Add HD Audio device to guest via config

lib/vm-run

@@ -192,6 +192,7 @@ vm::run(){
     vm::bhyve_device_passthru
     vm::bhyve_device_fbuf
     vm::bhyve_device_mouse
+    vm::bhyve_device_sound
     vm::bhyve_device_console
 
     vm::lock
@@ -718,6 +719,16 @@ vm::bhyve_device_mouse(){
     fi
 }
 
+vm::bhyve_device_sound(){
+    local _play
+    config::get "_play" "sound_play" "/dev/dsp0"
+
+    if config::yesno "sound"; then
+        _devices="${_devices} -s ${_slot}:0,hda,play=${_play}"
+        _slot=$((_slot + 1))
+    fi
+}
+
 # add virtio_console devices to the guest
 #
 # @modifies _devices _slot

vm.8

@@ -1457,6 +1457,15 @@ Set this option to
 in order to provide an XHCI mouse device to the guest.
 This tracks much better than the default PS2 mouse in VNC settings, although
 this mouse may not supported by older guests.
+.It sound
+Set this option to
+.Sy yes
+in order to provide HD Audio Emulation to the guest. Please see 
+.Sy bhyve(8) 
+for details.
+.It sound_play
+Set this to the desired audio output device of the host to the guest. Defaults to
+.Sy '/dev/dsp0'
 .It virt_consoleX
 Allows the creation of up to 16 virtio-console devices in the guest. The value
 to this option can be