> From: Kevin Wolf [mailto:kw...@redhat.com] > Am 17.09.2019 um 13:58 hat Pavel Dovgalyuk geschrieben: > > From: Pavel Dovgalyuk <pavel.dovga...@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.dovga...@ispras.ru> > > --- > > 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 > > Wait, didn't patch 2 just make -snapshot unconditionally incompatible > with replay? So isn't saving the snapshot in the original image the only > supported mode now?
There are two ways to run record/replay: 1. Disk with snapshot option and any image to make it unchanged 2. Disk with overlay without snapshot option to save VM snapshots on it Pavel Dovgalyuk