kvmtool: add script for updating kernel headers

From time to time (when new KVM kernel features get enabled in kvmtool),
we need to update the public kernel headers from a recent Linux tree.
Provide a script that makes sure we get the right files and that also
covers every architecture.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/util/update_headers.sh b/util/update_headers.sh
new file mode 100755
index 00000000..2d936468
--- /dev/null
+++ b/util/update_headers.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+########################################################################
+# Updates the kvmtool tree with up-to-date public header files from
+# a Linux source tree.
+# If no directory is given on the command line, it will try to find one
+# using the lib/modules/`uname -r`/source link.
+########################################################################
+
+if [ "$#" -ge 1 ]
+then
+	LINUX_ROOT="$1"
+else
+	LINUX_ROOT=/lib/modules/$(uname -r)/source
+fi
+
+if [ ! -d $LINUX_ROOT/include/uapi/linux ]
+then
+	echo "$LINUX_ROOT does not seem to be valid Linux source tree."
+	echo "usage: $0 [path-to-Linux-source-tree]"
+	exit 1
+fi
+
+cp $LINUX_ROOT/include/uapi/linux/kvm.h include/linux
+
+for arch in arm arm64 mips powerpc x86
+do
+	case "$arch" in
+		arm) KVMTOOL_PATH=arm/aarch32 ;;
+		arm64) KVMTOOL_PATH=arm/aarch64 ;;
+		*) KVMTOOL_PATH=$arch ;;
+	esac
+	cp $LINUX_ROOT/arch/$arch/include/uapi/asm/kvm.h \
+		$KVMTOOL_PATH/include/asm
+done