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diff --git a/sys/amd64/vmm/vmm_dev.c b/sys/amd64/vmm/vmm_dev.c
--- a/sys/amd64/vmm/vmm_dev.c
+++ b/sys/amd64/vmm/vmm_dev.c
@@ -1225,7 +1225,12 @@
struct cdev *cdev;
int error;
- error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &devmemsw, NULL,
+ mtx_lock(&vmmdev_mtx);
+ sc = vmmdev_lookup(vmname);
+ KASSERT(sc != NULL, ("%s: vm %s softc not found", __func__, vmname));
+ mtx_unlock(&vmmdev_mtx);
+
+ error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &devmemsw, sc->ucred,
UID_ROOT, GID_WHEEL, 0600, "vmm.io/%s.%s", vmname, devname);
if (error)
return (error);

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