On Thu, 2023-11-16 at 09:42 +0100, Alexander Potapenko wrote: > On Wed, Nov 15, 2023 at 9:34 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> > wrote: > > > > Hi, > > > > This series provides the minimal support for Kernel Memory > > Sanitizer on > > s390. Kernel Memory Sanitizer is clang-only instrumentation for > > finding > > accesses to uninitialized memory. The clang support for s390 has > > already > > been merged [1]. > > > > With this series, I can successfully boot s390 defconfig and > > debug_defconfig with kmsan.panic=1. The tool found one real > > s390-specific bug (fixed in master). > > > > Best regards, > > Ilya > > Hi Ilya, > > This is really impressive! > Can you please share some instructions on how to run KMSAN in QEMU? > I've never touched s390, but I'm assuming it should be possible? I developed this natively (without cross-compilation or emulation, just KVM), but I just gave the following a try on x86_64 and had some success: $ make LLVM=1 ARCH=s390 O=../linux-build-s390x-cross CC=clang-18 LD=s390x-linux-gnu-ld OBJCOPY=s390x-linux-gnu-objcopy debug_defconfig $ make LLVM=1 ARCH=s390 O=../linux-build-s390x-cross CC=clang-18 LD=s390x-linux-gnu-ld OBJCOPY=s390x-linux-gnu-objcopy menuconfig $ make LLVM=1 ARCH=s390 O=../linux-build-s390x-cross CC=clang-18 LD=s390x-linux-gnu-ld OBJCOPY=s390x-linux-gnu-objcopy -j24 $ qemu-system-s390x -M accel=tcg -smp 2 -m 4G -kernel ../linux-build- s390x-cross/arch/s390/boot/bzImage -nographic -append 'root=/dev/vda1 rw console=ttyS1 nokaslr earlyprintk cio_ignore=all kmsan.panic=1' - object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng- ccw,rng=rng0 It's also possible to get a free s390 machine at [1]. [1] https://linuxone.cloud.marist.edu/oss
