An implementation of key/value pair feature (KVP) for Linux on HyperV. In this version of the patch I have addressed all the comments I have received to date. I have also included the code for the user-level daemon here for your reference. Signed-off-by: K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
From: K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
Subject: An implementation of key/value pair feature (KVP) for Linux
on HyperV.
Signed-off-by: K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
Index: linux.trees.git/drivers/staging/hv/Makefile
===================================================================
--- linux.trees.git.orig/drivers/staging/hv/Makefile 2010-11-19 17:57:16.000000000 -0500
+++ linux.trees.git/drivers/staging/hv/Makefile 2010-11-19 17:57:17.000000000 -0500
@@ -10,4 +10,4 @@ hv_vmbus-y := vmbus_drv.o osd.o \
hv_storvsc-y := storvsc_drv.o storvsc.o
hv_blkvsc-y := blkvsc_drv.o blkvsc.o
hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
-hv_utils-y := hv_util.o
+hv_utils-y := hv_util.o hv_kvp.o
Index: linux.trees.git/drivers/staging/hv/utils.h
===================================================================
--- linux.trees.git.orig/drivers/staging/hv/utils.h 2010-11-19 17:30:48.000000000 -0500
+++ linux.trees.git/drivers/staging/hv/utils.h 2010-11-19 17:57:17.000000000 -0500
@@ -102,6 +102,7 @@ struct ictimesync_data{
#define HV_SHUTDOWN_MSG 0
#define HV_TIMESYNC_MSG 1
#define HV_HEARTBEAT_MSG 2
+#define HV_KVP_MSG 3
struct hyperv_service_callback {
u8 msg_type;
Index: linux.trees.git/drivers/staging/hv/hv_kvp.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux.trees.git/drivers/staging/hv/hv_kvp.c 2010-11-19 18:02:21.000000000 -0500
@@ -0,0 +1,356 @@
+/*
+ * An implementation of key value pair (KVP) functionality for Linux.
+ *
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
+ *
+ * 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.
+ *
+ */
+
+
+#include <linux/net.h>
+#include <linux/nls.h>
+#include <linux/connector.h>
+#include <linux/workqueue.h>
+
+#include "logging.h"
+#include "osd.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"
+
+
+
+/*
+ * 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 */
+ u8 *recv_buffer; /* the receive buffer that we allocated */
+ int recv_len; /* number of bytes received. */
+ struct vmbus_channel *recv_channel; /* chn we got the request */
+ u64 recv_req_id; /* request ID. */
+} kvp_transaction;
+
+static int kvp_send_key(int index);
+
+static void kvp_respond_to_host(char *key, char *value, int error);
+static void kvp_work_func(struct work_struct *dummy);
+static void kvp_register(void);
+
+static DECLARE_DELAYED_WORK(kvp_work, kvp_work_func);
+
+static struct cb_id kvp_id = { CN_KVP_IDX, CN_KVP_VAL };
+static const char kvp_name[] = "kvp_kernel_module";
+static int timeout_fired;
+
+/*
+ * Register the kernel component with the user-level daemon.
+ * As part of this registration, pass the LIC version number.
+ */
+
+static void
+kvp_register(void)
+{
+
+ struct cn_msg *msg;
+
+ msg = kzalloc(sizeof(*msg) + strlen(HV_DRV_VERSION) + 1 , GFP_ATOMIC);
+
+ if (msg) {
+ msg->id.idx = CN_KVP_IDX;
+ msg->id.val = CN_KVP_VAL;
+ msg->seq = KVP_REGISTER;
+ strcpy(msg->data, HV_DRV_VERSION);
+ msg->len = strlen(HV_DRV_VERSION) + 1;
+ cn_netlink_send(msg, 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("Unknown key", "Guest timed out", timeout_fired);
+ timeout_fired = 1;
+}
+
+/*
+ * Callback when data is received from user mode.
+ */
+
+static void
+kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+{
+ struct hv_ku_msg *message;
+
+ message = (struct hv_ku_msg *)msg->data;
+ if (msg->seq == KVP_REGISTER) {
+ printk(KERN_INFO "KVP: user-mode registering done.\n");
+ kvp_register();
+ }
+
+ if (msg->seq == KVP_USER_SET) {
+ /*
+ * 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->kvp_key,
+ message->kvp_value,
+ !strlen(message->kvp_key));
+ }
+}
+
+static int
+kvp_send_key(int index)
+{
+ struct cn_msg *msg;
+
+ msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
+
+ if (msg) {
+ msg->id.idx = CN_KVP_IDX;
+ msg->id.val = CN_KVP_VAL;
+ msg->seq = KVP_KERNEL_GET;
+ ((struct hv_ku_msg *)msg->data)->kvp_index = index;
+ msg->len = sizeof(struct hv_ku_msg);
+ cn_netlink_send(msg, 0, GFP_ATOMIC);
+ kfree(msg);
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Send a response back to the host.
