3rd-party/linux-kernel-module-cheat
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GEM5 checkpoint

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Add gem5 as buildroot package to cross compile m5.

Add gem5 as a submodule.

Split gem5 from arch on CLI with "-a arm -g" instead of "-a arm-gem5".
This commit is contained in:
Ciro Santilli
2018-02-21 00:44:17 +00:00
parent 0c2bd829d4
commit 9e5173f324
11 changed files with 133 additions and 54 deletions
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2
.gitignore vendored
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@@ -13,6 +13,4 @@ modules.order
trace*
# GEM5
/gem5
/gem5-system
/m5out

3
.gitmodules vendored
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@@ -8,3 +8,6 @@
[submodule "linux"]
path = linux
url = https://github.com/cirosantilli/linux
[submodule "gem5/gem5"]
path = gem5/gem5
url = https://gem5.googlesource.com/public/gem5

56
README.adoc
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@@ -1208,8 +1208,8 @@ Instead, we have only chip makers, who keep everything that really works closed,
==== GEM5 ARM
....
./configure && ./build -a arm-gem5
./rungem5 -a arm-gem5
./configure && ./build -a arm -g
./rungem5 -a arm
....
On another shell:
@@ -1223,7 +1223,7 @@ On another shell:
E.g., to add `printk.time=y`, run:
....
./rungem5 -a arm-gem5 -- --command-line='earlyprintk=pl011,0x1c090000 console=ttyAMA0 lpj=19988480 norandmaps rw loglevel=8 mem=512MB root=/dev/sda printk.time=y'
./rungem5 -a arm -- --command-line='earlyprintk=pl011,0x1c090000 console=ttyAMA0 lpj=19988480 norandmaps rw loglevel=8 mem=512MB root=/dev/sda printk.time=y'
....
When you use `--command-line=`, it overrides default command lines, which are required to boot properly.
@@ -1233,7 +1233,7 @@ So if you pass just `--command-line='printk.time=y'`, it removes the required op
An easy way to find the other options is to to an initial boot:
....
./rungem5 -a arm-gem5
./rungem5 -a arm
....
and then look at the line of the linux kernel that starts with
@@ -1295,6 +1295,54 @@ Escape character is '^]'.
I have also tried to copy the exact same kernel command line options used by QEMU, but nothing changed.
===== GEM5 checkpoint
Analogous to QEMU's <<snapshot>>.
Documentation: http://gem5.org/Checkpoints
....
./rungem5 -a arm
....
In guest, wait for the boot to end and run:
....
/m5 checkpoint
....
To restore the checkpoint, kill the VM and run:
....
./rungem5 -a arm -- -r 1
....
Let's create a second checkpoint to see how it works, in guest:
....
date >f
/m5 checkpoint
....
Kill the VM, and try it out:
....
./rungem5 -a arm -- -r 2
....
and now in the guest:
....
cat f
....
contains the `date`. The file `f` wouldn't exist had we used the first checkpoint with `-r 1`.
Internals:
- the checkpoints are stored under `m5out/cpt.*`
- `m5` is a guest utility present inside the GEM5 tree which we cross-compiled and installed into the guest
==== GEM5 x86
TODO didn't get it working yet.

