Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

14 files changed, 3158 insertions, 0 deletions

diff --git a/src/seastar/dpdk/examples/vm_power_manager/Makefile b/src/seastar/dpdk/examples/vm_power_manager/Makefile
new file mode 100644
index 00000000..59a96417
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/Makefile
@@ -0,0 +1,65 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ifneq ($(shell pkg-config --atleast-version=0.9.3 libvirt; echo $$?), 0)
+$(error vm_power_manager requires libvirt >= 0.9.3)
+else
+
+ifeq ($(RTE_SDK),)
+$(error "Please define RTE_SDK environment variable")
+endif
+
+# Default target, can be overridden by command line or environment
+RTE_TARGET ?= x86_64-native-linuxapp-gcc
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# binary name
+APP = vm_power_mgr
+
+# all source are stored in SRCS-y
+SRCS-y := main.c vm_power_cli.c power_manager.c channel_manager.c
+SRCS-y += channel_monitor.c
+
+CFLAGS += -O3 -I$(RTE_SDK)/lib/librte_power/
+CFLAGS += $(WERROR_FLAGS)
+
+LDLIBS += -lvirt
+
+# workaround for a gcc bug with noreturn attribute
+# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+CFLAGS_main.o += -Wno-return-type
+endif
+
+include $(RTE_SDK)/mk/rte.extapp.mk
+
+endif # libvirt check
diff --git a/src/seastar/dpdk/examples/vm_power_manager/channel_manager.c b/src/seastar/dpdk/examples/vm_power_manager/channel_manager.c
new file mode 100644
index 00000000..e068ae28
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/channel_manager.c
@@ -0,0 +1,806 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <sys/queue.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+
+#include <rte_malloc.h>
+#include <rte_memory.h>
+#include <rte_mempool.h>
+#include <rte_log.h>
+#include <rte_atomic.h>
+#include <rte_spinlock.h>
+
+#include <libvirt/libvirt.h>
+
+#include "channel_manager.h"
+#include "channel_commands.h"
+#include "channel_monitor.h"
+
+
+#define RTE_LOGTYPE_CHANNEL_MANAGER RTE_LOGTYPE_USER1
+
+#define ITERATIVE_BITMASK_CHECK_64(mask_u64b, i) \
+		for (i = 0; mask_u64b; mask_u64b &= ~(1ULL << i++)) \
+		if ((mask_u64b >> i) & 1) \
+
+/* Global pointer to libvirt connection */
+static virConnectPtr global_vir_conn_ptr;
+
+static unsigned char *global_cpumaps;
+static virVcpuInfo *global_vircpuinfo;
+static size_t global_maplen;
+
+static unsigned global_n_host_cpus;
+
+/*
+ * Represents a single Virtual Machine
+ */
+struct virtual_machine_info {
+	char name[CHANNEL_MGR_MAX_NAME_LEN];
+	rte_atomic64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS];
+	struct channel_info *channels[CHANNEL_CMDS_MAX_VM_CHANNELS];
+	uint64_t channel_mask;
+	uint8_t num_channels;
+	enum vm_status status;
+	virDomainPtr domainPtr;
+	virDomainInfo info;
+	rte_spinlock_t config_spinlock;
+	LIST_ENTRY(virtual_machine_info) vms_info;
+};
+
+LIST_HEAD(, virtual_machine_info) vm_list_head;
+
+static struct virtual_machine_info *
+find_domain_by_name(const char *name)
+{
+	struct virtual_machine_info *info;
+	LIST_FOREACH(info, &vm_list_head, vms_info) {
+		if (!strncmp(info->name, name, CHANNEL_MGR_MAX_NAME_LEN-1))
+			return info;
+	}
+	return NULL;
+}
+
+static int
+update_pcpus_mask(struct virtual_machine_info *vm_info)
+{
+	virVcpuInfoPtr cpuinfo;
+	unsigned i, j;
+	int n_vcpus;
+	uint64_t mask;
+
+	memset(global_cpumaps, 0, CHANNEL_CMDS_MAX_CPUS*global_maplen);
+
+	if (!virDomainIsActive(vm_info->domainPtr)) {
+		n_vcpus = virDomainGetVcpuPinInfo(vm_info->domainPtr,
+				vm_info->info.nrVirtCpu, global_cpumaps, global_maplen,
+				VIR_DOMAIN_AFFECT_CONFIG);
+		if (n_vcpus < 0) {
+			RTE_LOG(ERR, CHANNEL_MANAGER, "Error getting vCPU info for "
+					"in-active VM '%s'\n", vm_info->name);
+			return -1;
+		}
+		goto update_pcpus;
+	}
+
+	memset(global_vircpuinfo, 0, sizeof(*global_vircpuinfo)*
+			CHANNEL_CMDS_MAX_CPUS);
+
+	cpuinfo = global_vircpuinfo;
+
+	n_vcpus = virDomainGetVcpus(vm_info->domainPtr, cpuinfo,
+			CHANNEL_CMDS_MAX_CPUS, global_cpumaps, global_maplen);
+	if (n_vcpus < 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error getting vCPU info for "
+				"active VM '%s'\n", vm_info->name);
+		return -1;
+	}
+update_pcpus:
+	if (n_vcpus >= CHANNEL_CMDS_MAX_CPUS) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Number of vCPUS(%u) is out of range "
+				"0...%d\n", n_vcpus, CHANNEL_CMDS_MAX_CPUS-1);
+		return -1;
+	}
+	if (n_vcpus != vm_info->info.nrVirtCpu) {
+		RTE_LOG(INFO, CHANNEL_MANAGER, "Updating the number of vCPUs for VM '%s"
+				" from %d -> %d\n", vm_info->name, vm_info->info.nrVirtCpu,
+				n_vcpus);
+		vm_info->info.nrVirtCpu = n_vcpus;
+	}
+	for (i = 0; i < vm_info->info.nrVirtCpu; i++) {
+		mask = 0;
+		for (j = 0; j < global_n_host_cpus; j++) {
+			if (VIR_CPU_USABLE(global_cpumaps, global_maplen, i, j) > 0) {
+				mask |= 1ULL << j;
+			}
+		}
+		rte_atomic64_set(&vm_info->pcpu_mask[i], mask);
+	}
+	return 0;
+}
+
+int
+set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask)
+{
+	unsigned i = 0;
+	int flags = VIR_DOMAIN_AFFECT_LIVE|VIR_DOMAIN_AFFECT_CONFIG;
+	struct virtual_machine_info *vm_info;
+	uint64_t mask = core_mask;
+
+	if (vcpu >= CHANNEL_CMDS_MAX_CPUS) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "vCPU(%u) exceeds max allowable(%d)\n",
+				vcpu, CHANNEL_CMDS_MAX_CPUS-1);
+		return -1;
+	}
+
+	vm_info = find_domain_by_name(vm_name);
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "VM '%s' not found\n", vm_name);
+		return -1;
+	}
+
+	if (!virDomainIsActive(vm_info->domainPtr)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to set vCPU(%u) to pCPU "
+				"mask(0x%"PRIx64") for VM '%s', VM is not active\n",
+				vcpu, core_mask, vm_info->name);
+		return -1;
+	}
+
+	if (vcpu >= vm_info->info.nrVirtCpu) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "vCPU(%u) exceeds the assigned number of "
+				"vCPUs(%u)\n", vcpu, vm_info->info.nrVirtCpu);
+		return -1;
+	}
+	memset(global_cpumaps, 0 , CHANNEL_CMDS_MAX_CPUS * global_maplen);
+	ITERATIVE_BITMASK_CHECK_64(mask, i) {
+		VIR_USE_CPU(global_cpumaps, i);
+		if (i >= global_n_host_cpus) {
+			RTE_LOG(ERR, CHANNEL_MANAGER, "CPU(%u) exceeds the available "
+					"number of CPUs(%u)\n", i, global_n_host_cpus);
+			return -1;
+		}
+	}
+	if (virDomainPinVcpuFlags(vm_info->domainPtr, vcpu, global_cpumaps,
+			global_maplen, flags) < 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to set vCPU(%u) to pCPU "
+				"mask(0x%"PRIx64") for VM '%s'\n", vcpu, core_mask,
+				vm_info->name);
+		return -1;
+	}
+	rte_atomic64_set(&vm_info->pcpu_mask[vcpu], core_mask);
+	return 0;
+
+}
+
+int
+set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num)
+{
+	uint64_t mask = 1ULL << core_num;
+
+	return set_pcpus_mask(vm_name, vcpu, mask);
+}
+
+uint64_t
+get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu)
+{
+	struct virtual_machine_info *vm_info =
+			(struct virtual_machine_info *)chan_info->priv_info;
+	return rte_atomic64_read(&vm_info->pcpu_mask[vcpu]);
+}
+
+static inline int
+channel_exists(struct virtual_machine_info *vm_info, unsigned channel_num)
+{
+	rte_spinlock_lock(&(vm_info->config_spinlock));
+	if (vm_info->channel_mask & (1ULL << channel_num)) {
+		rte_spinlock_unlock(&(vm_info->config_spinlock));
+		return 1;
+	}
+	rte_spinlock_unlock(&(vm_info->config_spinlock));
+	return 0;
+}
+
+
+
+static int
+open_non_blocking_channel(struct channel_info *info)
+{
+	int ret, flags;
+	struct sockaddr_un sock_addr;
+	fd_set soc_fd_set;
+	struct timeval tv;
+
+	info->fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (info->fd == -1) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error(%s) creating socket for '%s'\n",
+				strerror(errno),
+				info->channel_path);
+		return -1;
+	}
+	sock_addr.sun_family = AF_UNIX;
+	memcpy(&sock_addr.sun_path, info->channel_path,
+			strlen(info->channel_path)+1);
+
+	/* Get current flags */
+	flags = fcntl(info->fd, F_GETFL, 0);
+	if (flags < 0) {
+		RTE_LOG(WARNING, CHANNEL_MANAGER, "Error(%s) fcntl get flags socket for"
+				"'%s'\n", strerror(errno), info->channel_path);
+		return 1;
+	}
+	/* Set to Non Blocking */
+	flags |= O_NONBLOCK;
+	if (fcntl(info->fd, F_SETFL, flags) < 0) {
+		RTE_LOG(WARNING, CHANNEL_MANAGER, "Error(%s) setting non-blocking "
+				"socket for '%s'\n", strerror(errno), info->channel_path);
+		return -1;
+	}
+	ret = connect(info->fd, (struct sockaddr *)&sock_addr,
+			sizeof(sock_addr));
+	if (ret < 0) {
+		/* ECONNREFUSED error is given when VM is not active */
+		if (errno == ECONNREFUSED) {
+			RTE_LOG(WARNING, CHANNEL_MANAGER, "VM is not active or has not "
+					"activated its endpoint to channel %s\n",
+					info->channel_path);
+			return -1;
+		}
+		/* Wait for tv_sec if in progress */
+		else if (errno == EINPROGRESS) {
+			tv.tv_sec = 2;
+			tv.tv_usec = 0;
+			FD_ZERO(&soc_fd_set);
+			FD_SET(info->fd, &soc_fd_set);
+			if (select(info->fd+1, NULL, &soc_fd_set, NULL, &tv) > 0) {
+				RTE_LOG(WARNING, CHANNEL_MANAGER, "Timeout or error on channel "
+						"'%s'\n", info->channel_path);
+				return -1;
+			}
+		} else {
+			/* Any other error */
+			RTE_LOG(WARNING, CHANNEL_MANAGER, "Error(%s) connecting socket"
+					" for '%s'\n", strerror(errno), info->channel_path);
+			return -1;
+		}
+	}
+	return 0;
+}
+
+static int
+setup_channel_info(struct virtual_machine_info **vm_info_dptr,
+		struct channel_info **chan_info_dptr, unsigned channel_num)
+{
+	struct channel_info *chan_info = *chan_info_dptr;
+	struct virtual_machine_info *vm_info = *vm_info_dptr;
+
+	chan_info->channel_num = channel_num;
+	chan_info->priv_info = (void *)vm_info;
+	chan_info->status = CHANNEL_MGR_CHANNEL_DISCONNECTED;
