config: Move KVM CPU checking to CpuConfig helper module

Both se.py and fs.py need to check if a CPU is a KVM CPU. This is
somewhat involved since CPUs can be disabled at compile time. Enable
better code reuse by moving it to the CpuConfig module.

Change-Id: I47b1512ecb62e757399a407a0e41be83b9f83be3
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/12418
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/configs/common/CpuConfig.py b/configs/common/CpuConfig.py
index 3f193ae60..d70e6cfa7 100644
--- a/configs/common/CpuConfig.py
+++ b/configs/common/CpuConfig.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2012, 2017 ARM Limited
+# Copyright (c) 2012, 2017-2018 ARM Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -59,6 +59,17 @@ def is_cpu_class(cls):
     except (TypeError, AttributeError):
         return False
 
+def _cpu_subclass_tester(name):
+    cpu_class = getattr(m5.objects, name, None)
+
+    def tester(cls):
+        return cpu_class is not None and cls is not None and \
+            issubclass(cls, cpu_class)
+
+    return tester
+
+is_kvm_cpu = _cpu_subclass_tester("BaseKvmCPU")
+
 def get(name):
     """Get a CPU class from a user provided class name or alias."""