Illegal instruction

[sunmin89]

hi！

I want to run a guest os under qemu-kvm of qemu-system-riscv64, but came across an issue.

• It complains: "Illegal instruction"

[    0.401411] Freeing unused kernel image (initmem) memory: 2236K
[    0.402047] Run /init as init process
           _  _
          | ||_|
          | | _ ____  _   _  _  _
          | || |  _ \| | | |\ \/ /
          | || | | | | |_| |/    \
          |_||_|_| |_|\____|\_/\_/

               Busybox Rootfs

Please press Enter to activate this console.
/ # insmod apps/kvm.ko
[   21.622901] kvm [47]: hypervisor extension available
[   21.623098] kvm [47]: using Sv57x4 G-stage page table format
[   21.623289] kvm [47]: VMID 14 bits available
/ # ./apps/lkvm-static run -m 128 -c2 --console serial -p "console=ttyS0 earlyco
n" -k ./apps/Image --debug
[   39.348346] lkvm-static[48]: unhandled signal 4 code 0x1 at 0x0000000000016526 in lkvm-static[10000+c3000]
[   39.348753] CPU: 0 PID: 48 Comm: lkvm-static Not tainted 6.7.0-rc7 #1
[   39.348977] Hardware name: riscv-virtio,qemu (DT)
[   39.349144] epc : 0000000000016526 ra : 0000000000016512 sp : 00007ffff8d210b0
[   39.349427]  gp : 0000000000194f30 tp : 000000000019e760 t0 : 0000000000001000
[   39.349641]  t1 : 0000000000000038 t2 : 0000000000000001 s0 : 00000000001a12c0
[   39.349912]  s1 : 0000000000000000 a0 : 0000000000000000 a1 : 0000000000000000
[   39.350079]  a2 : 00000000000d74d8 a3 : 0000000000196208 a4 : 00000000001a12c0
[   39.350383]  a5 : 00000000000d74d8 a6 : 6e692064656c6261 a7 : 00000000001929a8
[   39.350615]  s2 : 0000000000196000 s3 : 0000000000096e60 s4 : 0000000000091ff8
[   39.350916]  s5 : 00000000000930c0 s6 : 00007ffff8d22b78 s7 : 00000000001a0950
[   39.351202]  s8 : 0000000000000009 s9 : 00007ffff8d22a20 s10: 00007ffff8d23a20
[   39.351534]  s11: 000000000019f4e0 t3 : ffffffffffffffff t4 : 00000000001a0f58
[   39.351857]  t5 : 0000000000000016 t6 : 0000000000000001
[   39.352093] status: 0000000200004020 badaddr: 000000005ac7548b cause: 0000000000000002
[   39.352581] Code: 0693 2089 ed31 77b7 000d 8793 4d87 5684 6790 8722 (548b) 5ac7
Illegal instruction

• this is my gnu tool info

$ /home/sunmin/bins/gnu-toolchain-bins-rvv-1.0/bin/riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/home/sunmin/bins/gnu-toolchain-bins-rvv-1.0/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/home/sunmin/bins/gnu-toolchain-bins-rvv-1.0/bin/../libexec/gcc/riscv64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /home/sunmin/aosp-out/riscv-gnu-toolchain/build-rvv-1.0-cintrinsic/../gcc/configure --target=riscv64-unknown-linux-gnu --prefix=/home/sunmin/aosp-out/gnu-toolchain-bins-rvv-1.0 --with-sysroot=/home/sunmin/aosp-out/gnu-toolchain-bins-rvv-1.0/sysroot --with-pkgversion=g80ae426a195 --with-system-zlib --enable-shared --enable-tls --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp --disable-libquadmath --disable-libsanitizer --disable-nls --disable-bootstrap --src=../../gcc --disable-multilib --with-abi=lp64d --with-arch=rv64gczve32x --with-tune=rocket --with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2    -mcmodel=medlow' 'CXXFLAGS_FOR_TARGET=-O2    -mcmodel=medlow'
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230702 (experimental) (g80ae426a195)

• qemu info

$ ./qemu/build/qemu-system-riscv64 --version
QEMU emulator version 9.0.0 (v9.0.0)
Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers

• Could anyone give me some guideline? thanks.