qemu-iotests: Use ppc64 qemu_arch on ppc64le host

The qemu target does not always correspond to the host machine type. For
example ppc64le machine target is ppc64. Let's introduce "qemu_arch"
variable to store the matching qemu architecture related to the current
architecture and use it when auto-detecting the default qemu binary.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>
Message-id: 20180329112053.5399-2-ldoktor@redhat.com
Signed-off-by: NMax Reitz <mreitz@redhat.com>

tests/qemu-iotests/check

@@ -538,8 +538,8 @@ if [ -z "$QEMU_PROG" ]
 then
     if [ -x "$build_iotests/qemu" ]; then
         export QEMU_PROG="$build_iotests/qemu"
-    elif [ -x "$build_root/$arch-softmmu/qemu-system-$arch" ]; then
-        export QEMU_PROG="$build_root/$arch-softmmu/qemu-system-$arch"
+    elif [ -x "$build_root/${qemu_arch}-softmmu/qemu-system-${qemu_arch}" ]; then
+        export QEMU_PROG="$build_root/${qemu_arch}-softmmu/qemu-system-${qemu_arch}"
     else
         pushd "$build_root" > /dev/null
         for binary in *-softmmu/qemu-system-*

tests/qemu-iotests/common.config

@@ -23,6 +23,7 @@ PATH=".:$PATH"
 
 HOSTOS=`uname -s`
 arch=`uname -m`
+[[ "$arch" =~ "ppc64" ]] && qemu_arch=ppc64 || qemu_arch="$arch"
 
 export PWD=`pwd`