From: Bobby Eshleman <bobbyeshleman@meta.com>

Add vsock_loopback module loading to the loopback test so that vmtest.sh
can be used for kernels built with loopback as a module.

This is not technically a fix as kselftest expects loopback to be
built-in already (defined in selftests/vsock/config). This is useful
only for using vmtest.sh outside of kselftest.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
---
 tools/testing/selftests/vsock/vmtest.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
index b611172da09e..42e155b45602 100755
--- a/tools/testing/selftests/vsock/vmtest.sh
+++ b/tools/testing/selftests/vsock/vmtest.sh
@@ -452,6 +452,8 @@ test_vm_client_host_server() {
 test_vm_loopback() {
 	local port=60000 # non-forwarded local port
 
+	vm_ssh -- modprobe vsock_loopback &> /dev/null || :
+
 	if ! vm_vsock_test "server" 1 "${port}"; then
 		return "${KSFT_FAIL}"
 	fi

-- 
2.47.3