[linux-block.git] / drivers / staging / hv / hv_util.c

/*
 * Copyright (c) 2010, 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>
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/reboot.h>
#include <linux/dmi.h>
#include <linux/pci.h>

#include "logging.h"
#include "hv_api.h"
#include "vmbus.h"
#include "vmbus_packet_format.h"
#include "vmbus_channel_interface.h"
#include "version_info.h"
#include "channel.h"
#include "vmbus_private.h"
#include "vmbus_api.h"
#include "utils.h"
#include "hv_kvp.h"

static u8 *shut_txf_buf;
static u8 *time_txf_buf;
static u8 *hbeat_txf_buf;

static void shutdown_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	u8  execute_shutdown = false;

	struct shutdown_msg_data *shutdown_msg;

	struct icmsg_hdr *icmsghdrp;
	struct icmsg_negotiate *negop = NULL;

	vmbus_recvpacket(channel, shut_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
			sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
		} else {
			shutdown_msg =
				(struct shutdown_msg_data *)&shut_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

			switch (shutdown_msg->flags) {
			case 0:
			case 1:
				icmsghdrp->status = HV_S_OK;
				execute_shutdown = true;

				DPRINT_INFO(VMBUS, "Shutdown request received -"
					    " gracefull shutdown initiated");
				break;
			default:
				icmsghdrp->status = HV_E_FAIL;
				execute_shutdown = false;

				DPRINT_INFO(VMBUS, "Shutdown request received -"
					    " Invalid request");
				break;
			};
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, shut_txf_buf,
				       recvlen, requestid,
				       VM_PKT_DATA_INBAND, 0);
	}

	if (execute_shutdown == true)
		orderly_poweroff(false);
}

/*
 * Set guest time to host UTC time.
 */
static inline void do_adj_guesttime(u64 hosttime)
{
	s64 host_tns;
	struct timespec host_ts;

	host_tns = (hosttime - WLTIMEDELTA) * 100;
	host_ts = ns_to_timespec(host_tns);

	do_settimeofday(&host_ts);
}

/*
 * Synchronize time with host after reboot, restore, etc.
 *
 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
 * message after the timesync channel is opened. Since the hv_utils module is
 * loaded after hv_vmbus, the first message is usually missed. The other
 * thing is, systime is automatically set to emulated hardware clock which may
 * not be UTC time or in the same time zone. So, to override these effects, we
 * use the first 50 time samples for initial system time setting.
 */
static inline void adj_guesttime(u64 hosttime, u8 flags)
{
	static s32 scnt = 50;

	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
		do_adj_guesttime(hosttime);
		return;
	}

	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
		scnt--;
		do_adj_guesttime(hosttime);
	}
}

/*
 * Time Sync Channel message handler.
 */
static void timesync_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	struct icmsg_hdr *icmsghdrp;
	struct ictimesync_data *timedatap;

	vmbus_recvpacket(channel, time_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
				sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
		} else {
			timedatap = (struct ictimesync_data *)&time_txf_buf[
				sizeof(struct vmbuspipe_hdr) +
				sizeof(struct icmsg_hdr)];
			adj_guesttime(timedatap->parenttime, timedatap->flags);
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, time_txf_buf,
				recvlen, requestid,
				VM_PKT_DATA_INBAND, 0);
	}
}

/*
 * Heartbeat functionality.
 * Every two seconds, Hyper-V send us a heartbeat request message.
 * we respond to this message, and Hyper-V knows we are alive.
 */
static void heartbeat_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	struct icmsg_hdr *icmsghdrp;
	struct heartbeat_msg_data *heartbeat_msg;

	vmbus_recvpacket(channel, hbeat_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
				sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
		} else {
			heartbeat_msg =
				(struct heartbeat_msg_data *)&hbeat_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

			heartbeat_msg->seq_num += 1;
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, hbeat_txf_buf,
				       recvlen, requestid,
				       VM_PKT_DATA_INBAND, 0);
	}
}

static const struct pci_device_id __initconst
hv_utils_pci_table[] __maybe_unused = {
	{ PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, hv_utils_pci_table);


static const struct dmi_system_id __initconst
hv_utils_dmi_table[] __maybe_unused  = {
	{
		.ident = "Hyper-V",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
			DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
		},
	},
	{ },
};
MODULE_DEVICE_TABLE(dmi, hv_utils_dmi_table);


static int __init init_hyperv_utils(void)
{
	printk(KERN_INFO "Registering HyperV Utility Driver\n");

