Revert "keyhandler: rework process of nonirq keyhandler"

This reverts commit 610b4eda2c.
It's not useful without ed7e33747d, which got reverted already.

xen/common/keyhandler.c

@@ -75,22 +75,19 @@ static struct keyhandler {
 
 static void keypress_action(unsigned long unused)
 {
-    console_start_log_everything();
-    key_table[keypress_key].fn(keypress_key);
-    console_end_log_everything();
+    handle_keypress(keypress_key, NULL);
 }
 
 static DECLARE_TASKLET(keypress_tasklet, keypress_action, 0);
 
-void handle_keypress(unsigned char key, struct cpu_user_regs *regs,
-                     bool force_tasklet)
+void handle_keypress(unsigned char key, struct cpu_user_regs *regs)
 {
     struct keyhandler *h;
 
     if ( key >= ARRAY_SIZE(key_table) || !(h = &key_table[key])->fn )
         return;
 
-    if ( h->irq_callback || !force_tasklet )
+    if ( !in_irq() || h->irq_callback )
     {
         console_start_log_everything();
         h->irq_callback ? h->irq_fn(key, regs) : h->fn(key);

xen/common/sysctl.c

@@ -136,7 +136,7 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
         {
             if ( copy_from_guest_offset(&c, op->u.debug_keys.keys, i, 1) )
                 goto out;
-            handle_keypress(c, guest_cpu_user_regs(), false);
+            handle_keypress(c, guest_cpu_user_regs());
         }
         ret = 0;
         copyback = 0;

xen/drivers/char/console.c

@@ -347,7 +347,7 @@ static void switch_serial_input(void)
 static void __serial_rx(char c, struct cpu_user_regs *regs)
 {
     if ( xen_rx )
-        return handle_keypress(c, regs, !in_irq());
+        return handle_keypress(c, regs);
 
     /* Deliver input to guest buffer, unless it is already full. */
     if ( (serial_rx_prod-serial_rx_cons) != SERIAL_RX_SIZE )

xen/include/xen/keyhandler.h

@@ -46,8 +46,7 @@ void register_irq_keyhandler(unsigned char key,
                              bool_t diagnostic);
 
 /* Inject a keypress into the key-handling subsystem. */
-extern void handle_keypress(unsigned char key, struct cpu_user_regs *regs,
-                            bool force_tasklet);
+extern void handle_keypress(unsigned char key, struct cpu_user_regs *regs);
 
 /* Scratch space is available for use of any keyhandler. */
 extern char keyhandler_scratch[1024];