diff --git a/Makefile.target b/Makefile.target
index 9e13d99..9643f88 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -205,6 +205,9 @@
 obj-y += rtl8139.o
 obj-y += e1000.o
 
+# Inter-VM PCI shared memory
+obj-$(CONFIG_KVM) += ivshmem.o
+
 # Hardware support
 obj-i386-y += vga.o
 obj-i386-y += mc146818rtc.o i8259.o pc.o
diff --git a/QMP/README b/QMP/README
index 35a80c7..d1430b0 100644
--- a/QMP/README
+++ b/QMP/README
@@ -7,60 +7,85 @@
 The QEMU Monitor Protocol (QMP) allows applications to communicate with
 QEMU's Monitor.
 
-QMP is JSON[1] based and has the following features:
+QMP is JSON[1] based and currently has the following features:
 
 - Lightweight, text-based, easy to parse data format
-- Asynchronous events support 
-- Stability
+- Asynchronous messages support (ie. events)
+- Capabilities Negotiation
 
-For more information, please, refer to the following files:
+For detailed information on QMP's usage, please, refer to the following files:
 
 o qmp-spec.txt      QEMU Monitor Protocol current specification
-o qmp-commands.txt  QMP supported commands
+o qmp-commands.txt  QMP supported commands (auto-generated at build-time)
 o qmp-events.txt    List of available asynchronous events
 
 There are also two simple Python scripts available:
 
-o qmp-shell       A shell
-o vm-info         Show some information about the Virtual Machine
+o qmp-shell  A shell
+o vm-info    Show some information about the Virtual Machine
+
+IMPORTANT: It's strongly recommended to read the 'Stability Considerations'
+section in the qmp-commands.txt file before making any serious use of QMP.
+
 
 [1] http://www.json.org
 
 Usage
 -----
 
-To enable QMP, QEMU has to be started in "control mode". There are
-two ways of doing this, the simplest one is using the the '-qmp'
-command-line option.
+To enable QMP, you need a QEMU monitor instance in "control mode". There are
+two ways of doing this.
 
-For example:
+The simplest one is using the '-qmp' command-line option. The following
+example makes QMP available on localhost port 4444:
 
-$ qemu [...] -qmp tcp:localhost:4444,server
+  $ qemu [...] -qmp tcp:localhost:4444,server
 
-Will start QEMU in control mode, waiting for a client TCP connection
-on localhost port 4444.
+However, in order to have more complex combinations, like multiple monitors,
+the '-mon' command-line option should be used along with the '-chardev' one.
+For instance, the following example creates one user monitor on stdio and one
+QMP monitor on localhost port 4444.
 
-It is also possible to use the '-mon' command-line option to have
-more complex combinations. Please, refer to the QEMU's manpage for
-more information.
+   $ qemu [...] -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline \
+                -chardev socket,id=mon1,host=localhost,port=4444,server \
+                -mon chardev=mon1,mode=control
+
+Please, refer to QEMU's manpage for more information.
 
 Simple Testing
 --------------
 
-To manually test QMP one can connect with telnet and issue commands:
+To manually test QMP one can connect with telnet and issue commands by hand:
 
 $ telnet localhost 4444
 Trying 127.0.0.1...
 Connected to localhost.
 Escape character is '^]'.
-{"QMP": {"version": {"qemu": "0.12.50", "package": ""}, "capabilities": []}}
+{"QMP": {"version": {"qemu": {"micro": 50, "minor": 13, "major": 0}, "package": ""}, "capabilities": []}}
 { "execute": "qmp_capabilities" }
 {"return": {}}
 { "execute": "query-version" }
-{"return": {"qemu": "0.12.50", "package": ""}}
+{"return": {"qemu": {"micro": 50, "minor": 13, "major": 0}, "package": ""}}
 
-Contact
--------
+Development Process
+-------------------
 
-http://www.linux-kvm.org/page/MonitorProtocol
-Luiz Fernando N. Capitulino <lcapitulino@redhat.com>
+When changing QMP's interface (by adding new commands, events or modifying
+existing ones) it's mandatory to update the relevant documentation, which is
+one (or more) of the files listed in the 'Introduction' section*.
+
+Also, it's strongly recommended to send the documentation patch first, before
+doing any code change. This is so because:
+
+  1. Avoids the code dictating the interface
+
+  2. Review can improve your interface.  Letting that happen before
+     you implement it can save you work.
+
+* The qmp-commands.txt file is generated from the qemu-monitor.hx one, which
+  is the file that should be edited.
+
+Homepage
+--------
+
+http://wiki.qemu.org/QMP
diff --git a/VERSION b/VERSION
index 0eb2884..73b08a1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.12.91
+0.12.93
diff --git a/arch_init.c b/arch_init.c
index 47bb4b2..e0bd18c 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -104,10 +104,11 @@
     return 1;
 }
 
+static RAMBlock *last_block;
+static ram_addr_t last_offset;
+
 static int ram_save_block(QEMUFile *f)
 {
-    static RAMBlock *last_block = NULL;
-    static ram_addr_t last_offset = 0;
     RAMBlock *block = last_block;
     ram_addr_t offset = last_offset;
     ram_addr_t current_addr;
@@ -231,6 +232,8 @@
     if (stage == 1) {
         RAMBlock *block;
         bytes_transferred = 0;
+        last_block = NULL;
+        last_offset = 0;
 
         /* Make sure all dirty bits are set */
         QLIST_FOREACH(block, &ram_list.blocks, next) {
diff --git a/block.c b/block.c
index e6087f3..85c8d3e 100644
--- a/block.c
+++ b/block.c
@@ -523,7 +523,6 @@
               BlockDriver *drv)
 {
     int ret;
-    int probed = 0;
 
     if (flags & BDRV_O_SNAPSHOT) {
         BlockDriverState *bs1;
@@ -584,7 +583,6 @@
     /* Find the right image format driver */
     if (!drv) {
         ret = find_image_format(filename, &drv);
-        probed = 1;
     }
 
     if (!drv) {
@@ -597,8 +595,6 @@
         goto unlink_and_fail;
     }
 
-    bs->probed = probed;
-
     /* If there is a backing file, use it */
     if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
         char backing_filename[PATH_MAX];
diff --git a/block.h b/block.h
index db131a3..5f64380 100644
--- a/block.h
+++ b/block.h
@@ -35,7 +35,7 @@
 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
 
-#define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB)
+#define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
 
 #define BDRV_SECTOR_BITS   9
 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 166922f..f562b16 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -655,7 +655,7 @@
     int ret;
 
     BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE);
-    ret = bdrv_pwrite_sync(bs->file, l2_offset + start_offset,
+    ret = bdrv_pwrite(bs->file, l2_offset + start_offset,
         &l2_table[l2_start_index], len);
     if (ret < 0) {
         return ret;
@@ -718,9 +718,17 @@
         goto err;
     }
 
-    for (i = 0; i < j; i++)
-        qcow2_free_any_clusters(bs,
-            be64_to_cpu(old_cluster[i]) & ~QCOW_OFLAG_COPIED, 1);
+    /*
+     * If this was a COW, we need to decrease the refcount of the old cluster.
+     * Also flush bs->file to get the right order for L2 and refcount update.
+     */
+    if (j != 0) {
+        bdrv_flush(bs->file);
+        for (i = 0; i < j; i++) {
+            qcow2_free_any_clusters(bs,
+                be64_to_cpu(old_cluster[i]) & ~QCOW_OFLAG_COPIED, 1);
+        }
+    }
 
     ret = 0;
 err:
diff --git a/block/raw-posix.c b/block/raw-posix.c
index af47e82..1c49666 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1156,9 +1156,6 @@
     int fd, ret;
     int prio = 0;
 
-    if (strstart(filename, "/dev/cd", NULL))
-        prio = 50;
-
     fd = open(filename, O_RDONLY | O_NONBLOCK);
     if (fd < 0) {
         goto out;
diff --git a/block/raw.c b/block/raw.c
index 61e6748..9108779 100644
--- a/block/raw.c
+++ b/block/raw.c
@@ -9,82 +9,15 @@
     return 0;
 }
 
-/* check for the user attempting to write something that looks like a
-   block format header to the beginning of the image and fail out.
-*/
-static int check_for_block_signature(BlockDriverState *bs, const uint8_t *buf)
-{
-    static const uint8_t signatures[][4] = {
-        { 'Q', 'F', 'I', 0xfb }, /* qcow/qcow2 */
-        { 'C', 'O', 'W', 'D' }, /* VMDK3 */
-        { 'V', 'M', 'D', 'K' }, /* VMDK4 */
-        { 'O', 'O', 'O', 'M' }, /* UML COW */
-        {}
-    };
-    int i;
-
-    for (i = 0; signatures[i][0] != 0; i++) {
-        if (memcmp(buf, signatures[i], 4) == 0) {
-            return 1;
-        }
-    }
-
-    return 0;
-}
-
-static int check_write_unsafe(BlockDriverState *bs, int64_t sector_num,
-                              const uint8_t *buf, int nb_sectors)
-{
-    /* assume that if the user specifies the format explicitly, then assume
-       that they will continue to do so and provide no safety net */
-    if (!bs->probed) {
-        return 0;
-    }
-
-    if (sector_num == 0 && nb_sectors > 0) {
-        return check_for_block_signature(bs, buf);
-    }
-
-    return 0;
-}
-
 static int raw_read(BlockDriverState *bs, int64_t sector_num,
                     uint8_t *buf, int nb_sectors)
 {
     return bdrv_read(bs->file, sector_num, buf, nb_sectors);
 }
 
