diff --git a/hypervisor/arch/x86/pm.c b/hypervisor/arch/x86/pm.c
index 0cf95a63b..15bae78cc 100644
--- a/hypervisor/arch/x86/pm.c
+++ b/hypervisor/arch/x86/pm.c
@@ -14,119 +14,3 @@ void restore_msrs(void)
 	msr_write(MSR_IA32_FS_BASE, (uint64_t)psc);
 #endif
 }
-
-static void acpi_gas_write(struct acpi_generic_address *gas, uint32_t val)
-{
-	if (gas->space_id == SPACE_SYSTEM_MEMORY)
-		mmio_write_word(val, (void *)HPA2HVA(gas->address));
-	else
-		io_write_word(val, gas->address);
-}
-
-static uint32_t acpi_gas_read(struct acpi_generic_address *gas)
-{
-	uint32_t ret = 0;
-
-	if (gas->space_id == SPACE_SYSTEM_MEMORY)
-		ret = mmio_read_word((void *)HPA2HVA(gas->address));
-	else
-		ret = io_read_word(gas->address);
-
-	return ret;
-}
-
-void do_acpi_s3(struct vm *vm, uint32_t pm1a_cnt_val,
-	uint32_t pm1b_cnt_val)
-{
-	uint32_t s1, s2;
-
-	acpi_gas_write(&vm->pm.sx_state_data->pm1a_cnt, pm1a_cnt_val);
-
-	if (vm->pm.sx_state_data->pm1b_cnt.address != 0)
-		acpi_gas_write(&vm->pm.sx_state_data->pm1b_cnt, pm1b_cnt_val);
-
-	while (1) {
-		/* polling PM1 state register to detect wether
-		 * the Sx state enter is interrupted by wakeup event.
-		 */
-		s1 = s2 = 0;
-
-		s1 = acpi_gas_read(&vm->pm.sx_state_data->pm1a_evt);
-
-		if (vm->pm.sx_state_data->pm1b_evt.address != 0) {
-			s2 = acpi_gas_read(&vm->pm.sx_state_data->pm1b_evt);
-			s1 |= s2;
-		}
-
-		/* According to ACPI spec 4.8.3.1.1 PM1 state register, the bit
-		 * WAK_STS(bit 15) is set if system will transition to working
-		 * state.
-		 */
-		if ((s1 & (1 << BIT_WAK_STS)) != 0)
-			break;
-	}
-}
-
-int enter_s3(struct vm *vm, uint32_t pm1a_cnt_val,
-	uint32_t pm1b_cnt_val)
-{
-	uint32_t pcpu_id;
-	uint64_t pmain_entry_saved;
-	uint64_t *pmain_entry;
-
-	if (vm->pm.sx_state_data == NULL) {
-		pr_err("No Sx state info avaiable. No Sx support");
-		return -1;
-	}
-
-	pause_vm(vm);	/* pause vm0 before suspend system */
-
-	pcpu_id = get_cpu_id();
-
-	/* offline all APs */
-	stop_cpus();
-
-	/* Trampoline code is relocatable now. We have to calculate
-	 * main_entry address with relocation base address
-	 */
-	pmain_entry =
-		(uint64_t *)(HPA2HVA(trampoline_start16_paddr) +
-		(uint64_t) main_entry);
-
-	/* Save default main entry and we will restore it after
-	 * back from S3. So the AP online could jmp to correct
-	 * main entry.
-	 */
-	pmain_entry_saved = *pmain_entry;
-	/* Set the main entry for resume from S3 state */
-	*pmain_entry = (uint64_t)restore_s3_context;
-
-	CPU_IRQ_DISABLE();
-	vmx_off(pcpu_id);
-
-	suspend_console();
-	suspend_ioapic();
-	suspend_iommu();
-	suspend_lapic();
-
-	__enter_s3(vm, pm1a_cnt_val, pm1b_cnt_val);
-
-	/* release the lock aquired in trampoline code */
-	spinlock_release(&trampoline_spinlock);
-
-	resume_lapic();
-	resume_iommu();
-	resume_ioapic();
-	resume_console();
-
-	exec_vmxon_instr(pcpu_id);
-	CPU_IRQ_ENABLE();
-
-	/* restore the default main entry */
-	*pmain_entry = pmain_entry_saved;
-
-	/* online all APs again */
-	start_cpus();
-
-	return 0;
-}
diff --git a/hypervisor/arch/x86/wakeup.S b/hypervisor/arch/x86/wakeup.S
index c22cd1811..59dc5c9eb 100644
--- a/hypervisor/arch/x86/wakeup.S
+++ b/hypervisor/arch/x86/wakeup.S
@@ -3,7 +3,6 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 #include <vcpu.h>
-#include <spinlock.h>
 
    .text
    .align   8
@@ -11,8 +10,6 @@
    .extern    restore_msrs
    .extern    cpu_ctx
    .extern    load_gdtr_and_tr
-   .extern    do_acpi_s3
-   .extern    trampoline_spinlock
 
    .global    __enter_s3
 __enter_s3:
@@ -50,18 +47,7 @@ __enter_s3:
 
 	wbinvd
 
-	movq CPU_CONTEXT_OFFSET_RDX + cpu_ctx(%rip), %rdx  /* pm1b_cnt_val */
-	movq CPU_CONTEXT_OFFSET_RDI + cpu_ctx(%rip), %rdi  /* *vm */
-	movq CPU_CONTEXT_OFFSET_RSI + cpu_ctx(%rip), %rsi  /* pm1a_cnt_val */
-
-	call do_acpi_s3
-
-	/* if do_acpi_s3 returns, which means ACRN can't enter S3 state.
-	 * Then trampoline will not be executed and we need to acquire
-	 * trampoline_spinlock here to match release in enter_sleep
-	 */
-	mov $trampoline_spinlock, %rdi
-	spinlock_obtain(%rdi)
+	/* Will add the function call to enter Sx here*/
 
 
 /*
diff --git a/hypervisor/include/arch/x86/host_pm.h b/hypervisor/include/arch/x86/host_pm.h
index f5fc7eae8..98466f47b 100644
--- a/hypervisor/include/arch/x86/host_pm.h
+++ b/hypervisor/include/arch/x86/host_pm.h
@@ -5,10 +5,6 @@
 
 #ifndef	HOST_PM_H
 
-#define	BIT_WAK_STS	15U
-
-int enter_s3(struct vm *vm, uint32_t pm1a_cnt_val,
-		uint32_t pm1b_cnt_val);
 extern void __enter_s3(struct vm *vm, uint32_t pm1a_cnt_val,
 		uint32_t pm1b_cnt_val);
 extern void restore_s3_context(void);