Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

Block pull request

# gpg: Signature made Fri 09 May 2014 19:57:53 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/block-pull-request:
  glib: fix g_poll early timeout on windows
  block: qemu-iotests - test for live migration
  block: qemu-iotests - update 085 to use common.qemu
  block: qemu-iotests - add common.qemu, for bash-controlled qemu tests
  block/raw-posix: Try both FIEMAP and SEEK_HOLE
  gluster: Correctly propagate errors when volume isn't accessible
  vl.c: remove init_clocks call from main
  block: Fix open flags with BDRV_O_SNAPSHOT
  qemu-iotests: Test converting to streamOptimized from small cluster size
  vmdk: Implement .bdrv_get_info()
  vmdk: Implement .bdrv_write_compressed
  qemu-img: Convert by cluster size if target is compressed
  block/iscsi: bump year in copyright notice
  block/nfs: Check for NULL server part
  qemu-img: sort block formats in help message
  iotests: Use configured python
  qcow2: Fix alloc_clusters_noref() overflow detection

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

32 files changed, 744 insertions, 178 deletions

diff --git a/block.c b/block.c
index b749d31ad..c90c71aa3 100644
--- a/block.c
+++ b/block.c
@@ -775,6 +775,16 @@ void bdrv_disable_copy_on_read(BlockDriverState *bs)
 }
 
 /*
+ * Returns the flags that a temporary snapshot should get, based on the
+ * originally requested flags (the originally requested image will have flags
+ * like a backing file)
+ */
+static int bdrv_temp_snapshot_flags(int flags)
+{
+    return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY;
+}
+
+/*
  * Returns the flags that bs->file should get, based on the given flags for
  * the parent BDS
  */
@@ -787,11 +797,6 @@ static int bdrv_inherited_flags(int flags)
      * so we can enable both unconditionally on lower layers. */
     flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP;
 
-    /* The backing file of a temporary snapshot is read-only */
-    if (flags & BDRV_O_SNAPSHOT) {
-        flags &= ~BDRV_O_RDWR;
-    }
-
     /* Clear flags that only apply to the top layer */
     flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ);
 
@@ -817,11 +822,6 @@ static int bdrv_open_flags(BlockDriverState *bs, int flags)
 {
     int open_flags = flags | BDRV_O_CACHE_WB;
 
-    /* The backing file of a temporary snapshot is read-only */
-    if (flags & BDRV_O_SNAPSHOT) {
-        open_flags &= ~BDRV_O_RDWR;
-    }
-
     /*
      * Clear flags that are internal to the block layer before opening the
      * image.
@@ -1206,7 +1206,7 @@ done:
     return ret;
 }
 
-void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp)
+void bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp)
 {
     /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
     char *tmp_filename = g_malloc0(PATH_MAX + 1);
@@ -1262,8 +1262,7 @@ void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp)
     bs_snapshot = bdrv_new("", &error_abort);
 
     ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options,
-                    (bs->open_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY,
-                    bdrv_qcow2, &local_err);
+                    flags, bdrv_qcow2, &local_err);
     if (ret < 0) {
         error_propagate(errp, local_err);
         goto out;
@@ -1298,6 +1297,7 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
     BlockDriverState *file = NULL, *bs;
     const char *drvname;
     Error *local_err = NULL;
+    int snapshot_flags = 0;
 
     assert(pbs);
 
@@ -1358,6 +1358,10 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
     if (flags & BDRV_O_RDWR) {
         flags |= BDRV_O_ALLOW_RDWR;
     }
+    if (flags & BDRV_O_SNAPSHOT) {
+        snapshot_flags = bdrv_temp_snapshot_flags(flags);
+        flags = bdrv_backing_flags(flags);
+    }
 
     assert(file == NULL);
     ret = bdrv_open_image(&file, filename, options, "file",
@@ -1417,8 +1421,8 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
 
     /* For snapshot=on, create a temporary qcow2 overlay. bs points to the
      * temporary snapshot afterwards. */
-    if (flags & BDRV_O_SNAPSHOT) {
-        bdrv_append_temp_snapshot(bs, &local_err);
+    if (snapshot_flags) {
+        bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             goto close_and_fail;
diff --git a/block/gluster.c b/block/gluster.c
index 883608564..d0726ec92 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -207,6 +207,11 @@ static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename,
                          "volume=%s image=%s transport=%s", gconf->server,
                          gconf->port, gconf->volname, gconf->image,
                          gconf->transport);
+
+        /* glfs_init sometimes doesn't set errno although docs suggest that */
+        if (errno == 0)
+            errno = EINVAL;
+
         goto out;
     }
     return glfs;
@@ -482,7 +487,7 @@ static int qemu_gluster_create(const char *filename,
 
     glfs = qemu_gluster_init(gconf, filename, errp);
     if (!glfs) {
-        ret = -EINVAL;
+        ret = -errno;
         goto out;
     }
 
diff --git a/block/iscsi.c b/block/iscsi.c
index a30202b4f..52355b8bc 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2,7 +2,7 @@
  * QEMU Block driver for iSCSI images
  *
  * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
- * Copyright (c) 2012-2013 Peter Lieven <pl@kamp.de>
+ * Copyright (c) 2012-2014 Peter Lieven <pl@kamp.de>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
diff --git a/block/nfs.c b/block/nfs.c
index 9fa831f16..539bd951d 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -256,6 +256,10 @@ static int64_t nfs_client_open(NFSClient *client, const char *filename,
         error_setg(errp, "Invalid URL specified");
         goto fail;
     }
+    if (!uri->server) {
+        error_setg(errp, "Invalid URL specified");
+        goto fail;
+    }
     strp = strrchr(uri->path, '/');
     if (strp == NULL) {
         error_setg(errp, "Invalid URL specified");
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index e79895d11..9507aef84 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -656,7 +656,9 @@ retry:
 
     /* Make sure that all offsets in the "allocated" range are representable
      * in an int64_t */
-    if (s->free_cluster_index - 1 > (INT64_MAX >> s->cluster_bits)) {
+    if (s->free_cluster_index > 0 &&
+        s->free_cluster_index - 1 > (INT64_MAX >> s->cluster_bits))
+    {
         return -EFBIG;
     }
 
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 3ce026db5..6586a0c9e 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -146,6 +146,9 @@ typedef struct BDRVRawState {
     bool has_discard:1;
     bool has_write_zeroes:1;
     bool discard_zeroes:1;
+#ifdef CONFIG_FIEMAP
+    bool skip_fiemap;
+#endif
 } BDRVRawState;
 
 typedef struct BDRVRawReopenState {
@@ -1272,53 +1275,29 @@ static int raw_create(const char *filename, QEMUOptionParameter *options,
     return result;
 }
 