-static int raw_write_scrubbed_bootsect(BlockDriverState *bs,
-                                       const uint8_t *buf)
-{
-    uint8_t bootsect[512];
-
-    /* scrub the dangerous signature */
-    memcpy(bootsect, buf, 512);
-    memset(bootsect, 0, 4);
-
-    return bdrv_write(bs->file, 0, bootsect, 1);
-}
-
 static int raw_write(BlockDriverState *bs, int64_t sector_num,
                      const uint8_t *buf, int nb_sectors)
 {
-    if (check_write_unsafe(bs, sector_num, buf, nb_sectors)) {
-        int ret;
-
-        ret = raw_write_scrubbed_bootsect(bs, buf);
-        if (ret < 0) {
-            return ret;
-        }
-
-        ret = bdrv_write(bs->file, 1, buf + 512, nb_sectors - 1);
-        if (ret < 0) {
-            return ret;
-        }
-
-        return ret + 512;
-    }
-
     return bdrv_write(bs->file, sector_num, buf, nb_sectors);
 }
 
@@ -95,73 +28,10 @@
     return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
 }
 
-typedef struct RawScrubberBounce
-{
-    BlockDriverCompletionFunc *cb;
-    void *opaque;
-    QEMUIOVector qiov;
-} RawScrubberBounce;
-
-static void raw_aio_writev_scrubbed(void *opaque, int ret)
-{
-    RawScrubberBounce *b = opaque;
-
-    if (ret < 0) {
-        b->cb(b->opaque, ret);
-    } else {
-        b->cb(b->opaque, ret + 512);
-    }
-
-    qemu_iovec_destroy(&b->qiov);
-    qemu_free(b);
-}
-
 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
     int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
     BlockDriverCompletionFunc *cb, void *opaque)
 {
-    const uint8_t *first_buf;
-    int first_buf_index = 0, i;
-
-    /* This is probably being paranoid, but handle cases of zero size
-       vectors. */
-    for (i = 0; i < qiov->niov; i++) {
-        if (qiov->iov[i].iov_len) {
-            assert(qiov->iov[i].iov_len >= 512);
-            first_buf_index = i;
-            break;
-        }
-    }
-
-    first_buf = qiov->iov[first_buf_index].iov_base;
-
-    if (check_write_unsafe(bs, sector_num, first_buf, nb_sectors)) {
-        RawScrubberBounce *b;
-        int ret;
-
-        /* write the first sector using sync I/O */
-        ret = raw_write_scrubbed_bootsect(bs, first_buf);
-        if (ret < 0) {
-            return NULL;
-        }
-
-        /* adjust request to be everything but first sector */
-
-        b = qemu_malloc(sizeof(*b));
-        b->cb = cb;
-        b->opaque = opaque;
-
-        qemu_iovec_init(&b->qiov, qiov->nalloc);
-        qemu_iovec_concat(&b->qiov, qiov, qiov->size);
-
-        b->qiov.size -= 512;
-        b->qiov.iov[first_buf_index].iov_base += 512;
-        b->qiov.iov[first_buf_index].iov_len -= 512;
-
-        return bdrv_aio_writev(bs->file, sector_num + 1, &b->qiov,
-                               nb_sectors - 1, raw_aio_writev_scrubbed, b);
-    }
-
     return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
 }
 
diff --git a/block/vvfat.c b/block/vvfat.c
index 365332a..53e57bf 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2665,6 +2665,11 @@
 
 DLOG(checkpoint());
 
+    /* Check if we're operating in read-only mode */
+    if (s->qcow == NULL) {
+        return -EACCES;
+    }
+
     vvfat_close_current_file(s);
 
     /*
@@ -2763,12 +2768,12 @@
 
 static int write_target_commit(BlockDriverState *bs, int64_t sector_num,
 	const uint8_t* buffer, int nb_sectors) {
-    BDRVVVFATState* s = bs->opaque;
+    BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
     return try_commit(s);
 }
 
 static void write_target_close(BlockDriverState *bs) {
-    BDRVVVFATState* s = bs->opaque;
+    BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
     bdrv_delete(s->qcow);
     free(s->qcow_filename);
 }
@@ -2783,6 +2788,7 @@
 {
     BlockDriver *bdrv_qcow;
     QEMUOptionParameter *options;
+    int ret;
     int size = sector2cluster(s, s->sector_count);
     s->used_clusters = calloc(size, 1);
 
@@ -2798,11 +2804,16 @@
 
     if (bdrv_create(bdrv_qcow, s->qcow_filename, options) < 0)
 	return -1;
+
     s->qcow = bdrv_new("");
-    if (s->qcow == NULL ||
-        bdrv_open(s->qcow, s->qcow_filename, BDRV_O_RDWR, bdrv_qcow) < 0)
-    {
-	return -1;
+    if (s->qcow == NULL) {
+        return -1;
+    }
+
+    ret = bdrv_open(s->qcow, s->qcow_filename,
+            BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, bdrv_qcow);
+    if (ret < 0) {
+	return ret;
     }
 
 #ifndef _WIN32
@@ -2811,7 +2822,8 @@
 
     s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1);
     s->bs->backing_hd->drv = &vvfat_write_target;
-    s->bs->backing_hd->opaque = s;
+    s->bs->backing_hd->opaque = qemu_malloc(sizeof(void*));
+    *(void**)s->bs->backing_hd->opaque = s;
 
     return 0;
 }
diff --git a/block_int.h b/block_int.h
index b863451..e8e7156 100644
--- a/block_int.h
+++ b/block_int.h
@@ -148,7 +148,6 @@
     int encrypted; /* if true, the media is encrypted */
     int valid_key; /* if true, a valid encryption key has been set */
     int sg;        /* if true, the device is a /dev/sg* */
-    int probed;    /* if true, format was probed automatically */
     /* event callback when inserting/removing */
     void (*change_cb)(void *opaque);
     void *change_opaque;
diff --git a/buffered_file.c b/buffered_file.c
index 54dc6c2..1836e7e 100644
--- a/buffered_file.c
+++ b/buffered_file.c
@@ -156,6 +156,14 @@
         offset = size;
     }
 
+    if (pos == 0 && size == 0) {
+        DPRINTF("file is ready\n");
+        if (s->bytes_xfer <= s->xfer_limit) {
+            DPRINTF("notifying client\n");
+            s->put_ready(s->opaque);
+        }
+    }
+
     return offset;
 }
 
@@ -222,8 +230,10 @@
 {
     QEMUFileBuffered *s = opaque;
 
-    if (s->has_error)
+    if (s->has_error) {
+        buffered_close(s);
         return;
+    }
 
     qemu_mod_timer(s->timer, qemu_get_clock(rt_clock) + 100);
 
diff --git a/docs/specs/ivshmem_device_spec.txt b/docs/specs/ivshmem_device_spec.txt
new file mode 100644
index 0000000..23dd2ba
--- /dev/null
+++ b/docs/specs/ivshmem_device_spec.txt
@@ -0,0 +1,96 @@
+
+Device Specification for Inter-VM shared memory device
+------------------------------------------------------
+
+The Inter-VM shared memory device is designed to share a region of memory to
+userspace in multiple virtual guests.  The memory region does not belong to any
+guest, but is a POSIX memory object on the host.  Optionally, the device may
+support sending interrupts to other guests sharing the same memory region.
+
+
+The Inter-VM PCI device
+-----------------------
+
+*BARs*
+
+The device supports three BARs.  BAR0 is a 1 Kbyte MMIO region to support
+registers.  BAR1 is used for MSI-X when it is enabled in the device.  BAR2 is
+used to map the shared memory object from the host.  The size of BAR2 is
+specified when the guest is started and must be a power of 2 in size.
+
+*Registers*
+
+The device currently supports 4 registers of 32-bits each.  Registers
+are used for synchronization between guests sharing the same memory object when
+interrupts are supported (this requires using the shared memory server).
+
+The server assigns each VM an ID number and sends this ID number to the Qemu
+process when the guest starts.
+
+enum ivshmem_registers {
+    IntrMask = 0,
+    IntrStatus = 4,
+    IVPosition = 8,
+    Doorbell = 12
+};
+
+The first two registers are the interrupt mask and status registers.  Mask and
+status are only used with pin-based interrupts.  They are unused with MSI
+interrupts.
+
+Status Register: The status register is set to 1 when an interrupt occurs.
+
+Mask Register: The mask register is bitwise ANDed with the interrupt status
+and the result will raise an interrupt if it is non-zero.  However, since 1 is
+the only value the status will be set to, it is only the first bit of the mask
+that has any effect.  Therefore interrupts can be masked by setting the first
+bit to 0 and unmasked by setting the first bit to 1.
+
+IVPosition Register: The IVPosition register is read-only and reports the
+guest's ID number.  The guest IDs are non-negative integers.  When using the
+server, since the server is a separate process, the VM ID will only be set when
+the device is ready (shared memory is received from the server and accessible via
+the device).  If the device is not ready, the IVPosition will return -1.
+Applications should ensure that they have a valid VM ID before accessing the
+shared memory.
+
+Doorbell Register:  To interrupt another guest, a guest must write to the
+Doorbell register.  The doorbell register is 32-bits, logically divided into
+two 16-bit fields.  The high 16-bits are the guest ID to interrupt and the low
+16-bits are the interrupt vector to trigger.  The semantics of the value
+written to the doorbell depends on whether the device is using MSI or a regular
+pin-based interrupt.  In short, MSI uses vectors while regular interrupts set the
+status register.
+
+Regular Interrupts
+
+If regular interrupts are used (due to either a guest not supporting MSI or the
+user specifying not to use them on startup) then the value written to the lower
+16-bits of the Doorbell register results is arbitrary and will trigger an
+interrupt in the destination guest.
+
+Message Signalled Interrupts
+
+A ivshmem device may support multiple MSI vectors.  If so, the lower 16-bits
+written to the Doorbell register must be between 0 and the maximum number of
+vectors the guest supports.  The lower 16 bits written to the doorbell is the
+MSI vector that will be raised in the destination guest.  The number of MSI
+vectors is configurable but it is set when the VM is started.
+
+The important thing to remember with MSI is that it is only a signal, no status
+is set (since MSI interrupts are not shared).  All information other than the
+interrupt itself should be communicated via the shared memory region.  Devices
+supporting multiple MSI vectors can use different vectors to indicate different
+events have occurred.  The semantics of interrupt vectors are left to the
+user's discretion.
+
+
+Usage in the Guest
+------------------
+
+The shared memory device is intended to be used with the provided UIO driver.
+Very little configuration is needed.  The guest should map BAR0 to access the
+registers (an array of 32-bit ints allows simple writing) and map BAR2 to
+access the shared memory region itself.  The size of the shared memory region
+is specified when the guest (or shared memory server) is started.  A guest may
+map the whole shared memory region or only part of it.
diff --git a/hw/escc.c b/hw/escc.c
index 6d2fd36..8714239 100644
--- a/hw/escc.c
+++ b/hw/escc.c
@@ -65,6 +65,8 @@
  *  2006-Aug-10  Igor Kovalenko :   Renamed KBDQueue to SERIOQueue, implemented
  *                                  serial mouse queue.
  *                                  Implemented serial mouse protocol.
+ *
+ *  2010-May-23  Artyom Tarasenko:  Reworked IUS logic
  */
 
