tests: Add support for testing KVM-based CPUs

This changeset adds support for initializing a KVM VM in the
BaseSystem test class and adds the following methods in run.py:

require_file -- Test if a file exists and abort/skip if not.
require_kvm -- Test if KVM support has been compiled into gem5 (i.e.,
	       BaseKvmCPU exists) and the KVM device exists on the
	       host.

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/configs/base_config.py b/tests/configs/base_config.py
index 370b76c46..b4c400a45 100644
--- a/tests/configs/base_config.py
+++ b/tests/configs/base_config.py
@@ -43,6 +43,8 @@ m5.util.addToPath('../configs/common')
 import FSConfig
 from Caches import *
 
+_have_kvm_support = 'BaseKvmCPU' in globals()
+
 class BaseSystem(object):
     """Base system builder.
 
@@ -111,6 +113,14 @@ class BaseSystem(object):
         """
         cpu.createInterruptController()
 
+    def init_kvm(self, system):
+        """Do KVM-specific system initialization.
+
+        Arguments:
+          system -- System to work on.
+        """
+        system.vm = KvmVM()
+
     def init_system(self, system):
         """Initialize a system.
 
@@ -119,6 +129,10 @@ class BaseSystem(object):
         """
         system.cpu = self.create_cpus()
 
+        if _have_kvm_support and \
+                any([isinstance(c, BaseKvmCPU) for c in system.cpu]):
+            self.init_kvm(system)
+
         sha_bus = self.create_caches_shared(system)
         for cpu in system.cpu:
             if not cpu.switched_out: