diff --git a/lib/libvmmapi/aarch64/vmmapi_machdep.c b/lib/libvmmapi/aarch64/vmmapi_machdep.c
--- a/lib/libvmmapi/aarch64/vmmapi_machdep.c
+++ b/lib/libvmmapi/aarch64/vmmapi_machdep.c
@@ -99,17 +99,14 @@
 }
 
 int
-vm_raise_msi(struct vmctx *ctx, uint64_t addr, uint64_t msg, int bus, int slot,
-    int func)
+vm_raise_msi(struct vmctx *ctx, uint64_t addr, uint64_t msg)
 {
 	struct vm_msi vmsi;
 
 	bzero(&vmsi, sizeof(vmsi));
 	vmsi.addr = addr;
 	vmsi.msg = msg;
-	vmsi.bus = bus;
-	vmsi.slot = slot;
-	vmsi.func = func;
+	/* Other fields are currently ignored. */
 
 	return (ioctl(ctx->fd, VM_RAISE_MSI, &vmsi));
 }
diff --git a/lib/libvmmapi/amd64/vmmapi_machdep.c b/lib/libvmmapi/amd64/vmmapi_machdep.c
--- a/lib/libvmmapi/amd64/vmmapi_machdep.c
+++ b/lib/libvmmapi/amd64/vmmapi_machdep.c
@@ -165,6 +165,12 @@
 	return (ioctl(ctx->fd, VM_LAPIC_MSI, &vmmsi));
 }
 
+int
+vm_raise_msi(struct vmctx *ctx, uint64_t addr, uint64_t msg)
+{
+	return (vm_lapic_msi(ctx, addr, msg));
+}
+
 int
 vm_apicid2vcpu(struct vmctx *ctx __unused, int apicid)
 {
diff --git a/lib/libvmmapi/vmmapi.h b/lib/libvmmapi/vmmapi.h
--- a/lib/libvmmapi/vmmapi.h
+++ b/lib/libvmmapi/vmmapi.h
@@ -158,17 +158,16 @@
 int	vm_run(struct vcpu *vcpu, struct vm_run *vmrun);
 int	vm_suspend(struct vmctx *ctx, enum vm_suspend_how how);
 int	vm_reinit(struct vmctx *ctx);
-int	vm_apicid2vcpu(struct vmctx *ctx, int apicid);
+int	vm_raise_msi(struct vmctx *ctx, uint64_t addr, uint64_t msg);
 #ifdef __aarch64__
 int	vm_attach_vgic(struct vmctx *ctx, uint64_t dist_start, size_t dist_size,
     uint64_t redist_start, size_t redist_size);
 int	vm_assert_irq(struct vmctx *ctx, uint32_t irq);
 int	vm_deassert_irq(struct vmctx *ctx, uint32_t irq);
-int	vm_raise_msi(struct vmctx *ctx, uint64_t addr, uint64_t msg, int bus,
-    int slot, int func);
 int	vm_inject_exception(struct vcpu *vcpu, uint64_t esr, uint64_t far);
 #endif
 #ifdef __amd64__
+int	vm_apicid2vcpu(struct vmctx *ctx, int apicid);
 int	vm_inject_exception(struct vcpu *vcpu, int vector,
     int errcode_valid, uint32_t errcode, int restart_instruction);
 int	vm_lapic_irq(struct vcpu *vcpu, int vector);