Initial import

1 files changed, 722 insertions, 0 deletions

diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
new file mode 100644
index 000000000..beb8105c0
--- /dev/null
+++ b/drivers/hv/hv_kvp.c
@@ -0,0 +1,722 @@
+/*
+ * An implementation of key value pair (KVP) functionality for Linux.
+ *
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/net.h>
+#include <linux/nls.h>
+#include <linux/connector.h>
+#include <linux/workqueue.h>
+#include <linux/hyperv.h>
+
+
+/*
+ * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
+ */
+#define WS2008_SRV_MAJOR	1
+#define WS2008_SRV_MINOR	0
+#define WS2008_SRV_VERSION     (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR)
+
+#define WIN7_SRV_MAJOR   3
+#define WIN7_SRV_MINOR   0
+#define WIN7_SRV_VERSION     (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR)
+
+#define WIN8_SRV_MAJOR   4
+#define WIN8_SRV_MINOR   0
+#define WIN8_SRV_VERSION     (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
+
+/*
+ * Global state maintained for transaction that is being processed.
+ * Note that only one transaction can be active at any point in time.
+ *
+ * This state is set when we receive a request from the host; we
+ * cleanup this state when the transaction is completed - when we respond
+ * to the host with the key value.
+ */
+
+static struct {
+	bool active; /* transaction status - active or not */
+	int recv_len; /* number of bytes received. */
+	struct hv_kvp_msg  *kvp_msg; /* current message */
+	struct vmbus_channel *recv_channel; /* chn we got the request */
+	u64 recv_req_id; /* request ID. */
+	void *kvp_context; /* for the channel callback */
+} kvp_transaction;
+
+/*
+ * Before we can accept KVP messages from the host, we need
+ * to handshake with the user level daemon. This state tracks
+ * if we are in the handshake phase.
+ */
+static bool in_hand_shake = true;
+
+/*
+ * This state maintains the version number registered by the daemon.
+ */
+static int dm_reg_value;
+
+static void kvp_send_key(struct work_struct *dummy);
+
+
+static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error);
+static void kvp_work_func(struct work_struct *dummy);
+static void kvp_register(int);
+
+static DECLARE_DELAYED_WORK(kvp_work, kvp_work_func);
+static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
+
+static struct cb_id kvp_id = { CN_KVP_IDX, CN_KVP_VAL };
+static const char kvp_name[] = "kvp_kernel_module";
+static u8 *recv_buffer;
+/*
+ * Register the kernel component with the user-level daemon.
+ * As part of this registration, pass the LIC version number.
+ * This number has no meaning, it satisfies the registration protocol.
+ */
+#define HV_DRV_VERSION           "3.1"
+
+static void
+kvp_register(int reg_value)
+{
+
+	struct cn_msg *msg;
+	struct hv_kvp_msg *kvp_msg;
+	char *version;
+
+	msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg), GFP_ATOMIC);
+
+	if (msg) {
+		kvp_msg = (struct hv_kvp_msg *)msg->data;
+		version = kvp_msg->body.kvp_register.version;
+		msg->id.idx =  CN_KVP_IDX;
+		msg->id.val = CN_KVP_VAL;
+
+		kvp_msg->kvp_hdr.operation = reg_value;
+		strcpy(version, HV_DRV_VERSION);
+		msg->len = sizeof(struct hv_kvp_msg);
+		cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+		kfree(msg);
+	}
+}
+static void
+kvp_work_func(struct work_struct *dummy)
+{
+	/*
+	 * If the timer fires, the user-mode component has not responded;
+	 * process the pending transaction.
+	 */
+	kvp_respond_to_host(NULL, HV_E_FAIL);
+}
+
+static void poll_channel(struct vmbus_channel *channel)
+{
+	if (channel->target_cpu != smp_processor_id())
+		smp_call_function_single(channel->target_cpu,
+					 hv_kvp_onchannelcallback,
+					 channel, true);
+	else
+		hv_kvp_onchannelcallback(channel);
+}
+
+
+static int kvp_handle_handshake(struct hv_kvp_msg *msg)
+{
+	int ret = 1;
+
+	switch (msg->kvp_hdr.operation) {
+	case KVP_OP_REGISTER:
+		dm_reg_value = KVP_OP_REGISTER;
+		pr_info("KVP: IP injection functionality not available\n");
+		pr_info("KVP: Upgrade the KVP daemon\n");
+		break;
+	case KVP_OP_REGISTER1:
+		dm_reg_value = KVP_OP_REGISTER1;
+		break;
+	default:
+		pr_info("KVP: incompatible daemon\n");
+		pr_info("KVP: KVP version: %d, Daemon version: %d\n",
+			KVP_OP_REGISTER1, msg->kvp_hdr.operation);
+		ret = 0;
+	}
+
+	if (ret) {
+		/*
+		 * We have a compatible daemon; complete the handshake.
