[PATCH v2 2/2] tools/virtio: Add hints when module is not installed

[liming . wu]

From: Liming Wu <liming.wu@xxxxxxxxxxxxxxx>

Need to insmod vhost_test.ko before run virtio_test.
Give some hints to users.

Signed-off-by: Liming Wu <liming.wu@xxxxxxxxxxxxxxx>
---
 tools/virtio/virtio_test.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 028f54e6854a..13572a677c35 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -135,6 +135,10 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
 	dev->buf = malloc(dev->buf_size);
 	assert(dev->buf);
 	dev->control = open("/dev/vhost-test", O_RDWR);
+
+	if (dev->control < 0)
+		fprintf(stderr,
+			"Install vhost_test module (./vhost_test/vhost_test.ko) first.\n");
 	assert(dev->control >= 0);
 	r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
 	assert(r >= 0);
-- 
2.34.1