tools/libxl: Replace deprecated -soundhw on QEMU command line

-soundhw is deprecated since 825ff02911c9 ("audio: add soundhw
deprecation notice"), QEMU v5.1, and is been remove for upcoming v7.1
by 039a68373c45 ("introduce -audio as a replacement for -soundhw").

Instead we can just add the sound card with "-device", for most option
that "-soundhw" could handle. "-device" is an option that existed
before QEMU 1.0, and could already be used to add audio hardware.

The list of possible option for libxl's "soundhw" is taken the list
from QEMU 7.0.

The list of options for "soundhw" are listed in order of preference in
the manual. The first three (hda, ac97, es1370) are PCI devices and
easy to test on Linux, and the last four are ISA devices which doesn't
seems to work out of the box on linux.

The sound card 'pcspk' isn't listed even if it used to be accepted by
'-soundhw' because QEMU crash when trying to add it to a Xen domain.
Also, it wouldn't work with "-device" might need to be "-machine
pcspk-audiodev=default" instead.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Jason Andryuk <jandryuk@gmail.com>

docs/man/xl.cfg.5.pod.in

@@ -2555,9 +2555,9 @@ The form serial=DEVICE is also accepted for backwards compatibility.
 
 =item B<soundhw="DEVICE">
 
-Select the virtual sound card to expose to the guest. The valid
-devices are defined by the device model configuration, please see the
-B<qemu(1)> manpage for details. The default is not to export any sound
+Select the virtual sound card to expose to the guest. The valid devices are
+B<hda>, B<ac97>, B<es1370>, B<adlib>, B<cs4231a>, B<gus>, B<sb16> if there are
+available with the device model QEMU. The default is not to export any sound
 device.
 
 =item B<vkb_device=BOOLEAN>

tools/libs/light/libxl_dm.c

@@ -1204,6 +1204,7 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
     uint64_t ram_size;
     const char *path, *chardev;
     bool is_stubdom = libxl_defbool_val(b_info->device_model_stubdomain);
+    int rc;
 
     dm_args = flexarray_make(gc, 16, 1);
     dm_envs = flexarray_make(gc, 16, 1);
@@ -1531,7 +1532,23 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
             }
         }
         if (b_info->u.hvm.soundhw) {
-            flexarray_vappend(dm_args, "-soundhw", b_info->u.hvm.soundhw, NULL);
+            libxl__qemu_soundhw soundhw;
+
+            rc = libxl__qemu_soundhw_from_string(b_info->u.hvm.soundhw, &soundhw);
+            if (rc) {
+                LOGD(ERROR, guest_domid, "Unknown soundhw option '%s'", b_info->u.hvm.soundhw);
+                return ERROR_INVAL;
+            }
+
+            switch (soundhw) {
+            case LIBXL__QEMU_SOUNDHW_HDA:
+                flexarray_vappend(dm_args, "-device", "intel-hda",
+                                  "-device", "hda-duplex", NULL);
+                break;
+            default:
+                flexarray_append_pair(dm_args, "-device",
+                                      (char*)libxl__qemu_soundhw_to_string(soundhw));
+            }
         }
         if (!libxl__acpi_defbool_val(b_info)) {
             flexarray_append(dm_args, "-no-acpi");

tools/libs/light/libxl_types_internal.idl

@@ -56,3 +56,13 @@ libxl__device_action = Enumeration("device_action", [
     (1, "ADD"),
     (2, "REMOVE"),
     ])
+
+libxl__qemu_soundhw = Enumeration("qemu_soundhw", [
+    (1, "ac97"),
+    (2, "adlib"),
+    (3, "cs4231a"),
+    (4, "es1370"),
+    (5, "gus"),
+    (6, "hda"),
+    (7, "sb16"),
+    ])