+	if (open_non_blocking_channel(chan_info) < 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Could not open channel: "
+				"'%s' for VM '%s'\n",
+				chan_info->channel_path, vm_info->name);
+		return -1;
+	}
+	if (add_channel_to_monitor(&chan_info) < 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Could add channel: "
+				"'%s' to epoll ctl for VM '%s'\n",
+				chan_info->channel_path, vm_info->name);
+		return -1;
+
+	}
+	rte_spinlock_lock(&(vm_info->config_spinlock));
+	vm_info->num_channels++;
+	vm_info->channel_mask |= 1ULL << channel_num;
+	vm_info->channels[channel_num] = chan_info;
+	chan_info->status = CHANNEL_MGR_CHANNEL_CONNECTED;
+	rte_spinlock_unlock(&(vm_info->config_spinlock));
+	return 0;
+}
+
+int
+add_all_channels(const char *vm_name)
+{
+	DIR *d;
+	struct dirent *dir;
+	struct virtual_machine_info *vm_info;
+	struct channel_info *chan_info;
+	char *token, *remaining, *tail_ptr;
+	char socket_name[PATH_MAX];
+	unsigned channel_num;
+	int num_channels_enabled = 0;
+
+	/* verify VM exists */
+	vm_info = find_domain_by_name(vm_name);
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "VM: '%s' not found"
+				" during channel discovery\n", vm_name);
+		return 0;
+	}
+	if (!virDomainIsActive(vm_info->domainPtr)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "VM: '%s' is not active\n", vm_name);
+		vm_info->status = CHANNEL_MGR_VM_INACTIVE;
+		return 0;
+	}
+	d = opendir(CHANNEL_MGR_SOCKET_PATH);
+	if (d == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error opening directory '%s': %s\n",
+				CHANNEL_MGR_SOCKET_PATH, strerror(errno));
+		return -1;
+	}
+	while ((dir = readdir(d)) != NULL) {
+		if (!strncmp(dir->d_name, ".", 1) ||
+				!strncmp(dir->d_name, "..", 2))
+			continue;
+
+		snprintf(socket_name, sizeof(socket_name), "%s", dir->d_name);
+		remaining = socket_name;
+		/* Extract vm_name from "<vm_name>.<channel_num>" */
+		token = strsep(&remaining, ".");
+		if (remaining == NULL)
+			continue;
+		if (strncmp(vm_name, token, CHANNEL_MGR_MAX_NAME_LEN))
+			continue;
+
+		/* remaining should contain only <channel_num> */
+		errno = 0;
+		channel_num = (unsigned)strtol(remaining, &tail_ptr, 0);
+		if ((errno != 0) || (remaining[0] == '\0') ||
+				tail_ptr == NULL || (*tail_ptr != '\0')) {
+			RTE_LOG(WARNING, CHANNEL_MANAGER, "Malformed channel name"
+					"'%s' found it should be in the form of "
+					"'<guest_name>.<channel_num>(decimal)'\n",
+					dir->d_name);
+			continue;
+		}
+		if (channel_num >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
+			RTE_LOG(WARNING, CHANNEL_MANAGER, "Channel number(%u) is "
+					"greater than max allowable: %d, skipping '%s%s'\n",
+					channel_num, CHANNEL_CMDS_MAX_VM_CHANNELS-1,
+					CHANNEL_MGR_SOCKET_PATH, dir->d_name);
+			continue;
+		}
+		/* if channel has not been added previously */
+		if (channel_exists(vm_info, channel_num))
+			continue;
+
+		chan_info = rte_malloc(NULL, sizeof(*chan_info),
+				RTE_CACHE_LINE_SIZE);
+		if (chan_info == NULL) {
+			RTE_LOG(ERR, CHANNEL_MANAGER, "Error allocating memory for "
+				"channel '%s%s'\n", CHANNEL_MGR_SOCKET_PATH, dir->d_name);
+			continue;
+		}
+
+		snprintf(chan_info->channel_path,
+				sizeof(chan_info->channel_path), "%s%s",
+				CHANNEL_MGR_SOCKET_PATH, dir->d_name);
+
+		if (setup_channel_info(&vm_info, &chan_info, channel_num) < 0) {
+			rte_free(chan_info);
+			continue;
+		}
+
+		num_channels_enabled++;
+	}
+	closedir(d);
+	return num_channels_enabled;
+}
+
+int
+add_channels(const char *vm_name, unsigned *channel_list,
+		unsigned len_channel_list)
+{
+	struct virtual_machine_info *vm_info;
+	struct channel_info *chan_info;
+	char socket_path[PATH_MAX];
+	unsigned i;
+	int num_channels_enabled = 0;
+
+	vm_info = find_domain_by_name(vm_name);
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to add channels: VM '%s' "
+				"not found\n", vm_name);
+		return 0;
+	}
+
+	if (!virDomainIsActive(vm_info->domainPtr)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "VM: '%s' is not active\n", vm_name);
+		vm_info->status = CHANNEL_MGR_VM_INACTIVE;
+		return 0;
+	}
+
+	for (i = 0; i < len_channel_list; i++) {
+
+		if (channel_list[i] >= CHANNEL_CMDS_MAX_VM_CHANNELS) {
+			RTE_LOG(INFO, CHANNEL_MANAGER, "Channel(%u) is out of range "
+							"0...%d\n", channel_list[i],
+							CHANNEL_CMDS_MAX_VM_CHANNELS-1);
+			continue;
+		}
+		if (channel_exists(vm_info, channel_list[i])) {
+			RTE_LOG(INFO, CHANNEL_MANAGER, "Channel already exists, skipping  "
+					"'%s.%u'\n", vm_name, i);
+			continue;
+		}
+
+		snprintf(socket_path, sizeof(socket_path), "%s%s.%u",
+				CHANNEL_MGR_SOCKET_PATH, vm_name, channel_list[i]);
+		errno = 0;
+		if (access(socket_path, F_OK) < 0) {
+			RTE_LOG(ERR, CHANNEL_MANAGER, "Channel path '%s' error: "
+					"%s\n", socket_path, strerror(errno));
+			continue;
+		}
+		chan_info = rte_malloc(NULL, sizeof(*chan_info),
+				RTE_CACHE_LINE_SIZE);
+		if (chan_info == NULL) {
+			RTE_LOG(ERR, CHANNEL_MANAGER, "Error allocating memory for "
+					"channel '%s'\n", socket_path);
+			continue;
+		}
+		snprintf(chan_info->channel_path,
+				sizeof(chan_info->channel_path), "%s%s.%u",
+				CHANNEL_MGR_SOCKET_PATH, vm_name, channel_list[i]);
+		if (setup_channel_info(&vm_info, &chan_info, channel_list[i]) < 0) {
+			rte_free(chan_info);
+			continue;
+		}
+		num_channels_enabled++;
+
+	}
+	return num_channels_enabled;
+}
+
+int
+remove_channel(struct channel_info **chan_info_dptr)
+{
+	struct virtual_machine_info *vm_info;
+	struct channel_info *chan_info = *chan_info_dptr;
+
+	close(chan_info->fd);
+
+	vm_info = (struct virtual_machine_info *)chan_info->priv_info;
+
+	rte_spinlock_lock(&(vm_info->config_spinlock));
+	vm_info->channel_mask &= ~(1ULL << chan_info->channel_num);
+	vm_info->num_channels--;
+	rte_spinlock_unlock(&(vm_info->config_spinlock));
+
+	rte_free(chan_info);
+	return 0;
+}
+
+int
+set_channel_status_all(const char *vm_name, enum channel_status status)
+{
+	struct virtual_machine_info *vm_info;
+	unsigned i;
+	uint64_t mask;
+	int num_channels_changed = 0;
+
+	if (!(status == CHANNEL_MGR_CHANNEL_CONNECTED ||
+			status == CHANNEL_MGR_CHANNEL_DISABLED)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Channels can only be enabled or "
+				"disabled: Unable to change status for VM '%s'\n", vm_name);
+	}
+	vm_info = find_domain_by_name(vm_name);
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to disable channels: VM '%s' "
+				"not found\n", vm_name);
+		return 0;
+	}
+
+	rte_spinlock_lock(&(vm_info->config_spinlock));
+	mask = vm_info->channel_mask;
+	ITERATIVE_BITMASK_CHECK_64(mask, i) {
+		vm_info->channels[i]->status = status;
+		num_channels_changed++;
+	}
+	rte_spinlock_unlock(&(vm_info->config_spinlock));
+	return num_channels_changed;
+
+}
+
+int
+set_channel_status(const char *vm_name, unsigned *channel_list,
+		unsigned len_channel_list, enum channel_status status)
+{
+	struct virtual_machine_info *vm_info;
+	unsigned i;
+	int num_channels_changed = 0;
+
+	if (!(status == CHANNEL_MGR_CHANNEL_CONNECTED ||
+			status == CHANNEL_MGR_CHANNEL_DISABLED)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Channels can only be enabled or "
+				"disabled: Unable to change status for VM '%s'\n", vm_name);
+	}
+	vm_info = find_domain_by_name(vm_name);
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to add channels: VM '%s' "
+				"not found\n", vm_name);
+		return 0;
+	}
+	for (i = 0; i < len_channel_list; i++) {
+		if (channel_exists(vm_info, channel_list[i])) {
+			rte_spinlock_lock(&(vm_info->config_spinlock));
+			vm_info->channels[channel_list[i]]->status = status;
+			rte_spinlock_unlock(&(vm_info->config_spinlock));
+			num_channels_changed++;
+		}
+	}
+	return num_channels_changed;
+}
+
+int
+get_info_vm(const char *vm_name, struct vm_info *info)
+{
+	struct virtual_machine_info *vm_info;
+	unsigned i, channel_num = 0;
+	uint64_t mask;
+
+	vm_info = find_domain_by_name(vm_name);
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "VM '%s' not found\n", vm_name);
+		return -1;
+	}
+	info->status = CHANNEL_MGR_VM_ACTIVE;
+	if (!virDomainIsActive(vm_info->domainPtr))
+		info->status = CHANNEL_MGR_VM_INACTIVE;
+
+	rte_spinlock_lock(&(vm_info->config_spinlock));
+
+	mask = vm_info->channel_mask;
+	ITERATIVE_BITMASK_CHECK_64(mask, i) {
+		info->channels[channel_num].channel_num = i;
+		memcpy(info->channels[channel_num].channel_path,
+				vm_info->channels[i]->channel_path, UNIX_PATH_MAX);
+		info->channels[channel_num].status = vm_info->channels[i]->status;
+		info->channels[channel_num].fd = vm_info->channels[i]->fd;
+		channel_num++;
+	}
+
+	info->num_channels = channel_num;
+	info->num_vcpus = vm_info->info.nrVirtCpu;
+	rte_spinlock_unlock(&(vm_info->config_spinlock));
+
+	memcpy(info->name, vm_info->name, sizeof(vm_info->name));
+	for (i = 0; i < info->num_vcpus; i++) {
+		info->pcpu_mask[i] = rte_atomic64_read(&vm_info->pcpu_mask[i]);
+	}
+	return 0;
+}
+
+int
+add_vm(const char *vm_name)
+{
+	struct virtual_machine_info *new_domain;
+	virDomainPtr dom_ptr;
+	int i;
+
+	if (find_domain_by_name(vm_name) != NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to add VM: VM '%s' "
+				"already exists\n", vm_name);
+		return -1;
+	}
+
+	if (global_vir_conn_ptr == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "No connection to hypervisor exists\n");
+		return -1;
+	}
+	dom_ptr = virDomainLookupByName(global_vir_conn_ptr, vm_name);
+	if (dom_ptr == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error on VM lookup with libvirt: "
+				"VM '%s' not found\n", vm_name);
+		return -1;
+	}
+
