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| author | Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> | 2019-09-17 14:58:02 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-10-14 17:12:48 +0200 |
| commit | de499eb67cda5c852605fe365950844412cbe789 (patch) | |
| tree | a1b36665cda1060622b2ef9f2e62705bfa7a2580 /docs/replay.txt | |
| parent | 258639754461e39d307ce3d340d213e0e5f339e3 (diff) | |
replay: update docs for record/replay with block devices
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>
Diffstat (limited to 'docs/replay.txt')
| -rw-r--r-- | docs/replay.txt | 12 |
1 files 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. |