block: qemu-iotests - test for live migration

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.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

tests/qemu-iotests/091

@@ -0,0 +1,105 @@
+#!/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
+owner=jcody@redhat.com
+
+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
+
+_make_test_img $size
+
+mkfifo "${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 -P 0x22 0 4M"' "(qemu)"
+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 $h2 'quit' ""
+
+echo "Check image pattern"
+${QEMU_IO} -c "read -P 0x22 0 4M" "${TEST_IMG}" | _filter_testdir | _filter_qemu_io
+
+echo "Running 'qemu-img check -r all \$TEST_IMG'"
+"${QEMU_IMG}" check -r all "${TEST_IMG}" 2>&1 | _filter_testdir | _filter_qemu
+
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/091.out

@@ -0,0 +1,28 @@
+QA output created by 091
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
+
+=== 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
+Check image pattern
+read 4194304/4194304 bytes at offset 0
+4 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Running 'qemu-img check -r all $TEST_IMG'
+No errors were found on the image.
+80/16384 = 0.49% allocated, 0.00% fragmented, 0.00% compressed clusters
+Image end offset: 5570560
+*** done

tests/qemu-iotests/group

@@ -96,3 +96,4 @@
 087 rw auto
 088 rw auto
 090 rw auto quick
+091 rw auto