This patch adds qemu machine type support to the io test suite.
Based on the qemu default machine type and alias of the default machine type
the reference output file can now vary from the default to a machine specific
output file if necessary. When using a machine specific reference file if the
default machine has an alias then use the alias as the output file name
otherwise use the default machine name as the output file name.

Reviewed-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Michael Mueller <m...@linux.vnet.ibm.com>
Signed-off-by: Xiao Guang Chen <che...@linux.vnet.ibm.com>
---
 tests/qemu-iotests/check         | 5 +++++
 tests/qemu-iotests/common.config | 9 +++++++++
 tests/qemu-iotests/iotests.py    | 1 +
 3 files changed, 15 insertions(+)

diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index baeae80..22b2e63 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -324,6 +324,11 @@ do
             fi
 
             reference="$source_iotests/$seq.out"
+            reference_machine="$source_iotests/$seq.$QEMU_DEFAULT_MACHINE.out"
+            if [ -f "$reference_machine" ]; then
+                reference="$reference_machine"
+            fi
+
             if [ "$CACHEMODE" = "none" ]; then
                 [ -f "$source_iotests/$seq.out.nocache" ] && 
reference="$source_iotests/$seq.out.nocache"
             fi
diff --git a/tests/qemu-iotests/common.config b/tests/qemu-iotests/common.config
index a1973ad..0288cb1 100644
--- a/tests/qemu-iotests/common.config
+++ b/tests/qemu-iotests/common.config
@@ -107,6 +107,15 @@ export QEMU=$QEMU_PROG
 export QEMU_IMG=$QEMU_IMG_PROG
 export QEMU_IO="$QEMU_IO_PROG $QEMU_IO_OPTIONS"
 export QEMU_NBD=$QEMU_NBD_PROG
+default_machine=$($QEMU -machine \? | awk '/(default)/{print $1}')
+default_alias_machine=$($QEMU -machine \? |\
+    awk -v var_default_machine="$default_machine"\)\
+    '{if ($(NF-2)=="(alias"&&$(NF-1)=="of"&&$(NF)==var_default_machine){print 
$1}}')
+if [ ! -z "$default_alias_machine" ]; then
+    default_machine="$default_alias_machine"
+fi
+
+export QEMU_DEFAULT_MACHINE="$default_machine"
 
 [ -f /etc/qemu-iotest.config ]       && . /etc/qemu-iotest.config
 
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 241b5ee..1f520ed 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -39,6 +39,7 @@ imgproto = os.environ.get('IMGPROTO', 'file')
 test_dir = os.environ.get('TEST_DIR', '/var/tmp')
 output_dir = os.environ.get('OUTPUT_DIR', '.')
 cachemode = os.environ.get('CACHEMODE')
+qemu_default_machine = os.environ.get('QEMU_DEFAULT_MACHINE')
 
 socket_scm_helper = os.environ.get('SOCKET_SCM_HELPER', 'socket_scm_helper')
 
-- 
1.9.1


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