diff -urp qemu.patch2/hw/vmport.c qemu.patch3/hw/vmport.c
--- qemu.patch2/hw/vmport.c	2008-07-28 14:16:54.000000000 +0200
+++ qemu.patch3/hw/vmport.c	2008-07-28 14:20:12.000000000 +0200
@@ -26,8 +26,17 @@
 #include "pc.h"
 #include "sysemu.h"
 
+#ifdef CONFIG_UUID
+#include <uuid/uuid.h>
+uuid_t vmport_uuid;
+extern char *qemu_uuid;
+#else
+const unsigned char vmport_uuid[16] = { 0 };
+#endif
+
 #define VMPORT_CMD_GETVERSION 0x0a
 #define VMPORT_CMD_GETRAMSIZE 0x14
+#define VMPORT_CMD_GETBIOSUUID 0x13
 
 #define VMPORT_ENTRIES 0x2c
 #define VMPORT_MAGIC   0x564D5868
@@ -93,6 +102,26 @@ static uint32_t vmport_cmd_ram_size(void
     return ram_size;
 }
 
+static inline uint32_t uuid2reg(const unsigned char *uuid, uint32_t idx)
+{
+    int i;
+    uint32_t reg = 0;
+
+    for (i = 0; i < 4; i++)
+        reg |= (uuid[(idx*4) + i] << (i*8));
+
+    return reg;
+}
+
+static uint32_t vmport_cmd_bios_uuid(void *opaque, uint32_t addr)
+{
+    CPUState *env = cpu_single_env;
+    env->regs[R_EBX] = uuid2reg(vmport_uuid, 1);
+    env->regs[R_ECX] = uuid2reg(vmport_uuid, 2);
+    env->regs[R_EDX] = uuid2reg(vmport_uuid, 3);
+    return uuid2reg(vmport_uuid, 0);
+}
+
 void vmport_init(void)
 {
     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
@@ -101,4 +130,14 @@ void vmport_init(void)
     /* Register some generic port commands */
     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
+    vmport_register(VMPORT_CMD_GETBIOSUUID, vmport_cmd_bios_uuid, NULL);
+
+#ifdef CONFIG_UUID
+    if (qemu_uuid != NULL) {
+      if (uuid_parse(qemu_uuid, vmport_uuid) != 0) {
+	/* failed UUID parse; print a warning, but go on */
+	fprintf(stderr, "Failed parsing UUID\n");
+      }
+    }
+#endif
 }