From: KY Srinivasan <kys@microsoft.com>
To: Bjarke Istrup Pedersen <gurligebis@gentoo.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC: Haiyang Zhang <haiyangz@microsoft.com>,
        Hank Janssen <hjanssen@microsoft.com>
Subject: RE: [PATCH] Adding hyperv.h to uapi headers
Thread-Topic: [PATCH] Adding hyperv.h to uapi headers
Thread-Index: AQHPFI6m4sNPqYfY4Uy6dSQbN/gct5qLexDg
Date: Sun, 19 Jan 2014 04:55:08 +0000
Message-ID: <47605b493c0443b495a091110f116bbc@BY2PR03MB299.namprd03.prod.outlook.com>
References: <1390078081-26030-1-git-send-email-gurligebis@gentoo.org>
In-Reply-To: <1390078081-26030-1-git-send-email-gurligebis@gentoo.org>
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> -----Original Message-----
> From: Bjarke Istrup Pedersen [mailto:gurligebis@gmail.com] On Behalf Of Bjarke
> Istrup Pedersen
> Sent: Saturday, January 18, 2014 12:48 PM
> To: linux-kernel@vger.kernel.org
> Cc: Haiyang Zhang; Hank Janssen; KY Srinivasan; Bjarke Istrup Pedersen
> Subject: [PATCH] Adding hyperv.h to uapi headers
> 
> This patch adds the hyperv.h header to the uapi folder, and adds it to the Kbuild
> file.
> Doing this enables compiling userspace Hyper-V tools using the installed headers.
> 

Not all of the contents hyperv.h is needed for users-space programs.

I would not ack this patch.

K. Y
> Signed-off-by: Bjarke Istrup Pedersen <gurligebis@gentoo.org>
> ---
>  include/uapi/linux/Kbuild   |    1 +
>  include/uapi/linux/hyperv.h | 1469
> +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 1470 insertions(+)
>  create mode 100644 include/uapi/linux/hyperv.h
> 
> diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
> index 33d2b8f..6389736 100644
> --- a/include/uapi/linux/Kbuild
> +++ b/include/uapi/linux/Kbuild
> @@ -139,6 +139,7 @@ header-y += hid.h
>  header-y += hiddev.h
>  header-y += hidraw.h
>  header-y += hpet.h
> +header-y += hyperv.h
>  header-y += hysdn_if.h
>  header-y += i2c-dev.h
>  header-y += i2c.h
> diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
> new file mode 100644
> index 0000000..15da677
> --- /dev/null
> +++ b/include/uapi/linux/hyperv.h
> @@ -0,0 +1,1469 @@
> +/*
> + *
> + * 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 _HYPERV_H
> +#define _HYPERV_H
> +
> +#include <linux/types.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));
> +
> +#ifdef __KERNEL__
> +#include <linux/scatterlist.h>
> +#include <linux/list.h>
> +#include <linux/uuid.h>
> +#include <linux/timer.h>
> +#include <linux/workqueue.h>
> +#include <linux/completion.h>
> +#include <linux/device.h>
> +#include <linux/mod_devicetable.h>
> +
> +
> +#define MAX_PAGE_BUFFER_COUNT				19
> +#define MAX_MULTIPAGE_BUFFER_COUNT			32 /* 128K */
> +
> +#pragma pack(push, 1)
> +
> +/* Single-page buffer */
> +struct hv_page_buffer {
> +	u32 len;
> +	u32 offset;
> +	u64 pfn;
> +};
> +
> +/* Multiple-page buffer */
> +struct hv_multipage_buffer {
> +	/* Length and Offset determines the # of pfns in the array */
> +	u32 len;
> +	u32 offset;
> +	u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
> +};
> +
> +/* 0x18 includes the proprietary packet header */
> +#define MAX_PAGE_BUFFER_PACKET		(0x18 +			\
> +					(sizeof(struct hv_page_buffer) * \
> +					 MAX_PAGE_BUFFER_COUNT))
> +#define MAX_MULTIPAGE_BUFFER_PACKET	(0x18 +			\
> +					 sizeof(struct hv_multipage_buffer))
> +
> +
> +#pragma pack(pop)
> +
> +struct hv_ring_buffer {
> +	/* Offset in bytes from the start of ring data below */
> +	u32 write_index;
> +
> +	/* Offset in bytes from the start of ring data below */
> +	u32 read_index;
> +
> +	u32 interrupt_mask;
> +
> +	/*
> +	 * Win8 uses some of the reserved bits to implement
> +	 * interrupt driven flow management. On the send side
> +	 * we can request that the receiver interrupt the sender
> +	 * when the ring transitions from being full to being able
> +	 * to handle a message of size "pending_send_sz".
> +	 *
> +	 * Add necessary state for this enhancement.
> +	 */
> +	u32 pending_send_sz;
> +
> +	u32 reserved1[12];
> +
> +	union {
> +		struct {
> +			u32 feat_pending_send_sz:1;
> +		};
> +		u32 value;
> +	} feature_bits;
> +
> +	/* Pad it to PAGE_SIZE so that data starts on page boundary */
> +	u8	reserved2[4028];
> +
> +	/*
> +	 * Ring data starts here + RingDataStartOffset
> +	 * !!! DO NOT place any fields below this !!!
