diff --git a/hypervisor/arch/riscv/Makefile b/hypervisor/arch/riscv/Makefile
index 451ecda32..1c49b8986 100644
--- a/hypervisor/arch/riscv/Makefile
+++ b/hypervisor/arch/riscv/Makefile
@@ -74,6 +74,7 @@ VP_C_SRCS += arch/riscv/guest/vsbi.c
 VP_C_SRCS += arch/riscv/guest/vsbi/vsbi_base.c
 VP_C_SRCS += arch/riscv/guest/vsbi/vsbi_hsm.c
 VP_C_SRCS += arch/riscv/guest/vsbi/vsbi_srst.c
+VP_C_SRCS += arch/riscv/guest/vsbi/vsbi_acrn.c
 
 VM_CFG_C_SRCS += $(SCENARIO_CFG_DIR)/vm_configurations.c
 VM_CFG_C_SRCS += $(BOARD_CFG_DIR)/pci_dev.c
diff --git a/hypervisor/arch/riscv/guest/vsbi.c b/hypervisor/arch/riscv/guest/vsbi.c
index d1e8ec6b5..b2dea252e 100644
--- a/hypervisor/arch/riscv/guest/vsbi.c
+++ b/hypervisor/arch/riscv/guest/vsbi.c
@@ -74,10 +74,12 @@ int32_t vsbi_exit_handler(struct acrn_vcpu *vcpu)
 extern const struct acrn_vsbi_extension vsbi_ext_base;
 extern const struct acrn_vsbi_extension vsbi_ext_hsm;
 extern const struct acrn_vsbi_extension vsbi_ext_srst;
+extern const struct acrn_vsbi_extension vsbi_ext_acrn;
 static const struct acrn_vsbi_extension *vsbi_extensions[MAX_NUM_SUPPORTED_VSBI_EXT] = {
 	&vsbi_ext_base,
 	&vsbi_ext_hsm,
 	&vsbi_ext_srst,
+	&vsbi_ext_acrn,
 };
 
 void init_vsbi(struct acrn_vm *vm)
diff --git a/hypervisor/arch/riscv/guest/vsbi/vsbi_acrn.c b/hypervisor/arch/riscv/guest/vsbi/vsbi_acrn.c
new file mode 100644
index 000000000..f442578d8
--- /dev/null
+++ b/hypervisor/arch/riscv/guest/vsbi/vsbi_acrn.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2018-2025 Intel Corporation.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <types.h>
+#include <vcpu.h>
+#include <vm.h>
+#include <per_cpu.h>
+
+#include <asm/sbi.h>
+#include <asm/guest/vsbi.h>
+
+static int32_t vcpu_sbi_acrn_ecall_handler(struct acrn_vcpu *vcpu, __unused uint64_t ext_id,
+			       uint64_t func_id, uint64_t *args, struct vsbi_ret *out)
+{
+	(void)vcpu;
+	(void)func_id;
+	(void)args;
+	(void)out;
+
+	/* TODO: Hypercall implementation goes here */
+
+	return 0;
+}
+
+static int32_t vsbi_acrn_probe(struct acrn_vm *vm)
+{
+	return is_service_vm(vm) ? 0 : -ENOSYS;
+}
+
+const struct acrn_vsbi_extension vsbi_ext_acrn = {
+	.name = "acrn",
+	.eid_start = SBI_EID_ACRN,
+	.eid_end = SBI_EID_ACRN,
+	.handler = vcpu_sbi_acrn_ecall_handler,
+	.probe = vsbi_acrn_probe,
+};
diff --git a/hypervisor/include/arch/riscv/asm/guest/vsbi.h b/hypervisor/include/arch/riscv/asm/guest/vsbi.h
index 6cec8467f..69a88829c 100644
--- a/hypervisor/include/arch/riscv/asm/guest/vsbi.h
+++ b/hypervisor/include/arch/riscv/asm/guest/vsbi.h
@@ -13,6 +13,13 @@
 
 #define MAX_VSBI_EXTENSION_NAME 16
 
+/* TODO: This ID is distributed by SBI.
+ * For now just hardcode a random value that isn't used.
+ * Change to official ID when ACRN gets an ID.
+ */
+#define SBI_ACRN_IMPL_ID	0x900
+#define SBI_EID_ACRN	(SBI_EID_FIRMWARE_START + SBI_ACRN_IMPL_ID)
+
 struct vsbi_ret {
 	uint64_t value;
 	bool vcpu_retain_pc;
diff --git a/hypervisor/include/arch/riscv/asm/sbi.h b/hypervisor/include/arch/riscv/asm/sbi.h
index 573d25a5f..3bb9f0793 100644
--- a/hypervisor/include/arch/riscv/asm/sbi.h
+++ b/hypervisor/include/arch/riscv/asm/sbi.h
@@ -29,6 +29,9 @@ enum sbi_eid  {
 	/* Vendor extensions must lie within this range */
 	SBI_EID_VENDOR_START = 0x09000000,
 	SBI_EID_VENDOR_END = 0x09FFFFFF,
+
+	SBI_EID_FIRMWARE_START = 0x0A000000,
+	SBI_EID_FIRMWARE_END = 0x0AFFFFFF,
 };
 
 #define SBI_BASE_FID_GET_SPEC_VERSION		0x0