From: "Pavel Dovgalyuk" <dovgaluk@ispras.ru>
To: "'Kevin Wolf'" <kwolf@redhat.com>
Cc: peter.maydell@linaro.org, pavel.dovgaluk@ispras.ru,
quintela@redhat.com, ciro.santilli@gmail.com,
jasowang@redhat.com, crosthwaite.peter@gmail.com,
qemu-devel@nongnu.org, armbru@redhat.com, alex.bennee@linaro.org,
maria.klimushenkova@ispras.ru, mst@redhat.com, kraxel@redhat.com,
boost.lists@gmail.com, thomas.dullien@googlemail.com,
pbonzini@redhat.com, mreitz@redhat.com,
artem.k.pisarenko@gmail.com, dgilbert@redhat.com,
rth@twiddle.net
Subject: RE: [for-4.2 PATCH 3/6] replay: update docs for record/replay with block devices
Date: Fri, 18 Oct 2019 15:06:04 +0300 [thread overview]
Message-ID: <003901d585ac$6a9b9d30$3fd2d790$@ru> (raw)
In-Reply-To: <20191011091232.GB5158@localhost.localdomain>
> From: Kevin Wolf [mailto:kwolf@redhat.com]
> Am 11.10.2019 um 08:10 hat Pavel Dovgalyuk geschrieben:
> > > From: Kevin Wolf [mailto:kwolf@redhat.com]
> > > Am 25.09.2019 um 11:02 hat Pavel Dovgalyuk geschrieben:
> > > > I started playing with -blockdev: added new blockdev for blkreplay and
> > > > constructed the following command line:
> > > >
> > > > -blockdev driver=file,filename=disk.img,node-name=hd0
> > > > -blockdev driver=blkreplay,file=hd0,node-name=hd0-rr
> > > > -device virtio-blk-device,drive=hd0-rr
> > > >
> > > > However, I get an error: "Could not open 'disk.img': Permission denied"
> > > > Everything works when I use this file in '-drive' parameter.
> > > > What am I doing wrong?
> > >
> > > The reason why I didn't reply immediately is because I don't see
> > > anything wrong in the options you used.
> > >
> > > Just to confirm, do you still get the same error when you use only the
> > > first -blockdev option and no other options at all?
> >
> > Ok, I tried again and got different error, which was caused by incorrect
> > QAPI schema for blkreplay.
> > Now it seems ok, but I still can't boot.
>
> Hm... Are you actually using a raw image? If not, you need the format
> driver, too, and would end up with something like:
>
> -blockdev driver=file,filename=disk.qcow2,node-name=hd0
> -blockdev driver=qcow2,file=hd0,node-name=hd0-qcow2
> -blockdev driver=blkreplay,file=hd0-qcow2,node-name=hd0-rr
> -device virtio-blk-device,drive=hd0-rr
>
> (The first two can be combined into a single option by using a syntax
> like file.driver=file,file.filename=disk.qcow2, but defining each node
> separately is a bit cleaner.)
Ok, this works.
Now I'm trying to check root of the nodes in blk_insert_bs.
This command line leads to 2 invocations of this function:
1. bs->drv is file
2. bs->drv is blkreplay
How then can we check "snapshot" node attachment?
Pavel Dovgalyuk
next prev parent reply other threads:[~2019-10-18 12:06 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 11:57 [Qemu-devel] [for-4.2 PATCH 0/6] Block-related record/replay fixes Pavel Dovgalyuk
2019-09-17 11:57 ` [Qemu-devel] [for-4.2 PATCH 1/6] block: implement bdrv_snapshot_goto for blkreplay Pavel Dovgalyuk
2019-09-17 11:57 ` [Qemu-devel] [for-4.2 PATCH 2/6] replay: disable default snapshot for record/replay Pavel Dovgalyuk
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 3/6] replay: update docs for record/replay with block devices Pavel Dovgalyuk
2019-09-18 9:18 ` Kevin Wolf
2019-09-18 9:22 ` Pavel Dovgalyuk
2019-09-18 9:33 ` Kevin Wolf
2019-09-18 9:37 ` Pavel Dovgalyuk
2019-09-18 9:44 ` Kevin Wolf
2019-09-18 9:52 ` Pavel Dovgalyuk
2019-09-19 8:53 ` Kevin Wolf
2019-09-19 9:05 ` Pavel Dovgalyuk
2019-09-19 11:27 ` Kevin Wolf
2019-09-19 12:10 ` Pavel Dovgalyuk
2019-09-19 13:00 ` Kevin Wolf
2019-09-20 7:25 ` Pavel Dovgalyuk
2019-09-20 10:01 ` Kevin Wolf
2019-09-23 6:15 ` Pavel Dovgalyuk
2019-09-25 9:02 ` Pavel Dovgalyuk
2019-10-01 8:22 ` Pavel Dovgalyuk
2019-10-10 15:28 ` Kevin Wolf
2019-10-11 6:10 ` Pavel Dovgalyuk
2019-10-11 9:12 ` Kevin Wolf
2019-10-18 12:06 ` Pavel Dovgalyuk [this message]
2019-10-18 14:16 ` Kevin Wolf
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 4/6] replay: don't drain/flush bdrv queue while RR is working Pavel Dovgalyuk
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 5/6] replay: finish record/replay before closing the disks Pavel Dovgalyuk
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 6/6] replay: add BH oneshot event for block layer Pavel Dovgalyuk
2019-09-17 18:09 ` [Qemu-devel] [for-4.2 PATCH 0/6] Block-related record/replay fixes no-reply
2019-09-17 18:10 ` no-reply
2019-09-17 19:01 ` Alex Bennée
2019-09-18 8:26 ` Pavel Dovgalyuk
2019-09-18 10:42 ` Alex Bennée
2019-09-18 11:32 ` Pavel Dovgalyuk
2019-10-11 9:17 ` Kevin Wolf
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