diff --git a/difftest/difftest.cc b/difftest/difftest.cc
index 0e44cae59..20ed5d26c 100644
--- a/difftest/difftest.cc
+++ b/difftest/difftest.cc
@@ -400,6 +400,10 @@ bool DifftestRef::raise_critical_error() {
   return state->critical_error;
 }
 
+void DifftestRef::dirty_fsvs(uint64_t dirties) {
+  state->sstatus->dirty(dirties);
+}
+
 void DifftestRef::update_mip(void *non_reg_interrupt_pending) {
   auto n = (DifftestNonRegInterruptPending *) non_reg_interrupt_pending;
   state->mip->backdoor_write_with_mask(MIP_MTIP, n->platform_irp_mtip ? MIP_MTIP : 0);
@@ -574,6 +578,10 @@ void difftest_raise_intr(uint64_t NO) {
   ref->raise_intr(NO);
 }
 
+void difftest_dirty_fsvs(uint64_t dirties) {
+  ref->dirty_fsvs(dirties);
+}
+
 bool difftest_raise_critical_error() {
   return ref->raise_critical_error();
 }
diff --git a/difftest/difftest.h b/difftest/difftest.h
index 22ec17493..15d3eea11 100644
--- a/difftest/difftest.h
+++ b/difftest/difftest.h
@@ -143,6 +143,7 @@ class DifftestRef {
   int store_commit(uint64_t *addr, uint64_t *data, uint8_t *mask);
   void raise_intr(uint64_t no);
   bool raise_critical_error();
+  void dirty_fsvs(uint64_t dirties);
   void display();
   void update_mip(void *non_reg_interrupt_pending);
   void update_dynamic_config(void* config) {