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[Qemu-devel] [RfC PATCH] hid: handle full ptr queues in post_load
From: |
Gerd Hoffmann |
Subject: |
[Qemu-devel] [RfC PATCH] hid: handle full ptr queues in post_load |
Date: |
Thu, 27 Nov 2014 10:04:12 +0100 |
Cc: Gonglei <address@hidden>
Cc: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Gerd Hoffmann <address@hidden>
---
hw/input/hid.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/hw/input/hid.c b/hw/input/hid.c
index 8f6fbb3..6fb963f 100644
--- a/hw/input/hid.c
+++ b/hw/input/hid.c
@@ -519,6 +519,27 @@ static int hid_post_load(void *opaque, int version_id)
HIDState *s = opaque;
hid_set_next_idle(s);
+
+ if (s->n == QUEUE_LENGTH && (s->kind == HID_TABLET ||
+ s->kind == HID_MOUSE)) {
+ /*
+ * Handle ptr device migration from old qemu with full queue.
+ *
+ * Throw away everything but the last event, so we propagate
+ * at least the current button state to the guest. Also keep
+ * current position for the tablet, signal "no motion" for the
+ * mouse.
+ */
+ HIDPointerEvent evt;
+ evt = s->ptr.queue[(s->head+s->n) & QUEUE_MASK];
+ if (s->kind == HID_MOUSE) {
+ evt.xdx = 0;
+ evt.ydy = 0;
+ }
+ s->ptr.queue[0] = evt;
+ s->head = 0;
+ s->n = 1;
+ }
return 0;
}
--
1.8.3.1
- [Qemu-devel] [RfC PATCH] hid: handle full ptr queues in post_load,
Gerd Hoffmann <=