> I've investigated this issue. > This command line works ok: > -drive > > driver=blkreplay,if=none,image.driver=file,image.filename=testdisk.qcow,id=img-blkreplay > -device ide-hd,drive=img-blkreplay > > And this does not: > -drive > driver=blkreplay,if=none,image.driver=qcow2,image.file.driver=file,image.file.filename=testdisk.qcow > ,id=img-blkreplay > -device ide-hd,drive=img-blkreplay > > QEMU hangs at some moment of replay. > > I found that some dma requests do not pass through the blkreplay driver > due to the following line in block-backend.c: > return bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); > > This line passes read request directly to qcow driver and blkreplay cannot > process it to make deterministic.
I don't understand, blk->root should be the blkreplay here. Paolo
