diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 3ce95e8..52649b4 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -205,6 +205,41 @@ int virtio_serial_close(VirtIOSerialPort *port)
     return 0;
 }
 
+void virtio_serial_resize_console(VirtIOSerialPort *port, int rows, int cols)
+{
+    struct virtio_console_control cpkt;
+    struct {
+        uint16_t rows;
+        uint16_t cols;
+    } size;
+    uint8_t *buffer;
+    size_t buffer_len;
+
+    if (!use_multiport(port->vser)) {
+        port->vser->config.rows = rows;
+        port->vser->config.cols = cols;
+
+        virtio_notify_config(&port->vser->vdev);
+        return;
+    }
+
+    /* For MULTIPORT case, each port can have a different size */
+    stw_p(&cpkt.event, VIRTIO_CONSOLE_RESIZE);
+    stw_p(&cpkt.value, 1);
+
+    stw_p(&size.rows, rows);
+    stw_p(&size.cols, cols);
+
+    buffer_len = sizeof(cpkt) + sizeof(size);
+    buffer = qemu_malloc(buffer_len);
+
+    memcpy(buffer, &cpkt, sizeof(cpkt));
+    memcpy(buffer + sizeof(cpkt), &size, sizeof(size));
+
+    send_control_msg(port, buffer, buffer_len);
+    qemu_free(buffer);
+}
+
 /* Individual ports/apps call this function to write to the guest. */
 ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
                             size_t size)
@@ -425,6 +460,7 @@ static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
 
     vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
 
+    features |= (1 << VIRTIO_CONSOLE_F_SIZE);
     if (vser->bus->max_nr_ports > 1) {
         features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
     }
diff --git a/hw/virtio-serial.h b/hw/virtio-serial.h
index a93b545..912287c 100644
--- a/hw/virtio-serial.h
+++ b/hw/virtio-serial.h
@@ -25,14 +25,18 @@
 #define VIRTIO_ID_CONSOLE		3
 
 /* Features supported */
+#define VIRTIO_CONSOLE_F_SIZE		0
 #define VIRTIO_CONSOLE_F_MULTIPORT	1
 
 #define VIRTIO_CONSOLE_BAD_ID           (~(uint32_t)0)
 
 struct virtio_console_config {
     /*
-     * These two fields are used by VIRTIO_CONSOLE_F_SIZE which
-     * isn't implemented here yet
+     * These two fields are unused if multiport is enabled.  When
+     * multiport is disabled, they hold the size of the underlying
+     * chardev.  When a chardev is resized, the guest is notified by a
+     * config space update.  When multiport is enabled, a control
+     * message is sent instead.
      */
     uint16_t cols;
     uint16_t rows;
@@ -165,6 +169,11 @@ int virtio_serial_open(VirtIOSerialPort *port);
 int virtio_serial_close(VirtIOSerialPort *port);
 
 /*
+ * Notify resize to the guest
+ */
+void virtio_serial_resize_console(VirtIOSerialPort *port, int rows, int cols);
+
+/*
  * Send data to Guest
  */
 ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,