+	new_domain = rte_malloc("virtual_machine_info", sizeof(*new_domain),
+			RTE_CACHE_LINE_SIZE);
+	if (new_domain == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to allocate memory for VM "
+				"info\n");
+		return -1;
+	}
+	new_domain->domainPtr = dom_ptr;
+	if (virDomainGetInfo(new_domain->domainPtr, &new_domain->info) != 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to get libvirt VM info\n");
+		rte_free(new_domain);
+		return -1;
+	}
+	if (new_domain->info.nrVirtCpu > CHANNEL_CMDS_MAX_CPUS) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error the number of virtual CPUs(%u) is "
+				"greater than allowable(%d)\n", new_domain->info.nrVirtCpu,
+				CHANNEL_CMDS_MAX_CPUS);
+		rte_free(new_domain);
+		return -1;
+	}
+
+	for (i = 0; i < CHANNEL_CMDS_MAX_CPUS; i++) {
+		rte_atomic64_init(&new_domain->pcpu_mask[i]);
+	}
+	if (update_pcpus_mask(new_domain) < 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error getting physical CPU pinning\n");
+		rte_free(new_domain);
+		return -1;
+	}
+	strncpy(new_domain->name, vm_name, sizeof(new_domain->name));
+	new_domain->name[sizeof(new_domain->name) - 1] = '\0';
+	new_domain->channel_mask = 0;
+	new_domain->num_channels = 0;
+
+	if (!virDomainIsActive(dom_ptr))
+		new_domain->status = CHANNEL_MGR_VM_INACTIVE;
+	else
+		new_domain->status = CHANNEL_MGR_VM_ACTIVE;
+
+	rte_spinlock_init(&(new_domain->config_spinlock));
+	LIST_INSERT_HEAD(&vm_list_head, new_domain, vms_info);
+	return 0;
+}
+
+int
+remove_vm(const char *vm_name)
+{
+	struct virtual_machine_info *vm_info = find_domain_by_name(vm_name);
+
+	if (vm_info == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to remove VM: VM '%s' "
+				"not found\n", vm_name);
+		return -1;
+	}
+	rte_spinlock_lock(&vm_info->config_spinlock);
+	if (vm_info->num_channels != 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to remove VM '%s', there are "
+				"%"PRId8" channels still active\n",
+				vm_name, vm_info->num_channels);
+		rte_spinlock_unlock(&vm_info->config_spinlock);
+		return -1;
+	}
+	LIST_REMOVE(vm_info, vms_info);
+	rte_spinlock_unlock(&vm_info->config_spinlock);
+	rte_free(vm_info);
+	return 0;
+}
+
+static void
+disconnect_hypervisor(void)
+{
+	if (global_vir_conn_ptr != NULL) {
+		virConnectClose(global_vir_conn_ptr);
+		global_vir_conn_ptr = NULL;
+	}
+}
+
+static int
+connect_hypervisor(const char *path)
+{
+	if (global_vir_conn_ptr != NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error connecting to %s, connection "
+				"already established\n", path);
+		return -1;
+	}
+	global_vir_conn_ptr = virConnectOpen(path);
+	if (global_vir_conn_ptr == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error failed to open connection to "
+				"Hypervisor '%s'\n", path);
+		return -1;
+	}
+	return 0;
+}
+
+int
+channel_manager_init(const char *path)
+{
+	virNodeInfo info;
+
+	LIST_INIT(&vm_list_head);
+	if (connect_hypervisor(path) < 0) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to initialize channel manager\n");
+		return -1;
+	}
+
+	global_maplen = VIR_CPU_MAPLEN(CHANNEL_CMDS_MAX_CPUS);
+
+	global_vircpuinfo = rte_zmalloc(NULL, sizeof(*global_vircpuinfo) *
+			CHANNEL_CMDS_MAX_CPUS, RTE_CACHE_LINE_SIZE);
+	if (global_vircpuinfo == NULL) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Error allocating memory for CPU Info\n");
+		goto error;
+	}
+	global_cpumaps = rte_zmalloc(NULL, CHANNEL_CMDS_MAX_CPUS * global_maplen,
+			RTE_CACHE_LINE_SIZE);
+	if (global_cpumaps == NULL) {
+		goto error;
+	}
+
+	if (virNodeGetInfo(global_vir_conn_ptr, &info)) {
+		RTE_LOG(ERR, CHANNEL_MANAGER, "Unable to retrieve node Info\n");
+		goto error;
+	}
+
+	global_n_host_cpus = (unsigned)info.cpus;
+
+	if (global_n_host_cpus > CHANNEL_CMDS_MAX_CPUS) {
+		RTE_LOG(WARNING, CHANNEL_MANAGER, "The number of host CPUs(%u) exceeds the "
+				"maximum of %u. No cores over %u should be used.\n",
+				global_n_host_cpus, CHANNEL_CMDS_MAX_CPUS,
+				CHANNEL_CMDS_MAX_CPUS - 1);
+		global_n_host_cpus = CHANNEL_CMDS_MAX_CPUS;
+	}
+
+	return 0;
+error:
+	disconnect_hypervisor();
+	return -1;
+}
+
+void
+channel_manager_exit(void)
+{
+	unsigned i;
+	uint64_t mask;
+	struct virtual_machine_info *vm_info;
+
+	LIST_FOREACH(vm_info, &vm_list_head, vms_info) {
+
+		rte_spinlock_lock(&(vm_info->config_spinlock));
+
+		mask = vm_info->channel_mask;
+		ITERATIVE_BITMASK_CHECK_64(mask, i) {
+			remove_channel_from_monitor(vm_info->channels[i]);
+			close(vm_info->channels[i]->fd);
+			rte_free(vm_info->channels[i]);
+		}
+		rte_spinlock_unlock(&(vm_info->config_spinlock));
+
+		LIST_REMOVE(vm_info, vms_info);
+		rte_free(vm_info);
+	}
+
+	rte_free(global_cpumaps);
+	rte_free(global_vircpuinfo);
+	disconnect_hypervisor();
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/channel_manager.h b/src/seastar/dpdk/examples/vm_power_manager/channel_manager.h
new file mode 100644
index 00000000..47c3b9cd
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/channel_manager.h
@@ -0,0 +1,326 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CHANNEL_MANAGER_H_
+#define CHANNEL_MANAGER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <linux/limits.h>
+#include <sys/un.h>
+#include <rte_atomic.h>
+
+/* Maximum number of CPUs */
+#define CHANNEL_CMDS_MAX_CPUS        64
+#if CHANNEL_CMDS_MAX_CPUS > 64
+#error Maximum number of cores is 64, overflow is guaranteed to \
+    cause problems with VM Power Management
+#endif
+
+/* Maximum name length including '\0' terminator */
+#define CHANNEL_MGR_MAX_NAME_LEN    64
+
+/* Maximum number of channels to each Virtual Machine */
+#define CHANNEL_MGR_MAX_CHANNELS    64
+
+/* Hypervisor Path for libvirt(qemu/KVM) */
+#define CHANNEL_MGR_DEFAULT_HV_PATH "qemu:///system"
+
+/* File socket directory */
+#define CHANNEL_MGR_SOCKET_PATH     "/tmp/powermonitor/"
+
+#ifndef UNIX_PATH_MAX
+struct sockaddr_un _sockaddr_un;
+#define UNIX_PATH_MAX sizeof(_sockaddr_un.sun_path)
+#endif
+
+/* Communication Channel Status */
+enum channel_status { CHANNEL_MGR_CHANNEL_DISCONNECTED = 0,
+	CHANNEL_MGR_CHANNEL_CONNECTED,
+	CHANNEL_MGR_CHANNEL_DISABLED,
+	CHANNEL_MGR_CHANNEL_PROCESSING};
+
+/* VM libvirt(qemu/KVM) connection status */
+enum vm_status { CHANNEL_MGR_VM_INACTIVE = 0, CHANNEL_MGR_VM_ACTIVE};
+
+/*
+ *  Represents a single and exclusive VM channel that exists between a guest and
+ *  the host.
+ */
+struct channel_info {
+	char channel_path[UNIX_PATH_MAX]; /**< Path to host socket */
+	volatile uint32_t status;    /**< Connection status(enum channel_status) */
+	int fd;                      /**< AF_UNIX socket fd */
+	unsigned channel_num;        /**< CHANNEL_MGR_SOCKET_PATH/<vm_name>.channel_num */
+	void *priv_info;             /**< Pointer to private info, do not modify */
+};
+
+/* Represents a single VM instance used to return internal information about
+ * a VM */
+struct vm_info {
+	char name[CHANNEL_MGR_MAX_NAME_LEN];          /**< VM name */
+	enum vm_status status;                        /**< libvirt status */
+	uint64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS];    /**< pCPU mask for each vCPU */
+	unsigned num_vcpus;                           /**< number of vCPUS */
+	struct channel_info channels[CHANNEL_MGR_MAX_CHANNELS]; /**< Array of channel_info */
+	unsigned num_channels;                        /**< Number of channels */
+};
+
+/**
+ * Initialize the Channel Manager resources and connect to the Hypervisor
+ * specified in path.
+ * This must be successfully called first before calling any other functions.
+ * It must only be call once;
+ *
+ * @param path
+ *  Must be a local path, e.g. qemu:///system.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int channel_manager_init(const char *path);
+
+/**
+ * Free resources associated with the Channel Manager.
+ *
+ * @param path
+ *  Must be a local path, e.g. qemu:///system.
+ *
+ * @return
+ *  None
+ */
+void channel_manager_exit(void);
+
+/**
+ * Get the Physical CPU mask for VM lcore channel(vcpu), result is assigned to
+ * core_mask.
+ * It is not thread-safe.
+ *
+ * @param chan_info
+ *  Pointer to struct channel_info
+ *
+ * @param vcpu
+ *  The virtual CPU to query.
+ *
+ *
+ * @return
+ *  - 0 on error.
+ *  - >0 on success.
+ */
+uint64_t get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu);
+
+/**
+ * Set the Physical CPU mask for the specified vCPU.
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to lookup
+ *
+ * @param vcpu
+ *  The virtual CPU to set.
+ *
+ * @param core_mask
+ *  The core mask of the physical CPU(s) to bind the vCPU
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask);
+
+/**
+ * Set the Physical CPU for the specified vCPU.
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to lookup
+ *
+ * @param vcpu
+ *  The virtual CPU to set.
+ *
+ * @param core_num
+ *  The core number of the physical CPU(s) to bind the vCPU
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num);
+/**
+ * Add a VM as specified by name to the Channel Manager. The name must
+ * correspond to a valid libvirt domain name.
+ * This is required prior to adding channels.
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to lookup.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int add_vm(const char *name);
+
+/**
+ * Remove a previously added Virtual Machine from the Channel Manager
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to lookup.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int remove_vm(const char *name);
+
+/**
+ * Add all available channels to the VM as specified by name.
+ * Channels in the form of paths
+ * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to lookup.