> +	 */
> +	u8 buffer[0];
> +} __packed;
> +
> +struct hv_ring_buffer_info {
> +	struct hv_ring_buffer *ring_buffer;
> +	u32 ring_size;			/* Include the shared header */
> +	spinlock_t ring_lock;
> +
> +	u32 ring_datasize;		/* < ring_size */
> +	u32 ring_data_startoffset;
> +};
> +
> +/*
> + *
> + * hv_get_ringbuffer_availbytes()
> + *
> + * Get number of bytes available to read and to write to
> + * for the specified ring buffer
> + */
> +static inline void
> +hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
> +			  u32 *read, u32 *write)
> +{
> +	u32 read_loc, write_loc, dsize;
> +
> +	smp_read_barrier_depends();
> +
> +	/* Capture the read/write indices before they changed */
> +	read_loc = rbi->ring_buffer->read_index;
> +	write_loc = rbi->ring_buffer->write_index;
> +	dsize = rbi->ring_datasize;
> +
> +	*write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
> +		read_loc - write_loc;
> +	*read = dsize - *write;
> +}
> +
> +/*
> + * VMBUS version is 32 bit entity broken up into
> + * two 16 bit quantities: major_number. minor_number.
> + *
> + * 0 . 13 (Windows Server 2008)
> + * 1 . 1  (Windows 7)
> + * 2 . 4  (Windows 8)
> + */
> +
> +#define VERSION_WS2008  ((0 << 16) | (13))
> +#define VERSION_WIN7    ((1 << 16) | (1))
> +#define VERSION_WIN8    ((2 << 16) | (4))
> +
> +#define VERSION_INVAL -1
> +
> +#define VERSION_CURRENT VERSION_WIN8
> +
> +/* Make maximum size of pipe payload of 16K */
> +#define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)
> +
> +/* Define PipeMode values. */
> +#define VMBUS_PIPE_TYPE_BYTE		0x00000000
> +#define VMBUS_PIPE_TYPE_MESSAGE		0x00000004
> +
> +/* The size of the user defined data buffer for non-pipe offers. */
> +#define MAX_USER_DEFINED_BYTES		120
> +
> +/* The size of the user defined data buffer for pipe offers. */
> +#define MAX_PIPE_USER_DEFINED_BYTES	116
> +
> +/*
> + * At the center of the Channel Management library is the Channel Offer. This
> + * struct contains the fundamental information about an offer.
> + */
> +struct vmbus_channel_offer {
> +	uuid_le if_type;
> +	uuid_le if_instance;
> +
> +	/*
> +	 * These two fields are not currently used.
> +	 */
> +	u64 reserved1;
> +	u64 reserved2;
> +
> +	u16 chn_flags;
> +	u16 mmio_megabytes;		/* in bytes * 1024 * 1024 */
> +
> +	union {
> +		/* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes.
> */
> +		struct {
> +			unsigned char user_def[MAX_USER_DEFINED_BYTES];
> +		} std;
> +
> +		/*
> +		 * Pipes:
> +		 * The following sructure is an integrated pipe protocol, which
> +		 * is implemented on top of standard user-defined data. Pipe
> +		 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their
> own
> +		 * use.
> +		 */
> +		struct {
> +			u32  pipe_mode;
> +			unsigned char
> user_def[MAX_PIPE_USER_DEFINED_BYTES];
> +		} pipe;
> +	} u;
> +	/*
> +	 * The sub_channel_index is defined in win8.
> +	 */
> +	u16 sub_channel_index;
> +	u16 reserved3;
> +} __packed;
> +
> +/* Server Flags */
> +#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE	1
> +#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES	2
> +#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS		4
> +#define VMBUS_CHANNEL_NAMED_PIPE_MODE			0x10
> +#define VMBUS_CHANNEL_LOOPBACK_OFFER			0x100
> +#define VMBUS_CHANNEL_PARENT_OFFER			0x200
> +#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION	0x400
> +
> +struct vmpacket_descriptor {
> +	u16 type;
> +	u16 offset8;
> +	u16 len8;
> +	u16 flags;
> +	u64 trans_id;
> +} __packed;
> +
> +struct vmpacket_header {
> +	u32 prev_pkt_start_offset;
> +	struct vmpacket_descriptor descriptor;
> +} __packed;
> +
> +struct vmtransfer_page_range {
> +	u32 byte_count;
> +	u32 byte_offset;
> +} __packed;
> +
> +struct vmtransfer_page_packet_header {
> +	struct vmpacket_descriptor d;
> +	u16 xfer_pageset_id;
> +	u8  sender_owns_set;
> +	u8 reserved;
> +	u32 range_cnt;
> +	struct vmtransfer_page_range ranges[1];
> +} __packed;
> +
> +struct vmgpadl_packet_header {
> +	struct vmpacket_descriptor d;
> +	u32 gpadl;
> +	u32 reserved;
> +} __packed;
> +
> +struct vmadd_remove_transfer_page_set {
> +	struct vmpacket_descriptor d;
> +	u32 gpadl;
> +	u16 xfer_pageset_id;
> +	u16 reserved;
> +} __packed;
> +
> +/*
> + * This structure defines a range in guest physical space that can be made to
> + * look virtually contiguous.
