From 143c04c7e0639e53086519592ead15d2556bfbf2 Mon Sep 17 00:00:00 2001 From: Geoffrey McRae Date: Mon, 7 May 2018 23:01:46 +1000 Subject: ps2: Clear the PS/2 queue and obey disable This allows guest's to correctly reinitialize and identify the mouse should the guest decide to re-scan or reset during mouse input events. When the guest sends the "Identify" command, due to the PC's hardware architecutre it is impossible to reliably determine the response from the command amongst other streaming data, such as mouse or keyboard events. Standard practice is for the guest to disable the device and then issue the identify command, so this must be obeyed. Signed-off-by: Geoffrey McRae Message-Id: <20180507150303.7486B381924@moya.office.hostfission.com> Signed-off-by: Gerd Hoffmann --- hw/input/ps2.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'hw/input') diff --git a/hw/input/ps2.c b/hw/input/ps2.c index 06f5d2a..4abc8ce 100644 --- a/hw/input/ps2.c +++ b/hw/input/ps2.c @@ -232,6 +232,11 @@ static void ps2_keyboard_event(DeviceState *dev, QemuConsole *src, uint16_t keycode = 0; int mod; + /* do not process events while disabled to prevent stream corruption */ + if (!s->scan_enabled) { + return; + } + qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); assert(evt->type == INPUT_EVENT_KIND_KEY); qcode = qemu_input_key_value_to_qcode(key->key); @@ -673,6 +678,11 @@ static void ps2_mouse_sync(DeviceState *dev) { PS2MouseState *s = (PS2MouseState *)dev; + /* do not sync while disabled to prevent stream corruption */ + if (!(s->mouse_status & MOUSE_STATUS_ENABLED)) { + return; + } + if (s->mouse_buttons) { qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); } @@ -776,6 +786,7 @@ void ps2_write_mouse(void *opaque, int val) s->mouse_resolution = 2; s->mouse_status = 0; s->mouse_type = 0; + ps2_reset_queue(&s->common); ps2_queue(&s->common, AUX_ACK); ps2_queue(&s->common, 0xaa); ps2_queue(&s->common, s->mouse_type); -- cgit v1.1