+ *
+ * @return
+ *  - N the number of channels added for the VM
+ */
+int add_all_channels(const char *vm_name);
+
+/**
+ * Add the channel numbers in channel_list to the domain specified by name.
+ * Channels in the form of paths
+ * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to add channels.
+ *
+ * @param channel_list
+ *  Pointer to list of unsigned integers, representing the channel number to add
+ *  It must be allocated outside of this function.
+ *
+ * @param num_channels
+ *  The amount of channel numbers in channel_list
+ *
+ * @return
+ *  - N the number of channels added for the VM
+ *  - 0 for error
+ */
+int add_channels(const char *vm_name, unsigned *channel_list,
+		unsigned num_channels);
+
+/**
+ * Remove a channel definition from the channel manager. This must only be
+ * called from the channel monitor thread.
+ *
+ * @param chan_info
+ *  Pointer to a valid struct channel_info.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int remove_channel(struct channel_info **chan_info_dptr);
+
+/**
+ * For all channels associated with a Virtual Machine name, update the
+ * connection status. Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
+ * CHANNEL_MGR_CHANNEL_DISABLED only.
+ *
+ *
+ * @param name
+ *  Virtual Machine name to modify all channels.
+ *
+ * @param status
+ *  The status to set each channel
+ *
+ * @param num_channels
+ *  The amount of channel numbers in channel_list
+ *
+ * @return
+ *  - N the number of channels added for the VM
+ *  - 0 for error
+ */
+int set_channel_status_all(const char *name, enum channel_status status);
+
+/**
+ * For all channels in channel_list associated with a Virtual Machine name
+ * update the connection status of each.
+ * Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
+ * CHANNEL_MGR_CHANNEL_DISABLED only.
+ * It is not thread-safe.
+ *
+ * @param name
+ *  Virtual Machine name to add channels.
+ *
+ * @param channel_list
+ *  Pointer to list of unsigned integers, representing the channel numbers to
+ *  modify.
+ *  It must be allocated outside of this function.
+ *
+ * @param num_channels
+ *  The amount of channel numbers in channel_list
+ *
+ * @return
+ *  - N the number of channels modified for the VM
+ *  - 0 for error
+ */
+int set_channel_status(const char *vm_name, unsigned *channel_list,
+		unsigned len_channel_list, enum channel_status status);
+
+/**
+ * Populates a pointer to struct vm_info associated with vm_name.
+ *
+ * @param vm_name
+ *  The name of the virtual machine to lookup.
+ *
+ *  @param vm_info
+ *   Pointer to a struct vm_info, this must be allocated prior to calling this
+ *   function.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int get_info_vm(const char *vm_name, struct vm_info *info);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CHANNEL_MANAGER_H_ */
diff --git a/src/seastar/dpdk/examples/vm_power_manager/channel_monitor.c b/src/seastar/dpdk/examples/vm_power_manager/channel_monitor.c
new file mode 100644
index 00000000..e7f5cc4a
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/channel_monitor.c
@@ -0,0 +1,233 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/epoll.h>
+#include <sys/queue.h>
+
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_malloc.h>
+#include <rte_atomic.h>
+
+
+#include "channel_monitor.h"
+#include "channel_commands.h"
+#include "channel_manager.h"
+#include "power_manager.h"
+
+#define RTE_LOGTYPE_CHANNEL_MONITOR RTE_LOGTYPE_USER1
+
+#define MAX_EVENTS 256
+
+
+static volatile unsigned run_loop = 1;
+static int global_event_fd;
+static struct epoll_event *global_events_list;
+
+void channel_monitor_exit(void)
+{
+	run_loop = 0;
+	rte_free(global_events_list);
+}
+
+static int
+process_request(struct channel_packet *pkt, struct channel_info *chan_info)
+{
+	uint64_t core_mask;
+
+	if (chan_info == NULL)
+		return -1;
+
+	if (rte_atomic32_cmpset(&(chan_info->status), CHANNEL_MGR_CHANNEL_CONNECTED,
+			CHANNEL_MGR_CHANNEL_PROCESSING) == 0)
+		return -1;
+
+	if (pkt->command == CPU_POWER) {
+		core_mask = get_pcpus_mask(chan_info, pkt->resource_id);
+		if (core_mask == 0) {
+			RTE_LOG(ERR, CHANNEL_MONITOR, "Error get physical CPU mask for "
+				"channel '%s' using vCPU(%u)\n", chan_info->channel_path,
+				(unsigned)pkt->unit);
+			return -1;
+		}
+		if (__builtin_popcountll(core_mask) == 1) {
+
+			unsigned core_num = __builtin_ffsll(core_mask) - 1;
+
+			switch (pkt->unit) {
+			case(CPU_POWER_SCALE_MIN):
+					power_manager_scale_core_min(core_num);
+			break;
+			case(CPU_POWER_SCALE_MAX):
+					power_manager_scale_core_max(core_num);
+			break;
+			case(CPU_POWER_SCALE_DOWN):
+					power_manager_scale_core_down(core_num);
+			break;
+			case(CPU_POWER_SCALE_UP):
+					power_manager_scale_core_up(core_num);
+			break;
+			default:
+				break;
+			}
+		} else {
+			switch (pkt->unit) {
+			case(CPU_POWER_SCALE_MIN):
+					power_manager_scale_mask_min(core_mask);
+			break;
+			case(CPU_POWER_SCALE_MAX):
+					power_manager_scale_mask_max(core_mask);
+			break;
+			case(CPU_POWER_SCALE_DOWN):
+					power_manager_scale_mask_down(core_mask);
+			break;
+			case(CPU_POWER_SCALE_UP):
+					power_manager_scale_mask_up(core_mask);
+			break;
+			default:
+				break;
+			}
+
+		}
+	}
+	/* Return is not checked as channel status may have been set to DISABLED
+	 * from management thread
+	 */
+	rte_atomic32_cmpset(&(chan_info->status), CHANNEL_MGR_CHANNEL_PROCESSING,
+			CHANNEL_MGR_CHANNEL_CONNECTED);
+	return 0;
+
+}
+
+int
+add_channel_to_monitor(struct channel_info **chan_info)
+{
+	struct channel_info *info = *chan_info;
+	struct epoll_event event;
+
+	event.events = EPOLLIN;
+	event.data.ptr = info;
+	if (epoll_ctl(global_event_fd, EPOLL_CTL_ADD, info->fd, &event) < 0) {
+		RTE_LOG(ERR, CHANNEL_MONITOR, "Unable to add channel '%s' "
+				"to epoll\n", info->channel_path);
+		return -1;
+	}
+	return 0;
+}
+
+int
+remove_channel_from_monitor(struct channel_info *chan_info)
+{
+	if (epoll_ctl(global_event_fd, EPOLL_CTL_DEL, chan_info->fd, NULL) < 0) {
+		RTE_LOG(ERR, CHANNEL_MONITOR, "Unable to remove channel '%s' "
+				"from epoll\n", chan_info->channel_path);
+		return -1;
+	}
+	return 0;
+}
+
+int
+channel_monitor_init(void)
+{
+	global_event_fd = epoll_create1(0);
+	if (global_event_fd == 0) {
+		RTE_LOG(ERR, CHANNEL_MONITOR, "Error creating epoll context with "
+				"error %s\n", strerror(errno));
+		return -1;
+	}
+	global_events_list = rte_malloc("epoll_events", sizeof(*global_events_list)
+			* MAX_EVENTS, RTE_CACHE_LINE_SIZE);
+	if (global_events_list == NULL) {
+		RTE_LOG(ERR, CHANNEL_MONITOR, "Unable to rte_malloc for "
+				"epoll events\n");
+		return -1;
+	}
+	return 0;
+}
+
+void
+run_channel_monitor(void)
+{
+	while (run_loop) {
+		int n_events, i;
+
+		n_events = epoll_wait(global_event_fd, global_events_list,
+				MAX_EVENTS, 1);
+		if (!run_loop)
+			break;
+		for (i = 0; i < n_events; i++) {
+			struct channel_info *chan_info = (struct channel_info *)
+					global_events_list[i].data.ptr;
+			if ((global_events_list[i].events & EPOLLERR) ||
+					(global_events_list[i].events & EPOLLHUP)) {
+				RTE_LOG(DEBUG, CHANNEL_MONITOR, "Remote closed connection for "
+						"channel '%s'\n", chan_info->channel_path);
+				remove_channel(&chan_info);
+				continue;
+			}
+			if (global_events_list[i].events & EPOLLIN) {
+
+				int n_bytes, err = 0;
+				struct channel_packet pkt;
+				void *buffer = &pkt;
+				int buffer_len = sizeof(pkt);
+
+				while (buffer_len > 0) {
+					n_bytes = read(chan_info->fd, buffer, buffer_len);
+					if (n_bytes == buffer_len)
+						break;
+					if (n_bytes == -1) {
+						err = errno;
+						RTE_LOG(DEBUG, CHANNEL_MONITOR, "Received error on "
+								"channel '%s' read: %s\n",
+								chan_info->channel_path, strerror(err));
+						remove_channel(&chan_info);
+						break;
+					}
+					buffer = (char *)buffer + n_bytes;
+					buffer_len -= n_bytes;
+				}
+				if (!err)
+					process_request(&pkt, chan_info);
+			}
+		}
+	}
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/channel_monitor.h b/src/seastar/dpdk/examples/vm_power_manager/channel_monitor.h
new file mode 100644
index 00000000..c1386079
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/channel_monitor.h
@@ -0,0 +1,102 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CHANNEL_MONITOR_H_
+#define CHANNEL_MONITOR_H_
+
+#include "channel_manager.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Setup the Channel Monitor resources required to initialize epoll.
+ * Must be called first before calling other functions.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int channel_monitor_init(void);
+
+/**
+ * Run the channel monitor, loops forever on on epoll_wait.
+ *
+ *
+ * @return
+ *  None
+ */
+void run_channel_monitor(void);
+
+/**
+ * Exit the Channel Monitor, exiting the epoll_wait loop and events processing.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+void channel_monitor_exit(void);
+
+/**
+ * Add an open channel to monitor via epoll. A pointer to struct channel_info
+ * will be registered with epoll for event processing.
+ * It is thread-safe.
+ *
+ * @param chan_info
+ *  Pointer to struct channel_info pointer.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int add_channel_to_monitor(struct channel_info **chan_info);
+
+/**
+ * Remove a previously added channel from epoll control.
