diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c
index cec8c0eefc..7eb210ffa8 100644
--- a/hw/9pfs/9p-synth.c
+++ b/hw/9pfs/9p-synth.c
@@ -541,8 +541,6 @@ static int synth_init(FsContext *ctx, Error **errp)
     QLIST_INIT(&synth_root.child);
     qemu_mutex_init(&synth_mutex);
 
-    ctx->export_flags |= V9FS_NO_PERF_WARN;
-
     /* Add "." and ".." entries for root */
     v9fs_add_dir_node(&synth_root, synth_root.attr->mode,
                       "..", synth_root.attr, synth_root.attr->inode);
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 36f3aa9352..14371a78ef 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -21,6 +21,7 @@
 #include "hw/virtio/virtio-access.h"
 #include "qemu/iov.h"
 #include "qemu/module.h"
+#include "sysemu/qtest.h"
 
 static void virtio_9p_push_and_notify(V9fsPDU *pdu)
 {
@@ -199,6 +200,11 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     V9fsVirtioState *v = VIRTIO_9P(dev);
     V9fsState *s = &v->state;
+    FsDriverEntry *fse = get_fsdev_fsentry(s->fsconf.fsdev_id);
+
+    if (qtest_enabled() && fse) {
+        fse->export_flags |= V9FS_NO_PERF_WARN;
+    }
 
     if (v9fs_device_realize_common(s, &virtio_9p_transport, errp)) {
         return;