tests: Add enable_dvm flag to test DVM in long regressions

We are only adding the option to the LinuxArmFSSystem and not to the
LinuxArmFSSystemUniprocessor as DVM is only supported for more than one
CPU

Change-Id: I57004b85158fb898297fb9d91c38673a5bb88268
Signed-off-by: Giacomo Travaglini <[email protected]>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59870
Reviewed-by: Jason Lowe-Power <[email protected]>
Maintainer: Jason Lowe-Power <[email protected]>
Tested-by: kokoro <[email protected]>

tests/gem5/configs/arm_generic.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2012, 2017, 2019 ARM Limited
+# Copyright (c) 2012, 2017, 2019, 2022 Arm Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -71,18 +71,19 @@ class LinuxArmSystemBuilder(object):
     ARM-specific create_system method to a class deriving from one of
     the generic base systems.
     """
-    def __init__(self, machine_type, aarch64_kernel, **kwargs):
+    def __init__(self, machine_type, aarch64_kernel, enable_dvm, **kwargs):
         """
         Arguments:
           machine_type -- String describing the platform to simulate
           num_cpus -- integer number of CPUs in the system
           use_ruby -- True if ruby is used instead of the classic memory system
         """
         self.machine_type = machine_type
+        self.aarch64_kernel = aarch64_kernel
+        self.enable_dvm = enable_dvm
         self.num_cpus = kwargs.get('num_cpus', 1)
         self.mem_size = kwargs.get('mem_size', '256MB')
         self.use_ruby = kwargs.get('use_ruby', False)
-        self.aarch64_kernel = aarch64_kernel
 
     def init_kvm(self, system):
         """Do KVM-specific system initialization.
@@ -133,6 +134,10 @@ def create_system(self):
                     default_kernels[self.machine_type])
 
         self.init_system(system)
+        if self.enable_dvm:
+            for cpu in system.cpu:
+                for decoder in cpu.decoder:
+                    decoder.dvm_enabled = True
 
         system.workload.dtb_filename = \
             os.path.join(m5.options.outdir, 'system.dtb')
@@ -146,6 +151,7 @@ class LinuxArmFSSystem(LinuxArmSystemBuilder,
     def __init__(self,
                  machine_type='VExpress_GEM5_Foundation',
                  aarch64_kernel=True,
+                 enable_dvm=False,
                  **kwargs):
         """Initialize an ARM system that supports full system simulation.
 
@@ -157,7 +163,7 @@ def __init__(self,
         """
         BaseFSSystem.__init__(self, **kwargs)
         LinuxArmSystemBuilder.__init__(
-            self, machine_type, aarch64_kernel, **kwargs)
+            self, machine_type, aarch64_kernel, enable_dvm, **kwargs)
 
     def create_caches_private(self, cpu):
         # Use the more representative cache configuration
@@ -180,7 +186,7 @@ def __init__(self,
                  **kwargs):
         BaseFSSystemUniprocessor.__init__(self, **kwargs)
         LinuxArmSystemBuilder.__init__(
-            self, machine_type, aarch64_kernel, **kwargs)
+            self, machine_type, aarch64_kernel, False, **kwargs)
 
 class LinuxArmFSSwitcheroo(LinuxArmSystemBuilder, BaseFSSwitcheroo):
     """Uniprocessor ARM system prepared for CPU switching"""
@@ -191,4 +197,4 @@ def __init__(self,
                  **kwargs):
         BaseFSSwitcheroo.__init__(self, **kwargs)
         LinuxArmSystemBuilder.__init__(
-            self, machine_type, aarch64_kernel, **kwargs)
+            self, machine_type, aarch64_kernel, False, **kwargs)