diff --git a/verif/regress/benchmark.sh b/verif/regress/benchmark.sh
index 955f29d912..282bafdec9 100644
--- a/verif/regress/benchmark.sh
+++ b/verif/regress/benchmark.sh
@@ -13,16 +13,18 @@ if [ -z "$RISCV" ]; then
   return
 fi
 
+if [ -z "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=veri-testharness,spike
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
 
-if [ -z "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=veri-testharness,spike
-fi
-
 if [ -z "$DV_TARGET" ]; then
   DV_TARGET=cv64a6_imafdc_sv39
 fi
diff --git a/verif/regress/coremark.sh b/verif/regress/coremark.sh
index 225b5f033b..b21ec7e86b 100644
--- a/verif/regress/coremark.sh
+++ b/verif/regress/coremark.sh
@@ -18,16 +18,18 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-uvm
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm
-fi
-
 if ! [ -n "$DV_HWCONFIG_OPTS" ]; then
   DV_HWCONFIG_OPTS="cv32a65x"
 fi
diff --git a/verif/regress/cv32a6_tests.sh b/verif/regress/cv32a6_tests.sh
index 03496d4a3e..0af6cc0231 100644
--- a/verif/regress/cv32a6_tests.sh
+++ b/verif/regress/cv32a6_tests.sh
@@ -14,9 +14,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-testharness,spike
+fi
 
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 # install the required test suites
@@ -27,10 +32,6 @@ source ./verif/sim/setup-env.sh
 
 echo "$SPIKE_INSTALL_DIR$"
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-testharness,spike
-fi
-
 if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv32a65x
 fi
diff --git a/verif/regress/cv64a6_imafdc_tests.sh b/verif/regress/cv64a6_imafdc_tests.sh
index 015e43b7ad..e5164f40e6 100644
--- a/verif/regress/cv64a6_imafdc_tests.sh
+++ b/verif/regress/cv64a6_imafdc_tests.sh
@@ -17,9 +17,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-testharness,spike
+fi
 
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 # install the required test suites
@@ -30,10 +35,6 @@ source ./verif/sim/setup-env.sh
 
 echo "$SPIKE_INSTALL_DIR$"
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-testharness,spike
-fi
-
 if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv64a6_imafdc_sv39_hpdcache
 fi
diff --git a/verif/regress/cvxif_verif_regression.sh b/verif/regress/cvxif_verif_regression.sh
index 224a770e26..4d7b9e6503 100644
--- a/verif/regress/cvxif_verif_regression.sh
+++ b/verif/regress/cvxif_verif_regression.sh
@@ -14,8 +14,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-testharness,spike
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 # setup sim env
@@ -23,10 +29,6 @@ source ./verif/sim/setup-env.sh
 
 echo "$SPIKE_INSTALL_DIR$"
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-testharness,spike
-fi
-
 if ! [ -n "$UVM_VERBOSITY" ]; then
     export UVM_VERBOSITY=UVM_NONE
 fi
diff --git a/verif/regress/dhrystone.sh b/verif/regress/dhrystone.sh
index 72f3dbcb27..160608a290 100644
--- a/verif/regress/dhrystone.sh
+++ b/verif/regress/dhrystone.sh
@@ -13,16 +13,18 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-uvm
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm
-fi
-
 if ! [ -n "$DV_HWCONFIG_OPTS" ]; then
   DV_HWCONFIG_OPTS="cv32a65x"
 fi
diff --git a/verif/regress/dhrystone_smoke.sh b/verif/regress/dhrystone_smoke.sh
index 5f0f332fa8..f1238cb805 100644
--- a/verif/regress/dhrystone_smoke.sh
+++ b/verif/regress/dhrystone_smoke.sh
@@ -13,16 +13,18 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-uvm
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm
-fi
-
 make clean
 make -C verif/sim clean_all
 
diff --git a/verif/regress/dv-csr-embedded-tests.sh b/verif/regress/dv-csr-embedded-tests.sh
index 277c8f395b..0e091230bd 100644
--- a/verif/regress/dv-csr-embedded-tests.sh
+++ b/verif/regress/dv-csr-embedded-tests.sh
@@ -13,8 +13,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-uvm,spike
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
@@ -26,10 +32,6 @@ if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv32a65x
 fi
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm,spike
-fi
-
 cd verif/sim/
 python3 cva6.py --testlist=../tests/testlist_csr_embedded.yaml --iss_yaml cva6.yaml --target $DV_TARGET --iss=$DV_SIMULATORS $DV_OPTS --priv=m --iss_timeout 600 --linker=../../config/gen_from_riscv_config/$DV_TARGET/linker/link.ld
 
diff --git a/verif/regress/dv-generated-tests.sh b/verif/regress/dv-generated-tests.sh
index 62f3bcf0b8..36eff7eeeb 100644
--- a/verif/regress/dv-generated-tests.sh
+++ b/verif/regress/dv-generated-tests.sh
@@ -18,7 +18,6 @@ if ! [ -n "$RISCV" ]; then
 fi
 
 # install the required tools
-source ./verif/regress/install-verilator.sh
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
@@ -27,10 +26,6 @@ if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv32a65x
 fi
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm,spike
-fi
-
 if ! [ -n "$list_num" ]; then
   list_num=1 #default test list
 fi
diff --git a/verif/regress/dv-generated-xif-tests.sh b/verif/regress/dv-generated-xif-tests.sh
index 0405ee4910..0476e5b56d 100644
--- a/verif/regress/dv-generated-xif-tests.sh
+++ b/verif/regress/dv-generated-xif-tests.sh
@@ -18,7 +18,6 @@ if ! [ -n "$RISCV" ]; then
 fi
 