+ *
+ * @param chan_info
+ *  Pointer to struct channel_info.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int remove_channel_from_monitor(struct channel_info *chan_info);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* CHANNEL_MONITOR_H_ */
diff --git a/src/seastar/dpdk/examples/vm_power_manager/guest_cli/Makefile b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/Makefile
new file mode 100644
index 00000000..55072708
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/Makefile
@@ -0,0 +1,56 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ifeq ($(RTE_SDK),)
+$(error "Please define RTE_SDK environment variable")
+endif
+
+# Default target, can be overridden by command line or environment
+RTE_TARGET ?= x86_64-native-linuxapp-gcc
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# binary name
+APP = guest_vm_power_mgr
+
+# all source are stored in SRCS-y
+SRCS-y := main.c vm_power_cli_guest.c
+
+CFLAGS += -O3 -I$(RTE_SDK)/lib/librte_power/
+CFLAGS += $(WERROR_FLAGS)
+
+# workaround for a gcc bug with noreturn attribute
+# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+CFLAGS_main.o += -Wno-return-type
+endif
+
+include $(RTE_SDK)/mk/rte.extapp.mk
diff --git a/src/seastar/dpdk/examples/vm_power_manager/guest_cli/main.c b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/main.c
new file mode 100644
index 00000000..5ac98ed3
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/main.c
@@ -0,0 +1,86 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/epoll.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+*/
+#include <signal.h>
+
+#include <rte_lcore.h>
+#include <rte_power.h>
+#include <rte_debug.h>
+
+#include "vm_power_cli_guest.h"
+
+static void
+sig_handler(int signo)
+{
+	printf("Received signal %d, exiting...\n", signo);
+	unsigned lcore_id;
+
+	RTE_LCORE_FOREACH(lcore_id) {
+		rte_power_exit(lcore_id);
+	}
+
+}
+
+int
+main(int argc, char **argv)
+{
+	int ret;
+	unsigned lcore_id;
+
+	ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_panic("Cannot init EAL\n");
+
+	signal(SIGINT, sig_handler);
+	signal(SIGTERM, sig_handler);
+
+	rte_power_set_env(PM_ENV_KVM_VM);
+	RTE_LCORE_FOREACH(lcore_id) {
+		rte_power_init(lcore_id);
+	}
+	run_cli(NULL);
+
+	return 0;
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/guest_cli/vm_power_cli_guest.c b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/vm_power_cli_guest.c
new file mode 100644
index 00000000..7931135e
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/vm_power_cli_guest.c
@@ -0,0 +1,155 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include <termios.h>
+
+#include <cmdline_rdline.h>
+#include <cmdline_parse.h>
+#include <cmdline_parse_string.h>
+#include <cmdline_parse_num.h>
+#include <cmdline_socket.h>
+#include <cmdline.h>
+#include <rte_log.h>
+#include <rte_lcore.h>
+
+#include <rte_power.h>
+
+#include "vm_power_cli_guest.h"
+
+
+#define CHANNEL_PATH "/dev/virtio-ports/virtio.serial.port.poweragent"
+
+
+#define RTE_LOGTYPE_GUEST_CHANNEL RTE_LOGTYPE_USER1
+
+struct cmd_quit_result {
+	cmdline_fixed_string_t quit;
+};
+
+static void cmd_quit_parsed(__attribute__((unused)) void *parsed_result,
+				__attribute__((unused)) struct cmdline *cl,
+			    __attribute__((unused)) void *data)
+{
+	unsigned lcore_id;
+
+	RTE_LCORE_FOREACH(lcore_id) {
+		rte_power_exit(lcore_id);
+	}
+	cmdline_quit(cl);
+}
+
+cmdline_parse_token_string_t cmd_quit_quit =
+	TOKEN_STRING_INITIALIZER(struct cmd_quit_result, quit, "quit");
+
+cmdline_parse_inst_t cmd_quit = {
+	.f = cmd_quit_parsed,  /* function to call */
+	.data = NULL,      /* 2nd arg of func */
+	.help_str = "close the application",
+	.tokens = {        /* token list, NULL terminated */
+		(void *)&cmd_quit_quit,
+		NULL,
+	},
+};
+
+/* *** VM operations *** */
+
+struct cmd_set_cpu_freq_result {
+	cmdline_fixed_string_t set_cpu_freq;
+	uint8_t lcore_id;
+	cmdline_fixed_string_t cmd;
+};
+
+static void
+cmd_set_cpu_freq_parsed(void *parsed_result, struct cmdline *cl,
+		       __attribute__((unused)) void *data)
+{
+	int ret = -1;
+	struct cmd_set_cpu_freq_result *res = parsed_result;
+
+	if (!strcmp(res->cmd , "up"))
+		ret = rte_power_freq_up(res->lcore_id);
+	else if (!strcmp(res->cmd , "down"))
+		ret = rte_power_freq_down(res->lcore_id);
+	else if (!strcmp(res->cmd , "min"))
+		ret = rte_power_freq_min(res->lcore_id);
+	else if (!strcmp(res->cmd , "max"))
+		ret = rte_power_freq_max(res->lcore_id);
+	if (ret != 1)
+		cmdline_printf(cl, "Error sending message: %s\n", strerror(ret));
+}
+
+cmdline_parse_token_string_t cmd_set_cpu_freq =
+	TOKEN_STRING_INITIALIZER(struct cmd_set_cpu_freq_result,
+			set_cpu_freq, "set_cpu_freq");
+cmdline_parse_token_string_t cmd_set_cpu_freq_core_num =
+	TOKEN_NUM_INITIALIZER(struct cmd_set_cpu_freq_result,
+			lcore_id, UINT8);
+cmdline_parse_token_string_t cmd_set_cpu_freq_cmd_cmd =
+	TOKEN_STRING_INITIALIZER(struct cmd_set_cpu_freq_result,
+			cmd, "up#down#min#max");
+
+cmdline_parse_inst_t cmd_set_cpu_freq_set = {
+	.f = cmd_set_cpu_freq_parsed,
+	.data = NULL,
+	.help_str = "set_cpu_freq <core_num> <up|down|min|max>, Set the current "
+			"frequency for the specified core by scaling up/down/min/max",
+	.tokens = {
+		(void *)&cmd_set_cpu_freq,
+		(void *)&cmd_set_cpu_freq_core_num,
+		(void *)&cmd_set_cpu_freq_cmd_cmd,
+		NULL,
+	},
+};
+
+cmdline_parse_ctx_t main_ctx[] = {
+		(cmdline_parse_inst_t *)&cmd_quit,
+		(cmdline_parse_inst_t *)&cmd_set_cpu_freq_set,
+		NULL,
+};
+
+void
+run_cli(__attribute__((unused)) void *arg)
+{
+	struct cmdline *cl;
+
+	cl = cmdline_stdin_new(main_ctx, "vmpower(guest)> ");
+	if (cl == NULL)
+		return;
+
+	cmdline_interact(cl);
+	cmdline_stdin_exit(cl);
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/guest_cli/vm_power_cli_guest.h b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/vm_power_cli_guest.h
new file mode 100644
index 00000000..0c4bdd5b
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/guest_cli/vm_power_cli_guest.h
@@ -0,0 +1,55 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VM_POWER_CLI_H_
+#define VM_POWER_CLI_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "channel_commands.h"
+
+int guest_channel_host_connect(unsigned lcore_id);
+
+int guest_channel_send_msg(struct channel_packet *pkt, unsigned lcore_id);
+
+void guest_channel_host_disconnect(unsigned lcore_id);
+
+void run_cli(__attribute__((unused)) void *arg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* VM_POWER_CLI_H_ */
diff --git a/src/seastar/dpdk/examples/vm_power_manager/main.c b/src/seastar/dpdk/examples/vm_power_manager/main.c
new file mode 100644
index 00000000..97178d14
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/main.c
@@ -0,0 +1,115 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/epoll.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_eal.h>
+#include <rte_launch.h>
+#include <rte_log.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_debug.h>
+
+#include "channel_manager.h"
+#include "channel_monitor.h"
+#include "power_manager.h"
+#include "vm_power_cli.h"
+
+static int
+run_monitor(__attribute__((unused)) void *arg)
+{
+	if (channel_monitor_init() < 0) {
+		printf("Unable to initialize channel monitor\n");
+		return -1;
+	}
+	run_channel_monitor();
+	return 0;
+}
+
+static void
+sig_handler(int signo)
+{
+	printf("Received signal %d, exiting...\n", signo);
+	channel_monitor_exit();
+	channel_manager_exit();
+	power_manager_exit();
+
+}
+
+int
+main(int argc, char **argv)
+{
+	int ret;
+	unsigned lcore_id;
+
+	ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_panic("Cannot init EAL\n");
+
+	signal(SIGINT, sig_handler);
+	signal(SIGTERM, sig_handler);
+
+	lcore_id = rte_get_next_lcore(-1, 1, 0);
+	if (lcore_id == RTE_MAX_LCORE) {
+		RTE_LOG(ERR, EAL, "A minimum of two cores are required to run "
+				"application\n");
+		return 0;
+	}
+	rte_eal_remote_launch(run_monitor, NULL, lcore_id);
+
+	if (power_manager_init() < 0) {
+		printf("Unable to initialize power manager\n");
+		return -1;
+	}
+	if (channel_manager_init(CHANNEL_MGR_DEFAULT_HV_PATH) < 0) {
+		printf("Unable to initialize channel manager\n");
+		return -1;
+	}
+	run_cli(NULL);
+
+	rte_eal_mp_wait_lcore();
+	return 0;
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/power_manager.c b/src/seastar/dpdk/examples/vm_power_manager/power_manager.c
new file mode 100644
index 00000000..2644fce6
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/power_manager.c
@@ -0,0 +1,252 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <sys/types.h>
+
+#include <rte_log.h>
+#include <rte_power.h>
+#include <rte_spinlock.h>
+
+#include "power_manager.h"
+
+#define RTE_LOGTYPE_POWER_MANAGER RTE_LOGTYPE_USER1
+
+#define POWER_SCALE_CORE(DIRECTION, core_num , ret) do { \
+	if (core_num >= POWER_MGR_MAX_CPUS) \
+		return -1; \
+	if (!(global_enabled_cpus & (1ULL << core_num))) \
+		return -1; \
+	rte_spinlock_lock(&global_core_freq_info[core_num].power_sl); \
+	ret = rte_power_freq_##DIRECTION(core_num); \
+	rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl); \
+} while (0)
+
+#define POWER_SCALE_MASK(DIRECTION, core_mask, ret) do { \
+	int i; \
+	for (i = 0; core_mask; core_mask &= ~(1 << i++)) { \
+		if ((core_mask >> i) & 1) { \
+			if (!(global_enabled_cpus & (1ULL << i))) \
+				continue; \
+			rte_spinlock_lock(&global_core_freq_info[i].power_sl); \
