display: add -display spice-app launching a Spice client

Add a new display backend that will configure Spice to allow a remote
client to control QEMU in a similar fashion as other QEMU display
backend/UI like GTK.

For this to work, it will set up Spice server with a unix socket, and
register a VC chardev that will be exposed as Spice ports. A QMP
monitor is also exposed as a Spice port, this allows the remote client
fuller qemu control and state handling.

- doesn't handle VC set_echo() - this doesn't seem a strong
  requirement, very few front-end use it
- spice options can be tweaked with other -spice arguments
- Windows support shouldn't be hard to do, but will probably use a TCP
  port instead
- we may want to watch the child process to quit automatically if it
  crashed

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Victor Toso <victortoso@redhat.com>
Message-id: 20190221110703.5775-12-marcandre.lureau@redhat.com

[ kraxel: squash incremental fix ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

qapi/ui.json

@@ -1110,12 +1110,17 @@
 #
 # @cocoa: The Cocoa user interface.
 #
+# @spice-app: Set up a Spice server and run the default associated
+#             application to connect to it. The server will redirect
+#             the serial console and QEMU monitors. (Since 4.0)
+#
 # Since: 2.12
 #
 ##
 { 'enum'    : 'DisplayType',
   'data'    : [ 'default', 'none', 'gtk', 'sdl',
-                'egl-headless', 'curses', 'cocoa' ] }
+                'egl-headless', 'curses', 'cocoa',
+                'spice-app'] }
 
 ##
 # @DisplayOptions:

qemu-options.hx

@@ -1211,6 +1211,7 @@ STEXI
 ETEXI
 
 DEF("display", HAS_ARG, QEMU_OPTION_display,
+    "-display spice-app[,gl=on|off]\n"
     "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
     "            [,window_close=on|off][,gl=on|core|es|off]\n"
     "-display gtk[,grab_on_hover=on|off][,gl=on|off]|\n"
@@ -1262,6 +1263,10 @@ Start a VNC server on display <arg>
 @item egl-headless
 Offload all OpenGL operations to a local DRI device. For any graphical display,
 this display needs to be paired with either VNC or SPICE displays.
+@item spice-app
+Start QEMU as a Spice server and launch the default Spice client
+application. The Spice server will redirect the serial consoles and
+QEMU monitors. (Since 4.0)
 @end table
 ETEXI
 

ui/Makefile.objs

@@ -49,6 +49,11 @@ curses.mo-objs := curses.o
 curses.mo-cflags := $(CURSES_CFLAGS)
 curses.mo-libs := $(CURSES_LIBS)
 
+common-obj-$(call land,$(CONFIG_SPICE),$(CONFIG_GIO)) += spice-app.mo
+spice-app.mo-objs := spice-app.o
+spice-app.mo-cflags := $(GIO_CFLAGS)
+spice-app.mo-libs := $(GIO_LIBS)
+
 common-obj-$(CONFIG_OPENGL) += shader.o
 common-obj-$(CONFIG_OPENGL) += console-gl.o
 common-obj-$(CONFIG_OPENGL) += egl-helpers.o

