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qemu/scripts/update-linux-headers.sh
Paolo Bonzini ef7c70f020 update-linux-headers: fix forwarding to asm-generic headers 
Afer commit 3efc75ad9d ("scripts/update-linux-headers.sh: Remove
temporary directory inbetween", 2024-05-29), updating linux-headers/
results in errors such as

   cp: cannot stat '/tmp/tmp.1A1Eejh1UE/headers/include/asm/bitsperlong.h': No such file or directory

because Loongarch does not have an asm/bitsperlong.h file and uses the
generic version.  Before commit 3efc75ad9d, the missing file would
incorrectly cause stale files to be included in linux-headers/.  The files
were never committed to qemu.git, but were wrong nevertheless. The build
would just use the system version of the files, which is opposite to
the idea of importing Linux header files into QEMU's tree.

Create forwarding headers, resembling the ones that are generated during a
kernel build by scripts/Makefile.asm-generic, if a file is only installed
under include/asm-generic/.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-06-05 11:01:05 +02:00

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#!/bin/sh -e
#
# Update Linux kernel headers QEMU requires from a specified kernel tree.
#
# Copyright (C) 2011 Siemens AG
#
# Authors:
# Jan Kiszka <jan.kiszka@siemens.com>
#
# This work is licensed under the terms of the GNU GPL version 2.
# See the COPYING file in the top-level directory.
#
# The script will copy the headers into two target folders:
#
# - linux-headers/ for files that are required for compiling for a
# Linux host. Generally we have these so we can use kernel structs
# and defines that are more recent than the headers that might be
# installed on the host system. Usually this script can do simple
# file copies for these headers.
#
# - include/standard-headers/ for files that are used for guest
# device emulation and are required on all hosts. For instance, we
# get our definitions of the virtio structures from the Linux
# kernel headers, but we need those definitions regardless of which
# host OS we are building for. This script has to be careful to
# sanitize the headers to remove any use of Linux-specifics such as
# types like "__u64". This work is done in the cp_portable function.
tmpdir=$(mktemp -d)
hdrdir="$tmpdir/headers"
blddir="$tmpdir/build"
linux="$1"
output="$2"
if [ -z "$linux" ] || ! [ -d "$linux" ]; then
cat << EOF
usage: update-kernel-headers.sh LINUX_PATH [OUTPUT_PATH]
LINUX_PATH Linux kernel directory to obtain the headers from
OUTPUT_PATH output directory, usually the qemu source tree (default: $PWD)
EOF
exit 1
fi
if [ -z "$output" ]; then
output="$PWD"
fi
cp_portable() {
f=$1
to=$2
if
grep '#include' "$f" | grep -v -e 'linux/virtio' \
-e 'linux/types' \
-e 'linux/ioctl' \
-e 'stdint' \
-e 'linux/if_ether' \
-e 'input-event-codes' \
-e 'sys/' \
-e 'drm.h' \
-e 'limits' \
-e 'linux/const' \
-e 'linux/kernel' \
-e 'linux/sysinfo' \
-e 'asm/setup_data.h' \
> /dev/null
then
echo "Unexpected #include in input file $f".
exit 2
fi
header=$(basename "$f");
sed -e 's/__aligned_u64/__u64 __attribute__((aligned(8)))/g' \
-e 's/__u\([0-9][0-9]*\)/uint\1_t/g' \
-e 's/u\([0-9][0-9]*\)/uint\1_t/g' \
-e 's/__s\([0-9][0-9]*\)/int\1_t/g' \
-e 's/__le\([0-9][0-9]*\)/uint\1_t/g' \
-e 's/__be\([0-9][0-9]*\)/uint\1_t/g' \
-e 's/"\(input-event-codes\.h\)"/"standard-headers\/linux\/\1"/' \
-e 's/<linux\/\([^>]*\)>/"standard-headers\/linux\/\1"/' \
-e 's/<asm\/\([^>]*\)>/"standard-headers\/asm-'$arch'\/\1"/' \
-e 's/__bitwise//' \
-e 's/__attribute__((packed))/QEMU_PACKED/' \
-e 's/__inline__/inline/' \
-e 's/__BITS_PER_LONG/HOST_LONG_BITS/' \
-e '/\"drm.h\"/d' \
-e '/sys\/ioctl.h/d' \
-e '/linux\/ioctl.h/d' \
-e 's/SW_MAX/SW_MAX_/' \
-e 's/atomic_t/int/' \
-e 's/__kernel_long_t/long/' \
-e 's/__kernel_ulong_t/unsigned long/' \
-e 's/struct ethhdr/struct eth_header/' \
-e '/\#define _LINUX_ETHTOOL_H/a \\n\#include "net/eth.h"' \
"$f" > "$to/$header";