+		 */
+		pr_info("KVP: user-mode registering done.\n");
+		kvp_register(dm_reg_value);
+		kvp_transaction.active = false;
+		if (kvp_transaction.kvp_context)
+			poll_channel(kvp_transaction.kvp_context);
+	}
+	return ret;
+}
+
+
+/*
+ * Callback when data is received from user mode.
+ */
+
+static void
+kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+{
+	struct hv_kvp_msg *message;
+	struct hv_kvp_msg_enumerate *data;
+	int	error = 0;
+
+	message = (struct hv_kvp_msg *)msg->data;
+
+	/*
+	 * If we are negotiating the version information
+	 * with the daemon; handle that first.
+	 */
+
+	if (in_hand_shake) {
+		if (kvp_handle_handshake(message))
+			in_hand_shake = false;
+		return;
+	}
+
+	/*
+	 * Based on the version of the daemon, we propagate errors from the
+	 * daemon differently.
+	 */
+
+	data = &message->body.kvp_enum_data;
+
+	switch (dm_reg_value) {
+	case KVP_OP_REGISTER:
+		/*
+		 * Null string is used to pass back error condition.
+		 */
+		if (data->data.key[0] == 0)
+			error = HV_S_CONT;
+		break;
+
+	case KVP_OP_REGISTER1:
+		/*
+		 * We use the message header information from
+		 * the user level daemon to transmit errors.
+		 */
+		error = message->error;
+		break;
+	}
+
+	/*
+	 * Complete the transaction by forwarding the key value
+	 * to the host. But first, cancel the timeout.
+	 */
+	if (cancel_delayed_work_sync(&kvp_work))
+		kvp_respond_to_host(message, error);
+}
+
+
+static int process_ob_ipinfo(void *in_msg, void *out_msg, int op)
+{
+	struct hv_kvp_msg *in = in_msg;
+	struct hv_kvp_ip_msg *out = out_msg;
+	int len;
+
+	switch (op) {
+	case KVP_OP_GET_IP_INFO:
+		/*
+		 * Transform all parameters into utf16 encoding.
+		 */
+		len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr,
+				strlen((char *)in->body.kvp_ip_val.ip_addr),
+				UTF16_HOST_ENDIAN,
+				(wchar_t *)out->kvp_ip_val.ip_addr,
+				MAX_IP_ADDR_SIZE);
+		if (len < 0)
+			return len;
+
+		len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net,
+				strlen((char *)in->body.kvp_ip_val.sub_net),
+				UTF16_HOST_ENDIAN,
+				(wchar_t *)out->kvp_ip_val.sub_net,
+				MAX_IP_ADDR_SIZE);
+		if (len < 0)
+			return len;
+
+		len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way,
+				strlen((char *)in->body.kvp_ip_val.gate_way),
+				UTF16_HOST_ENDIAN,
+				(wchar_t *)out->kvp_ip_val.gate_way,
+				MAX_GATEWAY_SIZE);
+		if (len < 0)
+			return len;
+
+		len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr,
+				strlen((char *)in->body.kvp_ip_val.dns_addr),
+				UTF16_HOST_ENDIAN,
+				(wchar_t *)out->kvp_ip_val.dns_addr,
+				MAX_IP_ADDR_SIZE);
+		if (len < 0)
+			return len;
+
+		len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id,
+				strlen((char *)in->body.kvp_ip_val.adapter_id),
+				UTF16_HOST_ENDIAN,
+				(wchar_t *)out->kvp_ip_val.adapter_id,
+				MAX_IP_ADDR_SIZE);
+		if (len < 0)
+			return len;
+
+		out->kvp_ip_val.dhcp_enabled =
+			in->body.kvp_ip_val.dhcp_enabled;
+		out->kvp_ip_val.addr_family =
+			in->body.kvp_ip_val.addr_family;
+	}
+
+	return 0;
+}
+
+static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
+{
+	struct hv_kvp_ip_msg *in = in_msg;
+	struct hv_kvp_msg *out = out_msg;
+
+	switch (op) {
+	case KVP_OP_SET_IP_INFO:
+		/*
+		 * Transform all parameters into utf8 encoding.