 #ifdef DEBUG_SERIAL
@@ -279,7 +281,7 @@
 
 static int escc_update_irq_chn(ChannelState *s)
 {
-    if ((((s->wregs[W_INTR] & INTR_TXINT) && s->txint == 1) ||
+    if ((((s->wregs[W_INTR] & INTR_TXINT) && (s->txint == 1)) ||
          // tx ints enabled, pending
          ((((s->wregs[W_INTR] & INTR_RXMODEMSK) == INTR_RXINT1ST) ||
            ((s->wregs[W_INTR] & INTR_RXMODEMSK) == INTR_RXINTALL)) &&
@@ -342,24 +344,22 @@
 static inline void set_rxint(ChannelState *s)
 {
     s->rxint = 1;
-    if (!s->txint_under_svc) {
-        s->rxint_under_svc = 1;
-        if (s->chn == chn_a) {
-            if (s->wregs[W_MINTR] & MINTR_STATUSHI)
-                s->otherchn->rregs[R_IVEC] = IVEC_HIRXINTA;
-            else
-                s->otherchn->rregs[R_IVEC] = IVEC_LORXINTA;
-        } else {
-            if (s->wregs[W_MINTR] & MINTR_STATUSHI)
-                s->rregs[R_IVEC] = IVEC_HIRXINTB;
-            else
-                s->rregs[R_IVEC] = IVEC_LORXINTB;
-        }
-    }
-    if (s->chn == chn_a)
+    /* XXX: missing daisy chainnig: chn_b rx should have a lower priority
+       than chn_a rx/tx/special_condition service*/
+    s->rxint_under_svc = 1;
+    if (s->chn == chn_a) {
         s->rregs[R_INTR] |= INTR_RXINTA;
-    else
+        if (s->wregs[W_MINTR] & MINTR_STATUSHI)
+            s->otherchn->rregs[R_IVEC] = IVEC_HIRXINTA;
+        else
+            s->otherchn->rregs[R_IVEC] = IVEC_LORXINTA;
+    } else {
         s->otherchn->rregs[R_INTR] |= INTR_RXINTB;
+        if (s->wregs[W_MINTR] & MINTR_STATUSHI)
+            s->rregs[R_IVEC] = IVEC_HIRXINTB;
+        else
+            s->rregs[R_IVEC] = IVEC_LORXINTB;
+    }
     escc_update_irq(s);
 }
 
@@ -369,19 +369,17 @@
     if (!s->rxint_under_svc) {
         s->txint_under_svc = 1;
         if (s->chn == chn_a) {
+            s->rregs[R_INTR] |= INTR_TXINTA;
             if (s->wregs[W_MINTR] & MINTR_STATUSHI)
                 s->otherchn->rregs[R_IVEC] = IVEC_HITXINTA;
             else
                 s->otherchn->rregs[R_IVEC] = IVEC_LOTXINTA;
         } else {
             s->rregs[R_IVEC] = IVEC_TXINTB;
+            s->otherchn->rregs[R_INTR] |= INTR_TXINTB;
         }
-    }
-    if (s->chn == chn_a)
-        s->rregs[R_INTR] |= INTR_TXINTA;
-    else
-        s->otherchn->rregs[R_INTR] |= INTR_TXINTB;
     escc_update_irq(s);
+    }
 }
 
 static inline void clr_rxint(ChannelState *s)
@@ -417,6 +415,7 @@
             s->otherchn->rregs[R_IVEC] = IVEC_LONOINT;
         s->rregs[R_INTR] &= ~INTR_TXINTA;
     } else {
+        s->otherchn->rregs[R_INTR] &= ~INTR_TXINTB;
         if (s->wregs[W_MINTR] & MINTR_STATUSHI)
             s->rregs[R_IVEC] = IVEC_HINOINT;
         else
@@ -515,10 +514,15 @@
                 clr_txint(s);
                 break;
             case CMD_CLR_IUS:
-                if (s->rxint_under_svc)
-                    clr_rxint(s);
-                else if (s->txint_under_svc)
-                    clr_txint(s);
+                if (s->rxint_under_svc) {
+                    s->rxint_under_svc = 0;
+                    if (s->txint) {
+                        set_txint(s);
+                    }
+                } else if (s->txint_under_svc) {
+                    s->txint_under_svc = 0;
+                }
+                escc_update_irq(s);
                 break;
             default:
                 break;
diff --git a/hw/hw.h b/hw/hw.h
index ec6985d..44d1a3c 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -264,6 +264,8 @@
                          void *opaque);
 
 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque);
+void register_device_unmigratable(DeviceState *dev, const char *idstr,
+                                                                void *opaque);
 
 typedef void QEMUResetHandler(void *opaque);
 