}
# This will pick up non-directories too (eg "Kconfig") but we will
# ignore them in the next loop.
ARCHLIST=$(cd "$linux/arch" && echo *)
for arch in $ARCHLIST; do
# Discard anything which isn't a KVM-supporting architecture
if ! [ -e "$linux/arch/$arch/include/asm/kvm.h" ] &&
! [ -e "$linux/arch/$arch/include/uapi/asm/kvm.h" ] ; then
continue
fi
if [ "$arch" = x86 ]; then
arch_var=SRCARCH
else
arch_var=ARCH
fi
rm -rf "$hdrdir"
make -C "$linux" O="$blddir" INSTALL_HDR_PATH="$hdrdir" $arch_var=$arch headers_install
rm -rf "$output/linux-headers/asm-$arch"
mkdir -p "$output/linux-headers/asm-$arch"
for header in kvm.h unistd.h bitsperlong.h mman.h; do
if test -f "$hdrdir/include/asm/$header"; then
cp "$hdrdir/include/asm/$header" "$output/linux-headers/asm-$arch"
elif test -f "$hdrdir/include/asm-generic/$header"; then
# not installed as <asm/$header>, but used as such in kernel sources
cat <<EOF >$output/linux-headers/asm-$arch/$header
#include <asm-generic/$header>
EOF
fi
done
if [ $arch = mips ]; then
cp "$hdrdir/include/asm/sgidefs.h" "$output/linux-headers/asm-mips/"
cp "$hdrdir/include/asm/unistd_o32.h" "$output/linux-headers/asm-mips/"
cp "$hdrdir/include/asm/unistd_n32.h" "$output/linux-headers/asm-mips/"
cp "$hdrdir/include/asm/unistd_n64.h" "$output/linux-headers/asm-mips/"
fi
if [ $arch = powerpc ]; then
cp "$hdrdir/include/asm/unistd_32.h" "$output/linux-headers/asm-powerpc/"
cp "$hdrdir/include/asm/unistd_64.h" "$output/linux-headers/asm-powerpc/"
fi
rm -rf "$output/include/standard-headers/asm-$arch"
mkdir -p "$output/include/standard-headers/asm-$arch"
if [ $arch = s390 ]; then
cp_portable "$hdrdir/include/asm/virtio-ccw.h" "$output/include/standard-headers/asm-s390/"
cp "$hdrdir/include/asm/unistd_32.h" "$output/linux-headers/asm-s390/"
cp "$hdrdir/include/asm/unistd_64.h" "$output/linux-headers/asm-s390/"
fi
if [ $arch = arm ]; then
cp "$hdrdir/include/asm/unistd-eabi.h" "$output/linux-headers/asm-arm/"
cp "$hdrdir/include/asm/unistd-oabi.h" "$output/linux-headers/asm-arm/"
cp "$hdrdir/include/asm/unistd-common.h" "$output/linux-headers/asm-arm/"
fi
if [ $arch = arm64 ]; then
cp "$hdrdir/include/asm/sve_context.h" "$output/linux-headers/asm-arm64/"
fi
if [ $arch = x86 ]; then
cp "$hdrdir/include/asm/unistd_32.h" "$output/linux-headers/asm-x86/"
cp "$hdrdir/include/asm/unistd_x32.h" "$output/linux-headers/asm-x86/"
cp "$hdrdir/include/asm/unistd_64.h" "$output/linux-headers/asm-x86/"
cp_portable "$hdrdir/include/asm/kvm_para.h" "$output/include/standard-headers/asm-$arch"
# Remove everything except the macros from bootparam.h avoiding the
# unnecessary import of several video/ist/etc headers
sed -e '/__ASSEMBLY__/,/__ASSEMBLY__/d' \
"$hdrdir/include/asm/bootparam.h" > "$hdrdir/bootparam.h"
cp_portable "$hdrdir/bootparam.h" \
"$output/include/standard-headers/asm-$arch"
cp_portable "$hdrdir/include/asm/setup_data.h" \
"$output/include/standard-headers/asm-x86"
