diff --git a/devicemodel/core/main.c b/devicemodel/core/main.c
index 085619aaf..66577ce4b 100644
--- a/devicemodel/core/main.c
+++ b/devicemodel/core/main.c
@@ -652,28 +652,6 @@ num_vcpus_allowed(struct vmctx *ctx)
 	return VM_MAXCPU;
 }
 
-static struct vmctx *
-do_open(const char *vmname)
-{
-	struct vmctx *ctx;
-	int error;
-
-	error = vm_create(vmname);
-	if (error) {
-		perror("vm_create");
-		exit(1);
-
-	}
-
-	ctx = vm_open(vmname);
-	if (ctx == NULL) {
-		perror("vm_open");
-		exit(1);
-	}
-
-	return ctx;
-}
-
 static void
 sig_handler_term(int signo)
 {
@@ -901,12 +879,11 @@ main(int argc, char *argv[])
 	vmname = argv[0];
 
 	for (;;) {
-		ctx = do_open(vmname);
-
-		/* set IOReq buffer page */
-		error = vm_set_shared_io_page(ctx, (unsigned long)vhm_req_buf);
-		if (error)
-			goto fail;
+		ctx = vm_create(vmname, (unsigned long)vhm_req_buf);
+		if (!ctx) {
+			perror("vm_open");
+			exit(1);
+		}
 
 		if (guest_ncpus < 1) {
 			fprintf(stderr, "Invalid guest vCPUs (%d)\n",
@@ -997,7 +974,6 @@ main(int argc, char *argv[])
 		mevent_deinit();
 		vm_unsetup_memory(ctx);
 		vm_destroy(ctx);
-		vm_close(ctx);
 		_ctx = 0;
 
 		vm_set_suspend_mode(VM_SUSPEND_NONE);
@@ -1011,6 +987,5 @@ mevent_fail:
 	vm_unsetup_memory(ctx);
 fail:
 	vm_destroy(ctx);
-	vm_close(ctx);
 	exit(0);
 }
diff --git a/devicemodel/core/vmmapi.c b/devicemodel/core/vmmapi.c
index 63a426914..e732c7151 100644
--- a/devicemodel/core/vmmapi.c
+++ b/devicemodel/core/vmmapi.c
@@ -58,13 +58,6 @@
 #define SUPPORT_VHM_API_VERSION_MAJOR	1
 #define SUPPORT_VHM_API_VERSION_MINOR	0
 
-int
-vm_create(const char *name)
-{
-	/* TODO: specific part for vm create */
-	return 0;
-}
-
 static int
 check_api(int fd)
 {
@@ -92,7 +85,7 @@ check_api(int fd)
 static int devfd = -1;
 
 struct vmctx *
-vm_open(const char *name)
+vm_create(const char *name, uint64_t req_buf)
 {
 	struct vmctx *ctx;
 	struct acrn_create_vm create_vm;
@@ -138,6 +131,7 @@ vm_open(const char *name)
 	else
 		create_vm.vm_flag &= (~SECURE_WORLD_ENABLED);
 
+	create_vm.req_buf = req_buf;
 	while (retry > 0) {
 		error = ioctl(ctx->fd, IC_CREATE_VM, &create_vm);
 		if (error == 0)
@@ -160,33 +154,6 @@ err:
 	return NULL;
 }
 
-void
-vm_close(struct vmctx *ctx)
-{
-	if (!ctx)
-		return;
-
-	close(ctx->fd);
-	free(ctx);
-	devfd = -1;
-}
-
-int
-vm_set_shared_io_page(struct vmctx *ctx, uint64_t page_vma)
-{
-	int error;
-
-	error = ioctl(ctx->fd, IC_SET_IOREQ_BUFFER, page_vma);
-
-	if (error) {
-		fprintf(stderr, "failed to setup shared io page create VM %s\n",
-				ctx->name);
-		return -1;
-	}
-
-	return 0;
-}
-
 int
 vm_create_ioreq_client(struct vmctx *ctx)
 {
@@ -239,8 +206,13 @@ vm_notify_request_done(struct vmctx *ctx, int vcpu)
 void
 vm_destroy(struct vmctx *ctx)
 {
-	if (ctx)
-		ioctl(ctx->fd, IC_DESTROY_VM, NULL);
+	if (!ctx)
+		return;
+
+	ioctl(ctx->fd, IC_DESTROY_VM, NULL);
+	close(ctx->fd);
+	free(ctx);
+	devfd = -1;
 }
 
 int
diff --git a/devicemodel/include/public/acrn_common.h b/devicemodel/include/public/acrn_common.h
index dbe3fe93e..03ead291a 100644
--- a/devicemodel/include/public/acrn_common.h
+++ b/devicemodel/include/public/acrn_common.h
@@ -250,8 +250,10 @@ struct acrn_create_vm {
 	 */
 	uint64_t vm_flag;
 
+	uint64_t req_buf;
+
 	/** Reserved for future use*/
-	uint8_t  reserved2[24];
+	uint8_t  reserved2[16];
 } __aligned(8);
 
 /**
diff --git a/devicemodel/include/vmmapi.h b/devicemodel/include/vmmapi.h
index 299c5a8ad..f6bf8ee16 100644
--- a/devicemodel/include/vmmapi.h
+++ b/devicemodel/include/vmmapi.h
@@ -96,13 +96,10 @@ struct vm_isa_irq {
  */
 void	*vm_create_devmem(struct vmctx *ctx, int segid, const char *name,
 			  size_t len);
-int	vm_create(const char *name);
 int	vm_get_device_fd(struct vmctx *ctx);
-struct	vmctx *vm_open(const char *name);
-void	vm_close(struct vmctx *ctx);
+struct	vmctx *vm_create(const char *name, uint64_t req_buf);
 void	vm_pause(struct vmctx *ctx);
 void	vm_reset(struct vmctx *ctx);
-int	vm_set_shared_io_page(struct vmctx *ctx, uint64_t page_vma);
 int	vm_create_ioreq_client(struct vmctx *ctx);
 int	vm_destroy_ioreq_client(struct vmctx *ctx);
 int	vm_attach_ioreq_client(struct vmctx *ctx);