> + */
> +struct gpa_range {
> +	u32 byte_count;
> +	u32 byte_offset;
> +	u64 pfn_array[0];
> +};
> +
> +/*
> + * This is the format for an Establish Gpadl packet, which contains a handle by
> + * which this GPADL will be known and a set of GPA ranges associated with it.
> + * This can be converted to a MDL by the guest OS.  If there are multiple GPA
> + * ranges, then the resulting MDL will be "chained," representing multiple VA
> + * ranges.
> + */
> +struct vmestablish_gpadl {
> +	struct vmpacket_descriptor d;
> +	u32 gpadl;
> +	u32 range_cnt;
> +	struct gpa_range range[1];
> +} __packed;
> +
> +/*
> + * This is the format for a Teardown Gpadl packet, which indicates that the
> + * GPADL handle in the Establish Gpadl packet will never be referenced again.
> + */
> +struct vmteardown_gpadl {
> +	struct vmpacket_descriptor d;
> +	u32 gpadl;
> +	u32 reserved;	/* for alignment to a 8-byte boundary */
> +} __packed;
> +
> +/*
> + * This is the format for a GPA-Direct packet, which contains a set of GPA
> + * ranges, in addition to commands and/or data.
> + */
> +struct vmdata_gpa_direct {
> +	struct vmpacket_descriptor d;
> +	u32 reserved;
> +	u32 range_cnt;
> +	struct gpa_range range[1];
> +} __packed;
> +
> +/* This is the format for a Additional Data Packet. */
> +struct vmadditional_data {
> +	struct vmpacket_descriptor d;
> +	u64 total_bytes;
> +	u32 offset;
> +	u32 byte_cnt;
> +	unsigned char data[1];
> +} __packed;
> +
> +union vmpacket_largest_possible_header {
> +	struct vmpacket_descriptor simple_hdr;
> +	struct vmtransfer_page_packet_header xfer_page_hdr;
> +	struct vmgpadl_packet_header gpadl_hdr;
> +	struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
> +	struct vmestablish_gpadl establish_gpadl_hdr;
> +	struct vmteardown_gpadl teardown_gpadl_hdr;
> +	struct vmdata_gpa_direct data_gpa_direct_hdr;
> +};
> +
> +#define VMPACKET_DATA_START_ADDRESS(__packet)	\
> +	(void *)(((unsigned char *)__packet) +	\
> +	 ((struct vmpacket_descriptor)__packet)->offset8 * 8)
> +
> +#define VMPACKET_DATA_LENGTH(__packet)		\
> +	((((struct vmpacket_descriptor)__packet)->len8 -	\
> +	  ((struct vmpacket_descriptor)__packet)->offset8) * 8)
> +
> +#define VMPACKET_TRANSFER_MODE(__packet)	\
> +	(((struct IMPACT)__packet)->type)
> +
> +enum vmbus_packet_type {
> +	VM_PKT_INVALID				= 0x0,
> +	VM_PKT_SYNCH				= 0x1,
> +	VM_PKT_ADD_XFER_PAGESET			= 0x2,
> +	VM_PKT_RM_XFER_PAGESET			= 0x3,
> +	VM_PKT_ESTABLISH_GPADL			= 0x4,
> +	VM_PKT_TEARDOWN_GPADL			= 0x5,
> +	VM_PKT_DATA_INBAND			= 0x6,
> +	VM_PKT_DATA_USING_XFER_PAGES		= 0x7,
> +	VM_PKT_DATA_USING_GPADL			= 0x8,
> +	VM_PKT_DATA_USING_GPA_DIRECT		= 0x9,
> +	VM_PKT_CANCEL_REQUEST			= 0xa,
> +	VM_PKT_COMP				= 0xb,
> +	VM_PKT_DATA_USING_ADDITIONAL_PKT	= 0xc,
> +	VM_PKT_ADDITIONAL_DATA			= 0xd
> +};
> +
> +#define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED	1
> +
> +
> +/* Version 1 messages */
> +enum vmbus_channel_message_type {
> +	CHANNELMSG_INVALID			=  0,
> +	CHANNELMSG_OFFERCHANNEL		=  1,
> +	CHANNELMSG_RESCIND_CHANNELOFFER	=  2,
> +	CHANNELMSG_REQUESTOFFERS		=  3,
> +	CHANNELMSG_ALLOFFERS_DELIVERED	=  4,
> +	CHANNELMSG_OPENCHANNEL		=  5,
> +	CHANNELMSG_OPENCHANNEL_RESULT		=  6,
> +	CHANNELMSG_CLOSECHANNEL		=  7,
> +	CHANNELMSG_GPADL_HEADER		=  8,
> +	CHANNELMSG_GPADL_BODY			=  9,
> +	CHANNELMSG_GPADL_CREATED		= 10,
> +	CHANNELMSG_GPADL_TEARDOWN		= 11,
> +	CHANNELMSG_GPADL_TORNDOWN		= 12,
> +	CHANNELMSG_RELID_RELEASED		= 13,
> +	CHANNELMSG_INITIATE_CONTACT		= 14,
> +	CHANNELMSG_VERSION_RESPONSE		= 15,
> +	CHANNELMSG_UNLOAD			= 16,
> +#ifdef
> VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
> +	CHANNELMSG_VIEWRANGE_ADD		= 17,
> +	CHANNELMSG_VIEWRANGE_REMOVE		= 18,
> +#endif
> +	CHANNELMSG_COUNT
> +};