fi
if [ $arch = riscv ]; then
cp "$hdrdir/include/asm/ptrace.h" "$output/linux-headers/asm-riscv/"
fi
done
arch=
rm -rf "$output/linux-headers/linux"
mkdir -p "$output/linux-headers/linux"
for header in const.h stddef.h kvm.h vfio.h vfio_ccw.h vfio_zdev.h vhost.h \
psci.h psp-sev.h userfaultfd.h memfd.h mman.h nvme_ioctl.h \
vduse.h iommufd.h bits.h; do
cp "$hdrdir/include/linux/$header" "$output/linux-headers/linux"
done
rm -rf "$output/linux-headers/asm-generic"
mkdir -p "$output/linux-headers/asm-generic"
for header in unistd.h bitsperlong.h mman-common.h mman.h hugetlb_encode.h; do
cp "$hdrdir/include/asm-generic/$header" "$output/linux-headers/asm-generic"
done
if [ -L "$linux/source" ]; then
cp "$linux/source/COPYING" "$output/linux-headers"
else
cp "$linux/COPYING" "$output/linux-headers"
fi
# Recent kernel sources split the copyright/license info into multiple
# files, which we need to copy. This set of licenses is the set that
# are referred to by SPDX lines in the headers we currently copy.
# We don't copy the Documentation/process/license-rules.rst which
# is also referred to by COPYING, since it's explanatory rather than license.
if [ -d "$linux/LICENSES" ]; then
mkdir -p "$output/linux-headers/LICENSES/preferred" \
"$output/linux-headers/LICENSES/exceptions"
for l in preferred/GPL-2.0 preferred/BSD-2-Clause preferred/BSD-3-Clause \
exceptions/Linux-syscall-note; do
cp "$linux/LICENSES/$l" "$output/linux-headers/LICENSES/$l"
done
fi
cat <<EOF >$output/linux-headers/linux/virtio_config.h
#include "standard-headers/linux/virtio_config.h"
EOF
cat <<EOF >$output/linux-headers/linux/virtio_ring.h
#include "standard-headers/linux/virtio_ring.h"
EOF
cat <<EOF >$output/linux-headers/linux/vhost_types.h
#include "standard-headers/linux/vhost_types.h"
EOF
rm -rf "$output/include/standard-headers/linux"
mkdir -p "$output/include/standard-headers/linux"
for i in "$hdrdir"/include/linux/*virtio*.h \
"$hdrdir/include/linux/qemu_fw_cfg.h" \
"$hdrdir/include/linux/fuse.h" \
"$hdrdir/include/linux/input.h" \
"$hdrdir/include/linux/input-event-codes.h" \
"$hdrdir/include/linux/udmabuf.h" \
"$hdrdir/include/linux/pci_regs.h" \
"$hdrdir/include/linux/ethtool.h" \
"$hdrdir/include/linux/const.h" \
"$hdrdir/include/linux/kernel.h" \
"$hdrdir/include/linux/vhost_types.h" \
"$hdrdir/include/linux/sysinfo.h" \
"$hdrdir/include/misc/pvpanic.h"; do
cp_portable "$i" "$output/include/standard-headers/linux"
done
mkdir -p "$output/include/standard-headers/drm"
cp_portable "$hdrdir/include/drm/drm_fourcc.h" \
"$output/include/standard-headers/drm"
cat <<EOF >$output/include/standard-headers/linux/types.h
/* For QEMU all types are already defined via osdep.h, so this
* header does not need to do anything.
*/
EOF
cat <<EOF >$output/include/standard-headers/linux/if_ether.h
#define ETH_ALEN 6
EOF
rm -rf "$tmpdir"
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