diff --git a/hw/ivshmem.c b/hw/ivshmem.c
new file mode 100644
index 0000000..06dce70
--- /dev/null
+++ b/hw/ivshmem.c
@@ -0,0 +1,829 @@
+/*
+ * Inter-VM Shared Memory PCI device.
+ *
+ * Author:
+ *      Cam Macdonell <cam@cs.ualberta.ca>
+ *
+ * Based On: cirrus_vga.c
+ *          Copyright (c) 2004 Fabrice Bellard
+ *          Copyright (c) 2004 Makoto Suzuki (suzu)
+ *
+ *      and rtl8139.c
+ *          Copyright (c) 2006 Igor Kovalenko
+ *
+ * This code is licensed under the GNU GPL v2.
+ */
+#include "hw.h"
+#include "pc.h"
+#include "pci.h"
+#include "msix.h"
+#include "kvm.h"
+
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#define IVSHMEM_IOEVENTFD   0
+#define IVSHMEM_MSI     1
+
+#define IVSHMEM_PEER    0
+#define IVSHMEM_MASTER  1
+
+#define IVSHMEM_REG_BAR_SIZE 0x100
+
+//#define DEBUG_IVSHMEM
+#ifdef DEBUG_IVSHMEM
+#define IVSHMEM_DPRINTF(fmt, ...)        \
+    do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define IVSHMEM_DPRINTF(fmt, ...)
+#endif
+
+typedef struct Peer {
+    int nb_eventfds;
+    int *eventfds;
+} Peer;
+
+typedef struct EventfdEntry {
+    PCIDevice *pdev;
+    int vector;
+} EventfdEntry;
+
+typedef struct IVShmemState {
+    PCIDevice dev;
+    uint32_t intrmask;
+    uint32_t intrstatus;
+    uint32_t doorbell;
+
+    CharDriverState **eventfd_chr;
+    CharDriverState *server_chr;
+    int ivshmem_mmio_io_addr;
+
+    pcibus_t mmio_addr;
+    pcibus_t shm_pci_addr;
+    uint64_t ivshmem_offset;
+    uint64_t ivshmem_size; /* size of shared memory region */
+    int shm_fd; /* shared memory file descriptor */
+
+    Peer *peers;
+    int nb_peers; /* how many guests we have space for */
+    int max_peer; /* maximum numbered peer */
+
+    int vm_id;
+    uint32_t vectors;
+    uint32_t features;
+    EventfdEntry *eventfd_table;
+
+    char * shmobj;
+    char * sizearg;
+    char * role;
+    int role_val;   /* scalar to avoid multiple string comparisons */
+} IVShmemState;
+
+/* registers for the Inter-VM shared memory device */
+enum ivshmem_registers {
+    INTRMASK = 0,
+    INTRSTATUS = 4,
+    IVPOSITION = 8,
+    DOORBELL = 12,
+};
+
+static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
+                                                    unsigned int feature) {
+    return (ivs->features & (1 << feature));
+}
+
+static inline bool is_power_of_two(uint64_t x) {
+    return (x & (x - 1)) == 0;
+}
+
+static void ivshmem_map(PCIDevice *pci_dev, int region_num,
+                    pcibus_t addr, pcibus_t size, int type)
+{
+    IVShmemState *s = DO_UPCAST(IVShmemState, dev, pci_dev);
+
+    s->shm_pci_addr = addr;
+
+    if (s->ivshmem_offset > 0) {
+        cpu_register_physical_memory(s->shm_pci_addr, s->ivshmem_size,
+                                                            s->ivshmem_offset);
+    }
+
+    IVSHMEM_DPRINTF("guest pci addr = %" FMT_PCIBUS ", guest h/w addr = %"
+        PRIu64 ", size = %" FMT_PCIBUS "\n", addr, s->ivshmem_offset, size);
+
+}
+
+/* accessing registers - based on rtl8139 */
+static void ivshmem_update_irq(IVShmemState *s, int val)
+{
+    int isr;
+    isr = (s->intrstatus & s->intrmask) & 0xffffffff;
+
+    /* don't print ISR resets */
+    if (isr) {
+        IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
+           isr ? 1 : 0, s->intrstatus, s->intrmask);
+    }
+
+    qemu_set_irq(s->dev.irq[0], (isr != 0));
+}
+
+static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
+{
+    IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
+
+    s->intrmask = val;
+
+    ivshmem_update_irq(s, val);
+}
+
+static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
+{
+    uint32_t ret = s->intrmask;
+
+    IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
+
+    return ret;
+}
+
+static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
+{
+    IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
+
+    s->intrstatus = val;
+
+    ivshmem_update_irq(s, val);
+    return;
+}
+
+static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
+{
+    uint32_t ret = s->intrstatus;
+
+    /* reading ISR clears all interrupts */
+    s->intrstatus = 0;
+
+    ivshmem_update_irq(s, 0);
+
+    return ret;
+}
+
+static void ivshmem_io_writew(void *opaque, target_phys_addr_t addr,
+                                                            uint32_t val)
+{
+
+    IVSHMEM_DPRINTF("We shouldn't be writing words\n");
+}
+
+static void ivshmem_io_writel(void *opaque, target_phys_addr_t addr,
+                                                            uint32_t val)
+{
+    IVShmemState *s = opaque;
+
+    uint64_t write_one = 1;
+    uint16_t dest = val >> 16;
+    uint16_t vector = val & 0xff;
+
+    addr &= 0xfc;
+
+    IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr);
+    switch (addr)
+    {
+        case INTRMASK:
+            ivshmem_IntrMask_write(s, val);
+            break;
+
+        case INTRSTATUS:
+            ivshmem_IntrStatus_write(s, val);
+            break;
+
+        case DOORBELL:
+            /* check that dest VM ID is reasonable */
+            if (dest > s->max_peer) {
+                IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
+                break;
+            }
+
+            /* check doorbell range */
+            if (vector < s->peers[dest].nb_eventfds) {
+                IVSHMEM_DPRINTF("Writing %" PRId64 " to VM %d on vector %d\n",
+                                                    write_one, dest, vector);
+                if (write(s->peers[dest].eventfds[vector],
+                                                    &(write_one), 8) != 8) {
+                    IVSHMEM_DPRINTF("error writing to eventfd\n");
+                }
+            }
+            break;
+        default:
+            IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
+    }
+}
+
+static void ivshmem_io_writeb(void *opaque, target_phys_addr_t addr,
+                                                                uint32_t val)
+{
+    IVSHMEM_DPRINTF("We shouldn't be writing bytes\n");
+}
+
+static uint32_t ivshmem_io_readw(void *opaque, target_phys_addr_t addr)
+{
+
+    IVSHMEM_DPRINTF("We shouldn't be reading words\n");
+    return 0;
+}
+
+static uint32_t ivshmem_io_readl(void *opaque, target_phys_addr_t addr)
+{
+
+    IVShmemState *s = opaque;
+    uint32_t ret;
+
+    switch (addr)
+    {
+        case INTRMASK:
+            ret = ivshmem_IntrMask_read(s);
+            break;
+
+        case INTRSTATUS:
+            ret = ivshmem_IntrStatus_read(s);
+            break;
+
+        case IVPOSITION:
+            /* return my VM ID if the memory is mapped */
+            if (s->shm_fd > 0) {
+                ret = s->vm_id;
+            } else {
+                ret = -1;
+            }
+            break;
+
+        default:
+            IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
+            ret = 0;
+    }
+
+    return ret;
+}
+
+static uint32_t ivshmem_io_readb(void *opaque, target_phys_addr_t addr)
+{
+    IVSHMEM_DPRINTF("We shouldn't be reading bytes\n");
+
+    return 0;
+}
+
+static CPUReadMemoryFunc * const ivshmem_mmio_read[3] = {
+    ivshmem_io_readb,
+    ivshmem_io_readw,
+    ivshmem_io_readl,
+};
+
+static CPUWriteMemoryFunc * const ivshmem_mmio_write[3] = {
+    ivshmem_io_writeb,
+    ivshmem_io_writew,
+    ivshmem_io_writel,
+};
+
+static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
+{
+    IVShmemState *s = opaque;
+
+    ivshmem_IntrStatus_write(s, *buf);
+
+    IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
+}
+
+static int ivshmem_can_receive(void * opaque)
+{
+    return 8;
+}
+
+static void ivshmem_event(void *opaque, int event)
+{
+    IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
+}
+
+static void fake_irqfd(void *opaque, const uint8_t *buf, int size) {
+
+    EventfdEntry *entry = opaque;
+    PCIDevice *pdev = entry->pdev;
+
+    IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
+    msix_notify(pdev, entry->vector);
+}
+
+static CharDriverState* create_eventfd_chr_device(void * opaque, int eventfd,
+                                                                    int vector)
+{
+    /* create a event character device based on the passed eventfd */
+    IVShmemState *s = opaque;
+    CharDriverState * chr;
+
+    chr = qemu_chr_open_eventfd(eventfd);
+
+    if (chr == NULL) {
+        fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
+        exit(-1);
+    }
+
+    /* if MSI is supported we need multiple interrupts */
+    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+        s->eventfd_table[vector].pdev = &s->dev;
+        s->eventfd_table[vector].vector = vector;
+
+        qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
+                      ivshmem_event, &s->eventfd_table[vector]);
+    } else {
+        qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
+                      ivshmem_event, s);
+    }
+
+    return chr;
+
+}
+
+static int check_shm_size(IVShmemState *s, int fd) {
+    /* check that the guest isn't going to try and map more memory than the
+     * the object has allocated return -1 to indicate error */
+
+    struct stat buf;
+
+    fstat(fd, &buf);
+
+    if (s->ivshmem_size > buf.st_size) {
+        fprintf(stderr,
+                "IVSHMEM ERROR: Requested memory size greater"
+                " than shared object size (%" PRIu64 " > %" PRIu64")\n",
+                s->ivshmem_size, (uint64_t)buf.st_size);
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+/* create the shared memory BAR when we are not using the server, so we can
+ * create the BAR and map the memory immediately */
+static void create_shared_memory_BAR(IVShmemState *s, int fd) {
+
+    void * ptr;
+
+    s->shm_fd = fd;
+
+    ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+
+    s->ivshmem_offset = qemu_ram_alloc_from_ptr(&s->dev.qdev, "ivshmem.bar2",
+                                                        s->ivshmem_size, ptr);
+
+    /* region for shared memory */
+    pci_register_bar(&s->dev, 2, s->ivshmem_size,
+                                PCI_BASE_ADDRESS_SPACE_MEMORY, ivshmem_map);
+}
+
+static void close_guest_eventfds(IVShmemState *s, int posn)
+{
+    int i, guest_curr_max;
+
+    guest_curr_max = s->peers[posn].nb_eventfds;
+
+    for (i = 0; i < guest_curr_max; i++) {
+        kvm_set_ioeventfd_mmio_long(s->peers[posn].eventfds[i],
+                    s->mmio_addr + DOORBELL, (posn << 16) | i, 0);
+        close(s->peers[posn].eventfds[i]);
+    }
+
+    qemu_free(s->peers[posn].eventfds);
+    s->peers[posn].nb_eventfds = 0;
+}
+
+static void setup_ioeventfds(IVShmemState *s) {
+
+    int i, j;
+
+    for (i = 0; i <= s->max_peer; i++) {
+        for (j = 0; j < s->peers[i].nb_eventfds; j++) {
+            kvm_set_ioeventfd_mmio_long(s->peers[i].eventfds[j],
+                    s->mmio_addr + DOORBELL, (i << 16) | j, 1);
+        }
+    }
+}
+
+/* this function increase the dynamic storage need to store data about other
+ * guests */
+static void increase_dynamic_storage(IVShmemState *s, int new_min_size) {
+
+    int j, old_nb_alloc;
+
+    old_nb_alloc = s->nb_peers;
+
+    while (new_min_size >= s->nb_peers)
+        s->nb_peers = s->nb_peers * 2;
+
+    IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
+    s->peers = qemu_realloc(s->peers, s->nb_peers * sizeof(Peer));
+
+    /* zero out new pointers */
+    for (j = old_nb_alloc; j < s->nb_peers; j++) {
+        s->peers[j].eventfds = NULL;
+        s->peers[j].nb_eventfds = 0;
+    }
+}
+
+static void ivshmem_read(void *opaque, const uint8_t * buf, int flags)
+{
+    IVShmemState *s = opaque;
+    int incoming_fd, tmp_fd;
+    int guest_max_eventfd;
+    long incoming_posn;
+
+    memcpy(&incoming_posn, buf, sizeof(long));
+    /* pick off s->server_chr->msgfd and store it, posn should accompany msg */
+    tmp_fd = qemu_chr_get_msgfd(s->server_chr);
+    IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
+
+    /* make sure we have enough space for this guest */
+    if (incoming_posn >= s->nb_peers) {
+        increase_dynamic_storage(s, incoming_posn);
+    }
+
+    if (tmp_fd == -1) {
+        /* if posn is positive and unseen before then this is our posn*/
+        if ((incoming_posn >= 0) &&