	if (hv_kvp_init())
		return -ENODEV;


	if (!dmi_check_system(hv_utils_dmi_table))
		return -ENODEV;

	shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);

	if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) {
		printk(KERN_INFO
		       "Unable to allocate memory for receive buffer\n");
		kfree(shut_txf_buf);
		kfree(time_txf_buf);
		kfree(hbeat_txf_buf);
		return -ENOMEM;
	}

	hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
		&shutdown_onchannelcallback;
	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;

	hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
		&timesync_onchannelcallback;
	hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;

	hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
		&heartbeat_onchannelcallback;
	hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;

	hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
		&hv_kvp_onchannelcallback;


	return 0;
}

static void exit_hyperv_utils(void)
{
	printk(KERN_INFO "De-Registered HyperV Utility Driver\n");

	hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
		&chn_cb_negotiate;
	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;

	hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
		&chn_cb_negotiate;
	hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;

	hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
		&chn_cb_negotiate;
	hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;

	hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
		&chn_cb_negotiate;
	hv_kvp_deinit();

	kfree(shut_txf_buf);
	kfree(time_txf_buf);
	kfree(hbeat_txf_buf);
}

module_init(init_hyperv_utils);
module_exit(exit_hyperv_utils);

MODULE_DESCRIPTION("Hyper-V Utilities");
MODULE_VERSION(HV_DRV_VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
c88c4e4c HJ	1	/*
	2	* Copyright (c) 2010, Microsoft Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307 USA.
	16	*
	17	* Authors:
	18	* Haiyang Zhang <haiyangz@microsoft.com>
	19	* Hank Janssen <hjanssen@microsoft.com>
	20	*/
	21	#include <linux/kernel.h>
	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/slab.h>
	25	#include <linux/sysctl.h>
9e629075	26	#include <linux/reboot.h>
d750785f HZ	27	#include <linux/dmi.h>
d750785f HZ	28	#include <linux/pci.h>
c88c4e4c HJ	29
c88c4e4c HJ	30	#include "logging.h"
e3fe0bb6	31	#include "hv_api.h"
c88c4e4c	32	#include "vmbus.h"
f8e5add2	33	#include "vmbus_packet_format.h"
0e0ab5f5	34	#include "vmbus_channel_interface.h"
2d82f6c7	35	#include "version_info.h"
4df90be5	36	#include "channel.h"
72daf320	37	#include "vmbus_private.h"
447fc67e	38	#include "vmbus_api.h"
c88c4e4c	39	#include "utils.h"
245ba56a	40	#include "hv_kvp.h"
c88c4e4c	41
45241e50 HJ	42	static u8 *shut_txf_buf;
	43	static u8 *time_txf_buf;
	44	static u8 *hbeat_txf_buf;
c88c4e4c	45
6610944a	46	static void shutdown_onchannelcallback(void *context)
c88c4e4c HJ	47	{
c88c4e4c HJ	48	struct vmbus_channel *channel = context;
45241e50	49	u32 recvlen;
c88c4e4c HJ	50	u64 requestid;
	51	u8 execute_shutdown = false;
	52
	53	struct shutdown_msg_data *shutdown_msg;
	54
	55	struct icmsg_hdr *icmsghdrp;
	56	struct icmsg_negotiate *negop = NULL;
	57
45241e50 HJ	58	vmbus_recvpacket(channel, shut_txf_buf,
45241e50 HJ	59	PAGE_SIZE, &recvlen, &requestid);
c88c4e4c HJ	60
c88c4e4c HJ	61	if (recvlen > 0) {
45241e50	62	icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
c88c4e4c HJ	63	sizeof(struct vmbuspipe_hdr)];
	64
	65	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
45241e50	66	prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
c88c4e4c	67	} else {
45241e50 HJ	68	shutdown_msg =
	69	(struct shutdown_msg_data *)&shut_txf_buf[
	70	sizeof(struct vmbuspipe_hdr) +
	71	sizeof(struct icmsg_hdr)];
c88c4e4c HJ	72
	73	switch (shutdown_msg->flags) {
	74	case 0:
	75	case 1:
	76	icmsghdrp->status = HV_S_OK;
	77	execute_shutdown = true;
	78
	79	DPRINT_INFO(VMBUS, "Shutdown request received -"
