arm-autonomy: Create arm-autonomy-host feature

Create a new distribution feature to enable functionalities for autonomy
host systems:
- enable xen and ipv4 in distribution features
- enable xen backend drivers in Linux kernel using a kmeta feature

For the feature to work properly, create a class inherited when the
layer is included to enable required parameters

Change-Id: Ia0cdaa2b69bc030515ea16d67c47fec6b1ea0897
Issue-Id: SCM-767
Signed-off-by: Bertrand Marquis <bertrand.marquis@arm.com>
Reviewed-by: Diego Sueiro <diego.sueiro@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-autonomy/README.md

@@ -18,6 +18,11 @@ Distribution Features
 ---------------------
 This layer is adding the following Yocto DISTRO_FEATURES:
 
+* arm-autonomy-host: this feature activates functionalities required to build
+  an autonomy host system. It is doing the following:
+  - add 'xen' and 'ipv4' to DISTRO_FEATURES.
+  - add xen backend drivers to linux kernel configuration.
+
 Bitbake variables
 -----------------
 Some recipes and classes in this layer are introducing variables which can be

meta-arm-autonomy/classes/arm-autonomy-features.bbclass

@@ -0,0 +1,4 @@
+# Include arm-autonomy distro config files if the distro features are set
+
+require ${@bb.utils.contains('DISTRO_FEATURES', 'arm-autonomy-host', '${ARM_AUTONOMY_DISTRO_CFGDIR}/arm-autonomy-host.inc', '', d)}
+

meta-arm-autonomy/conf/distro/include/arm-autonomy-host.inc

@@ -0,0 +1,5 @@
+# This files is added when DISTRO_FEATURES contains arm-autonomy-host
+
+# We need to have xen and ipv4 activated
+DISTRO_FEATURES_append = " xen ipv4"
+

meta-arm-autonomy/conf/layer.conf

@@ -23,3 +23,9 @@ LAYERSERIES_COMPAT_meta-arm-autonomy = "zeus"
 # otherwise the user will see a warning on each build.
 SKIP_META_VIRT_SANITY_CHECK = "1"
 
+# Directory of our distro config files
+ARM_AUTONOMY_DISTRO_CFGDIR = "${LAYERDIR}/conf/distro/include/"
+
+# Add class to handle arm-autonomy distro extensions
+USER_CLASSES_append = " arm-autonomy-features"
+

meta-arm-autonomy/recipes-kernel/linux/arm-autonomy-kmeta/features/arm-autonomy/xen-host.cfg

@@ -0,0 +1,35 @@
+CONFIG_PARAVIRT=y
+CONFIG_XEN=y
+
+CONFIG_BLOCK=y
+CONFIG_XEN_BLKDEV_BACKEND=y
+
+CONFIG_SCSI=y
+CONFIG_TARGET_CORE=y
+CONFIG_XEN_SCSI_BACKEND=y
+
+CONFIG_NET=y
+CONFIG_XEN_NETDEV_BACKEND=y
+
+CONFIG_HVC_IRQ=y
+
+CONFIG_HVC_XEN=y
+
+CONFIG_WATCHDOG=y
+CONFIG_XEN_WDT=y
+
+CONFIG_XEN_BALLOON=y
+
+CONFIG_XEN_DEV_EVTCHN=y
+
+CONFIG_XENFS=y
+CONFIG_XEN_COMPAT_XENFS=y
+
+CONFIG_XEN_SYS_HYPERVISOR=y
+CONFIG_XEN_GNTDEV=y
+CONFIG_XEN_GRANT_DEV_ALLOC=y
+CONFIG_SWIOTLB_XEN=y
+
+CONFIG_XEN_EFI=y
+CONFIG_XEN_AUTO_XLATE=y
+

meta-arm-autonomy/recipes-kernel/linux/arm-autonomy-kmeta/features/arm-autonomy/xen-host.scc

@@ -0,0 +1,4 @@
+define KFEATURE_DESCRIPTION "Enable XEN Host Drivers on autonomy systems"
+
+kconf non-hardware xen-host.cfg
+

meta-arm-autonomy/recipes-kernel/linux/linux-%.bbappend

@@ -0,0 +1,3 @@
+# Add arm-autonomy kernel support
+require linux-arm-autonomy.inc
+

meta-arm-autonomy/recipes-kernel/linux/linux-arm-autonomy.inc

@@ -0,0 +1,13 @@
+# Add arm-autonomy specific features to the kernel
+
+FILESEXTRAPATHS_prepend := "${THISDIR}:"
+
+#
+# arm-autonomy kmeta
+#
+SRC_URI_append = " file://arm-autonomy-kmeta;type=kmeta;name=arm-autonomy-kmeta;destsuffix=arm-autonomy-kmeta"
+
+# Add xen host drivers to kernel if arm-autonomy-host is activated
+KERNEL_FEATURES += "${@bb.utils.contains('DISTRO_FEATURES', \
+        'arm-autonomy-host', 'features/arm-autonomy/xen-host.scc', '', d)}"
+