 # install the required tools
-source ./verif/regress/install-verilator.sh
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
@@ -27,10 +26,6 @@ if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv32a65x
 fi
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm,spike
-fi
-
 if ! [ -n "$list_num" ]; then
   list_num=1 #default test list
 fi
diff --git a/verif/regress/dv-riscv-tests.sh b/verif/regress/dv-riscv-tests.sh
index 4cf86d38ed..913244c9ca 100755
--- a/verif/regress/dv-riscv-tests.sh
+++ b/verif/regress/dv-riscv-tests.sh
@@ -13,8 +13,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=veri-testharness,spike
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 source verif/regress/install-riscv-tests.sh
 
@@ -24,10 +30,6 @@ if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv64a6_imafdc_sv39
 fi
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=veri-testharness,spike
-fi
-
 if ! [ -n "$DV_TESTLISTS" ]; then
   DV_TESTLISTS="../tests/testlist_riscv-tests-$DV_TARGET-p.yaml \
                 ../tests/testlist_riscv-tests-$DV_TARGET-v.yaml"
diff --git a/verif/regress/hwconfig_tests.sh b/verif/regress/hwconfig_tests.sh
index cdbfafb2d3..8fbf0cd8ae 100644
--- a/verif/regress/hwconfig_tests.sh
+++ b/verif/regress/hwconfig_tests.sh
@@ -13,16 +13,18 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-uvm
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source ./verif/sim/setup-env.sh
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm
-fi
-
 if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv32a65x
 fi
diff --git a/verif/regress/smoke-gen_tests.sh b/verif/regress/smoke-gen_tests.sh
index 6f820180a9..1895dd7fb9 100644
--- a/verif/regress/smoke-gen_tests.sh
+++ b/verif/regress/smoke-gen_tests.sh
@@ -17,8 +17,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-uvm
+fi
+
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 source verif/sim/setup-env.sh
@@ -27,10 +33,6 @@ if ! [ -n "$DV_TARGET" ]; then
   DV_TARGET=cv32a65x
 fi
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-uvm
-fi
-
 cd verif/sim/
 cp ../env/corev-dv/custom/riscv_custom_instr_enum.sv ./dv/src/isa/custom/
 python3 cva6.py --testlist=cva6_base_testlist.yaml --test riscv_arithmetic_basic_test_comp --iss_yaml cva6.yaml --target $DV_TARGET -cs ../env/corev-dv/target/rv32imcb/ --mabi ilp32 --isa rv32imc --isa_extension="zba,zbb,zbc,zbs,zcb" --simulator_yaml ../env/corev-dv/simulator.yaml --iss=$DV_SIMULATORS $DV_OPTS --priv=m -i 1 --iss_timeout 300
diff --git a/verif/regress/smoke-tests-cv32a65x.sh b/verif/regress/smoke-tests-cv32a65x.sh
index 994415c419..cc1d8a37b7 100644
--- a/verif/regress/smoke-tests-cv32a65x.sh
+++ b/verif/regress/smoke-tests-cv32a65x.sh
@@ -13,8 +13,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-testharness,spike
+fi
 
 # install the required tools
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 # setup sim env
@@ -22,10 +28,6 @@ source ./verif/sim/setup-env.sh
 
 echo "$SPIKE_INSTALL_DIR$"
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-testharness,spike
-fi
-
 if ! [ -n "$UVM_VERBOSITY" ]; then
     export UVM_VERBOSITY=UVM_NONE
 fi
diff --git a/verif/regress/smoke-tests-cv32a6_imac_sv32.sh b/verif/regress/smoke-tests-cv32a6_imac_sv32.sh
index 3b18f911e1..6b6d4217d2 100644
--- a/verif/regress/smoke-tests-cv32a6_imac_sv32.sh
+++ b/verif/regress/smoke-tests-cv32a6_imac_sv32.sh
@@ -13,9 +13,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-testharness,spike
+fi
 
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 # install the required test suites
@@ -28,10 +33,6 @@ source ./verif/sim/setup-env.sh
 
 echo "$SPIKE_INSTALL_DIR$"
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-testharness,spike
-fi
-
 if ! [ -n "$UVM_VERBOSITY" ]; then
     export UVM_VERBOSITY=UVM_NONE
 fi
diff --git a/verif/regress/smoke-tests-cv64a6_imafdc_sv39.sh b/verif/regress/smoke-tests-cv64a6_imafdc_sv39.sh
index 8b09a0ba3a..d60ce010d2 100644
--- a/verif/regress/smoke-tests-cv64a6_imafdc_sv39.sh
+++ b/verif/regress/smoke-tests-cv64a6_imafdc_sv39.sh
@@ -13,9 +13,14 @@ if ! [ -n "$RISCV" ]; then
   return
 fi
 
+if ! [ -n "$DV_SIMULATORS" ]; then
+  DV_SIMULATORS=vcs-testharness,spike
+fi
 
 # install the required tools
-source ./verif/regress/install-verilator.sh
+if [[ "$DV_SIMULATORS" == *"veri-testharness"* ]]; then
+  source ./verif/regress/install-verilator.sh
+fi
 source ./verif/regress/install-spike.sh
 
 # install the required test suites
@@ -28,10 +33,6 @@ source ./verif/sim/setup-env.sh
 
 echo "$SPIKE_INSTALL_DIR$"
 
-if ! [ -n "$DV_SIMULATORS" ]; then
-  DV_SIMULATORS=vcs-testharness,spike
-fi
-
 if ! [ -n "$UVM_VERBOSITY" ]; then
     export UVM_VERBOSITY=UVM_NONE
 fi