1#!/bin/sh -e
2#
3# Update Linux kernel headers QEMU requires from a specified kernel tree.
4#
5# Copyright (C) 2011 Siemens AG
6#
7# Authors:
8#  Jan Kiszka        <jan.kiszka@siemens.com>
9#
10# This work is licensed under the terms of the GNU GPL version 2.
11# See the COPYING file in the top-level directory.
12#
13# The script will copy the headers into two target folders:
14#
15# - linux-headers/ for files that are required for compiling for a
16#   Linux host.  Generally we have these so we can use kernel structs
17#   and defines that are more recent than the headers that might be
18#   installed on the host system.  Usually this script can do simple
19#   file copies for these headers.
20#
21# - include/standard-headers/ for files that are used for guest
22#   device emulation and are required on all hosts.  For instance, we
23#   get our definitions of the virtio structures from the Linux
24#   kernel headers, but we need those definitions regardless of which
25#   host OS we are building for.  This script has to be careful to
26#   sanitize the headers to remove any use of Linux-specifics such as
27#   types like "__u64".  This work is done in the cp_portable function.
28
29tmpdir=$(mktemp -d)
30linux="$1"
31output="$2"
32
33if [ -z "$linux" ] || ! [ -d "$linux" ]; then
34    cat << EOF
35usage: update-kernel-headers.sh LINUX_PATH [OUTPUT_PATH]
36
37LINUX_PATH      Linux kernel directory to obtain the headers from
38OUTPUT_PATH     output directory, usually the qemu source tree (default: $PWD)
39EOF
40    exit 1
41fi
42
43if [ -z "$output" ]; then
44    output="$PWD"
45fi
46
47cp_portable() {
48    f=$1
49    to=$2
50    if
51        grep '#include' "$f" | grep -v -e 'linux/virtio' \
52                                     -e 'linux/types' \
53                                     -e 'linux/ioctl' \
54                                     -e 'stdint' \
55                                     -e 'linux/if_ether' \
56                                     -e 'input-event-codes' \
57                                     -e 'sys/' \
58                                     -e 'pvrdma_verbs' \
59                                     -e 'drm.h' \
60                                     -e 'limits' \
61                                     -e 'linux/const' \
62                                     -e 'linux/kernel' \
63                                     -e 'linux/sysinfo' \
64                                     -e 'asm-generic/kvm_para' \
65                                     > /dev/null
66    then
67        echo "Unexpected #include in input file $f".
68        exit 2
69    fi
70
71    header=$(basename "$f");
72    sed -e 's/__aligned_u64/__u64 __attribute__((aligned(8)))/g' \
73        -e 's/__u\([0-9][0-9]*\)/uint\1_t/g' \
74        -e 's/u\([0-9][0-9]*\)/uint\1_t/g' \
75        -e 's/__s\([0-9][0-9]*\)/int\1_t/g' \
76        -e 's/__le\([0-9][0-9]*\)/uint\1_t/g' \
77        -e 's/__be\([0-9][0-9]*\)/uint\1_t/g' \
78        -e 's/"\(input-event-codes\.h\)"/"standard-headers\/linux\/\1"/' \
79        -e 's/<linux\/\([^>]*\)>/"standard-headers\/linux\/\1"/' \
80        -e 's/__bitwise//' \
81        -e 's/__attribute__((packed))/QEMU_PACKED/' \
82        -e 's/__inline__/inline/' \
83        -e 's/__BITS_PER_LONG/HOST_LONG_BITS/' \
84        -e '/\"drm.h\"/d' \
85        -e '/sys\/ioctl.h/d' \
86        -e '/linux\/ioctl.h/d' \
87        -e 's/SW_MAX/SW_MAX_/' \
88        -e 's/atomic_t/int/' \
89        -e 's/__kernel_long_t/long/' \
90        -e 's/__kernel_ulong_t/unsigned long/' \
91        -e 's/struct ethhdr/struct eth_header/' \
92        -e '/\#define _LINUX_ETHTOOL_H/a \\n\#include "net/eth.h"' \
93        "$f" > "$to/$header";
94}
95
96# This will pick up non-directories too (eg "Kconfig") but we will
97# ignore them in the next loop.
