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ps2: Fix mouse stream corruption due to lost data 

This fixes an issue by adding bounds checking to multi-byte packets
where the PS/2 mouse data stream may become corrupted due to data being
discarded when the PS/2 ringbuffer is full.

Interrupts for Multi-byte responses are postponed until the final byte
has been queued.

These changes fix a bug where windows guests drop the mouse device
entirely requring the guest to be restarted.

Signed-off-by: Geoffrey McRae <geoff@hostfission.com>
Message-Id: <20180507150310.2FEA0381924@moya.office.hostfission.com>

[ kraxel: codestyle fixes ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Geoffrey McRae 2018-05-07 23:13:12 +10:00 committed by Gerd Hoffmann
parent 143c04c7e0
commit 7abe7eb294
2 changed files with 100 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

116
hw/input/ps2.c
View File

@ -188,16 +188,64 @@ static void ps2_reset_queue(PS2State *s)
q->count = 0;
}
void ps2_queue(PS2State *s, int b)
void ps2_queue_noirq(PS2State *s, int b)
{
PS2Queue *q = &s->queue;
if (q->count >= PS2_QUEUE_SIZE - 1)
if (q->count == PS2_QUEUE_SIZE) {
return;
}
q->data[q->wptr] = b;
if (++q->wptr == PS2_QUEUE_SIZE)
q->wptr = 0;
q->count++;
}
void ps2_raise_irq(PS2State *s)
{
s->update_irq(s->update_arg, 1);
}
void ps2_queue(PS2State *s, int b)
{
ps2_queue_noirq(s, b);
s->update_irq(s->update_arg, 1);
}
void ps2_queue_2(PS2State *s, int b1, int b2)
{
if (PS2_QUEUE_SIZE - s->queue.count < 2) {
return;
}
ps2_queue_noirq(s, b1);
ps2_queue_noirq(s, b2);
s->update_irq(s->update_arg, 1);
}
void ps2_queue_3(PS2State *s, int b1, int b2, int b3)
{
if (PS2_QUEUE_SIZE - s->queue.count < 3) {
return;
}
ps2_queue_noirq(s, b1);
ps2_queue_noirq(s, b2);
ps2_queue_noirq(s, b3);
s->update_irq(s->update_arg, 1);
}
void ps2_queue_4(PS2State *s, int b1, int b2, int b3, int b4)
{
if (PS2_QUEUE_SIZE - s->queue.count < 4) {
return;
}
ps2_queue_noirq(s, b1);
ps2_queue_noirq(s, b2);
ps2_queue_noirq(s, b3);
ps2_queue_noirq(s, b4);
s->update_irq(s->update_arg, 1);
}
@ -501,13 +549,17 @@ void ps2_write_keyboard(void *opaque, int val)
ps2_queue(&s->common, KBD_REPLY_RESEND);
break;
case KBD_CMD_GET_ID:
ps2_queue(&s->common, KBD_REPLY_ACK);
/* We emulate a MF2 AT keyboard here */
ps2_queue(&s->common, KBD_REPLY_ID);
if (s->translate)
ps2_queue(&s->common, 0x41);
ps2_queue_3(&s->common,
KBD_REPLY_ACK,
KBD_REPLY_ID,
0x41);
else
ps2_queue(&s->common, 0x83);
ps2_queue_3(&s->common,
KBD_REPLY_ACK,
KBD_REPLY_ID,
0x83);
break;
case KBD_CMD_ECHO:
ps2_queue(&s->common, KBD_CMD_ECHO);
@ -534,8 +586,9 @@ void ps2_write_keyboard(void *opaque, int val)
break;
case KBD_CMD_RESET:
ps2_reset_keyboard(s);
ps2_queue(&s->common, KBD_REPLY_ACK);
ps2_queue(&s->common, KBD_REPLY_POR);
ps2_queue_2(&s->common,
KBD_REPLY_ACK,
KBD_REPLY_POR);
break;
default:
ps2_queue(&s->common, KBD_REPLY_RESEND);
@ -544,8 +597,10 @@ void ps2_write_keyboard(void *opaque, int val)
break;
case KBD_CMD_SCANCODE:
if (val == 0) {
if (s->common.queue.count <= PS2_QUEUE_SIZE - 2) {
ps2_queue(&s->common, KBD_REPLY_ACK);
ps2_put_keycode(s, s->scancode_set);
}
} else if (val >= 1 && val <= 3) {
s->scancode_set = val;
ps2_queue(&s->common, KBD_REPLY_ACK);
@ -577,11 +632,16 @@ void ps2_keyboard_set_translation(void *opaque, int mode)
s->translate = mode;
}
static void ps2_mouse_send_packet(PS2MouseState *s)