+                            (s->peers[incoming_posn].eventfds == NULL)) {
+            /* receive our posn */
+            s->vm_id = incoming_posn;
+            return;
+        } else {
+            /* otherwise an fd == -1 means an existing guest has gone away */
+            IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn);
+            close_guest_eventfds(s, incoming_posn);
+            return;
+        }
+    }
+
+    /* because of the implementation of get_msgfd, we need a dup */
+    incoming_fd = dup(tmp_fd);
+
+    if (incoming_fd == -1) {
+        fprintf(stderr, "could not allocate file descriptor %s\n",
+                                                            strerror(errno));
+        return;
+    }
+
+    /* if the position is -1, then it's shared memory region fd */
+    if (incoming_posn == -1) {
+
+        void * map_ptr;
+
+        s->max_peer = 0;
+
+        if (check_shm_size(s, incoming_fd) == -1) {
+            exit(-1);
+        }
+
+        /* mmap the region and map into the BAR2 */
+        map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+                                                            incoming_fd, 0);
+        s->ivshmem_offset = qemu_ram_alloc_from_ptr(&s->dev.qdev,
+                                    "ivshmem.bar2", s->ivshmem_size, map_ptr);
+
+        IVSHMEM_DPRINTF("guest pci addr = %" FMT_PCIBUS ", guest h/w addr = %"
+                         PRIu64 ", size = %" PRIu64 "\n", s->shm_pci_addr,
+                         s->ivshmem_offset, s->ivshmem_size);
+
+        if (s->shm_pci_addr > 0) {
+            /* map memory into BAR2 */
+            cpu_register_physical_memory(s->shm_pci_addr, s->ivshmem_size,
+                                                            s->ivshmem_offset);
+        }
+
+        /* only store the fd if it is successfully mapped */
+        s->shm_fd = incoming_fd;
+
+        return;
+    }
+
+    /* each guest has an array of eventfds, and we keep track of how many
+     * guests for each VM */
+    guest_max_eventfd = s->peers[incoming_posn].nb_eventfds;
+
+    if (guest_max_eventfd == 0) {
+        /* one eventfd per MSI vector */
+        s->peers[incoming_posn].eventfds = (int *) qemu_malloc(s->vectors *
+                                                                sizeof(int));
+    }
+
+    /* this is an eventfd for a particular guest VM */
+    IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn,
+                                            guest_max_eventfd, incoming_fd);
+    s->peers[incoming_posn].eventfds[guest_max_eventfd] = incoming_fd;
+
+    /* increment count for particular guest */
+    s->peers[incoming_posn].nb_eventfds++;
+
+    /* keep track of the maximum VM ID */
+    if (incoming_posn > s->max_peer) {
+        s->max_peer = incoming_posn;
+    }
+
+    if (incoming_posn == s->vm_id) {
+        s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s,
+                   s->peers[s->vm_id].eventfds[guest_max_eventfd],
+                   guest_max_eventfd);
+    }
+
+    if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
+        if (kvm_set_ioeventfd_mmio_long(incoming_fd, s->mmio_addr + DOORBELL,
+                        (incoming_posn << 16) | guest_max_eventfd, 1) < 0) {
+            fprintf(stderr, "ivshmem: ioeventfd not available\n");
+        }
+    }
+
+    return;
+}
+
+static void ivshmem_reset(DeviceState *d)
+{
+    IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d);
+
+    s->intrstatus = 0;
+    return;
+}
+
+static void ivshmem_mmio_map(PCIDevice *pci_dev, int region_num,
+                       pcibus_t addr, pcibus_t size, int type)
+{
+    IVShmemState *s = DO_UPCAST(IVShmemState, dev, pci_dev);
+
+    s->mmio_addr = addr;
+    cpu_register_physical_memory(addr + 0, IVSHMEM_REG_BAR_SIZE,
+                                                s->ivshmem_mmio_io_addr);
+
+    if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
+        setup_ioeventfds(s);
+    }
+}
+
+static uint64_t ivshmem_get_size(IVShmemState * s) {
+
+    uint64_t value;
+    char *ptr;
+
+    value = strtoull(s->sizearg, &ptr, 10);
+    switch (*ptr) {
+        case 0: case 'M': case 'm':
+            value <<= 20;
+            break;
+        case 'G': case 'g':
+            value <<= 30;
+            break;
+        default:
+            fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg);
+            exit(1);
+    }
+
+    /* BARs must be a power of 2 */
+    if (!is_power_of_two(value)) {
+        fprintf(stderr, "ivshmem: size must be power of 2\n");
+        exit(1);
+    }
+
+    return value;
+}
+
+static void ivshmem_setup_msi(IVShmemState * s) {
+
+    int i;
+
+    /* allocate the MSI-X vectors */
+
+    if (!msix_init(&s->dev, s->vectors, 1, 0)) {
+        pci_register_bar(&s->dev, 1,
+                         msix_bar_size(&s->dev),
+                         PCI_BASE_ADDRESS_SPACE_MEMORY,
+                         msix_mmio_map);
+        IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
+    } else {
+        IVSHMEM_DPRINTF("msix initialization failed\n");
+        exit(1);
+    }
+
+    /* 'activate' the vectors */
+    for (i = 0; i < s->vectors; i++) {
+        msix_vector_use(&s->dev, i);
+    }
+
+    /* allocate Qemu char devices for receiving interrupts */
+    s->eventfd_table = qemu_mallocz(s->vectors * sizeof(EventfdEntry));
+}
+
+static void ivshmem_save(QEMUFile* f, void *opaque)
+{
+    IVShmemState *proxy = opaque;
+
+    IVSHMEM_DPRINTF("ivshmem_save\n");
+    pci_device_save(&proxy->dev, f);
+
+    if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
+        msix_save(&proxy->dev, f);
+    } else {
+        qemu_put_be32(f, proxy->intrstatus);
+        qemu_put_be32(f, proxy->intrmask);
+    }
+
+}
+
+static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
+{
+    IVSHMEM_DPRINTF("ivshmem_load\n");
+
+    IVShmemState *proxy = opaque;
+    int ret, i;
+
+    if (version_id > 0) {
+        return -EINVAL;
+    }
+
+    if (proxy->role_val == IVSHMEM_PEER) {
+        fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n");
+        return -EINVAL;
+    }
+
+    ret = pci_device_load(&proxy->dev, f);
+    if (ret) {
+        return ret;
+    }
+
+    if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
+        msix_load(&proxy->dev, f);
+        for (i = 0; i < proxy->vectors; i++) {
+            msix_vector_use(&proxy->dev, i);
+        }
+    } else {
+        proxy->intrstatus = qemu_get_be32(f);
+        proxy->intrmask = qemu_get_be32(f);
+    }
+
+    return 0;
+}
+
+static int pci_ivshmem_init(PCIDevice *dev)
+{
+    IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
+    uint8_t *pci_conf;
+
+    if (s->sizearg == NULL)
+        s->ivshmem_size = 4 << 20; /* 4 MB default */
+    else {
+        s->ivshmem_size = ivshmem_get_size(s);
+    }
+
+    register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
+                                                                        dev);
+
+    /* IRQFD requires MSI */
+    if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
+        !ivshmem_has_feature(s, IVSHMEM_MSI)) {
+        fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n");
+        exit(1);
+    }
+
+    /* check that role is reasonable */
+    if (s->role) {
+        if (strncmp(s->role, "peer", 5) == 0) {
+            s->role_val = IVSHMEM_PEER;
+        } else if (strncmp(s->role, "master", 7) == 0) {
+            s->role_val = IVSHMEM_MASTER;
+        } else {
+            fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n");
+            exit(1);
+        }
+    } else {
+        s->role_val = IVSHMEM_MASTER; /* default */
+    }
+
+    if (s->role_val == IVSHMEM_PEER) {
+        register_device_unmigratable(&s->dev.qdev, "ivshmem", s);
+    }
+
+    pci_conf = s->dev.config;
+    pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_REDHAT_QUMRANET);
+    pci_conf[0x02] = 0x10;
+    pci_conf[0x03] = 0x11;
+    pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+    pci_config_set_class(pci_conf, PCI_CLASS_MEMORY_RAM);
+    pci_conf[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL;
+
+    pci_config_set_interrupt_pin(pci_conf, 1);
+
+    s->shm_pci_addr = 0;
+    s->ivshmem_offset = 0;
+    s->shm_fd = 0;
+
+    s->ivshmem_mmio_io_addr = cpu_register_io_memory(ivshmem_mmio_read,
+                                    ivshmem_mmio_write, s);
+    /* region for registers*/
+    pci_register_bar(&s->dev, 0, IVSHMEM_REG_BAR_SIZE,
+                           PCI_BASE_ADDRESS_SPACE_MEMORY, ivshmem_mmio_map);
+
+    if ((s->server_chr != NULL) &&
+                        (strncmp(s->server_chr->filename, "unix:", 5) == 0)) {
+        /* if we get a UNIX socket as the parameter we will talk
+         * to the ivshmem server to receive the memory region */
+
+        if (s->shmobj != NULL) {
+            fprintf(stderr, "WARNING: do not specify both 'chardev' "
+                                                "and 'shm' with ivshmem\n");
+        }
+
+        IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
+                                                    s->server_chr->filename);
+
+        if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+            ivshmem_setup_msi(s);
+        }
+
+        /* we allocate enough space for 16 guests and grow as needed */
+        s->nb_peers = 16;
+        s->vm_id = -1;
+
+        /* allocate/initialize space for interrupt handling */
+        s->peers = qemu_mallocz(s->nb_peers * sizeof(Peer));
+
+        pci_register_bar(&s->dev, 2, s->ivshmem_size,
+                                PCI_BASE_ADDRESS_SPACE_MEMORY, ivshmem_map);
+
+        s->eventfd_chr = qemu_mallocz(s->vectors * sizeof(CharDriverState *));
+
+        qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read,
+                     ivshmem_event, s);
+    } else {
+        /* just map the file immediately, we're not using a server */
+        int fd;
+
+        if (s->shmobj == NULL) {
+            fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n");
+        }
+
+        IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
+
+        /* try opening with O_EXCL and if it succeeds zero the memory
+         * by truncating to 0 */
+        if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL,
+                        S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
+           /* truncate file to length PCI device's memory */
+            if (ftruncate(fd, s->ivshmem_size) != 0) {
+                fprintf(stderr, "ivshmem: could not truncate shared file\n");
+            }
+
+        } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
+                        S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
+            fprintf(stderr, "ivshmem: could not open shared file\n");
+            exit(-1);
+
+        }
+
+        if (check_shm_size(s, fd) == -1) {
+            exit(-1);
+        }
+
+        create_shared_memory_BAR(s, fd);
+
+    }
+
+    return 0;
+}
+
+static int pci_ivshmem_uninit(PCIDevice *dev)
+{
+    IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
+
+    cpu_unregister_io_memory(s->ivshmem_mmio_io_addr);
+    unregister_savevm(&dev->qdev, "ivshmem", s);
+
+    return 0;
+}
+
+static PCIDeviceInfo ivshmem_info = {
+    .qdev.name  = "ivshmem",
+    .qdev.size  = sizeof(IVShmemState),
+    .qdev.reset = ivshmem_reset,
+    .init       = pci_ivshmem_init,
+    .exit       = pci_ivshmem_uninit,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
+        DEFINE_PROP_STRING("size", IVShmemState, sizearg),
+        DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
+        DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false),
+        DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
+        DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
+        DEFINE_PROP_STRING("role", IVShmemState, role),
+        DEFINE_PROP_END_OF_LIST(),
+    }
+};
+
+static void ivshmem_register_devices(void)
+{
+    pci_qdev_register(&ivshmem_info);
+}
+
+device_init(ivshmem_register_devices)
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index f43f2d09..b64dd31 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -485,16 +485,26 @@
     return buflen;
 }
 
