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From: Kevin Wolf <kwolf@redhat.com>
To: qemu-block@nongnu.org
Cc: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org
Subject: [PULL 04/15] replay: update docs for record/replay with block devices
Date: Mon, 14 Oct 2019 18:03:38 +0200	[thread overview]
Message-ID: <20191014160343.8211-5-kwolf@redhat.com> (raw)
In-Reply-To: <20191014160343.8211-1-kwolf@redhat.com>

From: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

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>
---
 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



  parent reply	other threads:[~2019-10-14 16:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-14 16:03 [PULL 00/15] Block layer patches Kevin Wolf
2019-10-14 16:03 ` [PULL 01/15] block/vhdx: add check for truncated image files Kevin Wolf
2019-10-14 16:03 ` [PULL 02/15] block: implement bdrv_snapshot_goto for blkreplay Kevin Wolf
2019-10-14 16:03 ` [PULL 03/15] replay: disable default snapshot for record/replay Kevin Wolf
2019-10-14 16:03 ` Kevin Wolf [this message]
2019-10-14 16:03 ` [PULL 05/15] replay: don't drain/flush bdrv queue while RR is working Kevin Wolf
2019-10-14 16:03 ` [PULL 06/15] replay: finish record/replay before closing the disks Kevin Wolf
2019-10-14 16:03 ` [PULL 07/15] replay: add BH oneshot event for block layer Kevin Wolf
2019-10-14 16:03 ` [PULL 08/15] block: Reject misaligned write requests with BDRV_REQ_NO_FALLBACK Kevin Wolf
2019-10-14 16:03 ` [PULL 09/15] iotests/028: Fix for long $TEST_DIRs Kevin Wolf
2019-10-15 16:09 ` [PULL 00/15] Block layer patches Peter Maydell

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