+			if (rte_power_freq_##DIRECTION(i) != 1) \
+				ret = -1; \
+			rte_spinlock_unlock(&global_core_freq_info[i].power_sl); \
+		} \
+	} \
+} while (0)
+
+struct freq_info {
+	rte_spinlock_t power_sl;
+	uint32_t freqs[RTE_MAX_LCORE_FREQS];
+	unsigned num_freqs;
+} __rte_cache_aligned;
+
+static struct freq_info global_core_freq_info[POWER_MGR_MAX_CPUS];
+
+static uint64_t global_enabled_cpus;
+
+#define SYSFS_CPU_PATH "/sys/devices/system/cpu/cpu%u/topology/core_id"
+
+static unsigned
+set_host_cpus_mask(void)
+{
+	char path[PATH_MAX];
+	unsigned i;
+	unsigned num_cpus = 0;
+
+	for (i = 0; i < POWER_MGR_MAX_CPUS; i++) {
+		snprintf(path, sizeof(path), SYSFS_CPU_PATH, i);
+		if (access(path, F_OK) == 0) {
+			global_enabled_cpus |= 1ULL << i;
+			num_cpus++;
+		} else
+			return num_cpus;
+	}
+	return num_cpus;
+}
+
+int
+power_manager_init(void)
+{
+	unsigned i, num_cpus;
+	uint64_t cpu_mask;
+	int ret = 0;
+
+	num_cpus = set_host_cpus_mask();
+	if (num_cpus == 0) {
+		RTE_LOG(ERR, POWER_MANAGER, "Unable to detected host CPUs, please "
+			"ensure that sufficient privileges exist to inspect sysfs\n");
+		return -1;
+	}
+	rte_power_set_env(PM_ENV_ACPI_CPUFREQ);
+	cpu_mask = global_enabled_cpus;
+	for (i = 0; cpu_mask; cpu_mask &= ~(1 << i++)) {
+		if (rte_power_init(i) < 0 || rte_power_freqs(i,
+				global_core_freq_info[i].freqs,
+				RTE_MAX_LCORE_FREQS) == 0) {
+			RTE_LOG(ERR, POWER_MANAGER, "Unable to initialize power manager "
+					"for core %u\n", i);
+			global_enabled_cpus &= ~(1 << i);
+			num_cpus--;
+			ret = -1;
+		}
+		rte_spinlock_init(&global_core_freq_info[i].power_sl);
+	}
+	RTE_LOG(INFO, POWER_MANAGER, "Detected %u host CPUs , enabled core mask:"
+					" 0x%"PRIx64"\n", num_cpus, global_enabled_cpus);
+	return ret;
+
+}
+
+uint32_t
+power_manager_get_current_frequency(unsigned core_num)
+{
+	uint32_t freq, index;
+
+	if (core_num >= POWER_MGR_MAX_CPUS) {
+		RTE_LOG(ERR, POWER_MANAGER, "Core(%u) is out of range 0...%d\n",
+				core_num, POWER_MGR_MAX_CPUS-1);
+		return -1;
+	}
+	if (!(global_enabled_cpus & (1ULL << core_num)))
+		return 0;
+
+	rte_spinlock_lock(&global_core_freq_info[core_num].power_sl);
+	index = rte_power_get_freq(core_num);
+	rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl);
+	if (index >= POWER_MGR_MAX_CPUS)
+		freq = 0;
+	else
+		freq = global_core_freq_info[core_num].freqs[index];
+
+	return freq;
+}
+
+int
+power_manager_exit(void)
+{
+	unsigned int i;
+	int ret = 0;
+
+	for (i = 0; global_enabled_cpus; global_enabled_cpus &= ~(1 << i++)) {
+		if (rte_power_exit(i) < 0) {
+			RTE_LOG(ERR, POWER_MANAGER, "Unable to shutdown power manager "
+					"for core %u\n", i);
+			ret = -1;
+		}
+	}
+	global_enabled_cpus = 0;
+	return ret;
+}
+
+int
+power_manager_scale_mask_up(uint64_t core_mask)
+{
+	int ret = 0;
+
+	POWER_SCALE_MASK(up, core_mask, ret);
+	return ret;
+}
+
+int
+power_manager_scale_mask_down(uint64_t core_mask)
+{
+	int ret = 0;
+
+	POWER_SCALE_MASK(down, core_mask, ret);
+	return ret;
+}
+
+int
+power_manager_scale_mask_min(uint64_t core_mask)
+{
+	int ret = 0;
+
+	POWER_SCALE_MASK(min, core_mask, ret);
+	return ret;
+}
+
+int
+power_manager_scale_mask_max(uint64_t core_mask)
+{
+	int ret = 0;
+
+	POWER_SCALE_MASK(max, core_mask, ret);
+	return ret;
+}
+
+int
+power_manager_scale_core_up(unsigned core_num)
+{
+	int ret = 0;
+
+	POWER_SCALE_CORE(up, core_num, ret);
+	return ret;
+}
+
+int
+power_manager_scale_core_down(unsigned core_num)
+{
+	int ret = 0;
+
+	POWER_SCALE_CORE(down, core_num, ret);
+	return ret;
+}
+
+int
+power_manager_scale_core_min(unsigned core_num)
+{
+	int ret = 0;
+
+	POWER_SCALE_CORE(min, core_num, ret);
+	return ret;
+}
+
+int
+power_manager_scale_core_max(unsigned core_num)
+{
+	int ret = 0;
+
+	POWER_SCALE_CORE(max, core_num, ret);
+	return ret;
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/power_manager.h b/src/seastar/dpdk/examples/vm_power_manager/power_manager.h
new file mode 100644
index 00000000..1b45babf
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/power_manager.h
@@ -0,0 +1,188 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef POWER_MANAGER_H_
+#define POWER_MANAGER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Maximum number of CPUS to manage */
+#define POWER_MGR_MAX_CPUS 64
+/**
+ * Initialize power management.
+ * Initializes resources and verifies the number of CPUs on the system.
+ * Wraps librte_power int rte_power_init(unsigned lcore_id);
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int power_manager_init(void);
+
+/**
+ * Exit power management. Must be called prior to exiting the application.
+ *
+ * @return
+ *  - 0 on success.
+ *  - Negative on error.
+ */
+int power_manager_exit(void);
+
+/**
+ * Scale up the frequency of the cores specified in core_mask.
+ * It is thread-safe.
+ *
+ * @param core_mask
+ *  The uint64_t bit-mask of cores to change frequency.
+ *
+ * @return
+ *  - 1 on success.
+ *  - Negative on error.
+ */
+int power_manager_scale_mask_up(uint64_t core_mask);
+
+/**
+ * Scale down the frequency of the cores specified in core_mask.
+ * It is thread-safe.
+ *
+ * @param core_mask
+ *  The uint64_t bit-mask of cores to change frequency.
+ *
+ * @return
+ *  - 1 on success.
+ *  - Negative on error.
+ */
+int power_manager_scale_mask_down(uint64_t core_mask);
+
+/**
+ * Scale to the minimum frequency of the cores specified in core_mask.
+ * It is thread-safe.
+ *
+ * @param core_mask
+ *  The uint64_t bit-mask of cores to change frequency.
+ *
+ * @return
+ *  - 1 on success.
+ *  - Negative on error.
+ */
+int power_manager_scale_mask_min(uint64_t core_mask);
+
+/**
+ * Scale to the maximum frequency of the cores specified in core_mask.
+ * It is thread-safe.
+ *
+ * @param core_mask
+ *  The uint64_t bit-mask of cores to change frequency.
+ *
+ * @return
+ *  - 1 on success.
+ *  - Negative on error.
+ */
+int power_manager_scale_mask_max(uint64_t core_mask);
+
+/**
+ * Scale up frequency for the core specified by core_num.
+ * It is thread-safe.
+ *
+ * @param core_num
+ *  The core number to change frequency
+ *
+ * @return
+ *  - 1 on success.
+ *  - Negative on error.
+ */
+int power_manager_scale_core_up(unsigned core_num);
+
+/**
+ * Scale down frequency for the core specified by core_num.
+ * It is thread-safe.
+ *
+ * @param core_num
+ *  The core number to change frequency
+ *
+ * @return
+ *  - 1 on success.
+ *  - 0 if frequency not changed.
+ *  - Negative on error.
+ */
+int power_manager_scale_core_down(unsigned core_num);
+
+/**
+ * Scale to minimum frequency for the core specified by core_num.
+ * It is thread-safe.
+ *
+ * @param core_num
+ *  The core number to change frequency
+ *
+ * @return
+ *  - 1 on success.
+ *  - 0 if frequency not changed.
+ *  - Negative on error.
+ */
+int power_manager_scale_core_min(unsigned core_num);
+
+/**
+ * Scale to maximum frequency for the core specified by core_num.
+ * It is thread-safe.
+ *
+ * @param core_num
+ *  The core number to change frequency
+ *
+ * @return
+ *  - 1 on success.
+ *  - 0 if frequency not changed.
+ *  - Negative on error.
+ */
+int power_manager_scale_core_max(unsigned core_num);
+
+/**
+ * Get the current freuency of the core specified by core_num
+ *
+ * @param core_num
+ *  The core number to get the current frequency
+ *
+ * @return
+ *  - 0  on error
+ *  - >0 for current frequency.
+ */
+uint32_t power_manager_get_current_frequency(unsigned core_num);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* POWER_MANAGER_H_ */
diff --git a/src/seastar/dpdk/examples/vm_power_manager/vm_power_cli.c b/src/seastar/dpdk/examples/vm_power_manager/vm_power_cli.c
new file mode 100644
index 00000000..c5e8d934
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/vm_power_cli.c
@@ -0,0 +1,672 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <string.h>
+#include <termios.h>
+#include <errno.h>
+
+#include <cmdline_rdline.h>
+#include <cmdline_parse.h>
+#include <cmdline_parse_string.h>
+#include <cmdline_parse_num.h>
+#include <cmdline_socket.h>
+#include <cmdline.h>
+
+#include "vm_power_cli.h"
+#include "channel_manager.h"
+#include "channel_monitor.h"
+#include "power_manager.h"
+#include "channel_commands.h"
+
+struct cmd_quit_result {
+	cmdline_fixed_string_t quit;
+};
+
+static void cmd_quit_parsed(__attribute__((unused)) void *parsed_result,
+		struct cmdline *cl,
+		__attribute__((unused)) void *data)
+{
+	channel_monitor_exit();
+	channel_manager_exit();
+	power_manager_exit();
+	cmdline_quit(cl);
+}
+
+cmdline_parse_token_string_t cmd_quit_quit =
+	TOKEN_STRING_INITIALIZER(struct cmd_quit_result, quit, "quit");
+
+cmdline_parse_inst_t cmd_quit = {
+	.f = cmd_quit_parsed,  /* function to call */
+	.data = NULL,      /* 2nd arg of func */
+	.help_str = "close the application",
+	.tokens = {        /* token list, NULL terminated */
+		(void *)&cmd_quit_quit,
+		NULL,
+	},
+};
+
+/* *** VM operations *** */
+struct cmd_show_vm_result {
+	cmdline_fixed_string_t show_vm;
+	cmdline_fixed_string_t vm_name;
+};
+
+static void
+cmd_show_vm_parsed(void *parsed_result, struct cmdline *cl,
+		__attribute__((unused)) void *data)
+{
+	struct cmd_show_vm_result *res = parsed_result;
+	struct vm_info info;
+	unsigned i;
+
+	if (get_info_vm(res->vm_name, &info) != 0)
+		return;
+	cmdline_printf(cl, "VM: '%s', status = ", info.name);
