linux-kernel - [PATCH 13/14] tools/virtio: fix up oot build

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Message-ID: <33968faa7994b86d1f78057358a50b8f460c7a23.1764873799.git.mst@redhat.com>
Date: Thu, 4 Dec 2025 13:46:30 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	virtualization@...ts.linux.dev
Subject: [PATCH 13/14] tools/virtio: fix up oot build

oot build tends to help uncover bugs so it's worth keeping around,
as long as it's low effort.
add stubs for a couple of macros virtio gained recently,
and disable vdpa in the test build.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 tools/virtio/Makefile    |  5 +++--
 tools/virtio/oot-stubs.h | 10 ++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)
 create mode 100644 tools/virtio/oot-stubs.h

diff --git a/tools/virtio/Makefile b/tools/virtio/Makefile
index a60316211df6..2cac5fd4b979 100644
--- a/tools/virtio/Makefile
+++ b/tools/virtio/Makefile
@@ -38,8 +38,9 @@ OOT_CONFIGS=\
 	CONFIG_VHOST_NET=n \
 	CONFIG_VHOST_SCSI=n \
 	CONFIG_VHOST_VSOCK=n \
-	CONFIG_VHOST_RING=n
-OOT_BUILD=KCFLAGS="-I "${OOT_VHOST} ${MAKE} -C ${OOT_KSRC} V=${V}
+	CONFIG_VHOST_RING=n \
+	CONFIG_VHOST_VDPA=n
+OOT_BUILD=KCFLAGS="-include "`pwd`"/oot-stubs.h -I "${OOT_VHOST} ${MAKE} -C ${OOT_KSRC} V=${V}
 oot-build:
 	echo "UNSUPPORTED! Don't use the resulting modules in production!"
 	${OOT_BUILD} M=`pwd`/vhost_test
diff --git a/tools/virtio/oot-stubs.h b/tools/virtio/oot-stubs.h
new file mode 100644
index 000000000000..69e059cd14d6
--- /dev/null
+++ b/tools/virtio/oot-stubs.h
@@ -0,0 +1,10 @@
+#include <linux/bug.h>
+#include <linux/string.h>
+#include <linux/virtio_features.h>
+
+#ifndef VIRTIO_FEATURES_BITS
+#define VIRTIO_FEATURES_BITS 128
+#endif
+#ifndef VIRTIO_U64
+#define VIRTIO_U64(b)           ((b) >> 6)
+#endif
-- 
MST