add s390 buildroot and qemu commands #28
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The SystemZ maintainer in LLVM, Ulrich Weigand, sugguested that buildroot should work if manually switched to use glibc. Add a buildroot config, and qemu command to boot. Currently require's David Hildenbrand <david@redhat.com>'s QEMU patches at https://lists.nongnu.org/archive/html/qemu-s390x/2021-01/msg00035.html to boot.
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nickdesaulniers
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nathanchance
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Jan 8, 2021
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This looks good to me.
For others wanting to test this, grab b4 and run the following commands (assuming that ninja, s390x-linux-gnu tools, and clang are in your PATH).
Building QEMU:
$ git clone --recursive https://git.qemu.org/git/qemu.git
$ cd qemu
$ b4 am -o - https://lore.kernel.org/qemu-devel/20210108132049.8501-1-david@redhat.com/ | git apply -3v
$ mkdir build
$ cd build
$ ../configure --target-list=s390x-softmmu
$ ninja
Building Linux:
$ cd ../..
$ git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
$ cd linux
$ make -skj"$(nproc)" ARCH=s390 CC=clang CROSS_COMPILE=s390x-linux-gnu- O=out/s390 distclean defconfig bzImage
Testing it all with this pull:
$ cd ..
$ git clone -b buildroot_2020_11 https://github.com/ClangBuiltLinux/boot-utils
$ PATH=${PWD}/qemu/build:${PATH} boot-utils/boot-qemu.sh -a s390 -k linux/out/s390 -t 45s
|
QEMU patches were reviewed, so they should land in qemu/master in a 1-3 weeks. |
| s390) | ||
| KIMAGE=bzImage | ||
| QEMU_ARCH_ARGS=(-M s390-ccw-virtio) | ||
| QEMU=(qemu-system-s390x) |
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Using "-smp", as done on x86-64 AFAIKs might reduce boot times further. SMP under QEMU/TCG with MTTCG (one thread per vCPU, usually the default) has been working reliably for some years now.
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The SystemZ maintainer in LLVM, Ulrich Weigand, sugguested that
buildroot should work if manually switched to use glibc.
Add a buildroot config, and qemu command to boot.
Currently require's David Hildenbrand david@redhat.com's QEMU patches
at
https://lists.nongnu.org/archive/html/qemu-s390x/2021-01/msg00035.html
to boot.