Re: [PATCH] RISC-V: KVM: Delegate illegal instruction fault

[Radim Krčmář]

2025-06-20T17:17:20+08:00, Xu Lu <luxu.kernel@xxxxxxxxxxxxx>:
> Delegate illegal instruction fault to VS mode in default to avoid such
> exceptions being trapped to HS and redirected back to VS.
>
> Signed-off-by: Xu Lu <luxu.kernel@xxxxxxxxxxxxx>
> ---
> diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
> @@ -48,6 +48,7 @@
> +					 BIT(EXC_INST_ILLEGAL)    | \

You should also remove the dead code in kvm_riscv_vcpu_exit.

And why not delegate the others as well?
(EXC_LOAD_MISALIGNED, EXC_STORE_MISALIGNED, EXC_LOAD_ACCESS,
 EXC_STORE_ACCESS, and EXC_INST_ACCESS.)

Thanks.