+		 */
+		utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr,
+				MAX_IP_ADDR_SIZE,
+				UTF16_LITTLE_ENDIAN,
+				(__u8 *)out->body.kvp_ip_val.ip_addr,
+				MAX_IP_ADDR_SIZE);
+
+		utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net,
+				MAX_IP_ADDR_SIZE,
+				UTF16_LITTLE_ENDIAN,
+				(__u8 *)out->body.kvp_ip_val.sub_net,
+				MAX_IP_ADDR_SIZE);
+
+		utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way,
+				MAX_GATEWAY_SIZE,
+				UTF16_LITTLE_ENDIAN,
+				(__u8 *)out->body.kvp_ip_val.gate_way,
+				MAX_GATEWAY_SIZE);
+
+		utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr,
+				MAX_IP_ADDR_SIZE,
+				UTF16_LITTLE_ENDIAN,
+				(__u8 *)out->body.kvp_ip_val.dns_addr,
+				MAX_IP_ADDR_SIZE);
+
+		out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled;
+
+	default:
+		utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id,
+				MAX_ADAPTER_ID_SIZE,
+				UTF16_LITTLE_ENDIAN,
+				(__u8 *)out->body.kvp_ip_val.adapter_id,
+				MAX_ADAPTER_ID_SIZE);
+
+		out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family;
+	}
+}
+
+
+
+
+static void
+kvp_send_key(struct work_struct *dummy)
+{
+	struct cn_msg *msg;
+	struct hv_kvp_msg *message;
+	struct hv_kvp_msg *in_msg;
+	__u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
+	__u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
+	__u32 val32;
+	__u64 val64;
+	int rc;
+
+	msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
+	if (!msg)
+		return;
+
+	msg->id.idx =  CN_KVP_IDX;
+	msg->id.val = CN_KVP_VAL;
+
+	message = (struct hv_kvp_msg *)msg->data;
+	message->kvp_hdr.operation = operation;
+	message->kvp_hdr.pool = pool;
+	in_msg = kvp_transaction.kvp_msg;
+
+	/*
+	 * The key/value strings sent from the host are encoded in
+	 * in utf16; convert it to utf8 strings.
+	 * The host assures us that the utf16 strings will not exceed
+	 * the max lengths specified. We will however, reserve room
+	 * for the string terminating character - in the utf16s_utf8s()
+	 * function we limit the size of the buffer where the converted
+	 * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee
+	 * that the strings can be properly terminated!
+	 */
+
+	switch (message->kvp_hdr.operation) {
+	case KVP_OP_SET_IP_INFO:
+		process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO);
+		break;
+	case KVP_OP_GET_IP_INFO:
+		process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO);
+		break;
+	case KVP_OP_SET:
+		switch (in_msg->body.kvp_set.data.value_type) {
+		case REG_SZ:
+			/*
+			 * The value is a string - utf16 encoding.
+			 */
+			message->body.kvp_set.data.value_size =
+				utf16s_to_utf8s(
+				(wchar_t *)in_msg->body.kvp_set.data.value,
+				in_msg->body.kvp_set.data.value_size,
+				UTF16_LITTLE_ENDIAN,
+				message->body.kvp_set.data.value,
+				HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
+				break;
+
+		case REG_U32:
+			/*
+			 * The value is a 32 bit scalar.
+			 * We save this as a utf8 string.
+			 */
+			val32 = in_msg->body.kvp_set.data.value_u32;
+			message->body.kvp_set.data.value_size =
+				sprintf(message->body.kvp_set.data.value,
+					"%d", val32) + 1;
+			break;
+
+		case REG_U64:
+			/*
+			 * The value is a 64 bit scalar.
+			 * We save this as a utf8 string.
