Re: [Qemu-devel] [PATCH v4 3/3] block: qemu-iotests - test for live migration

[Jeff Cody]

On Wed, Apr 30, 2014 at 10:28:11AM +0800, Fam Zheng wrote:
> On Tue, 04/29 18:39, Jeff Cody wrote:
> > This is an initial, simple live migration test from one
> > running VM to another, using monitor commands.
> > 
> > This is also an example of using the new common.qemu functions
> > for controlling multiple running qemu instances, for tests that
> > need a live qemu vm.
> > 
> > Signed-off-by: Jeff Cody <address@hidden>
> 
> Just some minor points below, but the code itself looks good,
> 
> Reviewed-by: Fam Zheng <address@hidden>
> 
> > ---
> >  tests/qemu-iotests/091     | 102 
> > +++++++++++++++++++++++++++++++++++++++++++++
> >  tests/qemu-iotests/091.out |  25 +++++++++++
> >  tests/qemu-iotests/group   |   1 +
> >  3 files changed, 128 insertions(+)
> >  create mode 100755 tests/qemu-iotests/091
> >  create mode 100644 tests/qemu-iotests/091.out
> > 
> > diff --git a/tests/qemu-iotests/091 b/tests/qemu-iotests/091
> > new file mode 100755
> > index 0000000..7f6142f
> > --- /dev/null
> > +++ b/tests/qemu-iotests/091
> > @@ -0,0 +1,102 @@
> > +#!/bin/bash
> > +#
> > +# Live migration test
> > +#
> > +# Performs a migration from one VM to another via monitor commands
> > +#
> > +# Copyright (C) 2014 Red Hat, Inc.
> > +#
> > +# This program is free software; you can redistribute it and/or modify
> > +# it under the terms of the GNU General Public License as published by
> > +# the Free Software Foundation; either version 2 of the License, or
> > +# (at your option) any later version.
> > +#
> > +# This program is distributed in the hope that it will be useful,
> > +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +# GNU General Public License for more details.
> > +#
> > +# You should have received a copy of the GNU General Public License
> > +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> > +#
> > +
> > +# creator
> > address@hidden
> > +
> > +seq=`basename $0`
> > +echo "QA output created by $seq"
> > +
> > +here=`pwd`
> > +status=1    # failure is the default!
> > +
> > +MIG_FIFO="${TEST_DIR}/migrate"
> > +
> > +_cleanup()
> > +{
> > +    rm -f "${MIG_FIFO}"
> > +    _cleanup_qemu
> > +    _cleanup_test_img
> > +}
> > +trap "_cleanup; exit \$status" 0 1 2 3 15
> > +
> > +# get standard environment, filters and checks
> > +. ./common.rc
> > +. ./common.filter
> > +. ./common.qemu
> > +
> > +_supported_fmt qcow2
> > +_supported_proto file
> > +_supported_os Linux
> > +
> > +size=1G
> > +
> > +IMGOPTS="cluster_size=512" _make_test_img $size
> 
> Wondering why overrid cluster_size? If it matters for migration, should we
> cover more values as well?
>

That is there from a copy-paste, it is not really needed.  I'll drop
it.

> > +
> > +mkfifo "${MIG_FIFO}"
> > +
> > +echo
> > +echo === Starting QEMU VM1 ===
> > +echo
> > +
> > +qemu_comm_method="monitor"
> > +_launch_qemu -drive file="${TEST_IMG}",cache=none,id=disk
> > +h1=$QEMU_HANDLE
> > +
> > +echo
> > +echo === Starting QEMU VM2 ===
> > +echo
> > +_launch_qemu -drive file="${TEST_IMG}",cache=none,id=disk \
> > +             -incoming "exec: cat '${MIG_FIFO}'"
> > +h2=$QEMU_HANDLE
> > +
> > +echo
> > +echo === VM 1: Migrate from VM1 to VM2  ===
> > +echo
> > +
> > +silent=yes
> > +_send_qemu_cmd $h1 'qemu-io disk "write 0 4M"' "(qemu)"
> 
> Maybe, write with a pattern and verify after migration?
> 

Sure, I will add that in, thanks.

> > +echo "vm1: qemu-io disk write complete"
> > +_send_qemu_cmd $h1 "migrate \"exec: cat > '${MIG_FIFO}'\"" "(qemu)"
> > +echo "vm1: live migration started"
> > +qemu_cmd_repeat=20 _send_qemu_cmd $h1 "info migrate" "completed"
> > +echo "vm1: live migration completed"
> > +
> > +echo
> > +echo === VM 2: Post-migration, write to disk, verify running ===
> > +echo
> > +
> > +_send_qemu_cmd $h2 'qemu-io disk "write 4M 1M"' "(qemu)"
> > +echo "vm2: qemu-io disk write complete"
> > +qemu_cmd_repeat=20 _send_qemu_cmd $h2 "info status" "running"
> > +echo "vm2: qemu process running successfully"
> > +
> > +echo "vm2: flush io, and quit"
> > +_send_qemu_cmd $h2 'qemu-io disk flush' "(qemu)"
> > +_send_qemu_cmd $h2 'quit' ""
> > +
> > +echo "Running 'qemu-img check -r all \$TEST_IMG'"
> > +"${QEMU_IMG}" check -r all "${TEST_IMG}" 2>&1 | _filter_testdir | 
> > _filter_qemu
> > +
> > +echo "*** done"
> > +rm -f $seq.full
> > +status=0
> > diff --git a/tests/qemu-iotests/091.out b/tests/qemu-iotests/091.out
> > new file mode 100644
> > index 0000000..06ea939
> > --- /dev/null
> > +++ b/tests/qemu-iotests/091.out
> > @@ -0,0 +1,25 @@
> > +QA output created by 091
> > +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
> 
> Unnecessary ending whitespace.
>

The output itself that we are comparing against has the ending
whitespace, but I guess technically it is unnecessary since our
comparison in "check" ignores whitespace.

However, I think it best to keep the .out file matching the exact
expected output as much as possible.

> > +
> > +=== Starting QEMU VM1 ===
> > +
> > +
> > +=== Starting QEMU VM2 ===
> > +
> > +
> > +=== VM 1: Migrate from VM1 to VM2 ===
> > +
> > +vm1: qemu-io disk write complete
> > +vm1: live migration started
> > +vm1: live migration completed
> > +
> > +=== VM 2: Post-migration, write to disk, verify running ===
> > +
> > +vm2: qemu-io disk write complete
> > +vm2: qemu process running successfully
> > +vm2: flush io, and quit
> > +Running 'qemu-img check -r all $TEST_IMG'
> > +No errors were found on the image.
> > +10240/2097152 = 0.49% allocated, 0.00% fragmented, 0.00% compressed 
> > clusters
> > +Image end offset: 5642752
> > +*** done
> > diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
> > index 864643d..7fa0c73 100644
> > --- a/tests/qemu-iotests/group
> > +++ b/tests/qemu-iotests/group
> > @@ -95,3 +95,4 @@
> >  086 rw auto quick
> >  087 rw auto
> >  088 rw auto
> > +091 rw auto
> > -- 
> > 1.8.3.1
> > 
> >