-/*
- * Returns true iff the specified sector is present in the disk image. Drivers
- * not implementing the functionality are assumed to not support backing files,
- * hence all their sectors are reported as allocated.
- *
- * If 'sector_num' is beyond the end of the disk image the return value is 0
- * and 'pnum' is set to 0.
- *
- * 'pnum' is set to the number of sectors (including and immediately following
- * the specified sector) that are known to be in the same
- * allocated/unallocated state.
- *
- * 'nb_sectors' is the max value 'pnum' should be set to.  If nb_sectors goes
- * beyond the end of the disk image it will be clamped.
- */
-static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
-                                            int64_t sector_num,
-                                            int nb_sectors, int *pnum)
+static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
+                          off_t *hole, int nb_sectors, int *pnum)
 {
-    off_t start, data, hole;
-    int64_t ret;
-
-    ret = fd_open(bs);
-    if (ret < 0) {
-        return ret;
-    }
-
-    start = sector_num * BDRV_SECTOR_SIZE;
-    ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
-
 #ifdef CONFIG_FIEMAP
-
     BDRVRawState *s = bs->opaque;
+    int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
     struct {
         struct fiemap fm;
         struct fiemap_extent fe;
     } f;
 
+    if (s->skip_fiemap) {
+        return -ENOTSUP;
+    }
+
     f.fm.fm_start = start;
     f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
     f.fm.fm_flags = 0;
     f.fm.fm_extent_count = 1;
     f.fm.fm_reserved = 0;
     if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
-        /* Assume everything is allocated.  */
-        *pnum = nb_sectors;
-        return ret;
+        s->skip_fiemap = true;
+        return -errno;
     }
 
     if (f.fm.fm_mapped_extents == 0) {
@@ -1326,44 +1305,92 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
          * f.fm.fm_start + f.fm.fm_length must be clamped to the file size!
          */
         off_t length = lseek(s->fd, 0, SEEK_END);
-        hole = f.fm.fm_start;
-        data = MIN(f.fm.fm_start + f.fm.fm_length, length);
+        *hole = f.fm.fm_start;
+        *data = MIN(f.fm.fm_start + f.fm.fm_length, length);
     } else {
-        data = f.fe.fe_logical;
-        hole = f.fe.fe_logical + f.fe.fe_length;
+        *data = f.fe.fe_logical;
+        *hole = f.fe.fe_logical + f.fe.fe_length;
         if (f.fe.fe_flags & FIEMAP_EXTENT_UNWRITTEN) {
             ret |= BDRV_BLOCK_ZERO;
         }
     }
 
-#elif defined SEEK_HOLE && defined SEEK_DATA
+    return ret;
+#else
+    return -ENOTSUP;
+#endif
+}
 
+static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
+                             off_t *hole, int *pnum)
+{
+#if defined SEEK_HOLE && defined SEEK_DATA
     BDRVRawState *s = bs->opaque;
 
-    hole = lseek(s->fd, start, SEEK_HOLE);
-    if (hole == -1) {
+    *hole = lseek(s->fd, start, SEEK_HOLE);
+    if (*hole == -1) {
         /* -ENXIO indicates that sector_num was past the end of the file.
          * There is a virtual hole there.  */
         assert(errno != -ENXIO);
 
-        /* Most likely EINVAL.  Assume everything is allocated.  */
-        *pnum = nb_sectors;
-        return ret;
+        return -errno;
     }
 
-    if (hole > start) {
-        data = start;
+    if (*hole > start) {
+        *data = start;
     } else {
         /* On a hole.  We need another syscall to find its end.  */
-        data = lseek(s->fd, start, SEEK_DATA);
-        if (data == -1) {
-            data = lseek(s->fd, 0, SEEK_END);
+        *data = lseek(s->fd, start, SEEK_DATA);
+        if (*data == -1) {
+            *data = lseek(s->fd, 0, SEEK_END);
         }
     }
+
+    return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
 #else
-    data = 0;
-    hole = start + nb_sectors * BDRV_SECTOR_SIZE;
+    return -ENOTSUP;
 #endif
+}
+
+/*
+ * Returns true iff the specified sector is present in the disk image. Drivers
+ * not implementing the functionality are assumed to not support backing files,
+ * hence all their sectors are reported as allocated.
+ *
+ * If 'sector_num' is beyond the end of the disk image the return value is 0
+ * and 'pnum' is set to 0.
+ *
+ * 'pnum' is set to the number of sectors (including and immediately following
+ * the specified sector) that are known to be in the same
+ * allocated/unallocated state.
+ *
+ * 'nb_sectors' is the max value 'pnum' should be set to.  If nb_sectors goes
+ * beyond the end of the disk image it will be clamped.
+ */
+static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
+                                                    int64_t sector_num,
+                                                    int nb_sectors, int *pnum)
+{
+    off_t start, data = 0, hole = 0;
+    int64_t ret;
+
+    ret = fd_open(bs);
+    if (ret < 0) {
+        return ret;
+    }
+
+    start = sector_num * BDRV_SECTOR_SIZE;
+
+    ret = try_fiemap(bs, start, &data, &hole, nb_sectors, pnum);
+    if (ret < 0) {
+        ret = try_seek_hole(bs, start, &data, &hole, pnum);
+        if (ret < 0) {
+            /* Assume everything is allocated. */
+            data = 0;
+            hole = start + nb_sectors * BDRV_SECTOR_SIZE;
+            ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
+        }
+    }
 
     if (data <= start) {
         /* On a data extent, compute sectors to the end of the extent.  */
diff --git a/block/vmdk.c b/block/vmdk.c
index 06a1f9f93..480ea37d7 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1496,6 +1496,19 @@ static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num,
     return ret;
 }
 
+static int vmdk_write_compressed(BlockDriverState *bs,
+                                 int64_t sector_num,
+                                 const uint8_t *buf,
+                                 int nb_sectors)
+{
+    BDRVVmdkState *s = bs->opaque;
+    if (s->num_extents == 1 && s->extents[0].compressed) {
+        return vmdk_write(bs, sector_num, buf, nb_sectors, false, false);
+    } else {
+        return -ENOTSUP;
+    }
+}
+
 static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs,
                                              int64_t sector_num,
                                              int nb_sectors,
@@ -2063,6 +2076,26 @@ static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)
     return spec_info;
 }
 
+static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+    int i;
+    BDRVVmdkState *s = bs->opaque;
+    assert(s->num_extents);
+    bdi->needs_compressed_writes = s->extents[0].compressed;
+    if (!s->extents[0].flat) {
+        bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
+    }
+    /* See if we have multiple extents but they have different cases */
+    for (i = 1; i < s->num_extents; i++) {
+        if (bdi->needs_compressed_writes != s->extents[i].compressed ||
+            (bdi->cluster_size && bdi->cluster_size !=
+                s->extents[i].cluster_sectors << BDRV_SECTOR_BITS)) {
+            return -ENOTSUP;
+        }
+    }
+    return 0;
+}
+
 static QEMUOptionParameter vmdk_create_options[] = {
     {
         .name = BLOCK_OPT_SIZE,
@@ -2109,6 +2142,7 @@ static BlockDriver bdrv_vmdk = {
     .bdrv_reopen_prepare          = vmdk_reopen_prepare,
     .bdrv_read                    = vmdk_co_read,
     .bdrv_write                   = vmdk_co_write,
+    .bdrv_write_compressed        = vmdk_write_compressed,
     .bdrv_co_write_zeroes         = vmdk_co_write_zeroes,
     .bdrv_close                   = vmdk_close,
     .bdrv_create                  = vmdk_create,
@@ -2118,6 +2152,7 @@ static BlockDriver bdrv_vmdk = {
     .bdrv_has_zero_init           = vmdk_has_zero_init,
     .bdrv_get_specific_info       = vmdk_get_specific_info,
     .bdrv_refresh_limits          = vmdk_refresh_limits,
+    .bdrv_get_info                = vmdk_get_info,
 