98ARCHLIST=$(cd "$linux/arch" && echo *)
99
100for arch in $ARCHLIST; do
101    # Discard anything which isn't a KVM-supporting architecture
102    if ! [ -e "$linux/arch/$arch/include/asm/kvm.h" ] &&
103        ! [ -e "$linux/arch/$arch/include/uapi/asm/kvm.h" ] ; then
104        continue
105    fi
106
107    if [ "$arch" = x86 ]; then
108        arch_var=SRCARCH
109    else
110        arch_var=ARCH
111    fi
112
113    make -C "$linux" INSTALL_HDR_PATH="$tmpdir" $arch_var=$arch headers_install
114
115    rm -rf "$output/linux-headers/asm-$arch"
116    mkdir -p "$output/linux-headers/asm-$arch"
117    for header in kvm.h unistd.h bitsperlong.h mman.h; do
118        cp "$tmpdir/include/asm/$header" "$output/linux-headers/asm-$arch"
119    done
120
121    if [ $arch = mips ]; then
122        cp "$tmpdir/include/asm/sgidefs.h" "$output/linux-headers/asm-mips/"
123        cp "$tmpdir/include/asm/unistd_o32.h" "$output/linux-headers/asm-mips/"
124        cp "$tmpdir/include/asm/unistd_n32.h" "$output/linux-headers/asm-mips/"
125        cp "$tmpdir/include/asm/unistd_n64.h" "$output/linux-headers/asm-mips/"
126    fi
127    if [ $arch = powerpc ]; then
128        cp "$tmpdir/include/asm/unistd_32.h" "$output/linux-headers/asm-powerpc/"
129        cp "$tmpdir/include/asm/unistd_64.h" "$output/linux-headers/asm-powerpc/"
130    fi
131
132    rm -rf "$output/include/standard-headers/asm-$arch"
133    mkdir -p "$output/include/standard-headers/asm-$arch"
134    if [ $arch = s390 ]; then
135        cp_portable "$tmpdir/include/asm/virtio-ccw.h" "$output/include/standard-headers/asm-s390/"
136        cp "$tmpdir/include/asm/unistd_32.h" "$output/linux-headers/asm-s390/"
137        cp "$tmpdir/include/asm/unistd_64.h" "$output/linux-headers/asm-s390/"
138    fi
139    if [ $arch = arm ]; then
140        cp "$tmpdir/include/asm/unistd-eabi.h" "$output/linux-headers/asm-arm/"
141        cp "$tmpdir/include/asm/unistd-oabi.h" "$output/linux-headers/asm-arm/"
142        cp "$tmpdir/include/asm/unistd-common.h" "$output/linux-headers/asm-arm/"
143    fi
144    if [ $arch = arm64 ]; then
145        cp "$tmpdir/include/asm/sve_context.h" "$output/linux-headers/asm-arm64/"
146    fi
147    if [ $arch = x86 ]; then
148        cp "$tmpdir/include/asm/unistd_32.h" "$output/linux-headers/asm-x86/"
149        cp "$tmpdir/include/asm/unistd_x32.h" "$output/linux-headers/asm-x86/"
150        cp "$tmpdir/include/asm/unistd_64.h" "$output/linux-headers/asm-x86/"
151        cp_portable "$tmpdir/include/asm/kvm_para.h" "$output/include/standard-headers/asm-$arch"
152        # Remove everything except the macros from bootparam.h avoiding the
153        # unnecessary import of several video/ist/etc headers
154        sed -e '/__ASSEMBLY__/,/__ASSEMBLY__/d' \
155               "$tmpdir/include/asm/bootparam.h" > "$tmpdir/bootparam.h"
156        cp_portable "$tmpdir/bootparam.h" \
157                    "$output/include/standard-headers/asm-$arch"
158    fi
159done
160
161rm -rf "$output/linux-headers/linux"
162mkdir -p "$output/linux-headers/linux"
163for header in const.h stddef.h kvm.h vfio.h vfio_ccw.h vfio_zdev.h vhost.h \
164              psci.h psp-sev.h userfaultfd.h memfd.h mman.h nvme_ioctl.h \
165              vduse.h iommufd.h; do
166    cp "$tmpdir/include/linux/$header" "$output/linux-headers/linux"
167done
168
169rm -rf "$output/linux-headers/asm-generic"
170mkdir -p "$output/linux-headers/asm-generic"
171for header in unistd.h bitsperlong.h mman-common.h mman.h hugetlb_encode.h; do
172    cp "$tmpdir/include/asm-generic/$header" "$output/linux-headers/asm-generic"
173done
174
175if [ -L "$linux/source" ]; then
176    cp "$linux/source/COPYING" "$output/linux-headers"
177else
178    cp "$linux/COPYING" "$output/linux-headers"
179fi
180
181# Recent kernel sources split the copyright/license info into multiple
182# files, which we need to copy. This set of licenses is the set that
183# are referred to by SPDX lines in the headers we currently copy.
