selftests/vsock: add vsock_loopback module loading

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>
Link: https://patch.msgid.link/20251108-vsock-selftests-fixes-and-improvements-v4-11-d5e8d6c87289@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
index b611172da09e71f6231c103297e6df2928d011e2..42e155b45602f765281d670996fc100ae80a77b6 100755 (executable)
--- 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