qemuboot-xilinx.bbclass: Rework qemu-xilinx setup

This change reworks how the meta-xilinx layer enables and provides the
custom version of QEMU based on Xilinx's fork of QEMU. The existing
implementation relied on the single sysroot which was changed in oe-core
such that now recipes have their own sysroots (RSS support).
Additionally oe-core now provides the QEMU binaries to the runqemu
script via the 'qemu-helper-native' recipes sysroot as opposed to the
image sysroot.

These rework changes allow for a single machine to select the targeted
QEMU version as well as to provide the qemuboot config specific to the
targeted QEMU version. The selection of QEMU version is now handled by
PREFERRED_PROVIDER mechanics with the meta-xilinx layer providing an
additional recipe that is equivalent to qemu-helper-native and which
also provides said target allowing for the machine to select via the use
of PREFERRED_PROVIDER_qemu-helper-native. This recipe
(qemu-xilinx-helper-native) however instead provides the sysroot
populated with qemu-xilinx instead of qemu.

Additionally the XILINX_QEMUBOOT variable is replaced with the
qemuboot-xilinx.bbclass, this provides the overrides for setting up
qemu-xilinx specific QB_* args. Additionally this bbclass points runqemu
at the qemu-xilinx-helper-native sysroot for QEMU binaries.

These changes also work towards making the meta-xilinx layer better
handle multiple qemuboot.conf variants as well as handling different
QEMU versions.

This change also removes the 'qemu-system-xilinx' MACHINE_FEATURES, this
is due to MACHINE_FEATURES no longer being available for native recipes.
Additionally there is no longer any logic that needs to know this any
way.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/recipes-devtools/qemu/qemu-xilinx-helper-native_1.0.bb b/recipes-devtools/qemu/qemu-xilinx-helper-native_1.0.bb
new file mode 100644
index 00000000..f04be960
--- /dev/null
+++ b/recipes-devtools/qemu/qemu-xilinx-helper-native_1.0.bb
@@ -0,0 +1,20 @@
+
+def get_filespath_extra(d, subpath):
+        metaroot = next((p for p in d.getVar('BBPATH').split(':') if os.path.basename(p) == 'meta'), None)
+        if metaroot:
+                return os.path.join(metaroot, subpath) + ":"
+        return ""
+
+# TODO: improve this, since it is very hacky that this recipe need to build tunctl.
+# include the existing qemu-helper-native
+require recipes-devtools/qemu/qemu-helper-native_1.0.bb
+# get the path to tunctl.c
+FILESEXTRAPATHS_prepend := "${@get_filespath_extra(d, 'recipes-devtools/qemu/qemu-helper')}"
+
+# provide it, to replace the existing
+PROVIDES += "qemu-helper-native"
+
+# replace qemu with qemu-xilinx
+DEPENDS_remove = "qemu-native"
+DEPENDS_append = " qemu-xilinx-native"
+