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[Qemu-devel] [PATCH] ps2: set ps/2 output buffer size as the same as ker
From: |
arei.gonglei |
Subject: |
[Qemu-devel] [PATCH] ps2: set ps/2 output buffer size as the same as kernel |
Date: |
Thu, 24 Apr 2014 11:21:41 +0800 |
From: Gonglei <address@hidden>
According to the PS/2 Mouse/Keyboard Protocol, the keyboard outupt buffer size
is 16 bytes. And the PS2_QUEUE_SIZE 256 was introduced in Qemu from the very
beginning.
When I started a redhat5.6 32bit guest, meanwhile tapped the keyboard as
quickly as
possible, the screen would show me "i8042.c: No controller found". As a result,
I couldn't use the keyboard in the VNC client.
Previous discussion about the issue in maillist:
http://thread.gmane.org/gmane.comp.emulators.qemu/43294/focus=47180
This patch has been tested on redhat5.6 32-bit/suse11sp3 64-bit guests.
More easy meathod to reproduce:
1.boot a guest with libvirt.
2.connect to VNC client.
3.as you see the BIOS, bootloader, Linux booting, run the follow simply shell
script:
for((i=0;i<10000000;i++)) do virsh send-key redhat5.6 KEY_A; done
Actual results:
dmesg show "i8042.c: No controller found." And the keyboard is out of work.
Signed-off-by: Gonglei <address@hidden>
---
hw/input/ps2.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 51 insertions(+), 5 deletions(-)
diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index 3412079..d7fd1ef 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -71,10 +71,12 @@
#define MOUSE_STATUS_ENABLED 0x20
#define MOUSE_STATUS_SCALE21 0x10
-#define PS2_QUEUE_SIZE 256
+#define PS2_QUEUE_SIZE 16 /* Buffer size required by PS/2 protocol */
typedef struct {
- uint8_t data[PS2_QUEUE_SIZE];
+ /* Keep the data array 256 bytes long, which compatibility
+ with older qemu versions. */
+ uint8_t data[256];
int rptr, wptr, count;
} PS2Queue;
@@ -137,7 +139,7 @@ void ps2_queue(void *opaque, int b)
PS2State *s = (PS2State *)opaque;
PS2Queue *q = &s->queue;
- if (q->count >= PS2_QUEUE_SIZE)
+ if (q->count >= PS2_QUEUE_SIZE - 1)
return;
q->data[q->wptr] = b;
if (++q->wptr == PS2_QUEUE_SIZE)
@@ -375,7 +377,7 @@ static void ps2_mouse_event(void *opaque,
}
if (!(s->mouse_status & MOUSE_STATUS_REMOTE) &&
- (s->common.queue.count < (PS2_QUEUE_SIZE - 16))) {
+ (s->common.queue.count < PS2_QUEUE_SIZE)) {
for(;;) {
/* if not remote, send event. Multiple events are sent if
too big deltas */
@@ -528,6 +530,34 @@ static void ps2_common_reset(PS2State *s)
s->update_irq(s->update_arg, 0);
}
+static void ps2_common_post_load(PS2State *s)
+{
+ PS2Queue *q = &s->queue;
+ int size;
+ int i;
+ int tmp_data[PS2_QUEUE_SIZE];
+
+ /* set the useful data buffer queue size, < PS2_QUEUE_SIZE */
+ size = q->count > PS2_QUEUE_SIZE ? 0 : q->count;
+ for (i = 0; i < size; i++) {
+ /* move the queue elements to the temporary buffer */
+ tmp_data[i] = q->data[q->rptr];
+ if (++q->rptr == 256) {
+ q->rptr = 0;
+ }
+ }
+ /* move the queue elements to the start of data array */
+ if (size > 0) {
+ memcpy(q->data, tmp_data, size);
+ }
+ /* reset rptr/wptr/count */
+ q->rptr = 0;
+ q->wptr = size;
+ q->count = size;
+ s->update_irq(s->update_arg, q->count != 0);
+}
+
static void ps2_kbd_reset(void *opaque)
{
PS2KbdState *s = (PS2KbdState *) opaque;
@@ -600,9 +630,13 @@ static const VMStateDescription
vmstate_ps2_keyboard_ledstate = {
static int ps2_kbd_post_load(void* opaque, int version_id)
{
PS2KbdState *s = (PS2KbdState*)opaque;
-
+ PS2State *ps2 = &s->common;
+
if (version_id == 2)
s->scancode_set=2;
+
+ ps2_common_post_load(ps2);
+
return 0;
}
@@ -629,11 +663,23 @@ static const VMStateDescription vmstate_ps2_keyboard = {
}
};
+static int ps2_mouse_post_load(void *opaque, int version_id)
+{
+ PS2MouseState *s = (PS2MouseState *)opaque;
+ PS2State *ps2 = &s->common;
+
+ ps2_common_post_load(ps2);
+
+ return 0;
+}
+
+
static const VMStateDescription vmstate_ps2_mouse = {
.name = "ps2mouse",
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
+ .post_load = ps2_mouse_post_load,
.fields = (VMStateField []) {
VMSTATE_STRUCT(common, PS2MouseState, 0, vmstate_ps2_common, PS2State),
VMSTATE_UINT8(mouse_status, PS2MouseState),
--
1.6.0.2
- [Qemu-devel] [PATCH] ps2: set ps/2 output buffer size as the same as kernel,
arei.gonglei <=