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[Qemu-devel] [PATCH for-4.2 04/14] replay: update docs for record/replay
From: |
Pavel Dovgalyuk |
Subject: |
[Qemu-devel] [PATCH for-4.2 04/14] replay: update docs for record/replay with block devices |
Date: |
Wed, 24 Jul 2019 11:43:36 +0300 |
User-agent: |
StGit/0.17.1-dirty |
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>
---
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.
- [Qemu-devel] [PATCH for-4.2 00/14] Some record/replay fixes, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 01/14] replay: add missing fix for internal function, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 02/14] block: implement bdrv_snapshot_goto for blkreplay, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 03/14] replay: disable default snapshot for record/replay, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 04/14] replay: update docs for record/replay with block devices,
Pavel Dovgalyuk <=
- [Qemu-devel] [PATCH for-4.2 05/14] replay: don't drain/flush bdrv queue while RR is working, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 06/14] replay: finish record/replay before closing the disks, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 07/14] replay: provide an accessor for rr filename, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 08/14] replay: add BH oneshot event for block layer, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 09/14] replay: document development rules, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 10/14] util/qemu-timer: refactor deadline calculation for external timers, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 11/14] replay: fix replay shutdown, Pavel Dovgalyuk, 2019/07/24
- [Qemu-devel] [PATCH for-4.2 12/14] replay: refine replay-time module, Pavel Dovgalyuk, 2019/07/24