D51553.diff
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	diff --git a/sys/amd64/vmm/vmm_dev_machdep.c b/sys/amd64/vmm/vmm_dev_machdep.c
	--- a/sys/amd64/vmm/vmm_dev_machdep.c
	+++ b/sys/amd64/vmm/vmm_dev_machdep.c
	@@ -2,6 +2,7 @@
	* SPDX-License-Identifier: BSD-2-Clause
	*
	* Copyright (c) 2011 NetApp, Inc.
	+ * Copyright (c) 2026 Hans Rosenfeld
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	@@ -569,6 +570,13 @@
	free(entries, M_VMMDEV);
	break;
	}
	+ } else {
	+ /*
	+ * Not using "legacy" handling and no cpuid entries
	+ * given isn't allowed either.
	+ */
	+ error = EINVAL;
	+ break;
	}

	vcpu_cpuid_config_t vm_cfg = {