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[PULL 04/15] replay: update docs for record/replay with block devices
From: |
Kevin Wolf |
Subject: |
[PULL 04/15] replay: update docs for record/replay with block devices |
Date: |
Mon, 14 Oct 2019 18:03:38 +0200 |
From: Pavel Dovgalyuk <address@hidden>
This patch updates the description of the command lines for using
record/replay with attached block devices.
Signed-off-by: Pavel Dovgalyuk <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
docs/replay.txt | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/docs/replay.txt b/docs/replay.txt
index ee6aee9861..ce97c3f72f 100644
--- 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 \
@@ -223,7 +223,7 @@ 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 +252,12 @@ 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.
--
2.20.1
- [PULL 00/15] Block layer patches, Kevin Wolf, 2019/10/14
- [PULL 01/15] block/vhdx: add check for truncated image files, Kevin Wolf, 2019/10/14
- [PULL 02/15] block: implement bdrv_snapshot_goto for blkreplay, Kevin Wolf, 2019/10/14
- [PULL 03/15] replay: disable default snapshot for record/replay, Kevin Wolf, 2019/10/14
- [PULL 04/15] replay: update docs for record/replay with block devices,
Kevin Wolf <=
- [PULL 05/15] replay: don't drain/flush bdrv queue while RR is working, Kevin Wolf, 2019/10/14
- [PULL 06/15] replay: finish record/replay before closing the disks, Kevin Wolf, 2019/10/14
- [PULL 09/15] iotests/028: Fix for long $TEST_DIRs, Kevin Wolf, 2019/10/14
- [PULL 07/15] replay: add BH oneshot event for block layer, Kevin Wolf, 2019/10/14
- [PULL 08/15] block: Reject misaligned write requests with BDRV_REQ_NO_FALLBACK, Kevin Wolf, 2019/10/14
- Re: [PULL 00/15] Block layer patches, Peter Maydell, 2019/10/15