = control;
+	status = hv_do_hypercall(HVCALL_ASSERT_VIRTUAL_INTERRUPT, input, NULL);
+	local_irq_restore(flags);
+
+	if (!hv_result_success(status)) {
+		pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+		return hv_status_to_errno(status);
+	}
+
+	return 0;
+}
+

@@ -67,5 +67,10 @@ int hv_call_set_vp_registers(
 int hv_call_install_intercept(u64 partition_id, u32 access_type,
 		enum hv_intercept_type intercept_type,
 		union hv_intercept_parameters intercept_parameter);
+int hv_call_assert_virtual_interrupt(
+		u64 partition_id,
+		u32 vector,
+		u64 dest_addr,
+		union hv_interrupt_control control);
 
 #endif /* _MSHV_H */

@@ -573,6 +573,22 @@ mshv_partition_ioctl_install_intercept(struct mshv_partition *partition,
 			args.intercept_parameter);
 }
 
+static long
+mshv_partition_ioctl_assert_interrupt(struct mshv_partition *partition,
+				      void __user *user_args)
+{
+	struct mshv_assert_interrupt args;
+
+	if (copy_from_user(&args, user_args, sizeof(args)))
+		return -EFAULT;
+
+	return hv_call_assert_virtual_interrupt(
+			partition->id,
+			args.vector,
+			args.dest_addr,
+			args.control);
+}
+
 static long
 mshv_partition_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 {

@@ -599,6 +615,10 @@ mshv_partition_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		ret = mshv_partition_ioctl_install_intercept(partition,
 							(void __user *)arg);
 		break;
+	case MSHV_ASSERT_INTERRUPT:
+		ret = mshv_partition_ioctl_assert_interrupt(partition,
+							(void __user *)arg);
+		break;
 	default:
 		ret = -ENOTTY;
 	}

@@ -165,6 +165,7 @@ struct ms_hyperv_tsc_page {
 #define HVCALL_MAP_DEVICE_INTERRUPT		0x007c
 #define HVCALL_UNMAP_DEVICE_INTERRUPT		0x007d
 #define HVCALL_RETARGET_INTERRUPT		0x007e
+#define HVCALL_ASSERT_VIRTUAL_INTERRUPT		0x0094
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
 

@@ -821,4 +822,14 @@ struct hv_install_intercept {
 	union hv_intercept_parameters intercept_parameter;
 } __packed;
 
+struct hv_assert_virtual_interrupt {
+	u64 partition_id;
+	union hv_interrupt_control control;
+	u64 dest_addr; /* cpu's apic id */
+	u32 vector;
+	u8 target_vtl;
+	u8 rsvd_z0;
+	u16 rsvd_z1;
+} __packed;
+
 #endif

@@ -47,6 +47,12 @@ struct mshv_install_intercept {
 	union hv_intercept_parameters intercept_parameter;
 };
 
+struct mshv_assert_interrupt {
+	union hv_interrupt_control control;
+	__u64 dest_addr;
+	__u32 vector;
+};
+
 #define MSHV_IOCTL 0xB8
 
 /* mshv device */

@@ -58,6 +64,7 @@ struct mshv_install_intercept {
 #define MSHV_UNMAP_GUEST_MEMORY	_IOW(MSHV_IOCTL, 0x03, struct mshv_user_mem_region)
 #define MSHV_CREATE_VP		_IOW(MSHV_IOCTL, 0x04, struct mshv_create_vp)
 #define MSHV_INSTALL_INTERCEPT	_IOW(MSHV_IOCTL, 0x08, struct mshv_install_intercept)
+#define MSHV_ASSERT_INTERRUPT	_IOW(MSHV_IOCTL, 0x09, struct mshv_assert_interrupt)
 
 /* vp device */
 #define MSHV_GET_VP_REGISTERS   _IOWR(MSHV_IOCTL, 0x05, struct mshv_vp_registers)