diff --git a/hypervisor/boot/guest/direct_boot.c b/hypervisor/boot/guest/direct_boot.c
index 210b0bdcc..d54636fd0 100644
--- a/hypervisor/boot/guest/direct_boot.c
+++ b/hypervisor/boot/guest/direct_boot.c
@@ -11,15 +11,18 @@
 #include <cpu.h>
 #include <direct_boot.h>
 
+/* AP trampoline code buffer base address. */
+static uint64_t ap_trampoline_buf;
+
 static void init_direct_boot(void)
 {
-	/* nothing to do for now */
+	ap_trampoline_buf = e820_alloc_low_memory(CONFIG_LOW_RAM_SIZE);
 }
 
 /* @post: return != 0UL */
 static uint64_t get_direct_boot_ap_trampoline(void)
 {
-	return e820_alloc_low_memory(CONFIG_LOW_RAM_SIZE);
+	return ap_trampoline_buf;
 }
 
 static void* get_direct_boot_rsdp(void)