> +
> +struct vmbus_channel_message_header {
> +	enum vmbus_channel_message_type msgtype;
> +	u32 padding;
> +} __packed;
> +
> +/* Query VMBus Version parameters */
> +struct vmbus_channel_query_vmbus_version {
> +	struct vmbus_channel_message_header header;
> +	u32 version;
> +} __packed;
> +
> +/* VMBus Version Supported parameters */
> +struct vmbus_channel_version_supported {
> +	struct vmbus_channel_message_header header;
> +	u8 version_supported;
> +} __packed;
> +
> +/* Offer Channel parameters */
> +struct vmbus_channel_offer_channel {
> +	struct vmbus_channel_message_header header;
> +	struct vmbus_channel_offer offer;
> +	u32 child_relid;
> +	u8 monitorid;
> +	/*
> +	 * win7 and beyond splits this field into a bit field.
> +	 */
> +	u8 monitor_allocated:1;
> +	u8 reserved:7;
> +	/*
> +	 * These are new fields added in win7 and later.
> +	 * Do not access these fields without checking the
> +	 * negotiated protocol.
> +	 *
> +	 * If "is_dedicated_interrupt" is set, we must not set the
> +	 * associated bit in the channel bitmap while sending the
> +	 * interrupt to the host.
> +	 *
> +	 * connection_id is to be used in signaling the host.
> +	 */
> +	u16 is_dedicated_interrupt:1;
> +	u16 reserved1:15;
> +	u32 connection_id;
> +} __packed;
> +
> +/* Rescind Offer parameters */
> +struct vmbus_channel_rescind_offer {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +} __packed;
> +
> +/*
> + * Request Offer -- no parameters, SynIC message contains the partition ID
> + * Set Snoop -- no parameters, SynIC message contains the partition ID
> + * Clear Snoop -- no parameters, SynIC message contains the partition ID
> + * All Offers Delivered -- no parameters, SynIC message contains the partition
> + *		           ID
> + * Flush Client -- no parameters, SynIC message contains the partition ID
> + */
> +
> +/* Open Channel parameters */
> +struct vmbus_channel_open_channel {
> +	struct vmbus_channel_message_header header;
> +
> +	/* Identifies the specific VMBus channel that is being opened. */
> +	u32 child_relid;
> +
> +	/* ID making a particular open request at a channel offer unique. */
> +	u32 openid;
> +
> +	/* GPADL for the channel's ring buffer. */
> +	u32 ringbuffer_gpadlhandle;
> +
> +	/*
> +	 * Starting with win8, this field will be used to specify
> +	 * the target virtual processor on which to deliver the interrupt for
> +	 * the host to guest communication.
> +	 * Prior to win8, incoming channel interrupts would only
> +	 * be delivered on cpu 0. Setting this value to 0 would
> +	 * preserve the earlier behavior.
> +	 */
> +	u32 target_vp;
> +
> +	/*
> +	* The upstream ring buffer begins at offset zero in the memory
> +	* described by RingBufferGpadlHandle. The downstream ring buffer
> +	* follows it at this offset (in pages).
> +	*/
> +	u32 downstream_ringbuffer_pageoffset;
> +
> +	/* User-specific data to be passed along to the server endpoint. */
> +	unsigned char userdata[MAX_USER_DEFINED_BYTES];
> +} __packed;
> +
> +/* Open Channel Result parameters */
> +struct vmbus_channel_open_result {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +	u32 openid;
> +	u32 status;
> +} __packed;
> +
> +/* Close channel parameters; */
> +struct vmbus_channel_close_channel {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +} __packed;
> +
> +/* Channel Message GPADL */
> +#define GPADL_TYPE_RING_BUFFER		1
> +#define GPADL_TYPE_SERVER_SAVE_AREA	2
> +#define GPADL_TYPE_TRANSACTION		8
> +
> +/*
> + * The number of PFNs in a GPADL message is defined by the number of
> + * pages that would be spanned by ByteCount and ByteOffset.  If the
> + * implied number of PFNs won't fit in this packet, there will be a
> + * follow-up packet that contains more.
