Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 243 insertions, 0 deletions

diff --git a/scripts/update-linux-headers.sh b/scripts/update-linux-headers.sh
new file mode 100755
index 000000000..fea4d6eb6
--- /dev/null
+++ b/scripts/update-linux-headers.sh
@@ -0,0 +1,243 @@
+#!/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.
+
+tmpdir=$(mktemp -d)
+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 'pvrdma_verbs' \
+                                     -e 'drm.h' \
+                                     -e 'limits' \
+                                     -e 'linux/const' \
+                                     -e 'linux/kernel' \
+                                     -e 'linux/sysinfo' \
+                                     -e 'asm-generic/kvm_para' \
+                                     > /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/__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
+
+    make -C "$linux" INSTALL_HDR_PATH="$tmpdir" $arch_var=$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
+        cp "$tmpdir/include/asm/$header" "$output/linux-headers/asm-$arch"
+    done
+
+    if [ $arch = mips ]; then
+        cp "$tmpdir/include/asm/sgidefs.h" "$output/linux-headers/asm-mips/"
+        cp "$tmpdir/include/asm/unistd_o32.h" "$output/linux-headers/asm-mips/"
+        cp "$tmpdir/include/asm/unistd_n32.h" "$output/linux-headers/asm-mips/"
+        cp "$tmpdir/include/asm/unistd_n64.h" "$output/linux-headers/asm-mips/"
+    fi
+    if [ $arch = powerpc ]; then
+        cp "$tmpdir/include/asm/unistd_32.h" "$output/linux-headers/asm-powerpc/"
+        cp "$tmpdir/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 [ $arch = s390 ]; then
+        cp_portable "$tmpdir/include/asm/virtio-ccw.h" "$output/include/standard-headers/asm-s390/"
+        cp "$tmpdir/include/asm/unistd_32.h" "$output/linux-headers/asm-s390/"
+        cp "$tmpdir/include/asm/unistd_64.h" "$output/linux-headers/asm-s390/"
+    fi
+    if [ $arch = arm ]; then
+        cp "$tmpdir/include/asm/unistd-eabi.h" "$output/linux-headers/asm-arm/"
+        cp "$tmpdir/include/asm/unistd-oabi.h" "$output/linux-headers/asm-arm/"
+        cp "$tmpdir/include/asm/unistd-common.h" "$output/linux-headers/asm-arm/"
+    fi
+    if [ $arch = arm64 ]; then
+        cp "$tmpdir/include/asm/sve_context.h" "$output/linux-headers/asm-arm64/"
+    fi
+    if [ $arch = x86 ]; then
+        cp "$tmpdir/include/asm/unistd_32.h" "$output/linux-headers/asm-x86/"
+        cp "$tmpdir/include/asm/unistd_x32.h" "$output/linux-headers/asm-x86/"
+        cp "$tmpdir/include/asm/unistd_64.h" "$output/linux-headers/asm-x86/"
+        cp_portable "$tmpdir/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' \
+               "$tmpdir/include/asm/bootparam.h" > "$tmpdir/bootparam.h"
+        cp_portable "$tmpdir/bootparam.h" \
+                    "$output/include/standard-headers/asm-$arch"
+    fi
+done
+
+rm -rf "$output/linux-headers/linux"
+mkdir -p "$output/linux-headers/linux"
+for header in kvm.h vfio.h vfio_ccw.h vfio_zdev.h vhost.h \
+              psci.h psp-sev.h userfaultfd.h mman.h; do
+    cp "$tmpdir/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 "$tmpdir/include/asm-generic/$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 "$tmpdir"/include/linux/*virtio*.h \
+         "$tmpdir/include/linux/qemu_fw_cfg.h" \
+         "$tmpdir/include/linux/fuse.h" \
+         "$tmpdir/include/linux/input.h" \
+         "$tmpdir/include/linux/input-event-codes.h" \
+         "$tmpdir/include/linux/udmabuf.h" \
+         "$tmpdir/include/linux/pci_regs.h" \
+         "$tmpdir/include/linux/ethtool.h" \
+         "$tmpdir/include/linux/const.h" \
+         "$tmpdir/include/linux/kernel.h" \
+         "$tmpdir/include/linux/vhost_types.h" \
+         "$tmpdir/include/linux/sysinfo.h"; do
+    cp_portable "$i" "$output/include/standard-headers/linux"
+done
+mkdir -p "$output/include/standard-headers/drm"
+cp_portable "$tmpdir/include/drm/drm_fourcc.h" \
+            "$output/include/standard-headers/drm"
+
+rm -rf "$output/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma"
+mkdir -p "$output/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma"
+
+# Remove the unused functions from pvrdma_verbs.h avoiding the unnecessary
+# import of several infiniband/networking/other headers
+tmp_pvrdma_verbs="$tmpdir/pvrdma_verbs.h"
+# Parse the entire file instead of single lines to match
+# function declarations expanding over multiple lines
+# and strip the declarations starting with pvrdma prefix.
+sed  -e '1h;2,$H;$!d;g'  -e 's/[^};]*pvrdma[^(| ]*([^)]*);//g' \
+    "$linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma_verbs.h" > \
+    "$tmp_pvrdma_verbs";
+
+for i in "$linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma_dev_api.h" \
+         "$tmp_pvrdma_verbs"; do \
+    cp_portable "$i" \
+         "$output/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/"
+done
+
+rm -rf "$output/include/standard-headers/rdma/"
+mkdir -p "$output/include/standard-headers/rdma/"
+for i in "$tmpdir/include/rdma/vmw_pvrdma-abi.h"; do
+    cp_portable "$i" \
+         "$output/include/standard-headers/rdma/"
+done
+
+cat <<EOF >$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"