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hid: handle full ptr queues in post_load

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Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
This commit is contained in:
Gerd Hoffmann 2014-11-27 10:02:35 +01:00
parent 4083ae311d
commit ba4d26064e
1 changed files with 21 additions and 0 deletions
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21
hw/input/hid.c
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@ -514,6 +514,27 @@ 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;
}