     .create_options               = vmdk_create_options,
 };
diff --git a/configure b/configure
index 46bc0c91f..3c11dd00d 100755
--- a/configure
+++ b/configure
@@ -4771,6 +4771,12 @@ if test "$gcov" = "yes" ; then
   echo "GCOV=$gcov_tool" >> $config_host_mak
 fi
 
+iotests_common_env="tests/qemu-iotests/common.env"
+
+echo "# Automatically generated by configure - do not modify" > $iotests_common_env
+echo >> $iotests_common_env
+echo "PYTHON='$python'" >> $iotests_common_env
+
 # use included Linux headers
 if test "$linux" = "yes" ; then
   mkdir -p linux-headers
diff --git a/include/block/block.h b/include/block/block.h
index 467fb2ba0..1b119aac2 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -34,6 +34,10 @@ typedef struct BlockDriverInfo {
      * opened with BDRV_O_UNMAP flag for this to work.
      */
     bool can_write_zeroes_with_unmap;
+    /*
+     * True if this block driver only supports compressed writes
+     */
+    bool needs_compressed_writes;
 } BlockDriverInfo;
 
 typedef struct BlockFragInfo {
@@ -191,7 +195,7 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
                     QDict *options, const char *bdref_key, int flags,
                     bool allow_none, Error **errp);
 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
-void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp);
+void bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp);
 int bdrv_open(BlockDriverState **pbs, const char *filename,
               const char *reference, QDict *options, int flags,
               BlockDriver *drv, Error **errp);
diff --git a/include/glib-compat.h b/include/glib-compat.h
index 8d2590070..1280fb2c1 100644
--- a/include/glib-compat.h
+++ b/include/glib-compat.h
@@ -24,7 +24,14 @@ static inline guint g_timeout_add_seconds(guint interval, GSourceFunc function,
 }
 #endif
 
-#if !GLIB_CHECK_VERSION(2, 20, 0)
+#ifdef _WIN32
+/*
+ * g_poll has a problem on Windows when using
+ * timeouts < 10ms, so use wrapper.
+ */
+#define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
+gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
+#elif !GLIB_CHECK_VERSION(2, 20, 0)
 /*
  * Glib before 2.20.0 doesn't implement g_poll, so wrap it to compile properly
  * on older systems.
diff --git a/qemu-img.c b/qemu-img.c
index 96f44638b..04ce02aeb 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -32,6 +32,7 @@
 #include "block/block_int.h"
 #include "block/qapi.h"
 #include <getopt.h>
+#include <glib.h>
 
 #define QEMU_IMG_VERSION "qemu-img version " QEMU_VERSION \
                           ", Copyright (c) 2004-2008 Fabrice Bellard\n"
@@ -55,9 +56,25 @@ typedef enum OutputFormat {
 #define BDRV_O_FLAGS BDRV_O_CACHE_WB
 #define BDRV_DEFAULT_CACHE "writeback"
 
-static void format_print(void *opaque, const char *name)
+static gint compare_data(gconstpointer a, gconstpointer b, gpointer user)
 {
-    printf(" %s", name);
+    return g_strcmp0(a, b);
+}
+
+static void print_format(gpointer data, gpointer user)
+{
+    printf(" %s", (char *)data);
+}
+
+static void add_format_to_seq(void *opaque, const char *fmt_name)
+{
+    GSequence *seq = opaque;
+
+    if (!g_sequence_lookup(seq, (gpointer)fmt_name,
+                           compare_data, NULL)) {
+        g_sequence_insert_sorted(seq, (gpointer)fmt_name,
+                                 compare_data, NULL);
+    }
 }
 
 static void QEMU_NORETURN GCC_FMT_ATTR(1, 2) error_exit(const char *fmt, ...)
@@ -142,10 +159,15 @@ static void QEMU_NORETURN help(void)
            "  '-f' first image format\n"
            "  '-F' second image format\n"
            "  '-s' run in Strict mode - fail on different image size or sector allocation\n";
+    GSequence *seq;
 
     printf("%s\nSupported formats:", help_msg);
-    bdrv_iterate_format(format_print, NULL);
+    seq = g_sequence_new(NULL);
+    bdrv_iterate_format(add_format_to_seq, seq);
+    g_sequence_foreach(seq, print_format, NULL);
     printf("\n");
+    g_sequence_free(seq);
+
     exit(EXIT_SUCCESS);
 }
 
@@ -1480,6 +1502,7 @@ static int img_convert(int argc, char **argv)
             goto out;
         }
     } else {
+        compress = compress || bdi.needs_compressed_writes;
         cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
     }
 
diff --git a/qemu-timer.c b/qemu-timer.c
index 9be1a4131..00a5d35c3 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -126,6 +126,9 @@ static void qemu_clock_init(QEMUClockType type)
 {
     QEMUClock *clock = qemu_clock_ptr(type);
 
+    /* Assert that the clock of type TYPE has not been initialized yet. */
+    assert(main_loop_tlg.tl[type] == NULL);
+
     clock->type = type;
     clock->enabled = true;
     clock->last = INT64_MIN;
diff --git a/tests/qemu-iotests/031 b/tests/qemu-iotests/031
index 1d920ea87..5aefb88b6 100755
--- a/tests/qemu-iotests/031
+++ b/tests/qemu-iotests/031
@@ -35,6 +35,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 . ./common.pattern
@@ -56,22 +57,22 @@ for IMGOPTS in "compat=0.10" "compat=1.1"; do
     echo === Create image with unknown header extension ===
     echo
     _make_test_img 64M
-    ./qcow2.py "$TEST_IMG" add-header-ext 0x12345678 "This is a test header extension"
-    ./qcow2.py "$TEST_IMG" dump-header
+    $PYTHON qcow2.py "$TEST_IMG" add-header-ext 0x12345678 "This is a test header extension"
+    $PYTHON qcow2.py "$TEST_IMG" dump-header
     _check_test_img
 
     echo
     echo === Rewrite header with no backing file ===
     echo
     $QEMU_IMG rebase -u -b "" "$TEST_IMG"
-    ./qcow2.py "$TEST_IMG" dump-header
+    $PYTHON qcow2.py "$TEST_IMG" dump-header
     _check_test_img
 
     echo
     echo === Add a backing file and format ===
     echo
     $QEMU_IMG rebase -u -b "/some/backing/file/path" -F host_device "$TEST_IMG"
-    ./qcow2.py "$TEST_IMG" dump-header
+    $PYTHON qcow2.py "$TEST_IMG" dump-header
 done
 
