diff --git a/bin/cros_run_vm_test b/bin/cros_run_vm_test
index 6981745ac4..8036b230b1 100755
--- a/bin/cros_run_vm_test
+++ b/bin/cros_run_vm_test
@@ -8,6 +8,7 @@
 
 . "$(dirname $0)/../common.sh"
 . "$(dirname $0)/../lib/cros_vm_lib.sh"
+. "$(dirname "$0")/../lib/cros_vm_constants.sh"
 
 DEFINE_string image_path "" "Full path of the VM image"
 DEFINE_string test_case "" "Name of the test case to run"
@@ -18,8 +19,16 @@ set -e
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
-[ -n "${FLAGS_image_path}" ] || die "You must specify a path to an image"
-[ -n "${FLAGS_test_case}" ] || die "You must specify a test case"
+# Use latest if not specified.
+if [ -z "${FLAGS_image_path}" ]; then
+  LATEST_IMAGE="$(${SCRIPTS_DIR}/get_latest_image.sh)/${DEFAULT_QEMU_IMAGE}"
+  info "Using latest vm image ${LATEST_IMAGE}"
+  FLAGS_image_path=${LATEST_IMAGE}
+fi
+
+[ -e "${FLAGS_image_path}" ] || die "Image ${FLAGS_image_path} does not exist."
+
+[ -n "${FLAGS_test_case}" ] || die "You must specify a test case."
 
 trap stop_kvm EXIT
 start_kvm "${FLAGS_image_path}"
diff --git a/image_to_vm.sh b/image_to_vm.sh
index 3807269856..c2fb82b748 100755
--- a/image_to_vm.sh
+++ b/image_to_vm.sh
@@ -11,22 +11,11 @@
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 . "$(dirname "$0")/chromeos-common.sh"
+. "$(dirname "$0")/lib/cros_vm_constants.sh"
 
 get_default_board
 assert_inside_chroot
 
-DEFAULT_MEM="1024"
-DEFAULT_VMDK="ide.vmdk"
-DEFAULT_VMX="chromiumos.vmx"
-DEFAULT_VBOX_DISK="os.vdi"
-DEFAULT_QEMU_IMAGE="chromiumos_qemu_image.bin"
-
-# Minimum sizes for full size vm images -- needed for update.
-MIN_VDISK_SIZE_FULL=6072
-MIN_STATEFUL_FS_SIZE_FULL=2048
-
-MOD_SCRIPTS_ROOT="${GCLIENT_ROOT}/src/scripts/mod_for_test_scripts"
-
 # Flags
 DEFINE_string board "${DEFAULT_BOARD}" \
   "Board for which the image was built"
@@ -85,7 +74,7 @@ fi
 IMAGES_DIR="${DEFAULT_BUILD_ROOT}/images/${FLAGS_board}"
 # Default to the most recent image
 if [ -z "${FLAGS_from}" ] ; then
-  FLAGS_from="${IMAGES_DIR}/$(ls -t $IMAGES_DIR | head -1)"
+  FLAGS_from="$(./get_latest_image.sh)"
 else
   pushd "${FLAGS_from}" && FLAGS_from=`pwd` && popd
 fi
diff --git a/lib/cros_vm_constants.sh b/lib/cros_vm_constants.sh
new file mode 100644
index 0000000000..124d158eb5
--- /dev/null
+++ b/lib/cros_vm_constants.sh
@@ -0,0 +1,16 @@
+# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Common constants for vm scripts.
+
+# Default values for creating VM's.
+DEFAULT_MEM="1024"
+DEFAULT_VMDK="ide.vmdk"
+DEFAULT_VMX="chromiumos.vmx"
+DEFAULT_VBOX_DISK="os.vdi"
+DEFAULT_QEMU_IMAGE="chromiumos_qemu_image.bin"
+
+# Minimum sizes for full size vm images -- needed for update.
+MIN_VDISK_SIZE_FULL=6072
+MIN_STATEFUL_FS_SIZE_FULL=2048
\ No newline at end of file
diff --git a/lib/cros_vm_lib.sh b/lib/cros_vm_lib.sh
index 61d575bfff..c47d11de33 100644
--- a/lib/cros_vm_lib.sh
+++ b/lib/cros_vm_lib.sh
@@ -4,6 +4,8 @@
 #
 # Common vm functions for use in crosutils.
 
+. "$(dirname "$0")/cros_vm_constants.sh"
+
 DEFINE_string kvm_pid "" \
   "Use this pid file.  If it exists and is set, use the vm specified by pid."
 DEFINE_boolean no_graphics ${FLAGS_FALSE} "Runs the KVM instance silently."
@@ -11,7 +13,6 @@ DEFINE_boolean persist "${FLAGS_FALSE}" "Persist vm."
 DEFINE_boolean snapshot ${FLAGS_FALSE} "Don't commit changes to image."
 DEFINE_integer ssh_port 9222 "Port to tunnel ssh traffic over."
 
-
 KVM_PID_FILE=/tmp/kvm.$$.pid
 
 function get_pid() {
@@ -47,7 +48,7 @@ function start_kvm() {
       snapshot="-snapshot"
     fi
 
-    sudo kvm -m 1024 \
+    sudo kvm -m ${DEFAULT_MEM} \
       -vga std \
       -pidfile "${KVM_PID_FILE}" \
       -daemonize \