diff --git a/sys/arm64/arm64/vm_machdep.c b/sys/arm64/arm64/vm_machdep.c
index 4950fe8909c0..49c1af8e82b2 100644
--- a/sys/arm64/arm64/vm_machdep.c
+++ b/sys/arm64/arm64/vm_machdep.c
@@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/armreg.h>
 #include <machine/cpu.h>
+#include <machine/md_var.h>
 #include <machine/pcb.h>
 #include <machine/frame.h>
 
@@ -256,5 +257,6 @@ void
 swi_vm(void *v)
 {
 
-	/* Nothing to do here - busdma bounce buffers are not implemented. */
+	if (busdma_swi_pending != 0)
+		busdma_swi();
 }
diff --git a/sys/arm64/include/md_var.h b/sys/arm64/include/md_var.h
index d6cecfcd7941..07f816a13f24 100644
--- a/sys/arm64/include/md_var.h
+++ b/sys/arm64/include/md_var.h
@@ -41,6 +41,7 @@ extern int vm_page_dump_size;
 
 struct dumperinfo;
 
+extern int busdma_swi_pending;
 void busdma_swi(void);
 void dump_add_page(vm_paddr_t);
 void dump_drop_page(vm_paddr_t);