 # success, all done
diff --git a/tests/qemu-iotests/036 b/tests/qemu-iotests/036
index 03b6aa9de..29c35d100 100755
--- a/tests/qemu-iotests/036
+++ b/tests/qemu-iotests/036
@@ -38,6 +38,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 . ./common.pattern
@@ -53,15 +54,15 @@ IMGOPTS="compat=1.1"
 echo === Create image with unknown autoclear feature bit ===
 echo
 _make_test_img 64M
-./qcow2.py "$TEST_IMG" set-feature-bit autoclear 63
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" set-feature-bit autoclear 63
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 
 echo
 echo === Repair image ===
 echo
 _check_test_img -r all
 
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 
 # success, all done
 echo "*** done"
diff --git a/tests/qemu-iotests/039 b/tests/qemu-iotests/039
index b9cbe9956..b7b70300f 100755
--- a/tests/qemu-iotests/039
+++ b/tests/qemu-iotests/039
@@ -38,6 +38,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 
@@ -58,7 +59,7 @@ _make_test_img $size
 $QEMU_IO -c "write -P 0x5a 0 512" "$TEST_IMG" | _filter_qemu_io
 
 # The dirty bit must not be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 _check_test_img
 
 echo
@@ -73,7 +74,7 @@ $QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG" | _filter_qemu_io
 ulimit -c "$old_ulimit"
 
 # The dirty bit must be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 _check_test_img
 
 echo
@@ -82,7 +83,7 @@ echo "== Read-only access must still work =="
 $QEMU_IO -r -c "read -P 0x5a 0 512" "$TEST_IMG" | _filter_qemu_io
 
 # The dirty bit must be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 echo
 echo "== Repairing the image file must succeed =="
@@ -90,7 +91,7 @@ echo "== Repairing the image file must succeed =="
 _check_test_img -r all
 
 # The dirty bit must not be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 echo
 echo "== Data should still be accessible after repair =="
@@ -109,12 +110,12 @@ $QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG" | _filter_qemu_io
 ulimit -c "$old_ulimit"
 
 # The dirty bit must be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 $QEMU_IO -c "write 0 512" "$TEST_IMG" | _filter_qemu_io
 
 # The dirty bit must not be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 echo
 echo "== Creating an image file with lazy_refcounts=off =="
@@ -128,7 +129,7 @@ $QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG" | _filter_qemu_io
 ulimit -c "$old_ulimit"
 
 # The dirty bit must not be set since lazy_refcounts=off
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 _check_test_img
 
 echo
@@ -144,8 +145,8 @@ $QEMU_IO -c "write 0 512" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IMG commit "$TEST_IMG"
 
 # The dirty bit must not be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
-./qcow2.py "$TEST_IMG".base dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG".base dump-header | grep incompatible_features
 
 _check_test_img
 TEST_IMG="$TEST_IMG".base _check_test_img
diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index 073dc7a2d..c4af131a6 100755
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -233,6 +233,10 @@ echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="$TEST_IMG",
 
 $QEMU_IO -c "read -P 0x22 0 4k" "$TEST_IMG" | _filter_qemu_io
 
+echo -e 'qemu-io ide0-hd0 "write -P 0x33 0 4k"\ncommit ide0-hd0' | run_qemu -drive file="$TEST_IMG",snapshot=on | _filter_qemu_io
+
+$QEMU_IO -c "read -P 0x33 0 4k" "$TEST_IMG" | _filter_qemu_io
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 01b038447..31e329e89 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -358,4 +358,14 @@ wrote 4096/4096 bytes at offset 0
 
 read 4096/4096 bytes at offset 0
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Testing: -drive file=TEST_DIR/t.qcow2,snapshot=on
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qqeqemqemuqemu-qemu-iqemu-ioqemu-io qemu-io iqemu-io idqemu-io ideqemu-io ide0qemu-io ide0-qemu-io ide0-hqemu-io ide0-hdqemu-io ide0-hd0qemu-io ide0-hd0 qemu-io ide0-hd0 "qemu-io ide0-hd0 "wqemu-io ide0-hd0 "wrqemu-io ide0-hd0 "wriqemu-io ide0-hd0 "writqemu-io ide0-hd0 "writeqemu-io ide0-hd0 "write qemu-io ide0-hd0 "write -qemu-io ide0-hd0 "write -Pqemu-io ide0-hd0 "write -P qemu-io ide0-hd0 "write -P 0qemu-io ide0-hd0 "write -P 0xqemu-io ide0-hd0 "write -P 0x3qemu-io ide0-hd0 "write -P 0x33qemu-io ide0-hd0 "write -P 0x33 qemu-io ide0-hd0 "write -P 0x33 0qemu-io ide0-hd0 "write -P 0x33 0 qemu-io ide0-hd0 "write -P 0x33 0 4qemu-io ide0-hd0 "write -P 0x33 0 4kqemu-io ide0-hd0 "write -P 0x33 0 4k"
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+(qemu) ccocomcommcommicommitcommit commit icommit idcommit idecommit ide0commit ide0-commit ide0-hcommit ide0-hdcommit ide0-hd0
+(qemu) qququiquit
+
+read 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 *** done
diff --git a/tests/qemu-iotests/054 b/tests/qemu-iotests/054
index c8b7082b4..a5ebf9945 100755
--- a/tests/qemu-iotests/054
+++ b/tests/qemu-iotests/054
@@ -35,6 +35,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 
@@ -49,7 +50,7 @@ _make_test_img $((1024*1024))T
 echo
 echo "creating too large image (1 EB) using qcow2.py"
 _make_test_img 4G
-./qcow2.py "$TEST_IMG" set-header size $((1024 ** 6))
+$PYTHON qcow2.py "$TEST_IMG" set-header size $((1024 ** 6))
 _check_test_img
 
 # success, all done
diff --git a/tests/qemu-iotests/059 b/tests/qemu-iotests/059
index ca5aa16ff..26a2fd3e0 100755
--- a/tests/qemu-iotests/059
+++ b/tests/qemu-iotests/059
@@ -104,6 +104,13 @@ truncate -s 10M $TEST_IMG
 _img_info
 
 echo
+echo "=== Converting to streamOptimized from image with small cluster size==="
+TEST_IMG="$TEST_IMG.qcow2" IMGFMT=qcow2 IMGOPTS="cluster_size=4096" _make_test_img 1G
+$QEMU_IO -c "write -P 0xa 0 512" "$TEST_IMG.qcow2" | _filter_qemu_io
+$QEMU_IO -c "write -P 0xb 10240 512" "$TEST_IMG.qcow2" | _filter_qemu_io
+$QEMU_IMG convert -f qcow2 -O vmdk -o subformat=streamOptimized "$TEST_IMG.qcow2" "$TEST_IMG" 2>&1
+
+echo
 echo "=== Testing version 3 ==="
 _use_sample_img iotest-version3.vmdk.bz2
 _img_info
diff --git a/tests/qemu-iotests/059.out b/tests/qemu-iotests/059.out
index 3371c867b..eba0dedda 100644
--- a/tests/qemu-iotests/059.out
+++ b/tests/qemu-iotests/059.out
@@ -2046,10 +2046,18 @@ RW 12582912 VMFS "dummy.IMGFMT" 1
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=107374182400
 qemu-img: Could not open 'TEST_DIR/t.IMGFMT': File truncated, expecting at least 13172736 bytes
 
