diff --git a/sys/amd64/vmm/vmm_cpuid.c b/sys/amd64/vmm/vmm_cpuid.c
--- a/sys/amd64/vmm/vmm_cpuid.c
+++ b/sys/amd64/vmm/vmm_cpuid.c
@@ -28,7 +28,7 @@
 /*
  * Copyright 2014 Pluribus Networks Inc.
  * Copyright 2018 Joyent, Inc.
- * Copyright 2022 Oxide Computer Company
+ * Copyright 2024 Oxide Computer Company
  */
 
 #include <sys/param.h>
@@ -543,7 +543,7 @@
 				goto default_leaf;
 
 			/*
-			 * Similar to Intel, generate a ficticious cache
+			 * Similar to Intel, generate a fictitious cache
 			 * topology for the guest with L3 shared by the
 			 * package, and L1 and L2 local to a core.
 			 */
@@ -572,10 +572,15 @@
 				break;
 			}
 
-			logical_cpus = MIN(0xfff, logical_cpus - 1);
-			regs[0] = (logical_cpus << 14) | (1 << 8) |
-			    (level << 5) | func;
-			regs[1] = func > 0 ? CACHE_LINE_SIZE - 1 : 0;
+			if (level == 0) {
+				regs[0] = 0;
+				regs[1] = 0;
+			} else {
+				logical_cpus = MIN(0xfff, logical_cpus - 1);
+				regs[0] = (logical_cpus << 14) | (1 << 8) |
+				    (level << 5) | func;
+				regs[1] = func > 0 ? CACHE_LINE_SIZE - 1 : 0;
+			}
 
 			/*
 			 * ecx: Number of cache ways for non-fully