From: Paolo Bonzini <pbonzini@redhat.com>
To: Max Reitz <mreitz@redhat.com>,
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
Bruce Rogers <brogers@suse.com>,
Claudio Fontana <cfontana@suse.de>,
Thomas Huth <thuth@redhat.com>,
Juan Quintela <quintela@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Kevin Wolf <kwolf@redhat.com>
Cc: "Jason J. Herne" <jjherne@linux.ibm.com>,
Fam Zheng <fam@euphon.net>, Liang Yan <lyan@suse.com>,
Peter Maydell <peter.maydell@linaro.org>,
Cornelia Huck <cohuck@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: migration: broken snapshot saves appear on s390 when small fields in migration stream removed
Date: Tue, 28 Jul 2020 14:09:18 +0200 [thread overview]
Message-ID: <1c3c876b-6f33-62e9-ace3-7f83e62ceea2@redhat.com> (raw)
In-Reply-To: <0e175bbb-6d5e-f509-7a4f-e3e4769c13a1@redhat.com>
On 28/07/20 13:45, Max Reitz wrote:
>> Is it possible to make a quick testcase using qemu-io?
> This seems to work:
>
> $ qemu-img create -f qcow2 -o cluster_size=512 base.qcow2 512
> $ qemu-img create -f qcow2 -o cluster_size=512 -F qcow2 -b base.qcow2 \
> top.qcow2 1024
> $ qemu-io -c 'write -P 42 0 512' top.qcow2
> $ qemu-io -c 'read -v 0 1024' top.qcow2
>
> That should print 512 times “2a” and then 512 times “00”, but beyond
> 512, the buffer stays uninitialized; instead, the first 512 bytes are
> zeroed. (With the patch, it works as expected.)
>
Wow, that's great (and a good recipe for qemu-iotests too). Thanks.
Paolo
next prev parent reply other threads:[~2020-07-28 12:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-12 10:00 migration: broken snapshot saves appear on s390 when small fields in migration stream removed Claudio Fontana
2020-07-12 16:11 ` Paolo Bonzini
2020-07-13 9:11 ` Claudio Fontana
2020-07-14 14:29 ` Claudio Fontana
2020-07-14 14:35 ` Thomas Huth
2020-07-15 11:10 ` Claudio Fontana
2020-07-15 12:25 ` Claudio Fontana
2020-07-16 12:58 ` Claudio Fontana
2020-07-20 18:24 ` Claudio Fontana
2020-07-21 8:22 ` Claudio Fontana
2020-07-27 23:09 ` Bruce Rogers
2020-07-28 8:15 ` Vladimir Sementsov-Ogievskiy
2020-07-28 8:43 ` Vladimir Sementsov-Ogievskiy
2020-07-28 13:23 ` Bruce Rogers
2020-07-28 11:10 ` Max Reitz
2020-07-28 11:27 ` Vladimir Sementsov-Ogievskiy
2020-07-28 11:33 ` Vladimir Sementsov-Ogievskiy
2020-07-28 11:35 ` Paolo Bonzini
2020-07-28 11:45 ` Max Reitz
2020-07-28 12:09 ` Paolo Bonzini [this message]
2020-07-28 12:47 ` Claudio Fontana
2020-07-13 11:03 ` Dr. David Alan Gilbert
2020-07-13 11:39 ` Cornelia Huck
2020-07-13 11:39 ` Claudio Fontana
2020-07-13 11:45 ` Claudio Fontana
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