-static int mode_sense_page(SCSIRequest *req, int page, uint8_t *p)
+static int mode_sense_page(SCSIRequest *req, int page, uint8_t *p,
+                           int page_control)
 {
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);
     BlockDriverState *bdrv = s->bs;
     int cylinders, heads, secs;
 
+    /*
+     * If Changeable Values are requested, a mask denoting those mode parameters
+     * that are changeable shall be returned. As we currently don't support
+     * parameter changes via MODE_SELECT all bits are returned set to zero.
+     * The buffer was already menset to zero by the caller of this function.
+     */
     switch (page) {
     case 4: /* Rigid disk device geometry page. */
         p[0] = 4;
         p[1] = 0x16;
+        if (page_control == 1) { /* Changeable Values */
+            return p[1] + 2;
+        }
         /* if a geometry hint is available, use it */
         bdrv_get_geometry_hint(bdrv, &cylinders, &heads, &secs);
         p[2] = (cylinders >> 16) & 0xff;
@@ -519,11 +529,14 @@
         /* Medium rotation rate [rpm], 5400 rpm */
         p[20] = (5400 >> 8) & 0xff;
         p[21] = 5400 & 0xff;
-        return 0x16;
+        return p[1] + 2;
 
     case 5: /* Flexible disk device geometry page. */
         p[0] = 5;
         p[1] = 0x1e;
+        if (page_control == 1) { /* Changeable Values */
+            return p[1] + 2;
+        }
         /* Transfer rate [kbit/s], 5Mbit/s */
         p[2] = 5000 >> 8;
         p[3] = 5000 & 0xff;
@@ -555,21 +568,27 @@
         /* Medium rotation rate [rpm], 5400 rpm */
         p[28] = (5400 >> 8) & 0xff;
         p[29] = 5400 & 0xff;
-        return 0x1e;
+        return p[1] + 2;
 
     case 8: /* Caching page.  */
         p[0] = 8;
         p[1] = 0x12;
+        if (page_control == 1) { /* Changeable Values */
+            return p[1] + 2;
+        }
         if (bdrv_enable_write_cache(s->bs)) {
             p[2] = 4; /* WCE */
         }
-        return 20;
+        return p[1] + 2;
 
     case 0x2a: /* CD Capabilities and Mechanical Status page. */
         if (bdrv_get_type_hint(bdrv) != BDRV_TYPE_CDROM)
             return 0;
         p[0] = 0x2a;
         p[1] = 0x14;
+        if (page_control == 1) { /* Changeable Values */
+            return p[1] + 2;
+        }
         p[2] = 3; // CD-R & CD-RW read
         p[3] = 0; // Writing not supported
         p[4] = 0x7f; /* Audio, composite, digital out,
@@ -593,7 +612,7 @@
         p[19] = (16 * 176) & 0xff;
         p[20] = (16 * 176) >> 8; // 16x write speed current
         p[21] = (16 * 176) & 0xff;
-        return 22;
+        return p[1] + 2;
 
     default:
         return 0;
@@ -604,29 +623,46 @@
 {
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);
     uint64_t nb_sectors;
-    int page, dbd, buflen;
+    int page, dbd, buflen, page_control;
     uint8_t *p;
+    uint8_t dev_specific_param;
 
     dbd = req->cmd.buf[1]  & 0x8;
     page = req->cmd.buf[2] & 0x3f;
-    DPRINTF("Mode Sense (page %d, len %zd)\n", page, req->cmd.xfer);
+    page_control = (req->cmd.buf[2] & 0xc0) >> 6;
+    DPRINTF("Mode Sense(%d) (page %d, len %d, page_control %d)\n",
+        (req->cmd.buf[0] == MODE_SENSE) ? 6 : 10, page, len, page_control);
     memset(outbuf, 0, req->cmd.xfer);
     p = outbuf;
 
-    p[1] = 0; /* Default media type.  */
-    p[3] = 0; /* Block descriptor length.  */
     if (bdrv_is_read_only(s->bs)) {
-        p[2] = 0x80; /* Readonly.  */
+        dev_specific_param = 0x80; /* Readonly.  */
+    } else {
+        dev_specific_param = 0x00;
     }
-    p += 4;
+
+    if (req->cmd.buf[0] == MODE_SENSE) {
+        p[1] = 0; /* Default media type.  */
+        p[2] = dev_specific_param;
+        p[3] = 0; /* Block descriptor length.  */
+        p += 4;
+    } else { /* MODE_SENSE_10 */
+        p[2] = 0; /* Default media type.  */
+        p[3] = dev_specific_param;
+        p[6] = p[7] = 0; /* Block descriptor length.  */
+        p += 8;
+    }
 
     bdrv_get_geometry(s->bs, &nb_sectors);
-    if ((~dbd) & nb_sectors) {
-        outbuf[3] = 8; /* Block descriptor length  */
+    if (!dbd && nb_sectors) {
+        if (req->cmd.buf[0] == MODE_SENSE) {
+            outbuf[3] = 8; /* Block descriptor length  */
+        } else { /* MODE_SENSE_10 */
+            outbuf[7] = 8; /* Block descriptor length  */
+        }
         nb_sectors /= s->cluster_size;
-        nb_sectors--;
         if (nb_sectors > 0xffffff)
-            nb_sectors = 0xffffff;
+            nb_sectors = 0;
         p[0] = 0; /* media density code */
         p[1] = (nb_sectors >> 16) & 0xff;
         p[2] = (nb_sectors >> 8) & 0xff;
@@ -638,21 +674,37 @@
         p += 8;
     }
 