> + */
> +struct vmbus_channel_gpadl_header {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +	u32 gpadl;
> +	u16 range_buflen;
> +	u16 rangecount;
> +	struct gpa_range range[0];
> +} __packed;
> +
> +/* This is the followup packet that contains more PFNs. */
> +struct vmbus_channel_gpadl_body {
> +	struct vmbus_channel_message_header header;
> +	u32 msgnumber;
> +	u32 gpadl;
> +	u64 pfn[0];
> +} __packed;
> +
> +struct vmbus_channel_gpadl_created {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +	u32 gpadl;
> +	u32 creation_status;
> +} __packed;
> +
> +struct vmbus_channel_gpadl_teardown {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +	u32 gpadl;
> +} __packed;
> +
> +struct vmbus_channel_gpadl_torndown {
> +	struct vmbus_channel_message_header header;
> +	u32 gpadl;
> +} __packed;
> +
> +#ifdef
> VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
> +struct vmbus_channel_view_range_add {
> +	struct vmbus_channel_message_header header;
> +	PHYSICAL_ADDRESS viewrange_base;
> +	u64 viewrange_length;
> +	u32 child_relid;
> +} __packed;
> +
> +struct vmbus_channel_view_range_remove {
> +	struct vmbus_channel_message_header header;
> +	PHYSICAL_ADDRESS viewrange_base;
> +	u32 child_relid;
> +} __packed;
> +#endif
> +
> +struct vmbus_channel_relid_released {
> +	struct vmbus_channel_message_header header;
> +	u32 child_relid;
> +} __packed;
> +
> +struct vmbus_channel_initiate_contact {
> +	struct vmbus_channel_message_header header;
> +	u32 vmbus_version_requested;
> +	u32 padding2;
> +	u64 interrupt_page;
> +	u64 monitor_page1;
> +	u64 monitor_page2;
> +} __packed;
> +
> +struct vmbus_channel_version_response {
> +	struct vmbus_channel_message_header header;
> +	u8 version_supported;
> +} __packed;
> +
> +enum vmbus_channel_state {
> +	CHANNEL_OFFER_STATE,
> +	CHANNEL_OPENING_STATE,
> +	CHANNEL_OPEN_STATE,
> +	CHANNEL_OPENED_STATE,
> +};
> +
> +/*
> + * Represents each channel msg on the vmbus connection This is a
> + * variable-size data structure depending on the msg type itself
> + */
> +struct vmbus_channel_msginfo {
> +	/* Bookkeeping stuff */
> +	struct list_head msglistentry;
> +
> +	/* So far, this is only used to handle gpadl body message */
> +	struct list_head submsglist;
> +
> +	/* Synchronize the request/response if needed */
> +	struct completion  waitevent;
> +	union {
> +		struct vmbus_channel_version_supported version_supported;
> +		struct vmbus_channel_open_result open_result;
> +		struct vmbus_channel_gpadl_torndown gpadl_torndown;
> +		struct vmbus_channel_gpadl_created gpadl_created;
> +		struct vmbus_channel_version_response version_response;
> +	} response;
> +
> +	u32 msgsize;
> +	/*
> +	 * The channel message that goes out on the "wire".
> +	 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER
> header
> +	 */
> +	unsigned char msg[0];
> +};
> +
> +struct vmbus_close_msg {
> +	struct vmbus_channel_msginfo info;
> +	struct vmbus_channel_close_channel msg;
> +};
> +
> +/* Define connection identifier type. */
> +union hv_connection_id {
> +	u32 asu32;
> +	struct {
> +		u32 id:24;
> +		u32 reserved:8;
> +	} u;
> +};
> +
> +/* Definition of the hv_signal_event hypercall input structure. */
> +struct hv_input_signal_event {
> +	union hv_connection_id connectionid;
> +	u16 flag_number;
> +	u16 rsvdz;
> +};
> +
> +struct hv_input_signal_event_buffer {
> +	u64 align8;
> +	struct hv_input_signal_event event;
> +};
> +
> +struct vmbus_channel {
> +	struct list_head listentry;
> +
> +	struct hv_device *device_obj;
> +
> +	struct work_struct work;
> +
> +	enum vmbus_channel_state state;
> +
> +	struct vmbus_channel_offer_channel offermsg;
> +	/*
> +	 * These are based on the OfferMsg.MonitorId.
> +	 * Save it here for easy access.
> +	 */
> +	u8 monitor_grp;
> +	u8 monitor_bit;
> +
> +	u32 ringbuffer_gpadlhandle;
> +
> +	/* Allocated memory for ring buffer */
> +	void *ringbuffer_pages;
> +	u32 ringbuffer_pagecount;
> +	struct hv_ring_buffer_info outbound;	/* send to parent */
> +	struct hv_ring_buffer_info inbound;	/* receive from parent */
> +	spinlock_t inbound_lock;
> +	struct workqueue_struct *controlwq;
> +
> +	struct vmbus_close_msg close_msg;
> +
> +	/* Channel callback are invoked in this workqueue context */
> +	/* HANDLE dataWorkQueue; */
> +
> +	void (*onchannel_callback)(void *context);
> +	void *channel_callback_context;
> +
> +	/*
> +	 * A channel can be marked for efficient (batched)
> +	 * reading:
> +	 * If batched_reading is set to "true", we read until the
> +	 * channel is empty and hold off interrupts from the host
> +	 * during the entire read process.
> +	 * If batched_reading is set to "false", the client is not
> +	 * going to perform batched reading.
