xen: apply layer settings when xen DISTRO_FEATURE is enabled

These settings are necessary for Xen and enabling them here, using the
same mechanism that is used by k8s in this layer, simplifies building
images for Xen.

- Ensure that Xen mode is enabled in QEMU.
- On ARM platforms: enable Flattened Device Tree (FDT) support.

Signed-off-by: Christopher Clark <christopher.w.clark@gmail.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/classes/meta-virt-xen-cfg.bbclass b/classes/meta-virt-xen-cfg.bbclass
new file mode 100644
index 00000000..61b32aa3
--- /dev/null
+++ b/classes/meta-virt-xen-cfg.bbclass
@@ -0,0 +1,6 @@
+# We need to load the Xen meta-virt config components, only if "xen"
+# is in the distro features.  Since we don't know the distro flags during
+# layer.conf load time, we delay using a special bbclass that simply includes
+# the META_VIRT_XEN_CONFIG_PATH file.
+
+include ${@bb.utils.contains('DISTRO_FEATURES', 'xen', '${META_VIRT_XEN_CONFIG_PATH}', '', d)}