+	if (info.status == CHANNEL_MGR_VM_ACTIVE)
+		cmdline_printf(cl, "ACTIVE\n");
+	else
+		cmdline_printf(cl, "INACTIVE\n");
+	cmdline_printf(cl, "Channels %u\n", info.num_channels);
+	for (i = 0; i < info.num_channels; i++) {
+		cmdline_printf(cl, "  [%u]: %s, status = ", i,
+				info.channels[i].channel_path);
+		switch (info.channels[i].status) {
+		case CHANNEL_MGR_CHANNEL_CONNECTED:
+			cmdline_printf(cl, "CONNECTED\n");
+			break;
+		case CHANNEL_MGR_CHANNEL_DISCONNECTED:
+			cmdline_printf(cl, "DISCONNECTED\n");
+			break;
+		case CHANNEL_MGR_CHANNEL_DISABLED:
+			cmdline_printf(cl, "DISABLED\n");
+			break;
+		case CHANNEL_MGR_CHANNEL_PROCESSING:
+			cmdline_printf(cl, "PROCESSING\n");
+			break;
+		default:
+			cmdline_printf(cl, "UNKNOWN\n");
+			break;
+		}
+	}
+	cmdline_printf(cl, "Virtual CPU(s): %u\n", info.num_vcpus);
+	for (i = 0; i < info.num_vcpus; i++) {
+		cmdline_printf(cl, "  [%u]: Physical CPU Mask 0x%"PRIx64"\n", i,
+				info.pcpu_mask[i]);
+	}
+}
+
+
+
+cmdline_parse_token_string_t cmd_vm_show =
+	TOKEN_STRING_INITIALIZER(struct cmd_show_vm_result,
+				show_vm, "show_vm");
+cmdline_parse_token_string_t cmd_show_vm_name =
+	TOKEN_STRING_INITIALIZER(struct cmd_show_vm_result,
+			vm_name, NULL);
+
+cmdline_parse_inst_t cmd_show_vm_set = {
+	.f = cmd_show_vm_parsed,
+	.data = NULL,
+	.help_str = "show_vm <vm_name>, prints the information on the "
+			"specified VM(s), the information lists the number of vCPUS, the "
+			"pinning to pCPU(s) as a bit mask, along with any communication "
+			"channels associated with each VM",
+	.tokens = {
+		(void *)&cmd_vm_show,
+		(void *)&cmd_show_vm_name,
+		NULL,
+	},
+};
+
+/* *** vCPU to pCPU mapping operations *** */
+struct cmd_set_pcpu_mask_result {
+	cmdline_fixed_string_t set_pcpu_mask;
+	cmdline_fixed_string_t vm_name;
+	uint8_t vcpu;
+	uint64_t core_mask;
+};
+
+static void
+cmd_set_pcpu_mask_parsed(void *parsed_result, struct cmdline *cl,
+		__attribute__((unused)) void *data)
+{
+	struct cmd_set_pcpu_mask_result *res = parsed_result;
+
+	if (set_pcpus_mask(res->vm_name, res->vcpu, res->core_mask) == 0)
+		cmdline_printf(cl, "Pinned vCPU(%"PRId8") to pCPU core "
+				"mask(0x%"PRIx64")\n", res->vcpu, res->core_mask);
+	else
+		cmdline_printf(cl, "Unable to pin vCPU(%"PRId8") to pCPU core "
+				"mask(0x%"PRIx64")\n", res->vcpu, res->core_mask);
+}
+
+cmdline_parse_token_string_t cmd_set_pcpu_mask =
+		TOKEN_STRING_INITIALIZER(struct cmd_set_pcpu_mask_result,
+				set_pcpu_mask, "set_pcpu_mask");
+cmdline_parse_token_string_t cmd_set_pcpu_mask_vm_name =
+		TOKEN_STRING_INITIALIZER(struct cmd_set_pcpu_mask_result,
+				vm_name, NULL);
+cmdline_parse_token_num_t set_pcpu_mask_vcpu =
+		TOKEN_NUM_INITIALIZER(struct cmd_set_pcpu_mask_result,
+				vcpu, UINT8);
+cmdline_parse_token_num_t set_pcpu_mask_core_mask =
+		TOKEN_NUM_INITIALIZER(struct cmd_set_pcpu_mask_result,
+				core_mask, UINT64);
+
+
+cmdline_parse_inst_t cmd_set_pcpu_mask_set = {
+		.f = cmd_set_pcpu_mask_parsed,
+		.data = NULL,
+		.help_str = "set_pcpu_mask <vm_name> <vcpu> <pcpu>, Set the binding "
+				"of Virtual CPU on VM to the Physical CPU mask.",
+				.tokens = {
+						(void *)&cmd_set_pcpu_mask,
+						(void *)&cmd_set_pcpu_mask_vm_name,
+						(void *)&set_pcpu_mask_vcpu,
+						(void *)&set_pcpu_mask_core_mask,
+						NULL,
+		},
+};
+
+struct cmd_set_pcpu_result {
+	cmdline_fixed_string_t set_pcpu;
+	cmdline_fixed_string_t vm_name;
+	uint8_t vcpu;
+	uint8_t core;
+};
+
+static void
+cmd_set_pcpu_parsed(void *parsed_result, struct cmdline *cl,
+		__attribute__((unused)) void *data)
+{
+	struct cmd_set_pcpu_result *res = parsed_result;
+
+	if (set_pcpu(res->vm_name, res->vcpu, res->core) == 0)
+		cmdline_printf(cl, "Pinned vCPU(%"PRId8") to pCPU core "
+				"%"PRId8")\n", res->vcpu, res->core);
+	else
+		cmdline_printf(cl, "Unable to pin vCPU(%"PRId8") to pCPU core "
+				"%"PRId8")\n", res->vcpu, res->core);
+}
+
+cmdline_parse_token_string_t cmd_set_pcpu =
+		TOKEN_STRING_INITIALIZER(struct cmd_set_pcpu_result,
+				set_pcpu, "set_pcpu");
+cmdline_parse_token_string_t cmd_set_pcpu_vm_name =
+		TOKEN_STRING_INITIALIZER(struct cmd_set_pcpu_result,
+				vm_name, NULL);
+cmdline_parse_token_num_t set_pcpu_vcpu =
+		TOKEN_NUM_INITIALIZER(struct cmd_set_pcpu_result,
+				vcpu, UINT8);
+cmdline_parse_token_num_t set_pcpu_core =
+		TOKEN_NUM_INITIALIZER(struct cmd_set_pcpu_result,
+				core, UINT64);
+
+
+cmdline_parse_inst_t cmd_set_pcpu_set = {
+		.f = cmd_set_pcpu_parsed,
+		.data = NULL,
+		.help_str = "set_pcpu <vm_name> <vcpu> <pcpu>, Set the binding "
+				"of Virtual CPU on VM to the Physical CPU.",
+				.tokens = {
+						(void *)&cmd_set_pcpu,
+						(void *)&cmd_set_pcpu_vm_name,
+						(void *)&set_pcpu_vcpu,
+						(void *)&set_pcpu_core,
+						NULL,
+		},
+};
+
+struct cmd_vm_op_result {
+	cmdline_fixed_string_t op_vm;
+	cmdline_fixed_string_t vm_name;
+};
+
+static void
+cmd_vm_op_parsed(void *parsed_result, struct cmdline *cl,
+		__attribute__((unused)) void *data)
+{
+	struct cmd_vm_op_result *res = parsed_result;
+
+	if (!strcmp(res->op_vm, "add_vm")) {
+		if (add_vm(res->vm_name) < 0)
+			cmdline_printf(cl, "Unable to add VM '%s'\n", res->vm_name);
+	} else if (remove_vm(res->vm_name) < 0)
+		cmdline_printf(cl, "Unable to remove VM '%s'\n", res->vm_name);
+}
+
+cmdline_parse_token_string_t cmd_vm_op =
+	TOKEN_STRING_INITIALIZER(struct cmd_vm_op_result,
+			op_vm, "add_vm#rm_vm");
+cmdline_parse_token_string_t cmd_vm_name =
+	TOKEN_STRING_INITIALIZER(struct cmd_vm_op_result,
+			vm_name, NULL);
+
+cmdline_parse_inst_t cmd_vm_op_set = {
+	.f = cmd_vm_op_parsed,
+	.data = NULL,
+	.help_str = "add_vm|rm_vm <name>, add a VM for "
+			"subsequent operations with the CLI or remove a previously added "
+			"VM from the VM Power Manager",
+	.tokens = {
+		(void *)&cmd_vm_op,
+		(void *)&cmd_vm_name,
+	NULL,
+	},
+};
+
+/* *** VM channel operations *** */
+struct cmd_channels_op_result {
+	cmdline_fixed_string_t op;
+	cmdline_fixed_string_t vm_name;
+	cmdline_fixed_string_t channel_list;
+};
+static void
+cmd_channels_op_parsed(void *parsed_result, struct cmdline *cl,
+			__attribute__((unused)) void *data)
+{
+	unsigned num_channels = 0, channel_num, i;
+	int channels_added;
+	unsigned channel_list[CHANNEL_CMDS_MAX_VM_CHANNELS];
+	char *token, *remaining, *tail_ptr;
+	struct cmd_channels_op_result *res = parsed_result;
+
+	if (!strcmp(res->channel_list, "all")) {
+		channels_added = add_all_channels(res->vm_name);
+		cmdline_printf(cl, "Added %d channels for VM '%s'\n",
+				channels_added, res->vm_name);
+		return;
+	}
+
+	remaining = res->channel_list;
+	while (1) {
+		if (remaining == NULL || remaining[0] == '\0')
+			break;
+
+		token = strsep(&remaining, ",");
+		if (token == NULL)
+			break;
+		errno = 0;
+		channel_num = (unsigned)strtol(token, &tail_ptr, 10);
+		if ((errno != 0) || tail_ptr == NULL || (*tail_ptr != '\0'))
+			break;
+
+		if (channel_num == CHANNEL_CMDS_MAX_VM_CHANNELS) {
+			cmdline_printf(cl, "Channel number '%u' exceeds the maximum number "
+					"of allowable channels(%u) for VM '%s'\n", channel_num,
+					CHANNEL_CMDS_MAX_VM_CHANNELS, res->vm_name);
+			return;
+		}
+		channel_list[num_channels++] = channel_num;
+	}
+	for (i = 0; i < num_channels; i++)
+		cmdline_printf(cl, "[%u]: Adding channel %u\n", i, channel_list[i]);
+
+	channels_added = add_channels(res->vm_name, channel_list,
+			num_channels);
+	cmdline_printf(cl, "Enabled %d channels for '%s'\n", channels_added,
+			res->vm_name);
+}
+
+cmdline_parse_token_string_t cmd_channels_op =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_op_result,
+				op, "add_channels");
+cmdline_parse_token_string_t cmd_channels_vm_name =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_op_result,
+			vm_name, NULL);
+cmdline_parse_token_string_t cmd_channels_list =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_op_result,
+			channel_list, NULL);
+
+cmdline_parse_inst_t cmd_channels_op_set = {
+	.f = cmd_channels_op_parsed,
+	.data = NULL,
+	.help_str = "add_channels <vm_name> <list>|all, add "
+			"communication channels for the specified VM, the "
+			"virtio channels must be enabled in the VM "
+			"configuration(qemu/libvirt) and the associated VM must be active. "
+			"<list> is a comma-separated list of channel numbers to add, using "
+			"the keyword 'all' will attempt to add all channels for the VM",
+	.tokens = {
+		(void *)&cmd_channels_op,
+		(void *)&cmd_channels_vm_name,
+		(void *)&cmd_channels_list,
+		NULL,
+	},
+};
+
+struct cmd_channels_status_op_result {
+	cmdline_fixed_string_t op;
+	cmdline_fixed_string_t vm_name;
+	cmdline_fixed_string_t channel_list;
+	cmdline_fixed_string_t status;
+};
+
+static void
+cmd_channels_status_op_parsed(void *parsed_result, struct cmdline *cl,
+		       __attribute__((unused)) void *data)
+{
+	unsigned num_channels = 0, channel_num;
+	int changed;
+	unsigned channel_list[CHANNEL_CMDS_MAX_VM_CHANNELS];
+	char *token, *remaining, *tail_ptr;
+	struct cmd_channels_status_op_result *res = parsed_result;
+	enum channel_status status;
+
+	if (!strcmp(res->status, "enabled"))
+		status = CHANNEL_MGR_CHANNEL_CONNECTED;
+	else
+		status = CHANNEL_MGR_CHANNEL_DISABLED;
+
+	if (!strcmp(res->channel_list, "all")) {
+		changed = set_channel_status_all(res->vm_name, status);
+		cmdline_printf(cl, "Updated status of %d channels "
