Install qemu and create agl-egvirt machine feature

qemu is the userspace emulator needed to run KVM virtual machines.
This patch adds a bbappend for qemu in the meta-egvirt layer, and
includes it in the packages to be installed in the AGL distro.
To do this, the new agl-egvirt machine feature has been created
and is used to enable virtualization specific extensions
created by the EG-VIRT group for AGL.

In order to reduce its impact on the AGL image, the qemu targets
have been limited to aarch64 and x86_64 only.

Changelog v2:
- agl-egvirt added to MACHINE_FEATURES
- use of class_target to not create conflict by the QEMU version
  used in the SDK and the one used by KVM
- README file updated accordingly

Bug-AGL: SPEC-718

Change-Id: I27288382443ba2bfe14d574ade2e691a63da145d
Signed-off-by: Michele Paolino <m.paolino@virtualopensystems.com>

3 files changed, 13 insertions, 0 deletions

diff --git a/meta-egvirt/README.md b/meta-egvirt/README.md
index b6ba7a6a..15235ab9 100644
--- a/meta-egvirt/README.md
+++ b/meta-egvirt/README.md
@@ -13,6 +13,16 @@ depending on their availability and on the community interest.
 Maintainers:
 	Michele Paolino <m.paolino@virtualopensystems.com>
 
+
+How to enable agl virtualization feature
+------------------------------------------------------
+In order to enable the agl virtualization features (agl-egvirt),
+each supported board needs to add in one of its configuration
+files (see for instance meta-agl/meta-agl-bsp/conf/include)
+the following line:
+
+MACHINE_FEATURES += "agl-egvirt"
+
 References
 ------------------------------------------------------
 EG-VIRT wikipage:
diff --git a/meta-egvirt/conf/include/agl_egvirt.inc b/meta-egvirt/conf/include/agl_egvirt.inc
new file mode 100644
index 00000000..b4df5d8b
--- /dev/null
+++ b/meta-egvirt/conf/include/agl_egvirt.inc
@@ -0,0 +1,2 @@
+OVERRIDES .= "${@bb.utils.contains('MACHINE_FEATURES', 'agl-egvirt', ':aglegvirt', '', d)}"
+IMAGE_INSTALL_append_aglegvirt = " qemu "
diff --git a/meta-egvirt/recipes-core/qemu/qemu_2.%.bbappend b/meta-egvirt/recipes-core/qemu/qemu_2.%.bbappend
new file mode 100644
index 00000000..1a6a98b7
--- /dev/null
+++ b/meta-egvirt/recipes-core/qemu/qemu_2.%.bbappend
@@ -0,0 +1 @@
+QEMU_TARGETS_class-target_aglegvirt = " aarch64 x86_64"