	80	" gracefull shutdown initiated");
	81	break;
	82	default:
	83	icmsghdrp->status = HV_E_FAIL;
	84	execute_shutdown = false;
	85
	86	DPRINT_INFO(VMBUS, "Shutdown request received -"
	87	" Invalid request");
	88	break;
	89	};
	90	}
	91
	92	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	93	\| ICMSGHDRFLAG_RESPONSE;
	94
45241e50	95	vmbus_sendpacket(channel, shut_txf_buf,
c88c4e4c	96	recvlen, requestid,
415f2287	97	VM_PKT_DATA_INBAND, 0);
c88c4e4c HJ	98	}
c88c4e4c HJ	99
c88c4e4c	100	if (execute_shutdown == true)
9e629075	101	orderly_poweroff(false);
c88c4e4c HJ	102	}
c88c4e4c HJ	103
39c4e9c3	104	/*
e9ec3603	105	* Set guest time to host UTC time.
39c4e9c3	106	*/
e9ec3603	107	static inline void do_adj_guesttime(u64 hosttime)
39c4e9c3 HZ	108	{
	109	s64 host_tns;
	110	struct timespec host_ts;
39c4e9c3 HZ	111
	112	host_tns = (hosttime - WLTIMEDELTA) * 100;
	113	host_ts = ns_to_timespec(host_tns);
	114
e9ec3603 HZ	115	do_settimeofday(&host_ts);
	116	}
	117
	118	/*
	119	* Synchronize time with host after reboot, restore, etc.
	120	*
	121	* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
	122	* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
	123	* message after the timesync channel is opened. Since the hv_utils module is
	124	* loaded after hv_vmbus, the first message is usually missed. The other
	125	* thing is, systime is automatically set to emulated hardware clock which may
	126	* not be UTC time or in the same time zone. So, to override these effects, we
	127	* use the first 50 time samples for initial system time setting.
	128	*/
	129	static inline void adj_guesttime(u64 hosttime, u8 flags)
	130	{
	131	static s32 scnt = 50;
	132
39c4e9c3	133	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
e9ec3603	134	do_adj_guesttime(hosttime);
39c4e9c3 HZ	135	return;
	136	}
	137
e9ec3603	138	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
39c4e9c3	139	scnt--;
e9ec3603	140	do_adj_guesttime(hosttime);
39c4e9c3	141	}
39c4e9c3 HZ	142	}
	143
	144	/*
	145	* Time Sync Channel message handler.
	146	*/
	147	static void timesync_onchannelcallback(void *context)
	148	{
	149	struct vmbus_channel *channel = context;
45241e50	150	u32 recvlen;
39c4e9c3 HZ	151	u64 requestid;
	152	struct icmsg_hdr *icmsghdrp;
	153	struct ictimesync_data *timedatap;
	154
45241e50 HJ	155	vmbus_recvpacket(channel, time_txf_buf,
45241e50 HJ	156	PAGE_SIZE, &recvlen, &requestid);
39c4e9c3 HZ	157
39c4e9c3 HZ	158	if (recvlen > 0) {
45241e50	159	icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
39c4e9c3 HZ	160	sizeof(struct vmbuspipe_hdr)];
	161
	162	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
45241e50	163	prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
39c4e9c3	164	} else {
45241e50	165	timedatap = (struct ictimesync_data *)&time_txf_buf[
39c4e9c3 HZ	166	sizeof(struct vmbuspipe_hdr) +
	167	sizeof(struct icmsg_hdr)];
	168	adj_guesttime(timedatap->parenttime, timedatap->flags);
	169	}
	170
	171	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	172	\| ICMSGHDRFLAG_RESPONSE;
	173
45241e50	174	vmbus_sendpacket(channel, time_txf_buf,
39c4e9c3	175	recvlen, requestid,
415f2287	176	VM_PKT_DATA_INBAND, 0);
39c4e9c3	177	}
39c4e9c3 HZ	178	}
39c4e9c3 HZ	179
9153f7b9 HJ	180	/*
	181	* Heartbeat functionality.
	182	* Every two seconds, Hyper-V send us a heartbeat request message.
	183	* we respond to this message, and Hyper-V knows we are alive.
	184	*/
	185	static void heartbeat_onchannelcallback(void *context)
	186	{
	187	struct vmbus_channel *channel = context;
45241e50	188	u32 recvlen;
9153f7b9 HJ	189	u64 requestid;
	190	struct icmsg_hdr *icmsghdrp;
	191	struct heartbeat_msg_data *heartbeat_msg;
	192
45241e50 HJ	193	vmbus_recvpacket(channel, hbeat_txf_buf,
45241e50 HJ	194	PAGE_SIZE, &recvlen, &requestid);
9153f7b9 HJ	195
9153f7b9 HJ	196	if (recvlen > 0) {
45241e50	197	icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