+			 */
+			val64 = in_msg->body.kvp_set.data.value_u64;
+			message->body.kvp_set.data.value_size =
+				sprintf(message->body.kvp_set.data.value,
+					"%llu", val64) + 1;
+			break;
+
+		}
+	case KVP_OP_GET:
+		message->body.kvp_set.data.key_size =
+			utf16s_to_utf8s(
+			(wchar_t *)in_msg->body.kvp_set.data.key,
+			in_msg->body.kvp_set.data.key_size,
+			UTF16_LITTLE_ENDIAN,
+			message->body.kvp_set.data.key,
+			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+			break;
+
+	case KVP_OP_DELETE:
+		message->body.kvp_delete.key_size =
+			utf16s_to_utf8s(
+			(wchar_t *)in_msg->body.kvp_delete.key,
+			in_msg->body.kvp_delete.key_size,
+			UTF16_LITTLE_ENDIAN,
+			message->body.kvp_delete.key,
+			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+			break;
+
+	case KVP_OP_ENUMERATE:
+		message->body.kvp_enum_data.index =
+			in_msg->body.kvp_enum_data.index;
+			break;
+	}
+
+	msg->len = sizeof(struct hv_kvp_msg);
+	rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+	if (rc) {
+		pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
+		if (cancel_delayed_work_sync(&kvp_work))
+			kvp_respond_to_host(message, HV_E_FAIL);
+	}
+
+	kfree(msg);
+
+	return;
+}
+
+/*
+ * Send a response back to the host.
+ */
+
+static void
+kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error)
+{
+	struct hv_kvp_msg  *kvp_msg;
+	struct hv_kvp_exchg_msg_value  *kvp_data;
+	char	*key_name;
+	char	*value;
+	struct icmsg_hdr *icmsghdrp;
+	int	keylen = 0;
+	int	valuelen = 0;
+	u32	buf_len;
+	struct vmbus_channel *channel;
+	u64	req_id;
+	int ret;
+
+	/*
+	 * If a transaction is not active; log and return.
+	 */
+
+	if (!kvp_transaction.active) {
+		/*
+		 * This is a spurious call!
+		 */
+		pr_warn("KVP: Transaction not active\n");
+		return;
+	}
+	/*
+	 * Copy the global state for completing the transaction. Note that
+	 * only one transaction can be active at a time.
+	 */
+
+	buf_len = kvp_transaction.recv_len;
+	channel = kvp_transaction.recv_channel;
+	req_id = kvp_transaction.recv_req_id;
+
+	kvp_transaction.active = false;
+
+	icmsghdrp = (struct icmsg_hdr *)
+			&recv_buffer[sizeof(struct vmbuspipe_hdr)];
+
+	if (channel->onchannel_callback == NULL)
+		/*
+		 * We have raced with util driver being unloaded;
+		 * silently return.
+		 */
+		return;
+
+	icmsghdrp->status = error;
+
+	/*
+	 * If the error parameter is set, terminate the host's enumeration
+	 * on this pool.
+	 */
+	if (error) {
+		/*
+		 * Something failed or we have timedout;
+		 * terminate the current host-side iteration.
+		 */
+		goto response_done;
+	}
+
+	kvp_msg = (struct hv_kvp_msg *)
+			&recv_buffer[sizeof(struct vmbuspipe_hdr) +
+			sizeof(struct icmsg_hdr)];
+
+	switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
+	case KVP_OP_GET_IP_INFO:
+		ret = process_ob_ipinfo(msg_to_host,
+				 (struct hv_kvp_ip_msg *)kvp_msg,
+				 KVP_OP_GET_IP_INFO);
+		if (ret < 0)
+			icmsghdrp->status = HV_E_FAIL;
+
+		goto response_done;
+	case KVP_OP_SET_IP_INFO:
+		goto response_done;
+	case KVP_OP_GET:
+		kvp_data = &kvp_msg->body.kvp_get.data;
+		goto copy_value;
+
+	case KVP_OP_SET:
+	case KVP_OP_DELETE:
+		goto response_done;
+
+	default:
+		break;
+	}
+
+	kvp_data = &kvp_msg->body.kvp_enum_data.data;
+	key_name = msg_to_host->body.kvp_enum_data.data.key;
+
+	/*
+	 * The windows host expects the key/value pair to be encoded
+	 * in utf16. Ensure that the key/value size reported to the host
+	 * will be less than or equal to the MAX size (including the
+	 * terminating character).
+	 */
+	keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
+				(wchar_t *) kvp_data->key,
+				(HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
+	kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
+
+copy_value:
+	value = msg_to_host->body.kvp_enum_data.data.value;
+	valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
+				(wchar_t *) kvp_data->value,
+				(HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
+	kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
+
+	/*
+	 * If the utf8s to utf16s conversion failed; notify host
+	 * of the error.