37
build
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@@ -2,16 +2,20 @@
set -e
arch=x86_64
extra_targets=''
qemu_sdl='--enable-sdl --with-sdlabi=2.0'
gem5=false
j="$(($(nproc) - 2))"
post_script_args=''
qemu_sdl='--enable-sdl --with-sdlabi=2.0'
x11=false
v=0
while getopts 'a:j:lp:qSt:v' OPT; do
while getopts 'a:gj:lp:qSt:v' OPT; do
case "$OPT" in
a)
arch="$OPTARG"
;;
g)
gem5=true
;;
j)
j="$OPTARG"
;;
@@ -43,19 +47,17 @@ case "$arch" in
x86_64)
defconfig=qemu_x86_64_defconfig
;;
x86_64-gem5)
defconfig=qemu_x86_64_defconfig
;;
arm)
# qemu_arm_vexpress_defconfig required a newer QEMU than 2.0.0 on a Ubuntu host.
# so let's stick to versatile for now.
defconfig=qemu_arm_versatile_defconfig
;;
arm-gem5)
if "$gem5"; then
# Ideally we should use a custom clean config here.
# But let's just use this one as a starting point for now.
defconfig=qemu_arm_versatile_defconfig
post_script_args="$post_script_args -n"
else
# qemu_arm_vexpress_defconfig required a newer QEMU than 2.0.0 on a Ubuntu host.
# so let's stick to versatile for now.
defconfig=qemu_arm_versatile_defconfig
fi
;;
aarch64)
defconfig=qemu_aarch64_virt_defconfig
@@ -64,6 +66,10 @@ case "$arch" in
defconfig=qemu_mips64r6_malta_defconfig
;;
esac
arch_dir="$arch"
if "$gem5"; then
arch_dir="${arch}-gem5"
fi
cd kernel_module
./make-host.sh -j "$j" clean
@@ -71,14 +77,14 @@ cd ../buildroot
for p in $(find '../buildroot_patches/' -maxdepth 1 -name '*.patch' -print); do
patch -N -r - -p 1 <"$p" || :
done
outdir="output.${arch}~"
make O="$outdir" BR2_EXTERNAL="$(pwd)/../kernel_module" "$defconfig"
outdir="output.${arch_dir}~"
make O="$outdir" BR2_EXTERNAL="$(pwd)/../kernel_module:$(pwd)/../gem5" "$defconfig"
# TODO Can't get rid of this for now.
# http://stackoverflow.com/questions/44078245/is-it-possible-to-use-config-fragments-with-buildroots-config
cat ../buildroot_config_fragment >> "${outdir}/.config"
if echo "$arch" | grep -Eq -- '-gem5$'; then
if "$gem5"; then
echo "\
BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE=\"../kernel_config_${arch}\"
BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE=\"../kernel_config_${arch_dir}\"
" >> "${outdir}/.config"
else
echo "\
@@ -105,6 +111,7 @@ time \
make \
O="$outdir" \
BR2_JLEVEL="$j" \
BR2_PACKAGE_GEM5="$("$gem5" && echo y || echo n)" \
BR2_ROOTFS_POST_SCRIPT_ARGS="$post_script_args" \
HOST_QEMU_OPTS="--enable-debug --extra-cflags='-DDEBUG_PL061=1' --enable-trace-backends=simple $qemu_sdl" \
V="$v" \
@@ -113,6 +120,6 @@ time \
all \
;
cd ..
if echo "$arch" | grep -Eq -- '-gem5$'; then
if "$gem5"; then
./build-gem5 -a "$arch"
fi

17
build-gem5
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@@ -1,6 +1,6 @@
#/usr/bin/env bash
set -eu
arch='arm-gem5'
arch=arm
while getopts 'a:' OPT; do
case "$OPT" in
a)
@@ -9,16 +9,13 @@ while getopts 'a:' OPT; do
esac
done
shift "$(($OPTIND - 1))"
if [ ! -d 'gem5' ]; then
git clone https://gem5.googlesource.com/public/gem5
fi
cd gem5
git checkout da79d6c6cde0fbe5473ce868c9be4771160a003b
system_dir='../gem5-system'
top="$(pwd)/gem5"
system_dir="${top}/gem5-system"
binaries_dir="${system_dir}/binaries"
disks_dir="${system_dir}/disks"
mkdir -p "$binaries_dir" "$disks_dir"
if [ "$arch" = 'x86_64-gem5' ]; then
cd "${top}/gem5"
if [ "$arch" = x86_64 ]; then
CC=gcc-6 CXX=g++-6 scons -j"$(nproc)" --ignore-style build/X86/gem5.opt
f="${disks_dir}/linux-bigswap2.img"
dd if=/dev/zero of="$f" bs=1024 count=65536
@@ -26,7 +23,7 @@ if [ "$arch" = 'x86_64-gem5' ]; then
# This file must always be present, despite --kernel overriding that default and selecting the kernel.
# I'm not even joking. No one has ever built x86 gem5 without the magic dist dir present.
touch "${binaries_dir}/x86_64-vmlinux-2.6.22.9"
elif [ "$arch" = 'arm-gem5' ]; then
elif [ "$arch" = arm ]; then
# Compilation fails with gcc 7 on that commit.
# There were some recent portability patches, so it will likely get there soon.
CC=gcc-6 CXX=g++-6 scons -j"$(nproc)" --ignore-style build/ARM/gem5.opt
@@ -37,4 +34,4 @@ elif [ "$arch" = 'arm-gem5' ]; then
cp ./system/arm/aarch64_bootloader/boot_emm.arm64 "$binaries_dir"
fi
# TODO vs telnet?
make -C gem5/util/term
make -C util/term