184# We don't copy the Documentation/process/license-rules.rst which
185# is also referred to by COPYING, since it's explanatory rather than license.
186if [ -d "$linux/LICENSES" ]; then
187    mkdir -p "$output/linux-headers/LICENSES/preferred" \
188             "$output/linux-headers/LICENSES/exceptions"
189    for l in preferred/GPL-2.0 preferred/BSD-2-Clause preferred/BSD-3-Clause \
190             exceptions/Linux-syscall-note; do
191        cp "$linux/LICENSES/$l" "$output/linux-headers/LICENSES/$l"
192    done
193fi
194
195cat <<EOF >$output/linux-headers/linux/virtio_config.h
196#include "standard-headers/linux/virtio_config.h"
197EOF
198cat <<EOF >$output/linux-headers/linux/virtio_ring.h
199#include "standard-headers/linux/virtio_ring.h"
200EOF
201cat <<EOF >$output/linux-headers/linux/vhost_types.h
202#include "standard-headers/linux/vhost_types.h"
203EOF
204
205rm -rf "$output/include/standard-headers/linux"
206mkdir -p "$output/include/standard-headers/linux"
207for i in "$tmpdir"/include/linux/*virtio*.h \
208         "$tmpdir/include/linux/qemu_fw_cfg.h" \
209         "$tmpdir/include/linux/fuse.h" \
210         "$tmpdir/include/linux/input.h" \
211         "$tmpdir/include/linux/input-event-codes.h" \
212         "$tmpdir/include/linux/udmabuf.h" \
213         "$tmpdir/include/linux/pci_regs.h" \
214         "$tmpdir/include/linux/ethtool.h" \
215         "$tmpdir/include/linux/const.h" \
216         "$tmpdir/include/linux/kernel.h" \
217         "$tmpdir/include/linux/vhost_types.h" \
218         "$tmpdir/include/linux/sysinfo.h" \
219         "$tmpdir/include/misc/pvpanic.h"; do
220    cp_portable "$i" "$output/include/standard-headers/linux"
221done
222mkdir -p "$output/include/standard-headers/drm"
223cp_portable "$tmpdir/include/drm/drm_fourcc.h" \
224            "$output/include/standard-headers/drm"
225
226rm -rf "$output/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma"
227mkdir -p "$output/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma"
228
229# Remove the unused functions from pvrdma_verbs.h avoiding the unnecessary
230# import of several infiniband/networking/other headers
231tmp_pvrdma_verbs="$tmpdir/pvrdma_verbs.h"
232# Parse the entire file instead of single lines to match
233# function declarations expanding over multiple lines
234# and strip the declarations starting with pvrdma prefix.
235sed  -e '1h;2,$H;$!d;g'  -e 's/[^};]*pvrdma[^(| ]*([^)]*);//g' \
236    "$linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma_verbs.h" > \
237    "$tmp_pvrdma_verbs";
238
239for i in "$linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma_dev_api.h" \
240         "$tmp_pvrdma_verbs"; do \
241    cp_portable "$i" \
242         "$output/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/"
243done
244
245rm -rf "$output/include/standard-headers/rdma/"
246mkdir -p "$output/include/standard-headers/rdma/"
247for i in "$tmpdir/include/rdma/vmw_pvrdma-abi.h"; do
248    cp_portable "$i" \
249         "$output/include/standard-headers/rdma/"
250done
251
252cat <<EOF >$output/include/standard-headers/linux/types.h
253/* For QEMU all types are already defined via osdep.h, so this
254 * header does not need to do anything.
255 */
256EOF
257cat <<EOF >$output/include/standard-headers/linux/if_ether.h
258#define ETH_ALEN    6
259EOF
260
261rm -rf "$tmpdir"
262