+	 */
+	if ((keylen < 0) || (valuelen < 0))
+		icmsghdrp->status = HV_E_FAIL;
+
+	kvp_data->value_type = REG_SZ; /* all our values are strings */
+
+response_done:
+	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
+
+	vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
+				VM_PKT_DATA_INBAND, 0);
+	poll_channel(channel);
+}
+
+/*
+ * This callback is invoked when we get a KVP message from the host.
+ * The host ensures that only one KVP transaction can be active at a time.
+ * KVP implementation in Linux needs to forward the key to a user-mde
+ * component to retrive the corresponding value. Consequently, we cannot
+ * respond to the host in the conext of this callback. Since the host
+ * guarantees that at most only one transaction can be active at a time,
+ * we stash away the transaction state in a set of global variables.
+ */
+
+void hv_kvp_onchannelcallback(void *context)
+{
+	struct vmbus_channel *channel = context;
+	u32 recvlen;
+	u64 requestid;
+
+	struct hv_kvp_msg *kvp_msg;
+
+	struct icmsg_hdr *icmsghdrp;
+	struct icmsg_negotiate *negop = NULL;
+	int util_fw_version;
+	int kvp_srv_version;
+
+	if (kvp_transaction.active) {
+		/*
+		 * We will defer processing this callback once
+		 * the current transaction is complete.
+		 */
+		kvp_transaction.kvp_context = context;
+		return;
+	}
+
+	vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
+			 &requestid);
+
+	if (recvlen > 0) {
+		icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
+			sizeof(struct vmbuspipe_hdr)];
+
+		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+			/*
+			 * Based on the host, select appropriate
+			 * framework and service versions we will
+			 * negotiate.
+			 */
+			switch (vmbus_proto_version) {
+			case (VERSION_WS2008):
+				util_fw_version = UTIL_WS2K8_FW_VERSION;
+				kvp_srv_version = WS2008_SRV_VERSION;
+				break;
+			case (VERSION_WIN7):
+				util_fw_version = UTIL_FW_VERSION;
+				kvp_srv_version = WIN7_SRV_VERSION;
+				break;
+			default:
+				util_fw_version = UTIL_FW_VERSION;
+				kvp_srv_version = WIN8_SRV_VERSION;
+			}
+			vmbus_prep_negotiate_resp(icmsghdrp, negop,
+				 recv_buffer, util_fw_version,
+				 kvp_srv_version);
+
+		} else {
+			kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
+				sizeof(struct vmbuspipe_hdr) +
+				sizeof(struct icmsg_hdr)];
+
+			/*
+			 * Stash away this global state for completing the
+			 * transaction; note transactions are serialized.
+			 */
+
+			kvp_transaction.recv_len = recvlen;
+			kvp_transaction.recv_channel = channel;
+			kvp_transaction.recv_req_id = requestid;
+			kvp_transaction.active = true;
+			kvp_transaction.kvp_msg = kvp_msg;
+
+			/*
+			 * Get the information from the
+			 * user-mode component.
+			 * component. This transaction will be
+			 * completed when we get the value from
+			 * the user-mode component.
+			 * Set a timeout to deal with
+			 * user-mode not responding.
+			 */
+			schedule_work(&kvp_sendkey_work);
+			schedule_delayed_work(&kvp_work, 5*HZ);
+
+			return;
+
+		}
+
+		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+			| ICMSGHDRFLAG_RESPONSE;
+
+		vmbus_sendpacket(channel, recv_buffer,
+				       recvlen, requestid,
+				       VM_PKT_DATA_INBAND, 0);
+	}
+
+}
+
+int
+hv_kvp_init(struct hv_util_service *srv)
+{
+	int err;
+
+	err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback);
+	if (err)
+		return err;
+	recv_buffer = srv->recv_buffer;
+
+	/*
+	 * When this driver loads, the user level daemon that
+	 * processes the host requests may not yet be running.
+	 * Defer processing channel callbacks until the daemon
+	 * has registered.
+	 */
+	kvp_transaction.active = true;
+
+	return 0;
+}
+
+void hv_kvp_deinit(void)
+{
+	cn_del_callback(&kvp_id);
+	cancel_delayed_work_sync(&kvp_work);
+	cancel_work_sync(&kvp_sendkey_work);
+}