Index: usr.sbin/bhyvectl/bhyvectl.c
===================================================================
--- usr.sbin/bhyvectl/bhyvectl.c
+++ usr.sbin/bhyvectl/bhyvectl.c
@@ -36,10 +36,10 @@
 #include <sys/mman.h>
 #include <sys/cpuset.h>
 
+#include <dirent.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
-#include <string.h>
 #include <unistd.h>
 #include <libgen.h>
 #include <libutil.h>
@@ -77,6 +77,7 @@
 	"       [--cpu=<vcpu_number>]\n"
 	"       [--create]\n"
 	"       [--destroy]\n"
+	"	[--list]\n"
 	"       [--get-all]\n"
 	"       [--get-stats]\n"
 	"       [--set-desc-ds]\n"
@@ -239,7 +240,7 @@
 static int inject_nmi, assert_lapic_lvt;
 static int force_reset, force_poweroff;
 static const char *capname;
-static int create, destroy, get_memmap, get_memseg;
+static int create, destroy, list, get_memmap, get_memseg;
 static int get_intinfo;
 static int get_active_cpus, get_suspended_cpus;
 static uint64_t memsize;
@@ -585,6 +586,25 @@
 	printf("\n");
 }
 
+/*
+ * Parse the number of CPU specified to a VM and
+ * return the total number of it.
+ */
+static int
+count_vcpus(const cpuset_t *cpus)
+{
+	int i, count = 0;
+
+	if (!CPU_EMPTY(cpus)) {
+		for (i = 0; i < CPU_SETSIZE; i++) { 
+			if (CPU_ISSET(count, cpus))
+				count++;
+		}
+	}
+
+	return count;
+}
+
 static void
 print_intinfo(const char *banner, uint64_t info)
 {
@@ -1376,6 +1396,7 @@
 		{ "run",		NO_ARG,	&run,			1 },
 		{ "create",		NO_ARG,	&create,		1 },
 		{ "destroy",		NO_ARG,	&destroy,		1 },
+		{ "list",		NO_ARG, &list,			1},
 		{ "inject-nmi",		NO_ARG,	&inject_nmi,		1 },
 		{ "force-reset",	NO_ARG,	&force_reset,		1 },
 		{ "force-poweroff", 	NO_ARG,	&force_poweroff, 	1 },
@@ -1523,6 +1544,67 @@
 		return ("UNK");
 }
 
+static void
+list_vm(char *vmname)
+{
+	DIR *path_vmm;
+	struct dirent *dir;
+	struct vmctx *ctx;
+	int error, vcpus = 0;
+	cpuset_t cpus;
+	char numbuf[8];
+	vm_paddr_t gpa;
+	vm_ooffset_t segoff;
+	int segid, flags, prot;
+	size_t maplen;
+
+	printf("NAME\t\t MEM\t\t\t VCPU\n");
+
+	path_vmm = opendir("/dev/vmm");
+	if (path_vmm) {
+		while ((dir = readdir(path_vmm)) != NULL) {
+			gpa = 0;
+			if (strcmp(".", dir->d_name) != 0 &&
+				strcmp("..", dir->d_name) !=0 &&
+				strstr(dir->d_name, "bootrom") == NULL) {
+				
+				ctx = vm_open(dir->d_name);
+				if (ctx == NULL) {
+					printf("You have no permission to open: %s\n", vmname);
+					exit (1);
+				}
+
+				error = vm_mmap_getnext(ctx, &gpa, &segid, &segoff, &maplen,
+					&prot, &flags);
+				if (error) {
+					printf("Error to get memory segment information.\n");
+					exit (1);
+				}
+
+				humanize_number(numbuf, sizeof(numbuf), maplen, "B",
+					HN_AUTOSCALE, HN_NOSPACE);
+
+				error = vm_active_cpus(ctx, &cpus);
+				if (!error)
+					vcpus = count_vcpus(&cpus);
+				else {
+					printf("Error to get the number of vcpus.\n");
+					exit (1);
+				}
+
+				if (vmname && strcmp(vmname, dir->d_name) == 0) {
+					printf("%s\t\t %s\t\t\t %d\n", dir->d_name,
+						numbuf, vcpus);
+					break;
+				} else if (!vmname)
+					printf("%s\t\t %s\t\t\t %d\n", dir->d_name,
+						numbuf, vcpus);
+			}
+		}
+	}
+}
+
+
 static int
 show_memmap(struct vmctx *ctx)
 {
@@ -1763,7 +1845,16 @@
 	argc -= optind;
 	argv += optind;
 
-	if (vmname == NULL)
+	if (list) {
+		if (vmname)
+			list_vm(vmname);
+		else
+			list_vm(NULL);
+
+		exit (0);
+	}
+
+	if (vmname == NULL && !list)
 		usage(cpu_intel);
 
 	error = 0;