FIXED: Re: [Qemu-devel] possible regression in qemu-kvm 0.13.0 (memtest)

diff --git a/hw/pc.c b/hw/pc.c
index 18a4a9f..e63b397 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -411,11 +411,71 @@  void pc_cmos_init(ram_addr_t ram_size,
ram_addr_t above_4g_mem_size,
     qemu_register_reset(pc_cmos_init_late, &arg);
 }

+/* port 92 stuff: could be split off */
+typedef struct Port92State {
+    ISADevice dev;
+    uint8_t outport;
+    qemu_irq *a20_out;
+} Port92State;
+
+static void port92_write(void *opaque, uint32_t addr, uint32_t val)
+{
+    Port92State *s = opaque;
+
+    DPRINTF("port92: write 0x%02x\n", val);
+    s->outport = val;
+    qemu_set_irq(*s->a20_out, (val >> 1) & 1);
+    if (val & 1) {
+        qemu_system_reset_request();
+    }
+}
+
+static uint32_t port92_read(void *opaque, uint32_t addr)
+{
+    Port92State *s = opaque;
+    uint32_t ret;
+
+    ret = s->outport;
+    DPRINTF("port92: read 0x%02x\n", ret);
+    return ret;
+}
+
+static void port92_init(ISADevice *dev, qemu_irq *a20_out)
+{
+    Port92State *s = DO_UPCAST(Port92State, dev, dev);
+
+    s->a20_out = a20_out;
+}
+
+static int port92_initfn(ISADevice *dev)
+{
+    Port92State *s = DO_UPCAST(Port92State, dev, dev);
+
+    register_ioport_read(0x92, 1, 1, port92_read, s);
+    register_ioport_write(0x92, 1, 1, port92_write, s);
+    isa_init_ioport(dev, 0x92);
+    return 0;
+}
+
+static ISADeviceInfo port92_info = {
+    .qdev.name     = "port92",
+    .qdev.size     = sizeof(Port92State),
+    .qdev.no_user  = 1,
+    .init          = port92_initfn,
+};
+
+static void port92_register(void)
+{
+    isa_qdev_register(&port92_info);
+}
+device_init(port92_register)
+
 static void handle_a20_line_change(void *opaque, int irq, int level)
 {
     CPUState *cpu = opaque;

     /* XXX: send to all CPUs ? */
+    /* XXX: add logic to handle multiple A20 line sources */
     cpu_x86_set_a20(cpu, level);
 }

@@ -1027,7 +1087,7 @@  void pc_basic_device_init(qemu_irq *isa_irq,
     PITState *pit;
     qemu_irq rtc_irq = NULL;
     qemu_irq *a20_line;
-    ISADevice *i8042;
+    ISADevice *i8042, *port92;
     qemu_irq *cpu_exit_irq;

     register_ioport_write(0x80, 1, 1, ioport80_write, NULL);
@@ -1061,10 +1121,12 @@  void pc_basic_device_init(qemu_irq *isa_irq,
         }
     }

-    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 1);
+    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 2);
     i8042 = isa_create_simple("i8042");
-    i8042_setup_a20_line(i8042, a20_line);
+    i8042_setup_a20_line(i8042, &a20_line[0]);
     vmmouse_init(i8042);
+    port92 = isa_create_simple("port92");
+    port92_init(port92, &a20_line[1]);

     cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
     DMA_init(0, cpu_exit_irq);
diff --git a/hw/pckbd.c b/hw/pckbd.c
index 863b485..958de0a 100644
--- a/hw/pckbd.c
+++ b/hw/pckbd.c
@@ -211,10 +211,8 @@  static void kbd_queue(KBDState *s, int b, int aux)
         ps2_queue(s->kbd, b);
 }

-static void ioport92_write(void *opaque, uint32_t addr, uint32_t val)
+static void outport_write(KBDState *s, uint32_t addr, uint32_t val)
 {
-    KBDState *s = opaque;
-
     DPRINTF("kbd: write outport=0x%02x\n", val);
     s->outport = val;
     if (s->a20_out) {
@@ -225,16 +223,6 @@  static void ioport92_write(void *opaque, uint32_t
addr, uint32_t val)
     }
 }

-static uint32_t ioport92_read(void *opaque, uint32_t addr)
-{
-    KBDState *s = opaque;
-    uint32_t ret;
-
-    ret = s->outport;
-    DPRINTF("kbd: read outport=0x%02x\n", ret);
-    return ret;
-}
-
 static void kbd_write_command(void *opaque, uint32_t addr, uint32_t val)
 {