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Re: [Qemu-devel] [PATCH v3 2/2] tests/qemu-iotests: adding savevm/loadvm


From: Daniel Henrique Barboza
Subject: Re: [Qemu-devel] [PATCH v3 2/2] tests/qemu-iotests: adding savevm/loadvm with postcopy flag test
Date: Sun, 3 Dec 2017 18:13:10 -0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

Hi Max,

On 12/01/2017 06:13 PM, Max Reitz wrote:
On 2017-11-16 23:35, Daniel Henrique Barboza wrote:
This patch implements a test case for the scenario that was failing
prior to the patch "migration/ram.c: do not set 'postcopy_running' in
POSTCOPY_INCOMING_END".

This new test file 198 was derived from the test file 181 authored
by Kevin Wolf.

CC: Kevin Wolf <address@hidden>
CC: Max Reitz <address@hidden>
CC: Cleber Rosa <address@hidden>
Signed-off-by: Daniel Henrique Barboza <address@hidden>

---
I CCed Cleber Rosa because this patch was developed at the same
time his patch series "[PATCH 00/10] I/O tests cleanups" hit the
mailing list. Most of the cleanups/fixes he made in the series was
done in this new test as well.

  tests/qemu-iotests/198     | 110 +++++++++++++++++++++++++++++++++++++++++++++
  tests/qemu-iotests/198.out |  20 +++++++++
  tests/qemu-iotests/group   |   1 +
  3 files changed, 131 insertions(+)
  create mode 100755 tests/qemu-iotests/198
  create mode 100644 tests/qemu-iotests/198.out
Looks good overall, just two nitpicks below.

diff --git a/tests/qemu-iotests/198 b/tests/qemu-iotests/198
new file mode 100755
index 0000000000..786e37fc95
--- /dev/null
+++ b/tests/qemu-iotests/198
@@ -0,0 +1,110 @@
+#!/bin/bash
+#
+# Test savevm and loadvm after live migration with postcopy flag
+#
+# Copyright (C) 2017, IBM Corporation.
+#
+# This file is derived from tests/qemu-iotests/181 by Kevin Wolf
+#
+# 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/Owner : address@hidden
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+status=1       # failure is the default!
+
+MIG_SOCKET="${TEST_DIR}/migrate"
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.qemu
+
+_cleanup()
+{
+    rm -f "${MIG_SOCKET}"
+    _cleanup_test_img
+    _cleanup_qemu
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_supported_fmt qcow2
+_supported_proto generic
+_supported_os Linux
+
+size=64M
+_make_test_img $size
+
+echo
+echo === Starting VMs ===
+echo
+
+qemu_comm_method="monitor"
+
+if [ "$IMGOPTSSYNTAX" = "true" ]; then
+    _launch_qemu \
+        -drive "${TEST_IMG}",cache=${CACHEMODE},id=disk
+else
+    _launch_qemu \
+        -drive file="${TEST_IMG}",cache=${CACHEMODE},driver=$IMGFMT,id=disk
+fi
+src=$QEMU_HANDLE
+
+if [ "$IMGOPTSSYNTAX" = "true" ]; then
+    _launch_qemu \
+        -drive "${TEST_IMG}",cache=${CACHEMODE},id=disk \
+        -incoming "unix:${MIG_SOCKET}"
+else
+    _launch_qemu \
+        -drive file="${TEST_IMG}",cache=${CACHEMODE},driver=$IMGFMT,id=disk \
+        -incoming "unix:${MIG_SOCKET}"
+fi
+dest=$QEMU_HANDLE
+
+echo
+echo === Set \'migrate_set_capability postcopy-ram on\' and migrate ===
+echo
+
+silent=yes
+_send_qemu_cmd $dest 'migrate_set_capability postcopy-ram on' "(qemu)"
+_send_qemu_cmd $src 'migrate_set_capability postcopy-ram on' "(qemu)"
+_send_qemu_cmd $src "migrate -d unix:${MIG_SOCKET}" "(qemu)"
+
+QEMU_COMM_TIMEOUT=1 qemu_cmd_repeat=10 silent=yes \
+    _send_qemu_cmd $src "info migrate" "completed\|failed"
+silent=yes _send_qemu_cmd $src "" "(qemu)"
Would it make sense to query the migration status non-silently here,
too, so that the test output would verify that it has actually succeeded?

(I suppose the savevm/loadvm coming up next would fail if the migration
failed, but maybe if it's easy enough...)

Not exactly non-silently, but we can do something like this:


echo
echo === Check if migration was successful ===
echo

QEMU_COMM_TIMEOUT=1 silent=yes \
    _send_qemu_cmd $src "info migrate" "completed"
silent=yes _send_qemu_cmd $src "" "(qemu)"


If migration failed, the test will fail with timeout error waiting for "completed"
prior to savevm. What do you think?



+
+echo
+echo === On destination, execute savevm and loadvm ===
+echo
+
+silent=
+_send_qemu_cmd $dest 'savevm state1"' "(qemu)"
+_send_qemu_cmd $dest 'loadvm state1"' "(qemu)"
Any specific reason why the snapshot name has a trailing double quote?

No reason, just an ugly that slipped by. I'll remove it in the next version.



Thanks,


Daniel



Max

+
+echo
+echo === Shut down and check image ===
+echo
+
+_send_qemu_cmd $src 'quit' ""
+_send_qemu_cmd $dest 'quit' ""
+wait=1 _cleanup_qemu
+
+_check_test_img
+
+# success, all done
+echo "*** done"
+status=0
diff --git a/tests/qemu-iotests/198.out b/tests/qemu-iotests/198.out
new file mode 100644
index 0000000000..6c27303857
--- /dev/null
+++ b/tests/qemu-iotests/198.out
@@ -0,0 +1,20 @@
+QA output created by 198
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+
+=== Starting VMs ===
+
+
+=== Set 'migrate_set_capability postcopy-ram on' and migrate ===
+
+
+=== On destination, execute savevm and loadvm ===
+
+(qemu) savevm state1"
+(qemu) loadvm state1"
+
+=== Shut down and check image ===
+
+(qemu) quit
+(qemu) quit
+No errors were found on the image.
+*** done
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 24e5ad1b79..84d082bc38 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -194,3 +194,4 @@
  194 rw auto migration quick
  195 rw auto quick
  197 rw auto quick
+198 rw auto migration





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