+    if (page_control == 3) { /* Saved Values */
+        return -1; /* ILLEGAL_REQUEST */
+    }
+
     switch (page) {
     case 0x04:
     case 0x05:
     case 0x08:
     case 0x2a:
-        p += mode_sense_page(req, page, p);
+        p += mode_sense_page(req, page, p, page_control);
         break;
     case 0x3f:
-        p += mode_sense_page(req, 0x08, p);
-        p += mode_sense_page(req, 0x2a, p);
+        p += mode_sense_page(req, 0x08, p, page_control);
+        p += mode_sense_page(req, 0x2a, p, page_control);
         break;
+    default:
+        return -1; /* ILLEGAL_REQUEST */
     }
 
     buflen = p - outbuf;
-    outbuf[0] = buflen - 4;
+    /*
+     * The mode data length field specifies the length in bytes of the
+     * following data that is available to be transferred. The mode data
+     * length does not include itself.
+     */
+    if (req->cmd.buf[0] == MODE_SENSE) {
+        outbuf[0] = buflen - 1;
+    } else { /* MODE_SENSE_10 */
+        outbuf[0] = ((buflen - 2) >> 8) & 0xff;
+        outbuf[1] = (buflen - 2) & 0xff;
+    }
     if (buflen > req->cmd.xfer)
         buflen = req->cmd.xfer;
     return buflen;
diff --git a/hw/slavio_timer.c b/hw/slavio_timer.c
index d787553..c125de4 100644
--- a/hw/slavio_timer.c
+++ b/hw/slavio_timer.c
@@ -377,12 +377,12 @@
         curr_timer->limit = 0;
         curr_timer->count = 0;
         curr_timer->reached = 0;
-        if (i < s->num_cpus) {
+        if (i <= s->num_cpus) {
             ptimer_set_limit(curr_timer->timer,
                              LIMIT_TO_PERIODS(TIMER_MAX_COUNT32), 1);
             ptimer_run(curr_timer->timer, 0);
+            curr_timer->running = 1;
         }
-        curr_timer->running = 1;
     }
     s->cputimer_mode = 0;
 }
diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index 1e4dfdd..910438f 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -30,6 +30,10 @@
 #include <sys/mman.h>
 #endif
 
+/* Disable guest-provided stats by now (https://bugzilla.redhat.com/show_bug.cgi?id=623903) */
+#define ENABLE_GUEST_STATS   0
+
+
 typedef struct VirtIOBalloon
 {
     VirtIODevice vdev;
@@ -84,12 +88,14 @@
                                   VIRTIO_BALLOON_PFN_SHIFT);
 
     stat_put(dict, "actual", actual);
+#if ENABLE_GUEST_STATS
     stat_put(dict, "mem_swapped_in", dev->stats[VIRTIO_BALLOON_S_SWAP_IN]);
     stat_put(dict, "mem_swapped_out", dev->stats[VIRTIO_BALLOON_S_SWAP_OUT]);
     stat_put(dict, "major_page_faults", dev->stats[VIRTIO_BALLOON_S_MAJFLT]);
     stat_put(dict, "minor_page_faults", dev->stats[VIRTIO_BALLOON_S_MINFLT]);
     stat_put(dict, "free_mem", dev->stats[VIRTIO_BALLOON_S_MEMFREE]);
     stat_put(dict, "total_mem", dev->stats[VIRTIO_BALLOON_S_MEMTOT]);
+#endif
 
     return QOBJECT(dict);
 }
@@ -215,7 +221,7 @@
         }
         dev->stats_callback = cb;
         dev->stats_opaque_callback_data = cb_data; 
-        if (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ)) {
+        if (ENABLE_GUEST_STATS && (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ))) {
             virtqueue_push(dev->svq, &dev->stats_vq_elem, dev->stats_vq_offset);
             virtio_notify(&dev->vdev, dev->svq);
         } else {
diff --git a/kvm-all.c b/kvm-all.c
index 0b5ce92..00cecf6 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1268,6 +1268,38 @@
     return r;
 }
 
+int kvm_set_ioeventfd_mmio_long(int fd, uint32_t addr, uint32_t val, bool assign)
+{
+#ifdef KVM_IOEVENTFD
+    int ret;
+    struct kvm_ioeventfd iofd;
+
+    iofd.datamatch = val;
+    iofd.addr = addr;
+    iofd.len = 4;
+    iofd.flags = KVM_IOEVENTFD_FLAG_DATAMATCH;
+    iofd.fd = fd;
+
+    if (!kvm_enabled()) {
+        return -ENOSYS;
+    }
+
+    if (!assign) {
+        iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
+    }
+
+    ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
+
+    if (ret < 0) {
+        return -errno;
+    }
+
+    return 0;
+#else
+    return -ENOSYS;
+#endif
+}
+
 int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
 {
 #ifdef KVM_IOEVENTFD
diff --git a/kvm-stub.c b/kvm-stub.c
index 3378bd3..d45f9fa 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -136,3 +136,8 @@
 {
     return -ENOSYS;
 }
+
+int kvm_set_ioeventfd_mmio_long(int fd, uint32_t adr, uint32_t val, bool assign)
+{
+    return -ENOSYS;
+}
diff --git a/kvm.h b/kvm.h
index 95f8419..d321fce 100644
--- a/kvm.h
+++ b/kvm.h
@@ -182,6 +182,7 @@
 }
 
 #endif
+int kvm_set_ioeventfd_mmio_long(int fd, uint32_t adr, uint32_t val, bool assign);
 
 #if defined(KVM_IRQFD) && defined(CONFIG_KVM)
 int kvm_set_irqfd(int gsi, int fd, bool assigned);
diff --git a/migration.c b/migration.c
index 650eb78..468d517 100644
--- a/migration.c
+++ b/migration.c
@@ -67,6 +67,8 @@
     qemu_announce_self();
     DPRINTF("successfully loaded vm state\n");
 
+    incoming_expected = false;
+
     if (autostart)
         vm_start();
 }
@@ -314,8 +316,14 @@
     if (ret == -1)
         ret = -(s->get_error(s));
 
-    if (ret == -EAGAIN)
+    if (ret == -EAGAIN) {
         qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
+    } else if (ret < 0) {
+        if (s->mon) {
+            monitor_resume(s->mon);
+        }
+        s->state = MIG_STATE_ERROR;
+    }
 
     return ret;
 }
diff --git a/monitor.c b/monitor.c
index e51df62..dd5469f 100644
--- a/monitor.c
+++ b/monitor.c
@@ -670,17 +670,32 @@
 static void do_info_version_print(Monitor *mon, const QObject *data)
 {
     QDict *qdict;
+    QDict *qemu;
 
     qdict = qobject_to_qdict(data);
+    qemu = qdict_get_qdict(qdict, "qemu");
 
-    monitor_printf(mon, "%s%s\n", qdict_get_str(qdict, "qemu"),
-                                  qdict_get_str(qdict, "package"));
+    monitor_printf(mon, "%" PRId64 ".%" PRId64 ".%" PRId64 "%s\n",
+                  qdict_get_int(qemu, "major"),
+                  qdict_get_int(qemu, "minor"),
+                  qdict_get_int(qemu, "micro"),
+                  qdict_get_str(qdict, "package"));
 }
 
 static void do_info_version(Monitor *mon, QObject **ret_data)
 {
-    *ret_data = qobject_from_jsonf("{ 'qemu': %s, 'package': %s }",
-                                   QEMU_VERSION, QEMU_PKGVERSION);
+    const char *version = QEMU_VERSION;
+    int major = 0, minor = 0, micro = 0;
+    char *tmp;
+
+    major = strtol(version, &tmp, 10);
+    tmp++;
+    minor = strtol(tmp, &tmp, 10);
+    tmp++;
+    micro = strtol(tmp, &tmp, 10);
+
+    *ret_data = qobject_from_jsonf("{ 'qemu': { 'major': %d, 'minor': %d, \
+        'micro': %d }, 'package': %s }", major, minor, micro, QEMU_PKGVERSION);
 }
 
 static void do_info_name_print(Monitor *mon, const QObject *data)
@@ -1082,6 +1097,10 @@
 {
     struct bdrv_iterate_context context = { mon, 0 };
 
+    if (incoming_expected) {
+        qerror_report(QERR_MIGRATION_EXPECTED);
+        return -1;
+    }
     bdrv_iterate(encrypted_bdrv_it, &context);
     /* only resume the vm if all keys are set and valid */
     if (!context.err) {
diff --git a/qemu-char.c b/qemu-char.c
index 9b69d92..6a3952c 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2087,6 +2087,12 @@
     }
 }
 
+CharDriverState *qemu_chr_open_eventfd(int eventfd){
+
+    return qemu_chr_open_fd(eventfd, eventfd);
+
+}
+
 static void tcp_chr_connect(void *opaque)
 {
     CharDriverState *chr = opaque;
diff --git a/qemu-char.h b/qemu-char.h
index e3a0783..6ea01ba 100644
--- a/qemu-char.h
+++ b/qemu-char.h
@@ -94,6 +94,9 @@
 void qemu_chr_info(Monitor *mon, QObject **ret_data);
 CharDriverState *qemu_chr_find(const char *name);
 
+/* add an eventfd to the qemu devices that are polled */
+CharDriverState *qemu_chr_open_eventfd(int eventfd);
+
 extern int term_escape_char;
 
 /* async I/O support */
diff --git a/qemu-doc.texi b/qemu-doc.texi
index e67bf44..55a966f 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -706,6 +706,49 @@
 that span several QEMU instances. See @ref{sec_invocation} to have a
 basic example.
 