> +	 *
> +	 * By default we will enable batched reading; specific
> +	 * drivers that don't want this behavior can turn it off.
> +	 */
> +
> +	bool batched_reading;
> +
> +	bool is_dedicated_interrupt;
> +	struct hv_input_signal_event_buffer sig_buf;
> +	struct hv_input_signal_event *sig_event;
> +
> +	/*
> +	 * Starting with win8, this field will be used to specify
> +	 * the target virtual processor on which to deliver the interrupt for
> +	 * the host to guest communication.
> +	 * Prior to win8, incoming channel interrupts would only
> +	 * be delivered on cpu 0. Setting this value to 0 would
> +	 * preserve the earlier behavior.
> +	 */
> +	u32 target_vp;
> +	/*
> +	 * Support for sub-channels. For high performance devices,
> +	 * it will be useful to have multiple sub-channels to support
> +	 * a scalable communication infrastructure with the host.
> +	 * The support for sub-channels is implemented as an extention
> +	 * to the current infrastructure.
> +	 * The initial offer is considered the primary channel and this
> +	 * offer message will indicate if the host supports sub-channels.
> +	 * The guest is free to ask for sub-channels to be offerred and can
> +	 * open these sub-channels as a normal "primary" channel. However,
> +	 * all sub-channels will have the same type and instance guids as the
> +	 * primary channel. Requests sent on a given channel will result in a
> +	 * response on the same channel.
> +	 */
> +
> +	/*
> +	 * Sub-channel creation callback. This callback will be called in
> +	 * process context when a sub-channel offer is received from the host.
> +	 * The guest can open the sub-channel in the context of this callback.
> +	 */
> +	void (*sc_creation_callback)(struct vmbus_channel *new_sc);
> +
> +	spinlock_t sc_lock;
> +	/*
> +	 * All Sub-channels of a primary channel are linked here.
> +	 */
> +	struct list_head sc_list;
> +	/*
> +	 * The primary channel this sub-channel belongs to.
> +	 * This will be NULL for the primary channel.
> +	 */
> +	struct vmbus_channel *primary_channel;
> +};
> +
> +static inline void set_channel_read_state(struct vmbus_channel *c, bool state)
> +{
> +	c->batched_reading = state;
> +}
> +
> +void vmbus_onmessage(void *context);
> +
> +int vmbus_request_offers(void);
> +
> +/*
> + * APIs for managing sub-channels.
> + */
> +
> +void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
> +			void (*sc_cr_cb)(struct vmbus_channel *new_sc));
> +
> +/*
> + * Retrieve the (sub) channel on which to send an outgoing request.
> + * When a primary channel has multiple sub-channels, we choose a
> + * channel whose VCPU binding is closest to the VCPU on which
> + * this call is being made.
> + */
> +struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel
> *primary);
> +
> +/*
> + * Check if sub-channels have already been offerred. This API will be useful
> + * when the driver is unloaded after establishing sub-channels. In this case,
> + * when the driver is re-loaded, the driver would have to check if the
> + * subchannels have already been established before attempting to request
> + * the creation of sub-channels.
> + * This function returns TRUE to indicate that subchannels have already been
> + * created.
> + * This function should be invoked after setting the callback function for
> + * sub-channel creation.
> + */
> +bool vmbus_are_subchannels_present(struct vmbus_channel *primary);
> +
> +/* The format must be the same as struct vmdata_gpa_direct */
> +struct vmbus_channel_packet_page_buffer {
> +	u16 type;
> +	u16 dataoffset8;
> +	u16 length8;
> +	u16 flags;
> +	u64 transactionid;
> +	u32 reserved;
> +	u32 rangecount;
> +	struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
> +} __packed;
> +
> +/* The format must be the same as struct vmdata_gpa_direct */
> +struct vmbus_channel_packet_multipage_buffer {
> +	u16 type;
> +	u16 dataoffset8;
> +	u16 length8;
> +	u16 flags;
> +	u64 transactionid;
> +	u32 reserved;
> +	u32 rangecount;		/* Always 1 in this case */
> +	struct hv_multipage_buffer range;
> +} __packed;
> +
> +
> +extern int vmbus_open(struct vmbus_channel *channel,
> +			    u32 send_ringbuffersize,
> +			    u32 recv_ringbuffersize,
> +			    void *userdata,
> +			    u32 userdatalen,
> +			    void(*onchannel_callback)(void *context),
> +			    void *context);
> +
> +extern void vmbus_close(struct vmbus_channel *channel);
> +
> +extern int vmbus_sendpacket(struct vmbus_channel *channel,
> +				  const void *buffer,
> +				  u32 bufferLen,
