oeqa: Fix for QEMU_USE_KVM

Fixed:
MACHINE = "qemux86"
QEMU_USE_KVM = "qemux86"
IMAGE_CLASSES += "testimage"

$ oe-selftest -r runqemu.RunqemuTests.test_boot_rootfs

[snip]
  File "/buildarea1/lyang1/poky/meta/lib/oe/types.py", line 122, in boolean
    raise ValueError("Invalid boolean value '%s'" % value)
ValueError: Invalid boolean value 'qemux86'

Now QEMU_USE_KVM can only be boolean, can not contain MACHINE any more, kvm
will be enabled if target_arch == build_arch or both of them are x86 archs.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/meta/lib/oe/types.py b/meta/lib/oe/types.py
index f4017130df..1eebba5a38 100644
--- a/meta/lib/oe/types.py
+++ b/meta/lib/oe/types.py
@@ -156,3 +156,27 @@ def path(value, relativeto='', normalize='true', mustexist='false'):
                 raise ValueError("{0}: {1}".format(value, os.strerror(errno.ENOENT)))
 
     return value
+
+def is_x86(arch):
+    """
+    Check whether arch is x86 or x86_64
+    """
+    if arch.startswith('x86_') or re.match('i.*86', arch):
+        return True
+    else:
+        return False
+
+def qemu_use_kvm(kvm, target_arch):
+    """
+    Enable kvm if target_arch == build_arch or both of them are x86 archs.
+    """
+
+    use_kvm = False
+    if kvm and boolean(kvm):
+        build_arch = os.uname()[4]
+        if is_x86(build_arch) and is_x86(target_arch):
+            use_kvm = True
+        elif build_arch == target_arch:
+            use_kvm = True
+    return use_kvm
+