ui/spice-app.c

@@ -0,0 +1,202 @@
+/*
+ * QEMU external Spice client display driver
+ *
+ * Copyright (c) 2018 Marc-André Lureau <marcandre.lureau@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu/osdep.h"
+
+#include <gio/gio.h>
+
+#include "qemu-common.h"
+#include "ui/console.h"
+#include "qemu/config-file.h"
+#include "qemu/option.h"
+#include "qemu/cutils.h"
+#include "qapi/error.h"
+#include "io/channel-command.h"
+#include "chardev/spice.h"
+#include "sysemu/sysemu.h"
+
+static const char *tmp_dir;
+static char *app_dir;
+static char *sock_path;
+
+typedef struct VCChardev {
+    SpiceChardev parent;
+} VCChardev;
+
+#define TYPE_CHARDEV_VC "chardev-vc"
+#define VC_CHARDEV(obj) OBJECT_CHECK(VCChardev, (obj), TYPE_CHARDEV_VC)
+
+static ChardevBackend *
+chr_spice_backend_new(void)
+{
+    ChardevBackend *be = g_new0(ChardevBackend, 1);
+
+    be->type = CHARDEV_BACKEND_KIND_SPICEPORT;
+    be->u.spiceport.data = g_new0(ChardevSpicePort, 1);
+
+    return be;
+}
+
+static void vc_chr_open(Chardev *chr,
+                        ChardevBackend *backend,
+                        bool *be_opened,
+                        Error **errp)
+{
+    ChardevBackend *be;
+    const char *fqdn = NULL;
+
+    if (strstart(chr->label, "serial", NULL)) {
+        fqdn = "org.qemu.console.serial.0";
+    } else if (strstart(chr->label, "parallel", NULL)) {
+        fqdn = "org.qemu.console.parallel.0";
+    } else if (strstart(chr->label, "compat_monitor", NULL)) {
+        fqdn = "org.qemu.monitor.hmp.0";
+    }
+
+    be = chr_spice_backend_new();
+    be->u.spiceport.data->fqdn = fqdn ?
+        g_strdup(fqdn) : g_strdup_printf("org.qemu.console.%s", chr->label);
+    qemu_chr_open_spice_port(chr, be, be_opened, errp);
+    qapi_free_ChardevBackend(be);
+}
+
+static void vc_chr_set_echo(Chardev *chr, bool echo)
+{
+    /* TODO: set echo for frontends QMP and qtest */
+}
+
+static void char_vc_class_init(ObjectClass *oc, void *data)
+{
+    ChardevClass *cc = CHARDEV_CLASS(oc);
+
+    cc->parse = qemu_chr_parse_vc;
+    cc->open = vc_chr_open;
+    cc->chr_set_echo = vc_chr_set_echo;
+}
+
+static const TypeInfo char_vc_type_info = {
+    .name = TYPE_CHARDEV_VC,
+    .parent = TYPE_CHARDEV_SPICEPORT,
+    .instance_size = sizeof(VCChardev),
+    .class_init = char_vc_class_init,
+};
+
+static void spice_app_atexit(void)
+{
+    if (sock_path) {
+        unlink(sock_path);
+    }
+    if (tmp_dir) {
+        rmdir(tmp_dir);
+    }
+    g_free(sock_path);
+    g_free(app_dir);
+}
+
+static void spice_app_display_early_init(DisplayOptions *opts)
+{
+    QemuOpts *qopts;
+    ChardevBackend *be = chr_spice_backend_new();
+    GError *err = NULL;
+
+    if (opts->has_full_screen) {
+        error_report("spice-app full-screen isn't supported yet.");
+        exit(1);
+    }
+    if (opts->has_window_close) {
+        error_report("spice-app window-close isn't supported yet.");
+        exit(1);
+    }
+
+    atexit(spice_app_atexit);
+
+    if (qemu_name) {
+        app_dir = g_build_filename(g_get_user_runtime_dir(),
+                                   "qemu", qemu_name, NULL);
+        if (g_mkdir_with_parents(app_dir, S_IRWXU) < -1) {
+            error_report("Failed to create directory %s: %s",
+                         app_dir, strerror(errno));
+            exit(1);
+        }
+    } else {
+        app_dir = g_dir_make_tmp(NULL, &err);
+        tmp_dir = app_dir;
+        if (err) {
+            error_report("Failed to create temporary directory: %s",
+                         err->message);
+            exit(1);
+        }
+    }
+
+    type_register(&char_vc_type_info);
+
+    sock_path = g_strjoin("", app_dir, "/", "spice.sock", NULL);
+    qopts = qemu_opts_create(qemu_find_opts("spice"), NULL, 0, &error_abort);
+    qemu_opt_set(qopts, "disable-ticketing", "on", &error_abort);
+    qemu_opt_set(qopts, "unix", "on", &error_abort);
+    qemu_opt_set(qopts, "addr", sock_path, &error_abort);
+    qemu_opt_set(qopts, "image-compression", "off", &error_abort);
+    qemu_opt_set(qopts, "streaming-video", "off", &error_abort);
+    qemu_opt_set(qopts, "gl", opts->has_gl ? "on" : "off", &error_abort);
+    display_opengl = opts->has_gl;
+
+    be->u.spiceport.data->fqdn = g_strdup("org.qemu.monitor.qmp.0");
+    qemu_chardev_new("org.qemu.monitor.qmp", TYPE_CHARDEV_SPICEPORT,
+                     be, NULL, &error_abort);
+    qopts = qemu_opts_create(qemu_find_opts("mon"),
+                             NULL, 0, &error_fatal);
+    qemu_opt_set(qopts, "chardev", "org.qemu.monitor.qmp", &error_abort);
+    qemu_opt_set(qopts, "mode", "control", &error_abort);
+
+    qapi_free_ChardevBackend(be);
+}
+
+static void spice_app_display_init(DisplayState *ds, DisplayOptions *opts)
+{
+    GError *err = NULL;
+    gchar *uri;
+
+    uri = g_strjoin("", "spice+unix://", app_dir, "/", "spice.sock", NULL);
+    info_report("Launching display with URI: %s", uri);
+    g_app_info_launch_default_for_uri(uri, NULL, &err);
+    if (err) {
+        error_report("Failed to launch %s URI: %s", uri, err->message);
+        error_report("You need a capable Spice client, "
+                     "such as virt-viewer 8.0");
+        exit(1);
+    }
+    g_free(uri);
+}
+
+static QemuDisplay qemu_display_spice_app = {
+    .type       = DISPLAY_TYPE_SPICE_APP,
+    .early_init = spice_app_display_early_init,
+    .init       = spice_app_display_init,
+};
+
+static void register_spice_app(void)
+{
+    qemu_display_register(&qemu_display_spice_app);
+}
+
+type_init(register_spice_app);