+				"for VM '%s'\n", changed, res->vm_name);
+		return;
+	}
+	remaining = res->channel_list;
+	while (1) {
+		if (remaining == NULL || remaining[0] == '\0')
+			break;
+		token = strsep(&remaining, ",");
+		if (token == NULL)
+			break;
+		errno = 0;
+		channel_num = (unsigned)strtol(token, &tail_ptr, 10);
+		if ((errno != 0) || tail_ptr == NULL || (*tail_ptr != '\0'))
+			break;
+
+		if (channel_num == CHANNEL_CMDS_MAX_VM_CHANNELS) {
+			cmdline_printf(cl, "%u exceeds the maximum number of allowable "
+					"channels(%u) for VM '%s'\n", channel_num,
+					CHANNEL_CMDS_MAX_VM_CHANNELS, res->vm_name);
+			return;
+		}
+		channel_list[num_channels++] = channel_num;
+	}
+	changed = set_channel_status(res->vm_name, channel_list, num_channels,
+			status);
+	cmdline_printf(cl, "Updated status of %d channels "
+					"for VM '%s'\n", changed, res->vm_name);
+}
+
+cmdline_parse_token_string_t cmd_channels_status_op =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_status_op_result,
+				op, "set_channel_status");
+cmdline_parse_token_string_t cmd_channels_status_vm_name =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_status_op_result,
+			vm_name, NULL);
+cmdline_parse_token_string_t cmd_channels_status_list =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_status_op_result,
+			channel_list, NULL);
+cmdline_parse_token_string_t cmd_channels_status =
+	TOKEN_STRING_INITIALIZER(struct cmd_channels_status_op_result,
+			status, "enabled#disabled");
+
+cmdline_parse_inst_t cmd_channels_status_op_set = {
+	.f = cmd_channels_status_op_parsed,
+	.data = NULL,
+	.help_str = "set_channel_status <vm_name> <list>|all enabled|disabled, "
+			" enable or disable the communication channels in "
+			"list(comma-separated) for the specified VM, alternatively "
+			"list can be replaced with keyword 'all'. "
+			"Disabled channels will still receive packets on the host, "
+			"however the commands they specify will be ignored. "
+			"Set status to 'enabled' to begin processing requests again.",
+	.tokens = {
+		(void *)&cmd_channels_status_op,
+		(void *)&cmd_channels_status_vm_name,
+		(void *)&cmd_channels_status_list,
+		(void *)&cmd_channels_status,
+		NULL,
+	},
+};
+
+/* *** CPU Frequency operations *** */
+struct cmd_show_cpu_freq_mask_result {
+	cmdline_fixed_string_t show_cpu_freq_mask;
+	uint64_t core_mask;
+};
+
+static void
+cmd_show_cpu_freq_mask_parsed(void *parsed_result, struct cmdline *cl,
+		       __attribute__((unused)) void *data)
+{
+	struct cmd_show_cpu_freq_mask_result *res = parsed_result;
+	unsigned i;
+	uint64_t mask = res->core_mask;
+	uint32_t freq;
+
+	for (i = 0; mask; mask &= ~(1ULL << i++)) {
+		if ((mask >> i) & 1) {
+			freq = power_manager_get_current_frequency(i);
+			if (freq > 0)
+				cmdline_printf(cl, "Core %u: %"PRId32"\n", i, freq);
+		}
+	}
+}
+
+cmdline_parse_token_string_t cmd_show_cpu_freq_mask =
+	TOKEN_STRING_INITIALIZER(struct cmd_show_cpu_freq_mask_result,
+			show_cpu_freq_mask, "show_cpu_freq_mask");
+cmdline_parse_token_num_t cmd_show_cpu_freq_mask_core_mask =
+	TOKEN_NUM_INITIALIZER(struct cmd_show_cpu_freq_mask_result,
+			core_mask, UINT64);
+
+cmdline_parse_inst_t cmd_show_cpu_freq_mask_set = {
+	.f = cmd_show_cpu_freq_mask_parsed,
+	.data = NULL,
+	.help_str = "show_cpu_freq_mask <mask>, Get the current frequency for each "
+			"core specified in the mask",
+	.tokens = {
+		(void *)&cmd_show_cpu_freq_mask,
+		(void *)&cmd_show_cpu_freq_mask_core_mask,
+		NULL,
+	},
+};
+
+struct cmd_set_cpu_freq_mask_result {
+	cmdline_fixed_string_t set_cpu_freq_mask;
+	uint64_t core_mask;
+	cmdline_fixed_string_t cmd;
+};
+
+static void
+cmd_set_cpu_freq_mask_parsed(void *parsed_result, struct cmdline *cl,
+			__attribute__((unused)) void *data)
+{
+	struct cmd_set_cpu_freq_mask_result *res = parsed_result;
+	int ret = -1;
+
+	if (!strcmp(res->cmd , "up"))
+		ret = power_manager_scale_mask_up(res->core_mask);
+	else if (!strcmp(res->cmd , "down"))
+		ret = power_manager_scale_mask_down(res->core_mask);
+	else if (!strcmp(res->cmd , "min"))
+		ret = power_manager_scale_mask_min(res->core_mask);
+	else if (!strcmp(res->cmd , "max"))
+		ret = power_manager_scale_mask_max(res->core_mask);
+	if (ret < 0) {
+		cmdline_printf(cl, "Error scaling core_mask(0x%"PRIx64") '%s' , not "
+				"all cores specified have been scaled\n",
+				res->core_mask, res->cmd);
+	};
+}
+
+cmdline_parse_token_string_t cmd_set_cpu_freq_mask =
+	TOKEN_STRING_INITIALIZER(struct cmd_set_cpu_freq_mask_result,
+			set_cpu_freq_mask, "set_cpu_freq_mask");
+cmdline_parse_token_num_t cmd_set_cpu_freq_mask_core_mask =
+	TOKEN_NUM_INITIALIZER(struct cmd_set_cpu_freq_mask_result,
+			core_mask, UINT64);
+cmdline_parse_token_string_t cmd_set_cpu_freq_mask_result =
+	TOKEN_STRING_INITIALIZER(struct cmd_set_cpu_freq_mask_result,
+			cmd, "up#down#min#max");
+
+cmdline_parse_inst_t cmd_set_cpu_freq_mask_set = {
+	.f = cmd_set_cpu_freq_mask_parsed,
+	.data = NULL,
+	.help_str = "set_cpu_freq <core_mask> <up|down|min|max>, Set the current "
+			"frequency for the cores specified in <core_mask> by scaling "
+			"each up/down/min/max.",
+	.tokens = {
+		(void *)&cmd_set_cpu_freq_mask,
+		(void *)&cmd_set_cpu_freq_mask_core_mask,
+		(void *)&cmd_set_cpu_freq_mask_result,
+		NULL,
+	},
+};
+
+
+
+struct cmd_show_cpu_freq_result {
+	cmdline_fixed_string_t show_cpu_freq;
+	uint8_t core_num;
+};
+
+static void
+cmd_show_cpu_freq_parsed(void *parsed_result, struct cmdline *cl,
+		       __attribute__((unused)) void *data)
+{
+	struct cmd_show_cpu_freq_result *res = parsed_result;
+	uint32_t curr_freq = power_manager_get_current_frequency(res->core_num);
+
+	if (curr_freq == 0) {
+		cmdline_printf(cl, "Unable to get frequency for core %u\n",
+				res->core_num);
+		return;
+	}
+	cmdline_printf(cl, "Core %u frequency: %"PRId32"\n", res->core_num,
+			curr_freq);
+}
+
+cmdline_parse_token_string_t cmd_show_cpu_freq =
+	TOKEN_STRING_INITIALIZER(struct cmd_show_cpu_freq_result,
+			show_cpu_freq, "show_cpu_freq");
+
+cmdline_parse_token_num_t cmd_show_cpu_freq_core_num =
+	TOKEN_NUM_INITIALIZER(struct cmd_show_cpu_freq_result,
+			core_num, UINT8);
+
+cmdline_parse_inst_t cmd_show_cpu_freq_set = {
+	.f = cmd_show_cpu_freq_parsed,
+	.data = NULL,
+	.help_str = "Get the current frequency for the specified core",
+	.tokens = {
+		(void *)&cmd_show_cpu_freq,
+		(void *)&cmd_show_cpu_freq_core_num,
+		NULL,
+	},
+};
+
+struct cmd_set_cpu_freq_result {
+	cmdline_fixed_string_t set_cpu_freq;
+	uint8_t core_num;
+	cmdline_fixed_string_t cmd;
+};
+
+static void
+cmd_set_cpu_freq_parsed(void *parsed_result, struct cmdline *cl,
+		       __attribute__((unused)) void *data)
+{
+	int ret = -1;
+	struct cmd_set_cpu_freq_result *res = parsed_result;
+
+	if (!strcmp(res->cmd , "up"))
+		ret = power_manager_scale_core_up(res->core_num);
+	else if (!strcmp(res->cmd , "down"))
+		ret = power_manager_scale_core_down(res->core_num);
+	else if (!strcmp(res->cmd , "min"))
+		ret = power_manager_scale_core_min(res->core_num);
+	else if (!strcmp(res->cmd , "max"))
+		ret = power_manager_scale_core_max(res->core_num);
+	if (ret < 0) {
+		cmdline_printf(cl, "Error scaling core(%u) '%s'\n", res->core_num,
+				res->cmd);
+	}
+}
+
+cmdline_parse_token_string_t cmd_set_cpu_freq =
+	TOKEN_STRING_INITIALIZER(struct cmd_set_cpu_freq_result,
+			set_cpu_freq, "set_cpu_freq");
+cmdline_parse_token_num_t cmd_set_cpu_freq_core_num =
+	TOKEN_NUM_INITIALIZER(struct cmd_set_cpu_freq_result,
+			core_num, UINT8);
+cmdline_parse_token_string_t cmd_set_cpu_freq_cmd_cmd =
+	TOKEN_STRING_INITIALIZER(struct cmd_set_cpu_freq_result,
+			cmd, "up#down#min#max");
+
+cmdline_parse_inst_t cmd_set_cpu_freq_set = {
+	.f = cmd_set_cpu_freq_parsed,
+	.data = NULL,
+	.help_str = "set_cpu_freq <core_num> <up|down|min|max>, Set the current "
+			"frequency for the specified core by scaling up/down/min/max",
+	.tokens = {
+		(void *)&cmd_set_cpu_freq,
+		(void *)&cmd_set_cpu_freq_core_num,
+		(void *)&cmd_set_cpu_freq_cmd_cmd,
+		NULL,
+	},
+};
+
+cmdline_parse_ctx_t main_ctx[] = {
+		(cmdline_parse_inst_t *)&cmd_quit,
+		(cmdline_parse_inst_t *)&cmd_vm_op_set,
+		(cmdline_parse_inst_t *)&cmd_channels_op_set,
+		(cmdline_parse_inst_t *)&cmd_channels_status_op_set,
+		(cmdline_parse_inst_t *)&cmd_show_vm_set,
+		(cmdline_parse_inst_t *)&cmd_show_cpu_freq_mask_set,
+		(cmdline_parse_inst_t *)&cmd_set_cpu_freq_mask_set,
+		(cmdline_parse_inst_t *)&cmd_show_cpu_freq_set,
+		(cmdline_parse_inst_t *)&cmd_set_cpu_freq_set,
+		(cmdline_parse_inst_t *)&cmd_set_pcpu_mask_set,
+		(cmdline_parse_inst_t *)&cmd_set_pcpu_set,
+		NULL,
+};
+
+void
+run_cli(__attribute__((unused)) void *arg)
+{
+	struct cmdline *cl;
+
+	cl = cmdline_stdin_new(main_ctx, "vmpower> ");
+	if (cl == NULL)
+		return;
+
+	cmdline_interact(cl);
+	cmdline_stdin_exit(cl);
+}
diff --git a/src/seastar/dpdk/examples/vm_power_manager/vm_power_cli.h b/src/seastar/dpdk/examples/vm_power_manager/vm_power_cli.h
new file mode 100644
index 00000000..deccd513
--- /dev/null
+++ b/src/seastar/dpdk/examples/vm_power_manager/vm_power_cli.h
@@ -0,0 +1,47 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VM_POWER_CLI_H_
+#define VM_POWER_CLI_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void run_cli(__attribute__((unused)) void *arg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* VM_POWER_CLI_H_ */