static int ps2_mouse_send_packet(PS2MouseState *s)
{
const int needed = 3 + (s->mouse_type - 2);
unsigned int b;
int dx1, dy1, dz1;
if (PS2_QUEUE_SIZE - s->common.queue.count < needed) {
return 0;
}
dx1 = s->mouse_dx;
dy1 = s->mouse_dy;
dz1 = s->mouse_dz;
@ -595,9 +655,9 @@ static void ps2_mouse_send_packet(PS2MouseState *s)
else if (dy1 < -127)
dy1 = -127;
b = 0x08 | ((dx1 < 0) << 4) | ((dy1 < 0) << 5) | (s->mouse_buttons & 0x07);
ps2_queue(&s->common, b);
ps2_queue(&s->common, dx1 & 0xff);
ps2_queue(&s->common, dy1 & 0xff);
ps2_queue_noirq(&s->common, b);
ps2_queue_noirq(&s->common, dx1 & 0xff);
ps2_queue_noirq(&s->common, dy1 & 0xff);
/* extra byte for IMPS/2 or IMEX */
switch(s->mouse_type) {
default:
@ -607,7 +667,7 @@ static void ps2_mouse_send_packet(PS2MouseState *s)
dz1 = 127;
else if (dz1 < -127)
dz1 = -127;
ps2_queue(&s->common, dz1 & 0xff);
ps2_queue_noirq(&s->common, dz1 & 0xff);
break;
case 4:
if (dz1 > 7)
@ -615,15 +675,19 @@ static void ps2_mouse_send_packet(PS2MouseState *s)
else if (dz1 < -7)
dz1 = -7;
b = (dz1 & 0x0f) | ((s->mouse_buttons & 0x18) << 1);
ps2_queue(&s->common, b);
ps2_queue_noirq(&s->common, b);
break;
}
ps2_raise_irq(&s->common);
trace_ps2_mouse_send_packet(s, dx1, dy1, dz1, b);
/* update deltas */
s->mouse_dx -= dx1;
s->mouse_dy -= dy1;
s->mouse_dz -= dz1;
return 1;
}
static void ps2_mouse_event(DeviceState *dev, QemuConsole *src,
@ -687,10 +751,9 @@ static void ps2_mouse_sync(DeviceState *dev)
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
}
if (!(s->mouse_status & MOUSE_STATUS_REMOTE)) {
while (s->common.queue.count < PS2_QUEUE_SIZE - 4) {
/* if not remote, send event. Multiple events are sent if
too big deltas */
ps2_mouse_send_packet(s);
while (ps2_mouse_send_packet(s)) {
if (s->mouse_dx == 0 && s->mouse_dy == 0 && s->mouse_dz == 0)
break;
}
@ -749,8 +812,9 @@ void ps2_write_mouse(void *opaque, int val)
ps2_queue(&s->common, AUX_ACK);
break;
case AUX_GET_TYPE:
ps2_queue(&s->common, AUX_ACK);
ps2_queue(&s->common, s->mouse_type);
ps2_queue_2(&s->common,
AUX_ACK,
s->mouse_type);
break;
case AUX_SET_RES:
case AUX_SET_SAMPLE:
@ -758,10 +822,11 @@ void ps2_write_mouse(void *opaque, int val)
ps2_queue(&s->common, AUX_ACK);
break;
case AUX_GET_SCALE:
ps2_queue(&s->common, AUX_ACK);
ps2_queue(&s->common, s->mouse_status);
ps2_queue(&s->common, s->mouse_resolution);
ps2_queue(&s->common, s->mouse_sample_rate);
ps2_queue_4(&s->common,
AUX_ACK,
s->mouse_status,
s->mouse_resolution,
s->mouse_sample_rate);
break;
case AUX_POLL:
ps2_queue(&s->common, AUX_ACK);
@ -787,9 +852,10 @@ void ps2_write_mouse(void *opaque, int val)
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);
ps2_queue_3(&s->common,
AUX_ACK,
0xaa,
s->mouse_type);
break;
default:
break;

5
include/hw/input/ps2.h
View File

@ -37,7 +37,12 @@ void *ps2_mouse_init(void (*update_irq)(void *, int), void *update_arg);
void ps2_write_mouse(void *, int val);
void ps2_write_keyboard(void *, int val);
uint32_t ps2_read_data(PS2State *s);
void ps2_queue_noirq(PS2State *s, int b);
void ps2_raise_irq(PS2State *s);
void ps2_queue(PS2State *s, int b);
void ps2_queue_2(PS2State *s, int b1, int b2);
void ps2_queue_3(PS2State *s, int b1, int b2, int b3);
void ps2_queue_4(PS2State *s, int b1, int b2, int b3, int b4);
void ps2_keyboard_set_translation(void *opaque, int mode);
void ps2_mouse_fake_event(void *opaque);