+@section Other Devices
+
+@subsection Inter-VM Shared Memory device
+
+With KVM enabled on a Linux host, a shared memory device is available.  Guests
+map a POSIX shared memory region into the guest as a PCI device that enables
+zero-copy communication to the application level of the guests.  The basic
+syntax is:
+
+@example
+qemu -device ivshmem,size=<size in format accepted by -m>[,shm=<shm name>]
+@end example
+
+If desired, interrupts can be sent between guest VMs accessing the same shared
+memory region.  Interrupt support requires using a shared memory server and
+using a chardev socket to connect to it.  The code for the shared memory server
+is qemu.git/contrib/ivshmem-server.  An example syntax when using the shared
+memory server is:
+
+@example
+qemu -device ivshmem,size=<size in format accepted by -m>[,chardev=<id>]
+                        [,msi=on][,ioeventfd=on][,vectors=n][,role=peer|master]
+qemu -chardev socket,path=<path>,id=<id>
+@end example
+
+When using the server, the guest will be assigned a VM ID (>=0) that allows guests
+using the same server to communicate via interrupts.  Guests can read their
+VM ID from a device register (see example code).  Since receiving the shared
+memory region from the server is asynchronous, there is a (small) chance the
+guest may boot before the shared memory is attached.  To allow an application
+to ensure shared memory is attached, the VM ID register will return -1 (an
+invalid VM ID) until the memory is attached.  Once the shared memory is
+attached, the VM ID will return the guest's valid VM ID.  With these semantics,
+the guest application can check to ensure the shared memory is attached to the
+guest before proceeding.
+
+The @option{role} argument can be set to either master or peer and will affect
+how the shared memory is migrated.  With @option{role=master}, the guest will
+copy the shared memory on migration to the destination host.  With
+@option{role=peer}, the guest will not be able to migrate with the device attached.
+With the @option{peer} case, the device should be detached and then reattached
+after migration using the PCI hotplug support.
+
 @node direct_linux_boot
 @section Direct Linux Boot
 
diff --git a/qemu-img.c b/qemu-img.c
index d2a978b..4e035e4 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -783,7 +783,8 @@
         goto out;
     }
 
-    out_bs = bdrv_new_open(out_filename, out_fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
+    out_bs = bdrv_new_open(out_filename, out_fmt,
+        BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH);
     if (!out_bs) {
         ret = -1;
         goto out;
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index da7b796..595d362 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -35,7 +35,29 @@
 
 NOTE: This document is temporary and will be replaced soon.
 
-1. Regular Commands
+1. Stability Considerations
+===========================
+
+The current QMP command set (described in this file) may be useful for a
+number of use cases, however it's limited and several commands have bad
+defined semantics, specially with regard to command completion.
+
+These problems are going to be solved incrementally in the next QEMU releases
+and we're going to establish a deprecation policy for badly defined commands.
+
+If you're planning to adopt QMP, please observe the following:
+
+    1. The deprecation policy will take efect and be documented soon, please
+       check the documentation of each used command as soon as a new release of
+       QEMU is available
+
+    2. DO NOT rely on anything which is not explicit documented
+
+    3. Errors, in special, are not documented. Applications should NOT check
+       for specific errors classes or data (it's strongly recommended to only
+       check for the "error" key)
+
+2. Regular Commands
 ===================
 
 Server's responses in the examples below are always a success response, please
@@ -1605,7 +1627,7 @@
 
 SQMP
 
-2. Query Commands
+3. Query Commands
 =================
 
 EQMP
@@ -1636,13 +1658,25 @@
 
 Return a json-object with the following information:
 
-- "qemu": QEMU's version (json-string)
+- "qemu": A json-object containing three integer values:
+    - "major": QEMU's major version (json-int)
+    - "minor": QEMU's minor version (json-int)
+    - "micro": QEMU's micro version (json-int)
 - "package": package's version (json-string)
 
 Example:
 
 -> { "execute": "query-version" }
-<- { "return": { "qemu": "0.11.50", "package": "" } }
+<- {
+      "return":{
+         "qemu":{
+            "major":0,
+            "minor":11,
+            "micro":5
+         },
+         "package":""
+      }
+   }
 
 EQMP
 
diff --git a/qerror.c b/qerror.c
index 2f6f590..0af3ab3 100644
--- a/qerror.c
+++ b/qerror.c
@@ -141,6 +141,10 @@
         .desc      = "Using KVM without %(capability), %(feature) unavailable",
     },
     {
+        .error_fmt = QERR_MIGRATION_EXPECTED,
+        .desc      = "An incoming migration is expected before this command can be executed",
+    },
+    {
         .error_fmt = QERR_MISSING_PARAMETER,
         .desc      = "Parameter '%(name)' is missing",
     },
diff --git a/qerror.h b/qerror.h
index 9ad00b4..62802ea 100644
--- a/qerror.h
+++ b/qerror.h
@@ -121,6 +121,9 @@
 #define QERR_KVM_MISSING_CAP \
     "{ 'class': 'KVMMissingCap', 'data': { 'capability': %s, 'feature': %s } }"
 
+#define QERR_MIGRATION_EXPECTED \
+    "{ 'class': 'MigrationExpected', 'data': {} }"
+
 #define QERR_MISSING_PARAMETER \
     "{ 'class': 'MissingParameter', 'data': { 'name': %s } }"
 
diff --git a/savevm.c b/savevm.c
index 681f0fb..8d7e257 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1041,6 +1041,7 @@
     const VMStateDescription *vmsd;
     void *opaque;
     CompatEntry *compat;
+    int no_migrate;
 } SaveStateEntry;
 
 
@@ -1104,6 +1105,7 @@
     se->load_state = load_state;
     se->opaque = opaque;
     se->vmsd = NULL;
+    se->no_migrate = 0;
 
     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
         char *id = dev->parent_bus->info->get_dev_path(dev);
@@ -1170,6 +1172,31 @@
     }
 }
 
+/* mark a device as not to be migrated, that is the device should be
+   unplugged before migration */
+void register_device_unmigratable(DeviceState *dev, const char *idstr,
+                                                            void *opaque)
+{
+    SaveStateEntry *se;
+    char id[256] = "";
+
+    if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
+        char *path = dev->parent_bus->info->get_dev_path(dev);
+        if (path) {
+            pstrcpy(id, sizeof(id), path);
+            pstrcat(id, sizeof(id), "/");
+            qemu_free(path);
+        }
+    }
+    pstrcat(id, sizeof(id), idstr);
+
+    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
+        if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
+            se->no_migrate = 1;
+        }
+    }
+}
+
 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
                                    const VMStateDescription *vmsd,
                                    void *opaque, int alias_id,
@@ -1376,13 +1403,19 @@
     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
 }
 
-static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
+static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
 {
+    if (se->no_migrate) {
+        return -1;
+    }
+
     if (!se->vmsd) {         /* Old style */
         se->save_state(f, se->opaque);
-        return;
+        return 0;
     }
     vmstate_save_state(f,se->vmsd, se->opaque);
+
+    return 0;
 }
 
 #define QEMU_VM_FILE_MAGIC           0x5145564d
@@ -1477,6 +1510,7 @@
 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
 {
     SaveStateEntry *se;
+    int r;
 
     cpu_synchronize_all_states();
 
@@ -1509,7 +1543,11 @@
         qemu_put_be32(f, se->instance_id);
         qemu_put_be32(f, se->version_id);
 
-        vmstate_save(f, se);
+        r = vmstate_save(f, se);
+        if (r < 0) {
+            monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
+            return r;
+        }
     }
 
     qemu_put_byte(f, QEMU_VM_EOF);
diff --git a/sysemu.h b/sysemu.h
index bf1d68a..98bd47d 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -100,6 +100,7 @@
 } DisplayType;
 
 extern int autostart;
+extern int incoming_expected;
 extern int bios_size;
 
 typedef enum {
diff --git a/ui/vnc.c b/ui/vnc.c
index 7fc40ac..c7a1831 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1184,7 +1184,7 @@
     vnc_lock_output(vs);
     if (vs->output.offset) {
         vnc_client_write_locked(opaque);
-    } else {
+    } else if (vs->csock != -1) {
         qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, NULL, vs);
     }
     vnc_unlock_output(vs);
diff --git a/vl.c b/vl.c
index de8bad1..84b5a95 100644
--- a/vl.c
+++ b/vl.c
@@ -183,6 +183,7 @@
 NICInfo nd_table[MAX_NICS];
 int vm_running;
 int autostart;
+int incoming_expected; /* Started with -incoming and waiting for incoming */
 static int rtc_utc = 1;
 static int rtc_date_offset = -1; /* -1 means no change */
 QEMUClock *rtc_clock;
@@ -2629,6 +2630,7 @@
                 break;
             case QEMU_OPTION_incoming:
                 incoming = optarg;
+                incoming_expected = true;
                 break;
             case QEMU_OPTION_nodefaults:
                 default_serial = 0;