9153f7b9 HJ	198	sizeof(struct vmbuspipe_hdr)];
	199
	200	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
45241e50	201	prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
9153f7b9	202	} else {
45241e50 HJ	203	heartbeat_msg =
	204	(struct heartbeat_msg_data *)&hbeat_txf_buf[
	205	sizeof(struct vmbuspipe_hdr) +
	206	sizeof(struct icmsg_hdr)];
9153f7b9	207
9153f7b9 HJ	208	heartbeat_msg->seq_num += 1;
	209	}
	210
	211	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	212	\| ICMSGHDRFLAG_RESPONSE;
	213
45241e50	214	vmbus_sendpacket(channel, hbeat_txf_buf,
9153f7b9	215	recvlen, requestid,
415f2287	216	VM_PKT_DATA_INBAND, 0);
9153f7b9	217	}
9153f7b9	218	}
39c4e9c3	219
d750785f HZ	220	static const struct pci_device_id __initconst
	221	hv_utils_pci_table[] __maybe_unused = {
	222	{ PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */
	223	{ 0 }
	224	};
	225	MODULE_DEVICE_TABLE(pci, hv_utils_pci_table);
	226
	227
	228	static const struct dmi_system_id __initconst
	229	hv_utils_dmi_table[] __maybe_unused = {
	230	{
	231	.ident = "Hyper-V",
	232	.matches = {
	233	DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
	234	DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
	235	DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
	236	},
	237	},
	238	{ },
	239	};
	240	MODULE_DEVICE_TABLE(dmi, hv_utils_dmi_table);
	241
	242
c88c4e4c HJ	243	static int __init init_hyperv_utils(void)
	244	{
	245	printk(KERN_INFO "Registering HyperV Utility Driver\n");
	246
245ba56a KS	247	if (hv_kvp_init())
	248	return -ENODEV;
	249
	250
d750785f HZ	251	if (!dmi_check_system(hv_utils_dmi_table))
	252	return -ENODEV;
	253
45241e50 HJ	254	shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	255	time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	256	hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	257
	258	if (!shut_txf_buf \|\| !time_txf_buf \|\| !hbeat_txf_buf) {
	259	printk(KERN_INFO
	260	"Unable to allocate memory for receive buffer\n");
	261	kfree(shut_txf_buf);
	262	kfree(time_txf_buf);
	263	kfree(hbeat_txf_buf);
	264	return -ENOMEM;
	265	}
	266
c50f7fb2	267	hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
c88c4e4c HJ	268	&shutdown_onchannelcallback;
	269	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
	270
c50f7fb2	271	hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
39c4e9c3 HZ	272	&timesync_onchannelcallback;
	273	hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;
	274
c50f7fb2	275	hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
9153f7b9 HJ	276	&heartbeat_onchannelcallback;
	277	hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;
	278
245ba56a KS	279	hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
	280	&hv_kvp_onchannelcallback;
	281
	282
	283
c88c4e4c HJ	284	return 0;
	285	}
	286
	287	static void exit_hyperv_utils(void)
	288	{
	289	printk(KERN_INFO "De-Registered HyperV Utility Driver\n");
	290
c50f7fb2	291	hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
c88c4e4c HJ	292	&chn_cb_negotiate;
c88c4e4c HJ	293	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
39c4e9c3	294
c50f7fb2	295	hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
39c4e9c3 HZ	296	&chn_cb_negotiate;
39c4e9c3 HZ	297	hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
9153f7b9	298
c50f7fb2	299	hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
9153f7b9 HJ	300	&chn_cb_negotiate;
9153f7b9 HJ	301	hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
45241e50	302
245ba56a KS	303	hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
	304	&chn_cb_negotiate;
	305	hv_kvp_deinit();
	306
45241e50 HJ	307	kfree(shut_txf_buf);
	308	kfree(time_txf_buf);
	309	kfree(hbeat_txf_buf);
c88c4e4c HJ	310	}
	311
	312	module_init(init_hyperv_utils);
	313	module_exit(exit_hyperv_utils);
	314
	315	MODULE_DESCRIPTION("Hyper-V Utilities");
	316	MODULE_VERSION(HV_DRV_VERSION);
	317	MODULE_LICENSE("GPL");