[Qemu-devel] [PATCH v2] spice-input: migrate ledstate

[Alon Levy <alevy@redhat.com>]

The caps/scroll/num lock state is not tracked by the ps2 device, but by
spice-input QemuSpiceKbd->ledstate. To fix losing it across migration,
and then having the server send caps/scroll/nums keys when the client
sends a SPICE_MSGC_INPUTS_KEY_MODIFIERS, migrate it.

RHBZ# 729294

Signed-off-by: Alon Levy <alevy@redhat.com>
---
v2: fix vmstate name from spice-input to spice-input-kbd
---
 trace-events     |    3 +++
 ui/spice-input.c |   24 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/trace-events b/trace-events
index 63d8c8e..605dc79 100644
--- a/trace-events
+++ b/trace-events
@@ -538,3 +538,6 @@ esp_mem_writeb_cmd_ensel(uint32_t val) "Enable selection (%2.2x)"
 # monitor.c
 handle_qmp_command(void *mon, const char *cmd_name) "mon %p cmd_name \"%s\""
 monitor_protocol_emitter(void *mon) "mon %p"
+
+# ui/spice-input.c
+disable spice_input_post_load(int ledstate) "leds %d"
diff --git a/ui/spice-input.c b/ui/spice-input.c
index af4223d..d873019 100644
--- a/ui/spice-input.c
+++ b/ui/spice-input.c
@@ -26,6 +26,8 @@
 #include "qemu-common.h"
 #include "qemu-spice.h"
 #include "console.h"
+#include "hw/hw.h"
+#include "trace.h"
 
 /* keyboard bits */
 
@@ -195,6 +197,27 @@ static void mouse_mode_notifier(Notifier *notifier, void *data)
     pointer->absolute = is_absolute;
 }
 
+static int qemu_spice_input_post_load(void *opaque, int version_id)
+{
+    QemuSpiceKbd *s = (QemuSpiceKbd *)opaque;
+
+    trace_spice_input_post_load(s->ledstate);
+    kbd_leds(s, s->ledstate);
+    return 0;
+}
+
+static const VMStateDescription vmstate_spice_kbd = {
+    .name = "spice-input-kbd",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .post_load = qemu_spice_input_post_load,
+    .fields      = (VMStateField[]) {
+        VMSTATE_INT32(ledstate, QemuSpiceKbd),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 void qemu_spice_input_init(void)
 {
     QemuSpiceKbd *kbd;
@@ -204,6 +227,7 @@ void qemu_spice_input_init(void)
     kbd->sin.base.sif = &kbd_interface.base;
     qemu_spice_add_interface(&kbd->sin.base);
     qemu_add_led_event_handler(kbd_leds, kbd);
+    vmstate_register(NULL, 0, &vmstate_spice_kbd, kbd);
 
     pointer = g_malloc0(sizeof(*pointer));
     pointer->mouse.base.sif  = &mouse_interface.base;
-- 
1.7.6.4