python/qemu: Move kvm_available() to its own module

This creates the 'accel' Python module to be the home for
utilities that deal with accelerators. Also moved kvm_available()
from __init__.py to this new module.

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20191216191438.93418-2-wainersm@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/python/qemu/accel.py b/python/qemu/accel.py
new file mode 100644
index 0000000000..cbeac10dd1
--- /dev/null
+++ b/python/qemu/accel.py
@@ -0,0 +1,31 @@
+"""
+QEMU accel module:
+
+This module provides utilities for discover and check the availability of
+accelerators.
+"""
+# Copyright (C) 2015-2016 Red Hat Inc.
+# Copyright (C) 2012 IBM Corp.
+#
+# Authors:
+#  Fam Zheng <famz@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2.  See
+# the COPYING file in the top-level directory.
+#
+
+import os
+
+# Mapping host architecture to any additional architectures it can
+# support which often includes its 32 bit cousin.
+ADDITIONAL_ARCHES = {
+    "x86_64" : "i386",
+    "aarch64" : "armhf"
+}
+
+def kvm_available(target_arch=None):
+    host_arch = os.uname()[4]
+    if target_arch and target_arch != host_arch:
+        if target_arch != ADDITIONAL_ARCHES.get(host_arch):
+            return False
+    return os.access("/dev/kvm", os.R_OK | os.W_OK)