+=== Converting to streamOptimized from image with small cluster size===
+Formatting 'TEST_DIR/t.vmdk.IMGFMT', fmt=IMGFMT size=1073741824
+wrote 512/512 bytes at offset 0
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 512/512 bytes at offset 10240
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
 === Testing version 3 ===
 image: TEST_DIR/iotest-version3.IMGFMT
 file format: IMGFMT
 virtual size: 1.0G (1073741824 bytes)
+cluster_size: 65536
 
 === Testing 4TB monolithicFlat creation and IO ===
 Formatting 'TEST_DIR/iotest-version3.IMGFMT', fmt=IMGFMT size=4398046511104
diff --git a/tests/qemu-iotests/060 b/tests/qemu-iotests/060
index f0116aab1..5447b27a1 100755
--- a/tests/qemu-iotests/060
+++ b/tests/qemu-iotests/060
@@ -35,6 +35,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 
@@ -68,13 +69,13 @@ poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x03\x00\x00"
 _check_test_img
 
 # The corrupt bit should not be set anyway
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 # Try to write something, thereby forcing the corrupt bit to be set
 $QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io
 
 # The corrupt bit must now be set
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 # Try to open the image R/W (which should fail)
 $QEMU_IO -c "$OPEN_RW" -c "read 0 512" 2>&1 | _filter_qemu_io \
@@ -99,19 +100,19 @@ poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01"
 # Redirect new data cluster onto refcount block
 poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x02\x00\x00"
 _check_test_img
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 $QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 # Try to fix it
 _check_test_img -r all
 
 # The corrupt bit should be cleared
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 # Look if it's really really fixed
 $QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 echo
 echo "=== Testing cluster data reference into inactive L2 table ==="
@@ -124,13 +125,13 @@ $QEMU_IO -c "$OPEN_RW" -c "write -P 2 0 512" | _filter_qemu_io
 poke_file "$TEST_IMG" "$l2_offset_after_snapshot" \
                       "\x80\x00\x00\x00\x00\x04\x00\x00"
 _check_test_img
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 $QEMU_IO -c "$OPEN_RW" -c "write -P 3 0 512" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 _check_test_img -r all
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 $QEMU_IO -c "$OPEN_RW" -c "write -P 4 0 512" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 
 # Check data
 $QEMU_IO -c "$OPEN_RO" -c "read -P 4 0 512" | _filter_qemu_io
diff --git a/tests/qemu-iotests/061 b/tests/qemu-iotests/061
index d3a6b388b..0de789734 100755
--- a/tests/qemu-iotests/061
+++ b/tests/qemu-iotests/061
@@ -35,6 +35,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 
@@ -48,9 +49,9 @@ echo "=== Testing version downgrade with zero expansion ==="
 echo
 IMGOPTS="compat=1.1,lazy_refcounts=on" _make_test_img 64M
 $QEMU_IO -c "write -z 0 128k" "$TEST_IMG" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IMG amend -o "compat=0.10" "$TEST_IMG"
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IO -c "read -P 0 0 128k" "$TEST_IMG" | _filter_qemu_io
 _check_test_img
 
@@ -59,9 +60,9 @@ echo "=== Testing dirty version downgrade ==="
 echo
 IMGOPTS="compat=1.1,lazy_refcounts=on" _make_test_img 64M
 $QEMU_IO -c "write -P 0x2a 0 128k" -c flush -c abort "$TEST_IMG" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IMG amend -o "compat=0.10" "$TEST_IMG"
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IO -c "read -P 0x2a 0 128k" "$TEST_IMG" | _filter_qemu_io
 _check_test_img
 
@@ -69,11 +70,11 @@ echo
 echo "=== Testing version downgrade with unknown compat/autoclear flags ==="
 echo
 IMGOPTS="compat=1.1" _make_test_img 64M
-./qcow2.py "$TEST_IMG" set-feature-bit compatible 42
-./qcow2.py "$TEST_IMG" set-feature-bit autoclear 42
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" set-feature-bit compatible 42
+$PYTHON qcow2.py "$TEST_IMG" set-feature-bit autoclear 42
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IMG amend -o "compat=0.10" "$TEST_IMG"
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 _check_test_img
 
 echo
@@ -81,9 +82,9 @@ echo "=== Testing version upgrade and resize ==="
 echo
 IMGOPTS="compat=0.10" _make_test_img 64M
 $QEMU_IO -c "write -P 0x2a 42M 64k" "$TEST_IMG" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IMG amend -o "compat=1.1,lazy_refcounts=on,size=128M" "$TEST_IMG"
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IO -c "read -P 0x2a 42M 64k" "$TEST_IMG" | _filter_qemu_io
 _check_test_img
 
@@ -92,9 +93,9 @@ echo "=== Testing dirty lazy_refcounts=off ==="
 echo
 IMGOPTS="compat=1.1,lazy_refcounts=on" _make_test_img 64M
 $QEMU_IO -c "write -P 0x2a 0 128k" -c flush -c abort "$TEST_IMG" | _filter_qemu_io
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IMG amend -o "lazy_refcounts=off" "$TEST_IMG"
-./qcow2.py "$TEST_IMG" dump-header
+$PYTHON qcow2.py "$TEST_IMG" dump-header
 $QEMU_IO -c "read -P 0x2a 0 128k" "$TEST_IMG" | _filter_qemu_io
 _check_test_img
 
diff --git a/tests/qemu-iotests/065 b/tests/qemu-iotests/065
index ab5445f62..e89b61d70 100755
--- a/tests/qemu-iotests/065
+++ b/tests/qemu-iotests/065
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Test for additional information emitted by qemu-img info on qcow2
 # images
diff --git a/tests/qemu-iotests/083 b/tests/qemu-iotests/083
index f76453478..6a52c96bb 100755
--- a/tests/qemu-iotests/083
+++ b/tests/qemu-iotests/083
@@ -29,6 +29,7 @@ tmp=/tmp/$$
 status=1	# failure is the default!
 