> +				  u64 requestid,
> +				  enum vmbus_packet_type type,
> +				  u32 flags);
> +
> +extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
> +					    struct hv_page_buffer pagebuffers[],
> +					    u32 pagecount,
> +					    void *buffer,
> +					    u32 bufferlen,
> +					    u64 requestid);
> +
> +extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel
> *channel,
> +					struct hv_multipage_buffer *mpb,
> +					void *buffer,
> +					u32 bufferlen,
> +					u64 requestid);
> +
> +extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
> +				      void *kbuffer,
> +				      u32 size,
> +				      u32 *gpadl_handle);
> +
> +extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
> +				     u32 gpadl_handle);
> +
> +extern int vmbus_recvpacket(struct vmbus_channel *channel,
> +				  void *buffer,
> +				  u32 bufferlen,
> +				  u32 *buffer_actual_len,
> +				  u64 *requestid);
> +
> +extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
> +				     void *buffer,
> +				     u32 bufferlen,
> +				     u32 *buffer_actual_len,
> +				     u64 *requestid);
> +
> +
> +extern void vmbus_ontimer(unsigned long data);
> +
> +/* Base driver object */
> +struct hv_driver {
> +	const char *name;
> +
> +	/* the device type supported by this driver */
> +	uuid_le dev_type;
> +	const struct hv_vmbus_device_id *id_table;
> +
> +	struct device_driver driver;
> +
> +	int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
> +	int (*remove)(struct hv_device *);
> +	void (*shutdown)(struct hv_device *);
> +
> +};
> +
> +/* Base device object */
> +struct hv_device {
> +	/* the device type id of this device */
> +	uuid_le dev_type;
> +
> +	/* the device instance id of this device */
> +	uuid_le dev_instance;
> +
> +	struct device device;
> +
> +	struct vmbus_channel *channel;
> +};
> +
> +
> +static inline struct hv_device *device_to_hv_device(struct device *d)
> +{
> +	return container_of(d, struct hv_device, device);
> +}
> +
> +static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
> +{
> +	return container_of(d, struct hv_driver, driver);
> +}
> +
> +static inline void hv_set_drvdata(struct hv_device *dev, void *data)
> +{
> +	dev_set_drvdata(&dev->device, data);
> +}
> +
> +static inline void *hv_get_drvdata(struct hv_device *dev)
> +{
> +	return dev_get_drvdata(&dev->device);
> +}
> +
> +/* Vmbus interface */
> +#define vmbus_driver_register(driver)	\
> +	__vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
> +int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
> +					 struct module *owner,
> +					 const char *mod_name);
> +void vmbus_driver_unregister(struct hv_driver *hv_driver);
> +
> +/**
> + * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
> + *
> + * This macro is used to create a struct hv_vmbus_device_id that matches a
> + * specific device.
> + */
> +#define VMBUS_DEVICE(g0, g1, g2, g3, g4, g5, g6, g7,	\
> +		     g8, g9, ga, gb, gc, gd, ge, gf)	\
> +	.guid = { g0, g1, g2, g3, g4, g5, g6, g7,	\
> +		  g8, g9, ga, gb, gc, gd, ge, gf },
> +
> +/*
> + * GUID definitions of various offer types - services offered to the guest.
> + */
> +
> +/*
> + * Network GUID
> + * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
> + */
> +#define HV_NIC_GUID \
> +	.guid = { \
> +			0x63, 0x51, 0x61, 0xf8, 0x3e, 0xdf, 0xc5, 0x46, \
> +			0x91, 0x3f, 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e \
> +		}
> +
> +/*
> + * IDE GUID
> + * {32412632-86cb-44a2-9b5c-50d1417354f5}
> + */
> +#define HV_IDE_GUID \
> +	.guid = { \
> +			0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, \
> +			0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5 \
> +		}
> +
> +/*
> + * SCSI GUID
> + * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
> + */
> +#define HV_SCSI_GUID \
> +	.guid = { \
> +			0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, \
> +			0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f \
> +		}
> +
> +/*
> + * Shutdown GUID
> + * {0e0b6031-5213-4934-818b-38d90ced39db}
> + */
> +#define HV_SHUTDOWN_GUID \
> +	.guid = { \
> +			0x31, 0x60, 0x0b, 0x0e, 0x13, 0x52, 0x34, 0x49, \
> +			0x81, 0x8b, 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb \
> +		}
> +
> +/*
> + * Time Synch GUID
> + * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
> + */
> +#define HV_TS_GUID \
> +	.guid = { \
> +			0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49, \
> +			0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf \
> +		}
> +
> +/*
> + * Heartbeat GUID
