diff --git a/hypervisor/arch/x86/guest/vm.c b/hypervisor/arch/x86/guest/vm.c
index 595760977..3a9de2b0f 100644
--- a/hypervisor/arch/x86/guest/vm.c
+++ b/hypervisor/arch/x86/guest/vm.c
@@ -231,7 +231,7 @@ static void prepare_prelaunched_vm_memmap(struct acrn_vm *vm, const struct acrn_
 		if (entry->length == 0UL) {
 			continue;
 		} else {
-			if (is_sw_sram_initialized && (entry->baseaddr == PRE_RTVM_SW_SRAM_BASE_GPA) &&
+			if (is_software_sram_enabled() && (entry->baseaddr == PRE_RTVM_SW_SRAM_BASE_GPA) &&
 				((vm_config->guest_flags & GUEST_FLAG_RT) != 0U)){
 				/* pass through Software SRAM to pre-RTVM */
 				ept_add_mr(vm, (uint64_t *)vm->arch_vm.nworld_eptp,
diff --git a/hypervisor/arch/x86/guest/vmexit.c b/hypervisor/arch/x86/guest/vmexit.c
index 0091a9d43..2bb8ae62e 100644
--- a/hypervisor/arch/x86/guest/vmexit.c
+++ b/hypervisor/arch/x86/guest/vmexit.c
@@ -408,7 +408,7 @@ static int32_t wbinvd_vmexit_handler(struct acrn_vcpu *vcpu)
 	struct acrn_vcpu *other;
 
 	/* GUEST_FLAG_RT has not set in post-launched RTVM before it has been created */
-	if ((!is_sw_sram_initialized) && (!has_rt_vm())) {
+	if ((!is_software_sram_enabled()) && (!has_rt_vm())) {
 		cache_flush_invalidate_all();
 	} else {
 		if (is_rt_vm(vcpu->vm)) {
diff --git a/hypervisor/arch/x86/rtcm.c b/hypervisor/arch/x86/rtcm.c
index e40824a7c..02b0f5d5c 100644
--- a/hypervisor/arch/x86/rtcm.c
+++ b/hypervisor/arch/x86/rtcm.c
@@ -16,7 +16,7 @@ static uint64_t software_sram_bottom_hpa;
 static uint64_t software_sram_top_hpa;
 
 /* is_sw_sram_initialized is used to tell whether Software SRAM is successfully initialized for all cores */
-volatile bool is_sw_sram_initialized = false;
+static volatile bool is_sw_sram_initialized = false;
 
 #ifdef CONFIG_PSRAM_ENABLED
 
@@ -173,6 +173,12 @@ void init_software_sram(__unused bool is_bsp)
 }
 #endif
 
+/* @pre called after 'init_software_sram()' done. */
+bool is_software_sram_enabled(void)
+{
+	return is_sw_sram_initialized;
+}
+
 uint64_t get_software_sram_base(void)
 {
 	return software_sram_bottom_hpa;
diff --git a/hypervisor/common/hypercall.c b/hypervisor/common/hypercall.c
index 13e818165..03aee211a 100644
--- a/hypervisor/common/hypercall.c
+++ b/hypervisor/common/hypercall.c
@@ -575,7 +575,7 @@ static void add_vm_memory_region(struct acrn_vm *vm, struct acrn_vm *target_vm,
 	 * TODO: We can enforce WB for any region has overlap with Software SRAM, for simplicity,
 	 * and leave it to SOS to make sure it won't violate.
 	 */
-	if (is_sw_sram_initialized) {
+	if (is_software_sram_enabled()) {
 		base_paddr = get_software_sram_base();
 		if ((hpa >= base_paddr) &&
 			((hpa + region->size) <= (base_paddr + get_software_sram_size()))) {
diff --git a/hypervisor/include/arch/x86/rtcm.h b/hypervisor/include/arch/x86/rtcm.h
index 95959c6b8..239f9be0d 100644
--- a/hypervisor/include/arch/x86/rtcm.h
+++ b/hypervisor/include/arch/x86/rtcm.h
@@ -26,7 +26,7 @@ struct rtcm_header {
 	uint64_t command_offset;
 } __packed;
 
-extern volatile bool is_sw_sram_initialized;
 void init_software_sram(bool is_bsp);
 void set_rtct_tbl(void *rtct_tbl_addr);
+bool is_software_sram_enabled(void);
 #endif /* RTCM_H */