 # get standard environment, filters and checks
+. ./common.env
 . ./common.rc
 . ./common.filter
 
@@ -81,7 +82,7 @@ EOF
 		nbd_url="nbd:127.0.0.1:$port:exportname=foo"
 	fi
 
-	./nbd-fault-injector.py $extra_args "127.0.0.1:$port" "$TEST_DIR/nbd-fault-injector.conf" 2>&1 >/dev/null &
+	$PYTHON nbd-fault-injector.py $extra_args "127.0.0.1:$port" "$TEST_DIR/nbd-fault-injector.conf" 2>&1 >/dev/null &
 	wait_for_tcp_port "127.0.0.1:$port"
 	$QEMU_IO -c "read 0 512" "$nbd_url" 2>&1 | _filter_qemu_io | filter_nbd
 
diff --git a/tests/qemu-iotests/085 b/tests/qemu-iotests/085
index 33c8dc410..56cd6f89b 100755
--- a/tests/qemu-iotests/085
+++ b/tests/qemu-iotests/085
@@ -30,10 +30,6 @@ echo "QA output created by $seq"
 
 here=`pwd`
 status=1	# failure is the default!
-qemu_pid=
-
-QMP_IN="${TEST_DIR}/qmp-in-$$"
-QMP_OUT="${TEST_DIR}/qmp-out-$$"
 
 snapshot_virt0="snapshot-v0.qcow2"
 snapshot_virt1="snapshot-v1.qcow2"
@@ -42,10 +38,7 @@ MAX_SNAPSHOTS=10
 
 _cleanup()
 {
-    kill -KILL ${qemu_pid}
-    wait ${qemu_pid} 2>/dev/null  # silent kill
-
-    rm -f "${QMP_IN}" "${QMP_OUT}"
+    _cleanup_qemu
     for i in $(seq 1 ${MAX_SNAPSHOTS})
     do
         rm -f "${TEST_DIR}/${i}-${snapshot_virt0}"
@@ -59,43 +52,12 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 # get standard environment, filters and checks
 . ./common.rc
 . ./common.filter
+. ./common.qemu
 
 _supported_fmt qcow2
 _supported_proto file
 _supported_os Linux
 
-# Wait for expected QMP response from QEMU.  Will time out
-# after 10 seconds, which counts as failure.
-#
-# $1 is the string to expect
-#
-# If $silent is set to anything but an empty string, then
-# response is not echoed out.
-function timed_wait_for()
-{
-    while read -t 10 resp <&5
-    do
-        if [ "${silent}" == "" ]; then
-            echo "${resp}" | _filter_testdir | _filter_qemu
-        fi
-        grep -q "${1}" < <(echo ${resp})
-        if [ $? -eq 0 ]; then
-            return
-        fi
-    done
-    echo "Timeout waiting for ${1}"
-    exit 1  # Timeout means the test failed
-}
-
-# Sends QMP command to QEMU, and waits for the expected response
-#
-# ${1}:  String of the QMP command to send
-# ${2}:  String that the QEMU response should contain
-function send_qmp_cmd()
-{
-    echo "${1}" >&6
-    timed_wait_for "${2}"
-}
 
 # ${1}: unique identifier for the snapshot filename
 function create_single_snapshot()
@@ -104,7 +66,7 @@ function create_single_snapshot()
                       'arguments': { 'device': 'virtio0',
                                      'snapshot-file':'"${TEST_DIR}/${1}-${snapshot_virt0}"',
                                      'format': 'qcow2' } }"
-    send_qmp_cmd "${cmd}" "return"
+    _send_qemu_cmd $h "${cmd}" "return"
 }
 
 # ${1}: unique identifier for the snapshot filename
@@ -120,14 +82,11 @@ function create_group_snapshot()
                        'snapshot-file': '"${TEST_DIR}/${1}-${snapshot_virt1}"' } } ]
              } }"
 
-    send_qmp_cmd "${cmd}" "return"
+    _send_qemu_cmd $h "${cmd}" "return"
 }
 
 size=128M
 
-mkfifo "${QMP_IN}"
-mkfifo "${QMP_OUT}"
-
 _make_test_img $size
 mv "${TEST_IMG}" "${TEST_IMG}.orig"
 _make_test_img $size
@@ -136,23 +95,15 @@ echo
 echo === Running QEMU ===
 echo
 
-"${QEMU}" -nographic -monitor none -serial none -qmp stdio\
-          -drive file="${TEST_IMG}.orig",if=virtio\
-          -drive file="${TEST_IMG}",if=virtio 2>&1 >"${QMP_OUT}" <"${QMP_IN}"&
-qemu_pid=$!
-
-# redirect fifos to file descriptors, to keep from blocking
-exec 5<"${QMP_OUT}"
-exec 6>"${QMP_IN}"
-
-# Don't print response, since it has version information in it
-silent=yes timed_wait_for "capabilities"
+qemu_comm_method="qmp"
+_launch_qemu -drive file="${TEST_IMG}.orig",if=virtio -drive file="${TEST_IMG}",if=virtio
+h=$QEMU_HANDLE
 
 echo
 echo === Sending capabilities ===
 echo
 
-send_qmp_cmd "{ 'execute': 'qmp_capabilities' }" "return"
+_send_qemu_cmd $h "{ 'execute': 'qmp_capabilities' }" "return"
 
 echo
 echo === Create a single snapshot on virtio0 ===
@@ -165,16 +116,16 @@ echo
 echo === Invalid command - missing device and nodename ===
 echo
 
-send_qmp_cmd "{ 'execute': 'blockdev-snapshot-sync',
-                      'arguments': { 'snapshot-file':'"${TEST_DIR}"/1-${snapshot_virt0}',
+_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot-sync',
+                         'arguments': { 'snapshot-file':'"${TEST_DIR}/1-${snapshot_virt0}"',
                                      'format': 'qcow2' } }" "error"
 
 echo
 echo === Invalid command - missing snapshot-file ===
 echo
 
-send_qmp_cmd "{ 'execute': 'blockdev-snapshot-sync',
-                      'arguments': { 'device': 'virtio0',
+_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot-sync',
+                         'arguments': { 'device': 'virtio0',
                                      'format': 'qcow2' } }" "error"
 echo
 echo
diff --git a/tests/qemu-iotests/091 b/tests/qemu-iotests/091
new file mode 100755
index 000000000..384b3ace5
--- /dev/null
+++ b/tests/qemu-iotests/091
@@ -0,0 +1,105 @@
+#!/bin/bash
+#
+# Live migration test
+#
+# Performs a migration from one VM to another via monitor commands
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=jcody@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+status=1    # failure is the default!
+
+MIG_FIFO="${TEST_DIR}/migrate"
+
+_cleanup()
+{
+    rm -f "${MIG_FIFO}"
+    _cleanup_qemu
+    _cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.qemu
+
+_supported_fmt qcow2
+_supported_proto file
+_supported_os Linux
+
+size=1G
+
+_make_test_img $size
+
+mkfifo "${MIG_FIFO}"
+
+echo
+echo === Starting QEMU VM1 ===
+echo
+
+qemu_comm_method="monitor"
+_launch_qemu -drive file="${TEST_IMG}",cache=none,id=disk
+h1=$QEMU_HANDLE
+
+echo
+echo === Starting QEMU VM2 ===
+echo
+_launch_qemu -drive file="${TEST_IMG}",cache=none,id=disk \
+             -incoming "exec: cat '${MIG_FIFO}'"
+h2=$QEMU_HANDLE
+
+echo
+echo === VM 1: Migrate from VM1 to VM2  ===
+echo
+
+silent=yes
+_send_qemu_cmd $h1 'qemu-io disk "write -P 0x22 0 4M"' "(qemu)"
+echo "vm1: qemu-io disk write complete"
+_send_qemu_cmd $h1 "migrate \"exec: cat > '${MIG_FIFO}'\"" "(qemu)"
+echo "vm1: live migration started"
+qemu_cmd_repeat=20 _send_qemu_cmd $h1 "info migrate" "completed"
+echo "vm1: live migration completed"
+
+echo
+echo === VM 2: Post-migration, write to disk, verify running ===
+echo
+
+_send_qemu_cmd $h2 'qemu-io disk "write 4M 1M"' "(qemu)"
+echo "vm2: qemu-io disk write complete"
+qemu_cmd_repeat=20 _send_qemu_cmd $h2 "info status" "running"
+echo "vm2: qemu process running successfully"
+
+echo "vm2: flush io, and quit"
+_send_qemu_cmd $h2 'qemu-io disk flush' "(qemu)"
+_send_qemu_cmd $h2 'quit' ""
+
+echo "Check image pattern"
+${QEMU_IO} -c "read -P 0x22 0 4M" "${TEST_IMG}" | _filter_testdir | _filter_qemu_io
+
+echo "Running 'qemu-img check -r all \$TEST_IMG'"
+"${QEMU_IMG}" check -r all "${TEST_IMG}" 2>&1 | _filter_testdir | _filter_qemu
+
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/091.out b/tests/qemu-iotests/091.out
new file mode 100644
index 000000000..a2e012296
--- /dev/null
+++ b/tests/qemu-iotests/091.out
@@ -0,0 +1,28 @@
+QA output created by 091
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
+
+=== Starting QEMU VM1 ===
+
+
+=== Starting QEMU VM2 ===
+
+
+=== VM 1: Migrate from VM1 to VM2 ===
+
+vm1: qemu-io disk write complete
+vm1: live migration started
+vm1: live migration completed
+
+=== VM 2: Post-migration, write to disk, verify running ===
+
+vm2: qemu-io disk write complete
+vm2: qemu process running successfully
+vm2: flush io, and quit
+Check image pattern
+read 4194304/4194304 bytes at offset 0
+4 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Running 'qemu-img check -r all $TEST_IMG'
+No errors were found on the image.
+80/16384 = 0.49% allocated, 0.00% fragmented, 0.00% compressed clusters
+Image end offset: 5570560
+*** done
diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index e2ed5a95f..ca2ee43d3 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -34,6 +34,13 @@ timestamp=${TIMESTAMP:=false}
 # generic initialization
 iam=check
 
