q800: fix coverity warning CID 1412799

[mirror_qemu.git] / docs / replay.txt

diff --git a/docs/replay.txt b/docs/replay.txt
index 3497585f5a39b2592230a8a7896eab1f6eeff2f8..f4619a62a3d3ec31b3e5f1ddb5c565f5adbf8c6b 100644 (file)
--- a/docs/replay.txt
+++ b/docs/replay.txt
@@ -27,7 +27,7 @@ Usage of the record/replay:
  * First, record the execution with the following command line:
     qemu-system-i386 \
      -icount shift=7,rr=record,rrfile=replay.bin \
-     -drive file=disk.qcow2,if=none,id=img-direct \
+     -drive file=disk.qcow2,if=none,snapshot,id=img-direct \
      -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \
      -device ide-hd,drive=img-blkreplay \
      -netdev user,id=net1 -device rtl8139,netdev=net1 \
@@ -35,7 +35,7 @@ Usage of the record/replay:
  * After recording, you can replay it by using another command line:
     qemu-system-i386 \
      -icount shift=7,rr=replay,rrfile=replay.bin \
-     -drive file=disk.qcow2,if=none,id=img-direct \
+     -drive file=disk.qcow2,if=none,snapshot,id=img-direct \
      -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \
      -device ide-hd,drive=img-blkreplay \
      -netdev user,id=net1 -device rtl8139,netdev=net1 \
@@ -67,6 +67,7 @@ Modifications of qemu include:
  * network filter for recording and replaying the packets
  * block driver for making block layer deterministic
  * serial port input record and replay
+ * recording of random numbers obtained from the external sources
 
 Locking and thread synchronisation
 ----------------------------------
@@ -223,7 +224,7 @@ Block devices record/replay module intercepts calls of
 bdrv coroutine functions at the top of block drivers stack.
 To record and replay block operations the drive must be configured
 as following:
- -drive file=disk.qcow2,if=none,id=img-direct
+ -drive file=disk.qcow2,if=none,snapshot,id=img-direct
  -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay
  -device ide-hd,drive=img-blkreplay
 
@@ -252,6 +253,12 @@ This snapshot is created at start of recording and restored at start
 of replaying. It also can be loaded while replaying to roll back
 the execution.
 
+'snapshot' flag of the disk image must be removed to save the snapshots
+in the overlay (or original image) instead of using the temporary overlay.
+ -drive file=disk.ovl,if=none,id=img-direct
+ -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay
+ -device ide-hd,drive=img-blkreplay
+
 Use QEMU monitor to create additional snapshots. 'savevm <name>' command
 created the snapshot and 'loadvm <name>' restores it. To prevent corruption
 of the original disk image, use overlay files linked to the original images.
@@ -290,7 +297,7 @@ E.g., '-serial stdio' in record mode, and '-serial null' in replay mode.
 Replay log format
 -----------------
 
-Record/replay log consits of the header and the sequence of execution
+Record/replay log consists of the header and the sequence of execution
 events. The header includes 4-byte replay version id and 8-byte reserved
 field. Version is updated every time replay log format changes to prevent
 using replay log created by another build of qemu.