We already print availabled devices with "-device help", or available backends with "-netdev help" or "-chardev help". Let's provide a way for the users to query the available display backends, too.
Signed-off-by: Thomas Huth <h...@tuxfamily.org> --- include/ui/console.h | 1 + ui/console.c | 12 ++++++++++++ vl.c | 5 +++++ 3 files changed, 18 insertions(+) diff --git a/include/ui/console.h b/include/ui/console.h index f981696848..b7e1a8e6c0 100644 --- a/include/ui/console.h +++ b/include/ui/console.h @@ -440,6 +440,7 @@ void qemu_display_register(QemuDisplay *ui); bool qemu_display_find_default(DisplayOptions *opts); void qemu_display_early_init(DisplayOptions *opts); void qemu_display_init(DisplayState *ds, DisplayOptions *opts); +void qemu_display_help(void); /* vnc.c */ void vnc_display_init(const char *id, Error **errp); diff --git a/ui/console.c b/ui/console.c index 82d1ddac9c..2c92eb2377 100644 --- a/ui/console.c +++ b/ui/console.c @@ -2330,6 +2330,18 @@ void qemu_display_init(DisplayState *ds, DisplayOptions *opts) dpys[opts->type]->init(ds, opts); } +void qemu_display_help(void) +{ + int idx; + + printf("Available display backend types:\n"); + for (idx = 0; idx < DISPLAY_TYPE__MAX; idx++) { + if (dpys[idx]) { + printf("%s\n", DisplayType_str(dpys[idx]->type)); + } + } +} + void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp) { int val; diff --git a/vl.c b/vl.c index 4489cfb2bb..3e215beb43 100644 --- a/vl.c +++ b/vl.c @@ -2006,6 +2006,11 @@ static void parse_display(const char *p) { const char *opts; + if (is_help_option(p)) { + qemu_display_help(); + exit(0); + } + if (strstart(p, "sdl", &opts)) { /* * sdl DisplayType needs hand-crafted parser instead of -- 2.21.0