Libvirt's "domcapabilities" command has a way to state whether certain graphic frontends are available in QEMU or not. Originally, libvirt looked at the "--help" output of the QEMU binary to determine whether SDL was available or not (by looking for the "-sdl" parameter in the help text), but since libvirt stopped doing this analysis of the help text, the detection of SDL is currently broken, see: https://bugzilla.redhat.com/show_bug.cgi?id=1790902 QEMU should provide a way via the QMP interface instead. A simple way, without introducing additional commands, is to make the DisplayType enum entries conditional, so that the enum only contains the entries if the corresponding CONFIG_xxx switches have been set. This of course only gives an indication which possibilities have been enabled during compile-time of QEMU (and does not take into account whether modules are later available or not for example - for this we'd need a separate command), but anyway, this should already be good enough for the above bug ticket, and it's a good idea anyway to make the QMP interface conditional here, so let's simply do it. Signed-off-by: Thomas Huth <thuth(a)redhat.com&gt; --- v2: Make gtk, curses and egl also conditional qapi/ui.json | 23 +++++++++++++++++------ softmmu/vl.c | 20 +++++++++++++++++--- ui/console.c | 8 +++++++- 3 files changed, 41 insertions(+), 10 deletions(-) diff --git a/qapi/ui.json b/qapi/ui.json index 1052ca9c38..6a667a0abf 100644 --- a/qapi/ui.json +++ b/qapi/ui.json @@ -1126,9 +1126,16 @@ # ## { 'enum' : 'DisplayType', - 'data' : [ 'default', 'none', 'gtk', 'sdl', - 'egl-headless', 'curses', 'cocoa', - 'spice-app'] } + 'data' : [ + { 'name': 'default' }, + { 'name': 'none' }, + { 'name': 'gtk', 'if': 'defined(CONFIG_GTK)' }, + { 'name': 'sdl', 'if': 'defined(CONFIG_SDL)' }, + { 'name': 'egl-headless', + 'if': 'defined(CONFIG_OPENGL) && defined(CONFIG_GBM)' }, + { 'name': 'curses', 'if': 'defined(CONFIG_CURSES)' }, + { 'name': 'cocoa', 'if': 'defined(CONFIG_COCOA)' }, + { 'name': 'spice-app', 'if': 'defined(CONFIG_SPICE)'} ] } ## # @DisplayOptions: @@ -1152,9 +1159,13 @@ '*show-cursor' : 'bool', '*gl' : 'DisplayGLMode' }, 'discriminator' : 'type', - 'data' : { 'gtk' : 'DisplayGTK', - 'curses' : 'DisplayCurses', - 'egl-headless' : 'DisplayEGLHeadless'} } + 'data' : { + 'gtk': { 'type': 'DisplayGTK', 'if': 'defined(CONFIG_GTK)' }, + 'curses': { 'type': 'DisplayCurses', 'if': 'defined(CONFIG_CURSES)' }, + 'egl-headless': { 'type': 'DisplayEGLHeadless', + 'if': 'defined(CONFIG_OPENGL) && defined(CONFIG_GBM)' } + } +} ## # @query-display-options: diff --git a/softmmu/vl.c b/softmmu/vl.c index 326c1e9080..fc103c2cb2 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -1068,6 +1068,7 @@ static void parse_display(const char *p) * Not clear yet what happens to them long-term. Should * replaced by something better or deprecated and dropped. */ +#if defined(CONFIG_SDL) dpy.type = DISPLAY_TYPE_SDL; while (*opts) { const char *nextopt; @@ -1131,6 +1132,10 @@ static void parse_display(const char *p) } opts = nextopt; } +#else + error_report("SDL display supported is not available in this binary"); + exit(1); +#endif } else if (strstart(p, "vnc", &opts)) { /* * vnc isn't a (local) DisplayType but a protocol for remote @@ -1867,13 +1872,22 @@ static void qemu_apply_machine_options(void) static void qemu_create_early_backends(void) { MachineClass *machine_class = MACHINE_GET_CLASS(current_machine); +#if defined(CONFIG_SDL) + const bool use_sdl = (dpy.type == DISPLAY_TYPE_SDL); +#else + const bool use_sdl = false; +#endif +#if defined(CONFIG_GTK) + const bool use_gtk = (dpy.type == DISPLAY_TYPE_GTK); +#else + const bool use_gtk = false; +#endif - if ((alt_grab || ctrl_grab) && dpy.type != DISPLAY_TYPE_SDL) { + if ((alt_grab || ctrl_grab) && !use_sdl) { error_report("-alt-grab and -ctrl-grab are only valid " "for SDL, ignoring option"); } - if (dpy.has_window_close && - (dpy.type != DISPLAY_TYPE_GTK && dpy.type != DISPLAY_TYPE_SDL)) { + if (dpy.has_window_close && !use_gtk && !use_sdl) { error_report("-no-quit is only valid for GTK and SDL, " "ignoring option"); } diff --git a/ui/console.c b/ui/console.c index 2de5f4105b..1103b65314 100644 --- a/ui/console.c +++ b/ui/console.c @@ -2370,13 +2370,19 @@ void qemu_display_register(QemuDisplay *ui) bool qemu_display_find_default(DisplayOptions *opts) { static DisplayType prio[] = { +#if defined(CONFIG_GTK) DISPLAY_TYPE_GTK, +#endif +#if defined(CONFIG_SDL) DISPLAY_TYPE_SDL, +#endif +#if defined(CONFIG_COCOA) DISPLAY_TYPE_COCOA +#endif }; int i; - for (i = 0; i < ARRAY_SIZE(prio); i++) { + for (i = 0; i < (int)ARRAY_SIZE(prio); i++) { if (dpys[prio[i]] == NULL) { ui_module_load_one(DisplayType_str(prio[i])); } -- 2.27.0