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Index: head/usr.sbin/bhyve/acpi.c
===================================================================
--- head/usr.sbin/bhyve/acpi.c
+++ head/usr.sbin/bhyve/acpi.c
@@ -39,7 +39,9 @@
* The tables are placed in the guest's ROM area just below 1MB physical,
* above the MPTable.
*
- * Layout
+ * Layout (No longer correct at FADT and beyond due to properly
+ * calculating the size of the MADT to allow for changes to
+ * VM_MAXCPU above 21 which overflows this layout.)
* ------
* RSDP -> 0xf2400 (36 bytes fixed)
* RSDT -> 0xf2440 (36 bytes + 4*7 table addrs, 4 used)
@@ -74,18 +76,31 @@
#include "pci_emul.h"
/*
- * Define the base address of the ACPI tables, and the offsets to
- * the individual tables
+ * Define the base address of the ACPI tables, the sizes of some tables,
+ * and the offsets to the individual tables,
*/
#define BHYVE_ACPI_BASE 0xf2400
#define RSDT_OFFSET 0x040
#define XSDT_OFFSET 0x080
#define MADT_OFFSET 0x100
-#define FADT_OFFSET 0x200
-#define HPET_OFFSET 0x340
-#define MCFG_OFFSET 0x380
-#define FACS_OFFSET 0x3C0
-#define DSDT_OFFSET 0x400
+/*
+ * The MADT consists of:
+ * 44 Fixed Header
+ * 8 * maxcpu Processor Local APIC entries
+ * 12 I/O APIC entry
+ * 2 * 10 Interrupt Source Override entires
+ * 6 Local APIC NMI entry
+ */
+#define MADT_SIZE (44 + VM_MAXCPU*8 + 12 + 2*10 + 6)
+#define FADT_OFFSET (MADT_OFFSET + MADT_SIZE)
+#define FADT_SIZE 0x140
+#define HPET_OFFSET (FADT_OFFSET + FADT_SIZE)
+#define HPET_SIZE 0x40
+#define MCFG_OFFSET (HPET_OFFSET + HPET_SIZE)
+#define MCFG_SIZE 0x40
+#define FACS_OFFSET (MCFG_OFFSET + MCFG_SIZE)
+#define FACS_SIZE 0x40
+#define DSDT_OFFSET (FACS_OFFSET + FACS_SIZE)
#define BHYVE_ASL_TEMPLATE "bhyve.XXXXXXX"
#define BHYVE_ASL_SUFFIX ".aml"

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