+ */
+
+static void
+kvp_respond_to_host(char *key, char *value, int error)
+{
+ struct hv_kvp_msg *kvp_msg;
+ struct hv_kvp_msg_enumerate *kvp_data;
+ char *key_name;
+ struct icmsg_hdr *icmsghdrp;
+ int keylen, valuelen;
+ u8 *buf;
+ u32 buf_len;
+ struct vmbus_channel *channel;
+ u64 req_id;
+
+ /*
+ * If a transaction is not active; log and return.
+ */
+
+ if (!kvp_transaction.active) {
+ /*
+ * This is a spurious call!
+ */
+ printk(KERN_WARNING "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 = kvp_transaction.recv_buffer;
+ 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 *)&buf[sizeof(struct vmbuspipe_hdr)];
+ kvp_msg = (struct hv_kvp_msg *)&buf[sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+ kvp_data = &kvp_msg->kvp_data;
+ key_name = key;
+
+ /*
+ * If the error parameter is set, terminate the host's enumeration.
+ */
+ if (error) {
+ /*
+ * We don't support this index or the we have timedout;
+ * terminate the host-side iteration by returning an error.
+ */
+ icmsghdrp->status = HV_E_FAIL;
+ goto response_done;
+ }
+
+ /*
+ * The windows host expects the key/value pair to be encoded
+ * in utf16.
+ */
+ keylen = utf8s_to_utf16s(key_name, strlen(key_name),
+ (wchar_t *)kvp_data->data.key);
+ kvp_data->data.key_size = 2*(keylen + 1); /* utf16 encoding */
+ valuelen = utf8s_to_utf16s(value, strlen(value),
+ (wchar_t *)kvp_data->data.value);
+ kvp_data->data.value_size = 2*(valuelen + 1); /* utf16 encoding */
+
+ kvp_data->data.value_type = REG_SZ; /* all our values are strings */
+ icmsghdrp->status = HV_S_OK;
+
+response_done:
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, buf, buf_len, req_id,
+ VmbusPacketTypeDataInBand, 0);
+
+ /*
+ * Free up the buffer that was allocatted when we received a message
+ * from the host.
+ */
+ kfree(buf);
+}
+
+/*
+ * 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;
+ u8 *buf;
+ u32 buflen, recvlen;
+ u64 requestid;
+
+ struct hv_kvp_msg *kvp_msg;
+ struct hv_kvp_msg_enumerate *kvp_data;
+
+ struct icmsg_hdr *icmsghdrp;
+ struct icmsg_negotiate *negop = NULL;
+
+
+ buflen = PAGE_SIZE;
+ buf = kmalloc(buflen, GFP_ATOMIC);
+
+ vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
+
+ if (recvlen > 0) {
+ DPRINT_DBG(VMBUS, "KVP packet: len=%d, requestid=%lld",
+ recvlen, requestid);
+
+ icmsghdrp = (struct icmsg_hdr *)&buf[
+ sizeof(struct vmbuspipe_hdr)];
+
+ if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ prep_negotiate_resp(icmsghdrp, negop, buf);
+ } else {
+ kvp_msg = (struct hv_kvp_msg *)&buf[
+ sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ kvp_data = &kvp_msg->kvp_data;
+
+ /*
+ * We only support the "get" operation on
+ * "KVP_POOL_AUTO" pool.
+ */
+
+ if ((kvp_msg->kvp_hdr.pool != KVP_POOL_AUTO) ||
+ (kvp_msg->kvp_hdr.operation !=
+ KVP_OP_ENUMERATE) ||
+ kvp_transaction.active) {
+ if (kvp_transaction.active)
+ printk(KERN_WARNING
+ "KVP: Invalid call\n");
+ icmsghdrp->status = HV_E_FAIL;
+ goto callback_done;
+ }
+
+ /*
+ * Stash away this global state for completing the
+ * transaction; note transactions are serialized.
+ */
+ kvp_transaction.recv_buffer = buf;
+ kvp_transaction.recv_len = recvlen;
+ kvp_transaction.recv_channel = channel;
+ kvp_transaction.recv_req_id = requestid;
+ kvp_transaction.active = true;
+
+ /*
+ * 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.
+ */
+ kvp_send_key(kvp_data->index);
+ schedule_delayed_work(&kvp_work, 100);
+
+ return;
+
+ }
+
+callback_done:
+
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+ | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, buf,
+ recvlen, requestid,
+ VmbusPacketTypeDataInBand, 0);
+ }
+
+ kfree(buf);
+
+
+}
+
+int
+hv_kvp_init(void)
+{
+ int err;
+
+ err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+void hv_kvp_deinit(void)
+{
+ cn_del_callback(&kvp_id);
+ cancel_delayed_work_sync(&kvp_work);
+}
Index: linux.trees.git/drivers/staging/hv/hv_kvp.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux.trees.git/drivers/staging/hv/hv_kvp.h 2010-11-19 17:59:40.000000000 -0500
@@ -0,0 +1,184 @@
+/*
+ * An implementation of HyperV key value pair (KVP) functionality for Linux.
