Merge remote-tracking branch 'quintela/migration-next-20120808' into staging

* quintela/migration-next-20120808:
  Restart optimization on stage3 update version
  Add XBZRLE statistics
  Add migration accounting for normal and duplicate pages
  Change total_time to total-time in MigrationStats
  Add migrate_set_cache_size command
  Add XBZRLE to ram_save_block and ram_save_live
  Add xbzrle_encode_buffer and xbzrle_decode_buffer functions
  Add uleb encoding/decoding functions
  Add cache handling functions
  Add XBZRLE documentation
  Add migrate-set-capabilities
  Add migration capabilities

1 files changed, 42 insertions, 0 deletions

diff --git a/cutils.c b/cutils.c
index 9d4c570939..ee4614d378 100644
--- a/cutils.c
+++ b/cutils.c
@@ -382,3 +382,45 @@ int qemu_parse_fd(const char *param)
     }
     return fd;
 }
+
+/* round down to the nearest power of 2*/
+int64_t pow2floor(int64_t value)
+{
+    if (!is_power_of_2(value)) {
+        value = 0x8000000000000000ULL >> clz64(value);
+    }
+    return value;
+}
+
+/*
+ * Implementation of  ULEB128 (http://en.wikipedia.org/wiki/LEB128)
+ * Input is limited to 14-bit numbers
+ */
+int uleb128_encode_small(uint8_t *out, uint32_t n)
+{
+    g_assert(n <= 0x3fff);
+    if (n < 0x80) {
+        *out++ = n;
+        return 1;
+    } else {
+        *out++ = (n & 0x7f) | 0x80;
+        *out++ = n >> 7;
+        return 2;
+    }
+}
+
+int uleb128_decode_small(const uint8_t *in, uint32_t *n)
+{
+    if (!(*in & 0x80)) {
+        *n = *in++;
+        return 1;
+    } else {
+        *n = *in++ & 0x7f;
+        /* we exceed 14 bit number */
+        if (*in & 0x80) {
+            return -1;
+        }
+        *n |= *in++ << 7;
+        return 2;
+    }
+}