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replay: update docs for record/replay with block devices

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This patch updates the description of the command lines for using
record/replay with attached block devices.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2019-09-17 14:58:02 +03:00 committed by Kevin Wolf
parent 2586397544
commit de499eb67c
1 changed files with 9 additions and 3 deletions
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12
docs/replay.txt
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@ -27,7 +27,7 @@ Usage of the record/replay:
* First, record the execution with the following command line: * First, record the execution with the following command line:
qemu-system-i386 \ qemu-system-i386 \
-icount shift=7,rr=record,rrfile=replay.bin \ -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 \ -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \
-device ide-hd,drive=img-blkreplay \ -device ide-hd,drive=img-blkreplay \
-netdev user,id=net1 -device rtl8139,netdev=net1 \ -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: * After recording, you can replay it by using another command line:
qemu-system-i386 \ qemu-system-i386 \
-icount shift=7,rr=replay,rrfile=replay.bin \ -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 \ -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \
-device ide-hd,drive=img-blkreplay \ -device ide-hd,drive=img-blkreplay \
-netdev user,id=net1 -device rtl8139,netdev=net1 \ -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. bdrv coroutine functions at the top of block drivers stack.
To record and replay block operations the drive must be configured To record and replay block operations the drive must be configured
as following: 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 -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay
-device ide-hd,drive=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 of replaying. It also can be loaded while replaying to roll back
the execution. 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 Use QEMU monitor to create additional snapshots. 'savevm <name>' command
created the snapshot and 'loadvm <name>' restores it. To prevent corruption created the snapshot and 'loadvm <name>' restores it. To prevent corruption
of the original disk image, use overlay files linked to the original images. of the original disk image, use overlay files linked to the original images.