Issue running KVM in Spike.

[tobywenman]

Hey, when I follow the instructions described here: https://github.com/kvm-riscv/howto/wiki/KVM-RISCV64-on-Spike I run into the following problem:

When I try and boot into the KVM it hangs on this step:

[   82.580745] cpuidle: using governor menu

and it seems to go into some kind of wait loop:

core   0: 0xffffffff800a9e2a (0x0207c7b3) div     a5, a5, zero
core   0: 0xffffffff800a9e2e (0x0100000f) pause
core   0: 0xffffffff800a9e32 (0x0000471c) c.lw    a5, 8(a4)
core   0: 0xffffffff800a9e34 (0x00008b85) c.andi  a5, 1
core   0: 0xffffffff800a9e36 (0x0000fbf5) c.bnez  a5, pc - 12
core   0: 0xffffffff800a9e2a (0x0207c7b3) div     a5, a5, zero
core   0: 0xffffffff800a9e2e (0x0100000f) pause
core   0: 0xffffffff800a9e32 (0x0000471c) c.lw    a5, 8(a4)
core   0: 0xffffffff800a9e34 (0x00008b85) c.andi  a5, 1
core   0: 0xffffffff800a9e36 (0x0000fbf5) c.bnez  a5, pc - 12
core   0: 0xffffffff800a9e2a (0x0207c7b3) div     a5, a5, zero
core   0: 0xffffffff800a9e2e (0x0100000f) pause

I think I'm using newer versions of the tools than was used in the tutorial (Linux version 6.9.0-rc3 (riscv64-unknown-linux-gnu-gcc () 13.2.0, GNU ld (GNU Binutils) 2.41)) Could that be the issue?
Thanks.

[tobywenman]

I've found the issue, Spike now needs to have the zihpm and zicntr extensions explicitly enabled. Changing the command to launch spike fixes it:

./riscv-isa-sim/spike -m512 --isa rv64gch_zicntr_zihpm --kernel ./build-riscv64/arch/riscv/boot/Image --initrd ./rootfs_kvm_riscv64.img opensbi/build/platform/generic/firmware/fw_jump.elf

[avpatel]

Thanks @tobywenman , I have updated the wiki page.