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diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
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+/*
+ *
+ * Copyright (c) 2011, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *   K. Y. Srinivasan <kys@microsoft.com>
+ *
+ */
+
+#ifndef _UAPI_HYPERV_H
+#define _UAPI_HYPERV_H
+
+/*
+ * Framework version for util services.
+ */
+#define UTIL_FW_MINOR  0
+
+#define UTIL_WS2K8_FW_MAJOR  1
+#define UTIL_WS2K8_FW_VERSION     (UTIL_WS2K8_FW_MAJOR << 16 | UTIL_FW_MINOR)
+
+#define UTIL_FW_MAJOR  3
+#define UTIL_FW_VERSION     (UTIL_FW_MAJOR << 16 | UTIL_FW_MINOR)
+
+
+/*
+ * Implementation of host controlled snapshot of the guest.
+ */
+
+#define VSS_OP_REGISTER 128
+
+enum hv_vss_op {
+        VSS_OP_CREATE = 0,
+        VSS_OP_DELETE,
+        VSS_OP_HOT_BACKUP,
+        VSS_OP_GET_DM_INFO,
+        VSS_OP_BU_COMPLETE,
+        /*
+         * Following operations are only supported with IC version >= 5.0
+         */
+        VSS_OP_FREEZE, /* Freeze the file systems in the VM */
+        VSS_OP_THAW, /* Unfreeze the file systems */
+        VSS_OP_AUTO_RECOVER,
+        VSS_OP_COUNT /* Number of operations, must be last */
+};
+
+
+/*
+ * Header for all VSS messages.
+ */
+struct hv_vss_hdr {
+        __u8 operation;
+        __u8 reserved[7];
+} __attribute__((packed));
+
+
+/*
+ * Flag values for the hv_vss_check_feature. Linux supports only
+ * one value.
+ */
+#define VSS_HBU_NO_AUTO_RECOVERY        0x00000005
+
+struct hv_vss_check_feature {
+        __u32 flags;
+} __attribute__((packed));
+
+struct hv_vss_check_dm_info {
+        __u32 flags;
+} __attribute__((packed));
+
+struct hv_vss_msg {
+        union {
+                struct hv_vss_hdr vss_hdr;
+                int error;
+        };
+        union {
+                struct hv_vss_check_feature vss_cf;
+                struct hv_vss_check_dm_info dm_info;
+        };
+} __attribute__((packed));
+
+/*
+ * An implementation of HyperV key value pair (KVP) functionality for Linux.
+ *
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
+ *
+ */
+
+/*
+ * Maximum value size - used for both key names and value data, and includes
+ * any applicable NULL terminators.
+ *
+ * Note:  This limit is somewhat arbitrary, but falls easily within what is
+ * supported for all native guests (back to Win 2000) and what is reasonable
+ * for the IC KVP exchange functionality.  Note that Windows Me/98/95 are
+ * limited to 255 character key names.
+ *
+ * MSDN recommends not storing data values larger than 2048 bytes in the
+ * registry.
+ *
+ * Note:  This value is used in defining the KVP exchange message - this value
+ * cannot be modified without affecting the message size and compatibility.
+ */
+
+/*
+ * bytes, including any null terminators
+ */
+#define HV_KVP_EXCHANGE_MAX_VALUE_SIZE          (2048)
+
+
+/*
+ * Maximum key size - the registry limit for the length of an entry name
+ * is 256 characters, including the null terminator
+ */
+
+#define HV_KVP_EXCHANGE_MAX_KEY_SIZE            (512)
+
+/*
+ * In Linux, we implement the KVP functionality in two components:
+ * 1) The kernel component which is packaged as part of the hv_utils driver
+ * is responsible for communicating with the host and responsible for
+ * implementing the host/guest protocol. 2) A user level daemon that is
+ * responsible for data gathering.
+ *
+ * Host/Guest Protocol: The host iterates over an index and expects the guest
+ * to assign a key name to the index and also return the value corresponding to
+ * the key. The host will have atmost one KVP transaction outstanding at any
+ * given point in time. The host side iteration stops when the guest returns
+ * an error. Microsoft has specified the following mapping of key names to
+ * host specified index:
+ *
+ *      Index           Key Name
+ *      0               FullyQualifiedDomainName
+ *      1               IntegrationServicesVersion
+ *      2               NetworkAddressIPv4
+ *      3               NetworkAddressIPv6
+ *      4               OSBuildNumber
+ *      5               OSName
+ *      6               OSMajorVersion
+ *      7               OSMinorVersion
+ *      8               OSVersion
+ *      9               ProcessorArchitecture
+ *
+ * The Windows host expects the Key Name and Key Value to be encoded in utf16.
+ *
+ * Guest Kernel/KVP Daemon Protocol: As noted earlier, we implement all of the
+ * data gathering functionality in a user mode daemon. The user level daemon
+ * is also responsible for binding the key name to the index as well. The
+ * kernel and user-level daemon communicate using a connector channel.
+ *
+ * The user mode component first registers with the
+ * the kernel component. Subsequently, the kernel component requests, data
+ * for the specified keys. In response to this message the user mode component
+ * fills in the value corresponding to the specified key. We overload the
+ * sequence field in the cn_msg header to define our KVP message types.
+ *
+ *
+ * The kernel component simply acts as a conduit for communication between the
+ * Windows host and the user-level daemon. The kernel component passes up the
+ * index received from the Host to the user-level daemon. If the index is
+ * valid (supported), the corresponding key as well as its
+ * value (both are strings) is returned. If the index is invalid
+ * (not supported), a NULL key string is returned.