> + * {57164f39-9115-4e78-ab55-382f3bd5422d}
> + */
> +#define HV_HEART_BEAT_GUID \
> +	.guid = { \
> +			0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e, \
> +			0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d \
> +		}
> +
> +/*
> + * KVP GUID
> + * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
> + */
> +#define HV_KVP_GUID \
> +	.guid = { \
> +			0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d, \
> +			0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6 \
> +		}
> +
> +/*
> + * Dynamic memory GUID
> + * {525074dc-8985-46e2-8057-a307dc18a502}
> + */
> +#define HV_DM_GUID \
> +	.guid = { \
> +			0xdc, 0x74, 0x50, 0X52, 0x85, 0x89, 0xe2, 0x46, \
> +			0x80, 0x57, 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02 \
> +		}
> +
> +/*
> + * Mouse GUID
> + * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
> + */
> +#define HV_MOUSE_GUID \
> +	.guid = { \
> +			0x9e, 0xb6, 0xa8, 0xcf, 0x4a, 0x5b, 0xc0, 0x4c, \
> +			0xb9, 0x8b, 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a \
> +		}
> +
> +/*
> + * VSS (Backup/Restore) GUID
> + */
> +#define HV_VSS_GUID \
> +	.guid = { \
> +			0x29, 0x2e, 0xfa, 0x35, 0x23, 0xea, 0x36, 0x42, \
> +			0x96, 0xae, 0x3a, 0x6e, 0xba, 0xcb, 0xa4,  0x40 \
> +		}
> +/*
> + * Synthetic Video GUID
> + * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
> + */
> +#define HV_SYNTHVID_GUID \
> +	.guid = { \
> +			0x02, 0x78, 0x0a, 0xda, 0x77, 0xe3, 0xac, 0x4a, \
> +			0x8e, 0x77, 0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8 \
> +		}
> +
> +/*
> + * Synthetic FC GUID
> + * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
> + */
> +#define HV_SYNTHFC_GUID \
> +	.guid = { \
> +			0x4A, 0xCC, 0x9B, 0x2F, 0x69, 0x00, 0xF3, 0x4A, \
> +			0xB7, 0x6B, 0x6F, 0xD0, 0xBE, 0x52, 0x8C, 0xDA \
> +		}
> +
> +/*
> + * Common header for Hyper-V ICs
> + */
> +
> +#define ICMSGTYPE_NEGOTIATE		0
> +#define ICMSGTYPE_HEARTBEAT		1
> +#define ICMSGTYPE_KVPEXCHANGE		2
> +#define ICMSGTYPE_SHUTDOWN		3
> +#define ICMSGTYPE_TIMESYNC		4
> +#define ICMSGTYPE_VSS			5
> +
> +#define ICMSGHDRFLAG_TRANSACTION	1
> +#define ICMSGHDRFLAG_REQUEST		2
> +#define ICMSGHDRFLAG_RESPONSE		4
> +
> +
> +/*
> + * While we want to handle util services as regular devices,
> + * there is only one instance of each of these services; so
> + * we statically allocate the service specific state.
> + */
> +
> +struct hv_util_service {
> +	u8 *recv_buffer;
> +	void (*util_cb)(void *);
> +	int (*util_init)(struct hv_util_service *);
> +	void (*util_deinit)(void);
> +};
> +
> +struct vmbuspipe_hdr {
> +	u32 flags;
> +	u32 msgsize;
> +} __packed;
> +
> +struct ic_version {
> +	u16 major;
> +	u16 minor;
> +} __packed;
> +
> +struct icmsg_hdr {
> +	struct ic_version icverframe;
> +	u16 icmsgtype;
> +	struct ic_version icvermsg;
> +	u16 icmsgsize;
> +	u32 status;
> +	u8 ictransaction_id;
> +	u8 icflags;
> +	u8 reserved[2];
> +} __packed;
> +
> +struct icmsg_negotiate {
> +	u16 icframe_vercnt;
> +	u16 icmsg_vercnt;
> +	u32 reserved;
> +	struct ic_version icversion_data[1]; /* any size array */
> +} __packed;
> +
> +struct shutdown_msg_data {
> +	u32 reason_code;
> +	u32 timeout_seconds;
> +	u32 flags;
> +	u8  display_message[2048];
> +} __packed;
> +
> +struct heartbeat_msg_data {
> +	u64 seq_num;
> +	u32 reserved[8];
> +} __packed;
> +
> +/* Time Sync IC defs */
> +#define ICTIMESYNCFLAG_PROBE	0
> +#define ICTIMESYNCFLAG_SYNC	1
> +#define ICTIMESYNCFLAG_SAMPLE	2
> +
> +#ifdef __x86_64__
> +#define WLTIMEDELTA	116444736000000000L	/* in 100ns unit */
> +#else
> +#define WLTIMEDELTA	116444736000000000LL
> +#endif
> +
> +struct ictimesync_data {
> +	u64 parenttime;
> +	u64 childtime;
> +	u64 roundtriptime;
> +	u8 flags;
> +} __packed;
> +
> +struct hyperv_service_callback {
> +	u8 msg_type;
> +	char *log_msg;
> +	uuid_le data;
> +	struct vmbus_channel *channel;
> +	void (*callback) (void *context);
> +};
> +
> +#define MAX_SRV_VER	0x7ffffff
> +extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *,
> +					struct icmsg_negotiate *, u8 *, int,
> +					int);
> +
> +int hv_kvp_init(struct hv_util_service *);
> +void hv_kvp_deinit(void);
> +void hv_kvp_onchannelcallback(void *);
> +
> +int hv_vss_init(struct hv_util_service *);
> +void hv_vss_deinit(void);
> +void hv_vss_onchannelcallback(void *);
> +
> +/*
> + * Negotiated version with the Host.
> + */
> +
> +extern __u32 vmbus_proto_version;
> +
> +#endif /* __KERNEL__ */
> +#endif /* _HYPERV_H */
> --
> 1.8.5.3

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