diff --git a/hypervisor/arch/x86/Kconfig b/hypervisor/arch/x86/Kconfig
index 0cbbe87ca..cb0f70266 100644
--- a/hypervisor/arch/x86/Kconfig
+++ b/hypervisor/arch/x86/Kconfig
@@ -147,3 +147,8 @@ config MTRR_ENABLED
 config RELOC
 	bool "Enable relocation"
 	default y
+
+config IOMMU_INIT_BUS_LIMIT
+	hex "bus limitation when iommu init"
+	default 0xf if PLATFORM_SBL
+	default 0xff if PLATFORM_UEFI
diff --git a/hypervisor/arch/x86/vtd.c b/hypervisor/arch/x86/vtd.c
index e7102b8f7..513990580 100644
--- a/hypervisor/arch/x86/vtd.c
+++ b/hypervisor/arch/x86/vtd.c
@@ -17,11 +17,6 @@
 #define ACRN_DBG_IOMMU 6U
 #endif
 
-/* set an appropriate bus limitation when iommu init,
- * to reduce memory & time cost
- */
-#define IOMMU_INIT_BUS_LIMIT        (0xfU)
-
 #define LEVEL_WIDTH 9U
 
 #define ROOT_ENTRY_LOWER_PRESENT_POS        (0U)
@@ -1300,7 +1295,7 @@ void init_iommu_vm0_domain(struct vm *vm0)
 
 	vm0_domain = (struct iommu_domain *) vm0->iommu;
 
-	for (bus = 0U; bus <= IOMMU_INIT_BUS_LIMIT; bus++) {
+	for (bus = 0U; bus <= CONFIG_IOMMU_INIT_BUS_LIMIT; bus++) {
 		for (devfun = 0U; devfun <= 255U; devfun++) {
 			add_iommu_device(vm0_domain, 0U,
 				(uint8_t)bus, (uint8_t)devfun);