+# we need common.env
+if ! . ./common.env
+then
+    echo "$iam: failed to source common.env"
+    exit 1
+fi
+
 # we need common.config
 if ! . ./common.config
 then
@@ -215,9 +222,16 @@ do
 
         start=`_wallclock`
         $timestamp && echo -n "        ["`date "+%T"`"]"
-        [ ! -x $seq ] && chmod u+x $seq # ensure we can run it
+
+        if [ "$(head -n 1 $seq)" == "#!/usr/bin/env python" ]; then
+            run_command="$PYTHON $seq"
+        else
+            [ ! -x $seq ] && chmod u+x $seq # ensure we can run it
+            run_command="./$seq"
+        fi
+
         MALLOC_PERTURB_=${MALLOC_PERTURB_:-$(($RANDOM % 255 + 1))} \
-                ./$seq >$tmp.out 2>&1
+                $run_command >$tmp.out 2>&1
         sts=$?
         $timestamp && _timestamp
         stop=`_wallclock`
diff --git a/tests/qemu-iotests/common.qemu b/tests/qemu-iotests/common.qemu
new file mode 100644
index 000000000..918af3102
--- /dev/null
+++ b/tests/qemu-iotests/common.qemu
@@ -0,0 +1,200 @@
+#!/bin/bash
+#
+# This allows for launching of multiple QEMU instances, with independent
+# communication possible to each instance.
+#
+# Each instance can choose, at launch, to use either the QMP or the
+# HMP (monitor) interface.
+#
+# All instances are cleaned up via _cleanup_qemu, including killing the
+# running qemu instance.
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+QEMU_COMM_TIMEOUT=10
+
+QEMU_FIFO_IN="${TEST_DIR}/qmp-in-$$"
+QEMU_FIFO_OUT="${TEST_DIR}/qmp-out-$$"
+
+QEMU_PID=
+_QEMU_HANDLE=0
+QEMU_HANDLE=0
+
+# If bash version is >= 4.1, these will be overwritten and dynamic
+# file descriptor values assigned.
+_out_fd=3
+_in_fd=4
+
+# Wait for expected QMP response from QEMU.  Will time out
+# after 10 seconds, which counts as failure.
+#
+# Override QEMU_COMM_TIMEOUT for a timeout different than the
+# default 10 seconds
+#
+# $1: The handle to use
+# $2+ All remaining arguments comprise the string to search for
+#    in the response.
+#
+# If $silent is set to anything but an empty string, then
+# response is not echoed out.
+function _timed_wait_for()
+{
+    local h=${1}
+    shift
+
+    QEMU_STATUS[$h]=0
+    while read -t ${QEMU_COMM_TIMEOUT} resp <&${QEMU_OUT[$h]}
+    do
+        if [ -z "${silent}" ]; then
+            echo "${resp}" | _filter_testdir | _filter_qemu \
+                           | _filter_qemu_io | _filter_qmp
+        fi
+        grep -q "${*}" < <(echo ${resp})
+        if [ $? -eq 0 ]; then
+            return
+        fi
+    done
+    QEMU_STATUS[$h]=-1
+    if [ -z "${qemu_error_no_exit}" ]; then
+        echo "Timeout waiting for ${*} on handle ${h}"
+        exit 1  # Timeout means the test failed
+    fi
+}
+
+
+# Sends QMP or HMP command to QEMU, and waits for the expected response
+#
+# $1:       QEMU handle to use
+# $2:       String of the QMP command to send
+# ${@: -1}  (Last string passed)
+#             String that the QEMU response should contain. If it is a null
+#             string, do not wait for a response
+#
+# Set qemu_cmd_repeat to the number of times to repeat the cmd
+# until either timeout, or a response.  If it is not set, or <=0,
+# then the command is only sent once.
+#
+# If $qemu_error_no_exit is set, then even if the expected response
+# is not seen, we will not exit.  $QEMU_STATUS[$1] will be set it -1 in
+# that case.
+function _send_qemu_cmd()
+{
+    local h=${1}
+    local count=1
+    local cmd=
+    local use_error=${qemu_error_no_exit}
+    shift
+
+    if [ ${qemu_cmd_repeat} -gt 0 ] 2>/dev/null; then
+        count=${qemu_cmd_repeat}
+        use_error="no"
+    fi
+    # This array element extraction is done to accomodate pathnames with spaces
+    cmd=${@: 1:${#@}-1}
+    shift $(($# - 1))
+
+    while [ ${count} -gt 0 ]
+    do
+        echo "${cmd}" >&${QEMU_IN[${h}]}
+        if [ -n "${1}" ]; then
+            qemu_error_no_exit=${use_error} _timed_wait_for ${h} "${1}"
+            if [ ${QEMU_STATUS[$h]} -eq 0 ]; then
+                return
+            fi
+        fi
+        let count--;
+    done
+    if [ ${QEMU_STATUS[$h]} -ne 0 ] && [ -z "${qemu_error_no_exit}" ]; then
+        echo "Timeout waiting for ${1} on handle ${h}"
+        exit 1 #Timeout means the test failed
+    fi
+}
+
+
+# Launch a QEMU process.
+#
+# Input parameters:
+# $qemu_comm_method: set this variable to 'monitor' (case insensitive)
+#                    to use the QEMU HMP monitor for communication.
+#                    Otherwise, the default of QMP is used.
+# Returns:
+# $QEMU_HANDLE: set to a handle value to communicate with this QEMU instance.
+#
+function _launch_qemu()
+{
+    local comm=
+    local fifo_out=
+    local fifo_in=
+
+    if (shopt -s nocasematch; [[ "${qemu_comm_method}" == "monitor" ]])
+    then
+        comm="-monitor stdio"
+    else
+        local qemu_comm_method="qmp"
+        comm="-monitor none -qmp stdio"
+    fi
+
+    fifo_out=${QEMU_FIFO_OUT}_${_QEMU_HANDLE}
+    fifo_in=${QEMU_FIFO_IN}_${_QEMU_HANDLE}
+    mkfifo "${fifo_out}"
+    mkfifo "${fifo_in}"
+
+    "${QEMU}" -nographic -serial none ${comm} -machine accel=qtest "${@}" 2>&1 \