1
gem5/.gitignore vendored Normal file
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@@ -0,0 +1 @@
/gem5-system

4
gem5/Config.in Normal file
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@@ -0,0 +1,4 @@
config BR2_PACKAGE_GEM5
bool "gem5"
help
GEM5

1
gem5/external.desc Normal file
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@@ -0,0 +1 @@
name: GEM5

19
gem5/external.mk Normal file
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@@ -0,0 +1,19 @@
################################################################################
#
# GEM5
#
################################################################################
GEM5_VERSION = 1.0
GEM5_SITE = $(BR2_EXTERNAL_GEM5_PATH)
GEM5_SITE_METHOD = local
define GEM5_BUILD_CMDS
cd '$(@D)/gem5/util/m5' && $(MAKE) -f 'Makefile.$(ARCH)' CC='$(TARGET_CC)' LD='$(TARGET_LD)'
endef
define GEM5_INSTALL_TARGET_CMDS
$(INSTALL) -D -m 0755 '$(@D)/gem5/util/m5/m5' '$(TARGET_DIR)'
endef
$(eval $(generic-package))

1
gem5/gem5 Submodule

Submodule gem5/gem5 added at da79d6c6cd

38
rungem5
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@@ -1,5 +1,5 @@
#!/usr/bin/env bash
arch='arm-gem5'
arch=arm
while getopts 'a:' OPT; do
case "$OPT" in
a)
@@ -8,27 +8,27 @@ while getopts 'a:' OPT; do
esac
done
shift "$(($OPTIND - 1))"
outdir="$(pwd)/buildroot/output.${arch}~"
echo $arch
if echo "$arch" | grep -Eq '^x86_64(-|$)'; then
outdir="$(pwd)/buildroot/output.${arch}-gem5~"
gem5_dir="$(pwd)/gem5/gem5"
if [ "$arch" = x86_64 ]; then
cmd="\
M5_PATH=\"$(pwd)/gem5-system\" \
./gem5/build/X86/gem5.opt \
gem5/configs/example/fs.py \
--disk-image=\"${outdir}/images/rootfs.ext2\" \
--kernel=\"${outdir}/build/linux-custom/vmlinux\" \
--root-device='/dev/sda' \
M5_PATH='$(pwd)/gem5/gem5-system' \
'${gem5_dir}/build/X86/gem5.opt' \
'${gem5_dir}/configs/example/fs.py' \
--disk-image='${outdir}/images/rootfs.ext2' \
--kernel='${outdir}/build/linux-custom/vmlinux' \
--root-device=/dev/sda \
"
elif echo "$arch" | grep -Eq '^arm(-|$)'; then
elif [ "$arch" = arm ]; then
cmd="\
M5_PATH=\"$(pwd)/gem5-system\" \
./gem5/build/ARM/gem5.opt \
gem5/configs/example/fs.py \
--disk-image=\"${outdir}/images/rootfs.ext2\" \
--dtb-file=\"$(pwd)/gem5/system/arm/dt/armv7_gem5_v1_1cpu.dtb\" \
--kernel=\"${outdir}/build/linux-custom/vmlinux\" \
--machine-type='VExpress_GEM5_V1' \
--root-device='/dev/sda' \
M5_PATH='$(pwd)/gem5/gem5-system' \
'${gem5_dir}/build/ARM/gem5.opt' \
'${gem5_dir}/configs/example/fs.py' \
--disk-image='${outdir}/images/rootfs.ext2' \
--dtb-file='${gem5_dir}/system/arm/dt/armv7_gem5_v1_1cpu.dtb' \
--kernel='${outdir}/build/linux-custom/vmlinux' \
--machine-type=VExpress_GEM5_V1 \
--root-device=/dev/sda \
"
fi
cmd="$cmd \"\$@\""