+ */
+
+
+/*
+ * Registry value types.
+ */
+
+#define REG_SZ 1
+#define REG_U32 4
+#define REG_U64 8
+
+/*
+ * As we look at expanding the KVP functionality to include
+ * IP injection functionality, we need to maintain binary
+ * compatibility with older daemons.
+ *
+ * The KVP opcodes are defined by the host and it was unfortunate
+ * that I chose to treat the registration operation as part of the
+ * KVP operations defined by the host.
+ * Here is the level of compatibility
+ * (between the user level daemon and the kernel KVP driver) that we
+ * will implement:
+ *
+ * An older daemon will always be supported on a newer driver.
+ * A given user level daemon will require a minimal version of the
+ * kernel driver.
+ * If we cannot handle the version differences, we will fail gracefully
+ * (this can happen when we have a user level daemon that is more
+ * advanced than the KVP driver.
+ *
+ * We will use values used in this handshake for determining if we have
+ * workable user level daemon and the kernel driver. We begin by taking the
+ * registration opcode out of the KVP opcode namespace. We will however,
+ * maintain compatibility with the existing user-level daemon code.
+ */
+
+/*
+ * Daemon code not supporting IP injection (legacy daemon).
+ */
+
+#define KVP_OP_REGISTER 4
+
+/*
+ * Daemon code supporting IP injection.
+ * The KVP opcode field is used to communicate the
+ * registration information; so define a namespace that
+ * will be distinct from the host defined KVP opcode.
+ */
+
+#define KVP_OP_REGISTER1 100
+
+enum hv_kvp_exchg_op {
+        KVP_OP_GET = 0,
+        KVP_OP_SET,
+        KVP_OP_DELETE,
+        KVP_OP_ENUMERATE,
+        KVP_OP_GET_IP_INFO,
+        KVP_OP_SET_IP_INFO,
+        KVP_OP_COUNT /* Number of operations, must be last. */
+};
+
+enum hv_kvp_exchg_pool {
+        KVP_POOL_EXTERNAL = 0,
+        KVP_POOL_GUEST,
+        KVP_POOL_AUTO,
+        KVP_POOL_AUTO_EXTERNAL,
+        KVP_POOL_AUTO_INTERNAL,
+        KVP_POOL_COUNT /* Number of pools, must be last. */
+};
+
+/*
+ * Some Hyper-V status codes.
+ */
+
+#define HV_S_OK                         0x00000000
+#define HV_E_FAIL                       0x80004005
+#define HV_S_CONT                       0x80070103
+#define HV_ERROR_NOT_SUPPORTED          0x80070032
+#define HV_ERROR_MACHINE_LOCKED         0x800704F7
+#define HV_ERROR_DEVICE_NOT_CONNECTED   0x8007048F
+#define HV_INVALIDARG                   0x80070057
+#define HV_GUID_NOTFOUND                0x80041002
+
+#define ADDR_FAMILY_NONE        0x00
+#define ADDR_FAMILY_IPV4        0x01
+#define ADDR_FAMILY_IPV6        0x02
+
+#define MAX_ADAPTER_ID_SIZE     128
+#define MAX_IP_ADDR_SIZE        1024
+#define MAX_GATEWAY_SIZE        512
+
+
+struct hv_kvp_ipaddr_value {
+        __u16   adapter_id[MAX_ADAPTER_ID_SIZE];
+        __u8    addr_family;
+        __u8    dhcp_enabled;
+        __u16   ip_addr[MAX_IP_ADDR_SIZE];
+        __u16   sub_net[MAX_IP_ADDR_SIZE];
+        __u16   gate_way[MAX_GATEWAY_SIZE];
+        __u16   dns_addr[MAX_IP_ADDR_SIZE];
+} __attribute__((packed));
+
+
+struct hv_kvp_hdr {
+        __u8 operation;
+        __u8 pool;
+        __u16 pad;
+} __attribute__((packed));
+
+struct hv_kvp_exchg_msg_value {
+        __u32 value_type;
+        __u32 key_size;
+        __u32 value_size;
+        __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+        union {
+                __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
+                __u32 value_u32;
+                __u64 value_u64;
+        };
+} __attribute__((packed));
+
+struct hv_kvp_msg_enumerate {
+        __u32 index;
+        struct hv_kvp_exchg_msg_value data;
+} __attribute__((packed));
+
+struct hv_kvp_msg_get {
+        struct hv_kvp_exchg_msg_value data;
+};
+
+struct hv_kvp_msg_set {
+        struct hv_kvp_exchg_msg_value data;
+};
+
+struct hv_kvp_msg_delete {
+        __u32 key_size;
+        __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+};
+
+struct hv_kvp_register {
+        __u8 version[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+};
+
+struct hv_kvp_msg {
+        union {
+                struct hv_kvp_hdr       kvp_hdr;
+                int error;
+        };
+        union {
+                struct hv_kvp_msg_get           kvp_get;
+                struct hv_kvp_msg_set           kvp_set;
+                struct hv_kvp_msg_delete        kvp_delete;
+                struct hv_kvp_msg_enumerate     kvp_enum_data;
+                struct hv_kvp_ipaddr_value      kvp_ip_val;
+                struct hv_kvp_register          kvp_register;
+        } body;
+} __attribute__((packed));
+
+struct hv_kvp_ip_msg {
+        __u8 operation;
+        __u8 pool;
+        struct hv_kvp_ipaddr_value      kvp_ip_val;
+} __attribute__((packed));
+
+#endif /* _UAPI_HYPERV_H */