+                                                                >"${fifo_out}" \
+                                                                <"${fifo_in}" &
+    QEMU_PID[${_QEMU_HANDLE}]=$!
+
+    if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
+        ("${BASH_VERSINFO[0]}" -ge "4"  &&  "${BASH_VERSINFO[1]}" -ge "1") ]]
+    then
+        # bash >= 4.1 required for automatic fd
+        exec {_out_fd}<"${fifo_out}"
+        exec {_in_fd}>"${fifo_in}"
+    else
+        let _out_fd++
+        let _in_fd++
+        eval "exec ${_out_fd}<'${fifo_out}'"
+        eval "exec ${_in_fd}>'${fifo_in}'"
+    fi
+
+    QEMU_OUT[${_QEMU_HANDLE}]=${_out_fd}
+    QEMU_IN[${_QEMU_HANDLE}]=${_in_fd}
+    QEMU_STATUS[${_QEMU_HANDLE}]=0
+
+    if [ "${qemu_comm_method}" == "qmp" ]
+    then
+        # Don't print response, since it has version information in it
+        silent=yes _timed_wait_for ${_QEMU_HANDLE} "capabilities"
+    fi
+    QEMU_HANDLE=${_QEMU_HANDLE}
+    let _QEMU_HANDLE++
+}
+
+
+# Silenty kills the QEMU process
+function _cleanup_qemu()
+{
+    # QEMU_PID[], QEMU_IN[], QEMU_OUT[] all use same indices
+    for i in "${!QEMU_OUT[@]}"
+    do
+        kill -KILL ${QEMU_PID[$i]} 2>/dev/null
+        wait ${QEMU_PID[$i]} 2>/dev/null # silent kill
+        rm -f "${QEMU_FIFO_IN}_${i}" "${QEMU_FIFO_OUT}_${i}"
+        eval "exec ${QEMU_IN[$i]}<&-"   # close file descriptors
+        eval "exec ${QEMU_OUT[$i]}<&-"
+    done
+}
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index ae096638b..cd3e4d2c2 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -96,3 +96,4 @@
 087 rw auto
 088 rw auto
 090 rw auto quick
+091 rw auto
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 93f7d351d..69552f7ec 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -238,3 +238,115 @@ char *qemu_get_exec_dir(void)
 {
     return g_strdup(exec_dir);
 }
+
+/*
+ * g_poll has a problem on Windows when using
+ * timeouts < 10ms, in glib/gpoll.c:
+ *
+ * // If not, and we have a significant timeout, poll again with
+ * // timeout then. Note that this will return indication for only
+ * // one event, or only for messages. We ignore timeouts less than
+ * // ten milliseconds as they are mostly pointless on Windows, the
+ * // MsgWaitForMultipleObjectsEx() call will timeout right away
+ * // anyway.
+ *
+ * if (retval == 0 && (timeout == INFINITE || timeout >= 10))
+ *   retval = poll_rest (poll_msgs, handles, nhandles, fds, nfds, timeout);
+ *
+ * So whenever g_poll is called with timeout < 10ms it does
+ * a quick poll instead of wait, this causes significant performance
+ * degradation of QEMU, thus we should use WaitForMultipleObjectsEx
+ * directly
+ */
+gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout)
+{
+    guint i;
+    HANDLE handles[MAXIMUM_WAIT_OBJECTS];
+    gint nhandles = 0;
+    int num_completed = 0;
+
+    for (i = 0; i < nfds; i++) {
+        gint j;
+
+        if (fds[i].fd <= 0) {
+            continue;
+        }
+
+        /* don't add same handle several times
+         */
+        for (j = 0; j < nhandles; j++) {
+            if (handles[j] == (HANDLE)fds[i].fd) {
+                break;
+            }
+        }
+
+        if (j == nhandles) {
+            if (nhandles == MAXIMUM_WAIT_OBJECTS) {
+                fprintf(stderr, "Too many handles to wait for!\n");
+                break;
+            } else {
+                handles[nhandles++] = (HANDLE)fds[i].fd;
+            }
+        }
+    }
+
+    for (i = 0; i < nfds; ++i) {
+        fds[i].revents = 0;
+    }
+
+    if (timeout == -1) {
+        timeout = INFINITE;
+    }
+
+    if (nhandles == 0) {
+        if (timeout == INFINITE) {
+            return -1;
+        } else {
+            SleepEx(timeout, TRUE);
+            return 0;
+        }
+    }
+
+    while (1) {
+        DWORD res;
+        gint j;
+
+        res = WaitForMultipleObjectsEx(nhandles, handles, FALSE,
+            timeout, TRUE);
+
+        if (res == WAIT_FAILED) {
+            for (i = 0; i < nfds; ++i) {
+                fds[i].revents = 0;
+            }
+
+            return -1;
+        } else if ((res == WAIT_TIMEOUT) || (res == WAIT_IO_COMPLETION) ||
+                   ((int)res < (int)WAIT_OBJECT_0) ||
+                   (res >= (WAIT_OBJECT_0 + nhandles))) {
+            break;
+        }
+
+        for (i = 0; i < nfds; ++i) {
+            if (handles[res - WAIT_OBJECT_0] == (HANDLE)fds[i].fd) {
+                fds[i].revents = fds[i].events;
+            }
+        }
+
+        ++num_completed;
+
+        if (nhandles <= 1) {
+            break;
+        }
+
+        /* poll the rest of the handles
+         */
+        for (j = res - WAIT_OBJECT_0 + 1; j < nhandles; j++) {
+            handles[j - 1] = handles[j];
+        }
+        --nhandles;
+
+        timeout = 0;
+    }
+
+    return num_completed;
+}
diff --git a/vl.c b/vl.c
index 73e06610b..709d8cda8 100644
--- a/vl.c
+++ b/vl.c
@@ -3024,7 +3024,6 @@ int main(int argc, char **argv, char **envp)
 
     runstate_init();
 
-    init_clocks();
     rtc_clock = QEMU_CLOCK_HOST;
 
     qemu_init_auxval(envp);