+ *
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
+ *
+ * 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.
+ *
+ */
+#ifndef _KVP_H
+#define _KVP_H_
+
+/*
+ * 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 compatability.
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ *
+ * The following definitions are shared with the user-mode component; do not
+ * change any of this without making the corresponding changes in
+ * the KVP user-mode component.
+ */
+
+#define CN_KVP_VAL 0x1 /* This supports queries from the kernel */
+#define CN_KVP_USER_VAL 0x2 /* This supports queries from the user */
+
+enum hv_ku_op {
+ KVP_REGISTER = 0, /* Register the user mode component */
+ KVP_KERNEL_GET, /* Kernel is requesting the value */
+ KVP_KERNEL_SET, /* Kernel is providing the value */
+ KVP_USER_GET, /* User is requesting the value */
+ KVP_USER_SET /* User is providing the value */
+};
+
+struct hv_ku_msg {
+ __u32 kvp_index; /* Key index */
+ __u8 kvp_key[HV_KVP_EXCHANGE_MAX_KEY_SIZE]; /* Key name */
+ __u8 kvp_value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE]; /* Key value */
+};
+
+
+
+
+#ifdef __KERNEL__
+
+/*
+ * Registry value types.
+ */
+
+#define REG_SZ 1
+
+enum hv_kvp_exchg_op {
+ KVP_OP_GET = 0,
+ KVP_OP_SET,
+ KVP_OP_DELETE,
+ KVP_OP_ENUMERATE,
+ 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. */
+};
+
+struct hv_kvp_hdr {
+ u8 operation;
+ u8 pool;
+};
+
+struct hv_kvp_exchg_msg_value {
+ u32 value_type;
+ u32 key_size;
+ u32 value_size;
+ u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+ u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
+};
+
+struct hv_kvp_msg_enumerate {
+ u32 index;
+ struct hv_kvp_exchg_msg_value data;
+};
+
+struct hv_kvp_msg {
+ struct hv_kvp_hdr kvp_hdr;
+ struct hv_kvp_msg_enumerate kvp_data;
+};
+
+int hv_kvp_init(void);
+void hv_kvp_deinit(void);
+void hv_kvp_onchannelcallback(void *);
+
+#endif /* __KERNEL__ */
+#endif /* _KVP_H */
+
Index: linux.trees.git/drivers/staging/hv/hv_util.c
===================================================================
--- linux.trees.git.orig/drivers/staging/hv/hv_util.c 2010-11-19 17:57:16.000000000 -0500
+++ linux.trees.git/drivers/staging/hv/hv_util.c 2010-11-19 17:57:17.000000000 -0500
@@ -37,6 +37,7 @@
#include "vmbus_private.h"
#include "vmbus_api.h"
#include "utils.h"
+#include "hv_kvp.h"
static void shutdown_onchannelcallback(void *context)
@@ -268,6 +269,10 @@ 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;
@@ -283,6 +288,11 @@ static int __init init_hyperv_utils(void
&heartbeat_onchannelcallback;
hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;
+ hv_cb_utils[HV_KVP_MSG].channel->OnChannelCallback =
+ &hv_kvp_onchannelcallback;
+
+
+
return 0;
}
@@ -301,6 +311,13 @@ static void exit_hyperv_utils(void)
hv_cb_utils[HV_HEARTBEAT_MSG].channel->OnChannelCallback =
&chn_cb_negotiate;
hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
+
+ hv_cb_utils[HV_KVP_MSG].channel->OnChannelCallback =
+ &chn_cb_negotiate;
+
+ hv_kvp_deinit();
+
+
}
module_init(init_hyperv_utils);
Index: linux.trees.git/drivers/staging/hv/channel_mgmt.c
===================================================================
--- linux.trees.git.orig/drivers/staging/hv/channel_mgmt.c 2010-11-19 17:30:48.000000000 -0500
+++ linux.trees.git/drivers/staging/hv/channel_mgmt.c 2010-11-19 18:00:40.000000000 -0500
@@ -34,8 +34,8 @@ struct vmbus_channel_message_table_entry
void (*messageHandler)(struct vmbus_channel_message_header *msg);
};
-#define MAX_MSG_TYPES 3
-#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 7
+#define MAX_MSG_TYPES 4
+#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
static const struct hv_guid
gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
@@ -98,6 +98,15 @@ static const struct hv_guid
0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
}
},
+ /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
+ /* KVP */
+ {
+ .data = {
+ 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
+ 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
+ }
+ },
+
};
@@ -231,6 +240,16 @@ struct hyperv_service_callback hv_cb_uti
.callback = chn_cb_negotiate,
.log_msg = "Heartbeat channel functionality initialized"
},
+ /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
+ /* KVP */
+ {
+ .data = {
+ 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
+ 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
+ },
+ .callback = chn_cb_negotiate,
+ .log_msg = "KVP channel functionality initialized"
+ },
};
EXPORT_SYMBOL(hv_cb_utils);
Attachment:
kvp_daemon.c
Description: Binary data
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