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vnc: add configurable keyboard delay 

Limits the rate kbd events from the vnc server are forwarded to the
guest, so input devices which are typically low-bandwidth can keep
up even on bulky input.

v2: update documentation too.
v3: spell fixes.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Yang Hongyang <hongyang.yang@easystack.cn>
Message-id: 1464762150-25817-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-06-01 08:22:30 +02:00
parent 8efa5f29f8
commit c5ce833344
3 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
qemu-options.hx
View File

@ -1410,6 +1410,14 @@ everybody else. 'ignore' completely ignores the shared flag and
allows everybody connect unconditionally. Doesn't conform to the rfb
spec but is traditional QEMU behavior.
@item key-delay-ms
Set keyboard delay, for key down and key up events, in milliseconds.
Default is 1. Keyboards are low-bandwidth devices, so this slowdown
can help the device and guest to keep up and not lose events in case
events are arriving in bulk. Possible causes for the latter are flaky
network connections, or scripts for automated testing.
@end table
ETEXI

13
ui/vnc.c
View File

@ -1629,6 +1629,7 @@ static void reset_keys(VncState *vs)
for(i = 0; i < 256; i++) {
if (vs->modifiers_state[i]) {
qemu_input_event_send_key_number(vs->vd->dcl.con, i, false);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
vs->modifiers_state[i] = 0;
}
}
@ -1638,9 +1639,9 @@ static void press_key(VncState *vs, int keysym)
{
int keycode = keysym2scancode(vs->vd->kbd_layout, keysym) & SCANCODE_KEYMASK;
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, true);
qemu_input_event_send_key_delay(0);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, false);
qemu_input_event_send_key_delay(0);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
}
static int current_led_state(VncState *vs)
@ -1792,6 +1793,7 @@ static void do_key_event(VncState *vs, int down, int keycode, int sym)
if (qemu_console_is_graphic(NULL)) {
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, down);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
} else {
bool numlock = vs->modifiers_state[0x45];
bool control = (vs->modifiers_state[0x1d] ||
@ -1913,6 +1915,7 @@ static void vnc_release_modifiers(VncState *vs)
continue;
}
qemu_input_event_send_key_number(vs->vd->dcl.con, keycode, false);
qemu_input_event_send_key_delay(vs->vd->key_delay_ms);
}
}
@ -3277,6 +3280,9 @@ static QemuOptsList qemu_vnc_opts = {
},{
.name = "lock-key-sync",
.type = QEMU_OPT_BOOL,
},{
.name = "key-delay-ms",
.type = QEMU_OPT_NUMBER,
},{
.name = "sasl",
.type = QEMU_OPT_BOOL,
@ -3515,6 +3521,7 @@ void vnc_display_open(const char *id, Error **errp)
#endif
int acl = 0;
int lock_key_sync = 1;
int key_delay_ms;
if (!vs) {
error_setg(errp, "VNC display not active");
@ -3633,6 +3640,7 @@ void vnc_display_open(const char *id, Error **errp)
reverse = qemu_opt_get_bool(opts, "reverse", false);
lock_key_sync = qemu_opt_get_bool(opts, "lock-key-sync", true);
key_delay_ms = qemu_opt_get_number(opts, "key-delay-ms", 1);
sasl = qemu_opt_get_bool(opts, "sasl", false);
#ifndef CONFIG_VNC_SASL
if (sasl) {
@ -3764,6 +3772,7 @@ void vnc_display_open(const char *id, Error **errp)
}
#endif
vs->lock_key_sync = lock_key_sync;
vs->key_delay_ms = key_delay_ms;
device_id = qemu_opt_get(opts, "display");
if (device_id) {

1
ui/vnc.h
View File

@ -155,6 +155,7 @@ struct VncDisplay
DisplayChangeListener dcl;
kbd_layout_t *kbd_layout;
int lock_key_sync;
int key_delay_ms;
QemuMutex mutex;
QEMUCursor *cursor;