Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 805 insertions, 0 deletions

diff --git a/examples/vm_power_manager/channel_manager.c b/examples/vm_power_manager/channel_manager.c
new file mode 100644
index 00000000..22c2ddd5
--- /dev/null
+++ b/examples/vm_power_manager/channel_manager.c
@@ -0,0 +1,805 @@
+/*-
+ *   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->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();
+}