[PATCH 4/4] iotests: iothreads need ioeventfd

[Laurent Vivier <laurent@vivier.eu>]

And ioeventfd are only available with virtio-scsi-pci, so don't use the alias
and add a rule to require virtio-scsi-pci for the tests that use iothreads.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 tests/qemu-iotests/127        | 4 ++--
 tests/qemu-iotests/256        | 2 ++
 tests/qemu-iotests/iotests.py | 5 +++++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/127 b/tests/qemu-iotests/127
index 98e8e82a8210..a3693533685a 100755
--- a/tests/qemu-iotests/127
+++ b/tests/qemu-iotests/127
@@ -44,7 +44,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 _supported_fmt qcow2
 _supported_proto file fuse
 
-_require_devices virtio-scsi scsi-hd
+_require_devices virtio-scsi-pci scsi-hd
 
 IMG_SIZE=64K
 
@@ -62,7 +62,7 @@ $QEMU_IO -c 'write 0 42' "$TEST_IMG.overlay0" | _filter_qemu_io
 _launch_qemu \
     -object iothread,id=iothr \
     -blockdev node-name=source,driver=$IMGFMT,file.driver=file,file.filename="$TEST_IMG.overlay0" \
-    -device virtio-scsi,id=scsi-bus,iothread=iothr \
+    -device virtio-scsi-pci,id=scsi-bus,iothread=iothr \
     -device scsi-hd,bus=scsi-bus.0,drive=source
 
 _send_qemu_cmd $QEMU_HANDLE \
diff --git a/tests/qemu-iotests/256 b/tests/qemu-iotests/256
index 8d82a1dd865f..eb3af0dea80c 100755
--- a/tests/qemu-iotests/256
+++ b/tests/qemu-iotests/256
@@ -24,6 +24,8 @@ import os
 import iotests
 from iotests import log
 
+iotests._verify_virtio_scsi_pci()
+
 iotests.script_initialize(supported_fmts=['qcow2'])
 size = 64 * 1024 * 1024
 
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 1e9e6a066e90..3404ed534bb5 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -1146,6 +1146,11 @@ def _verify_virtio_blk() -> None:
     if 'virtio-blk' not in out:
         notrun('Missing virtio-blk in QEMU binary')
 
+def _verify_virtio_scsi_pci() -> None:
+    out = qemu_pipe('-M', 'none', '-device', 'help')
+    if 'virtio-scsi-pci' not in out:
+        notrun('Missing virtio-scsi-pci in QEMU binary')
+
 
 def supports_quorum():
     return 'quorum' in qemu_img_pipe('--help')
-- 
2.30.2