Index: xen-3.3.0-testing/tools/blktap/drivers/tapdisk.h
===================================================================
--- xen-3.3.0-testing.orig/tools/blktap/drivers/tapdisk.h
+++ xen-3.3.0-testing/tools/blktap/drivers/tapdisk.h
@@ -159,16 +159,6 @@ extern struct tap_disk tapdisk_ram;
 extern struct tap_disk tapdisk_qcow;
 extern struct tap_disk tapdisk_qcow2;
 
-#define MAX_DISK_TYPES     20
-
-#define DISK_TYPE_AIO      0
-#define DISK_TYPE_SYNC     1
-#define DISK_TYPE_VMDK     2
-#define DISK_TYPE_RAM      3
-#define DISK_TYPE_QCOW     4
-#define DISK_TYPE_QCOW2    5
-#define DISK_TYPE_IOEMU    6
-
 
 /*Define Individual Disk Parameters here */
 static disk_info_t aio_disk = {
Index: xen-3.3.0-testing/tools/blktap/lib/blktaplib.h
===================================================================
--- xen-3.3.0-testing.orig/tools/blktap/lib/blktaplib.h
+++ xen-3.3.0-testing/tools/blktap/lib/blktaplib.h
@@ -211,6 +211,17 @@ typedef struct msg_pid {
 #define CTLMSG_PID         9
 #define CTLMSG_PID_RSP     10
 
+/* disk driver types */
+#define MAX_DISK_TYPES     20
+
+#define DISK_TYPE_AIO      0
+#define DISK_TYPE_SYNC     1
+#define DISK_TYPE_VMDK     2
+#define DISK_TYPE_RAM      3
+#define DISK_TYPE_QCOW     4
+#define DISK_TYPE_QCOW2    5
+#define DISK_TYPE_IOEMU    6
+
 /* xenstore/xenbus: */
 #define DOMNAME "Domain-0"
 int setup_probe_watch(struct xs_handle *h);
Index: xen-3.3.0-testing/tools/ioemu-remote/hw/xen_blktap.c
===================================================================
--- xen-3.3.0-testing.orig/tools/ioemu-remote/hw/xen_blktap.c
+++ xen-3.3.0-testing/tools/ioemu-remote/hw/xen_blktap.c
@@ -222,9 +222,10 @@ static int map_new_dev(struct td_state *
 	return -1;
 }
 
-static int open_disk(struct td_state *s, char *path, int readonly)
+static int open_disk(struct td_state *s, char *path, int driver, int readonly)
 {
 	BlockDriverState* bs;
+	BlockDriver* drv;
 	char* devname;
 	static int devnumber = 0;
 	int i;
@@ -234,7 +235,22 @@ static int open_disk(struct td_state *s,
 	bs = bdrv_new(devname);
 	free(devname);
 
-	if (bdrv_open(bs, path, 0) != 0) {
+	/* Search for disk driver */
+	for (i = 0; blktap_drivers[i].idnum >= 0; i++) {
+		if (blktap_drivers[i].idnum == driver)
+			break;
+	}
+
+	if (blktap_drivers[i].idnum < 0) {
+		fprintf(stderr, "Could not find image format id %d\n", driver);
+		return -ENOMEM;
+	}
+
+	drv = blktap_drivers[i].drv;
+	DPRINTF("%s driver specified\n", drv ? drv->format_name : "No");
+
+	/* Open the image */
+	if (bdrv_open2(bs, path, 0, drv) != 0) {
 		fprintf(stderr, "Could not open image file %s\n", path);
 		return -ENOMEM;
 	}
@@ -529,7 +545,7 @@ static void handle_blktap_ctrlmsg(void*
 			s = state_init();
 
 			/*Open file*/
-			if (s == NULL || open_disk(s, path, msg->readonly)) {
+			if (s == NULL || open_disk(s, path, msg->drivertype, msg->readonly)) {
 				msglen = sizeof(msg_hdr_t);
 				msg->type = CTLMSG_IMG_FAIL;
 				msg->len = msglen;
Index: xen-3.3.0-testing/tools/ioemu-remote/hw/xen_blktap.h
===================================================================
--- xen-3.3.0-testing.orig/tools/ioemu-remote/hw/xen_blktap.h
+++ xen-3.3.0-testing/tools/ioemu-remote/hw/xen_blktap.h
@@ -50,4 +50,19 @@ typedef struct fd_list_entry {
 	struct fd_list_entry **pprev, *next;
 } fd_list_entry_t;
 
+typedef struct disk_info {
+	int idnum;
+	struct BlockDriver *drv;
+} disk_info_t;
+
+static disk_info_t blktap_drivers[] = {
+	{ DISK_TYPE_AIO, &bdrv_raw },
+	{ DISK_TYPE_SYNC, &bdrv_raw },
+	{ DISK_TYPE_VMDK, &bdrv_vmdk },
+	{ DISK_TYPE_QCOW, &bdrv_qcow },
+	{ DISK_TYPE_QCOW2, &bdrv_qcow2 },
+	{ DISK_TYPE_IOEMU, NULL },
+	{ -1, NULL }
+};
+
 #endif /*XEN_BLKTAP_H_*/