@@ -2901,3 +2901,5 @@ source "drivers/firmware/Kconfig"
 source "arch/x86/kvm/Kconfig"
 
 source "arch/x86/Kconfig.assembler"
+
+source "arch/x86/hyperv/Kconfig"

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# HYPERV_ROOT_API configuration
+#
+
+config HYPERV_ROOT_API
+	tristate "Microsoft Hypervisor root partition interfaces: /dev/mshv"
+	depends on HYPERV
+	help
+	  Provides access to interfaces for managing guest virtual machines
+	  running under the Microsoft Hypervisor.
+
+	  These interfaces will only work when Linux is running as root
+	  partition on the Microsoft Hypervisor.
+
+	  The interfaces are provided via a device named /dev/mshv.
+
+	  To compile this as a module, choose M here: the module
+	  will be called mshv.
+
+	  If unsure, say N.
+

@@ -5,3 +5,7 @@ obj-$(CONFIG_X86_64)	+= hv_apic.o hv_proc.o irqdomain.o
 ifdef CONFIG_X86_64
 obj-$(CONFIG_PARAVIRT_SPINLOCKS)	+= hv_spinlock.o
 endif
+
+MSHV := ../../../virt/mshv
+mshv-y                          += $(MSHV)/mshv_main.o
+obj-$(CONFIG_HYPERV_ROOT_API)   += mshv.o

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020, Microsoft Corporation.
+ *
+ * Authors:
+ *   Nuno Das Neves <nudasnev@microsoft.com>
+ *   Lillian Grassin-Drake <ligrassi@microsoft.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+
+MODULE_AUTHOR("Microsoft");
+MODULE_LICENSE("GPL");
+
+static long
+mshv_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
+{
+	return -ENOTTY;
+}
+
+static int
+mshv_dev_open(struct inode *inode, struct file *filp)
+{
+	return 0;
+}
+
+static int
+mshv_dev_release(struct inode *inode, struct file *filp)
+{
+	return 0;
+}
+
+static const struct file_operations mshv_dev_fops = {
+	.owner = THIS_MODULE,
+	.open = mshv_dev_open,
+	.release = mshv_dev_release,
+	.unlocked_ioctl = mshv_dev_ioctl,
+	.llseek = noop_llseek,
+};
+
+static struct miscdevice mshv_dev = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = "mshv",
+	.fops = &mshv_dev_fops,
+	.mode = 600,
+};
+
+static int
+__init mshv_init(void)
+{
+	int r;
+
+	r = misc_register(&mshv_dev);
+	if (r)
+		pr_err("%s: misc device register failed\n", __func__);
+
+	return r;
+}
+
+static void
+__exit mshv_exit(void)
+{
+	misc_deregister(&mshv_dev);
+}
+
+module_init(mshv_init);
+module_exit(mshv_exit);