Re: [PATCH v2 4/7] RISC-V: KVM: Allow Zicfiss/Zicfilp extensions for Guest/VM

[Inochi Amaoto <inochiama@gmail.com>]

On Mon, Jun 01, 2026 at 04:43:32PM +0800, Inochi Amaoto wrote:
> Extend the KVM ISA extension array to allow KVM userspace to
> detect and enable Zicfiss/Zicfilp extensions for Guest/VM.
> 
> Assisted-by: YuanSheng:claude-4.7-opus
> Co-developed-by: Quan Zhou <zhouquan@iscas.ac.cn>
> Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
> Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
> ---
>  arch/riscv/include/uapi/asm/kvm.h | 2 ++
>  arch/riscv/kvm/isa.c              | 2 ++
>  2 files changed, 4 insertions(+)
> 

I have forgot to add CSR_SSP to the context, will add in the next
version. But I have a small question for it: could I reuse the 
generic subtype or use a new CSR subtype?

Regards,
Inochi

> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index 501e4fc60dd2..9f9c5ababd1e 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -199,6 +199,8 @@ enum KVM_RISCV_ISA_EXT_ID {
>  	KVM_RISCV_ISA_EXT_ZCLSD,
>  	KVM_RISCV_ISA_EXT_ZILSD,
>  	KVM_RISCV_ISA_EXT_ZALASR,
> +	KVM_RISCV_ISA_EXT_ZICFILP,
> +	KVM_RISCV_ISA_EXT_ZICFISS,
>  	KVM_RISCV_ISA_EXT_MAX,
>  };
>  
> diff --git a/arch/riscv/kvm/isa.c b/arch/riscv/kvm/isa.c
> index 1132d909cc25..9852a91fdecc 100644
> --- a/arch/riscv/kvm/isa.c
> +++ b/arch/riscv/kvm/isa.c
> @@ -65,6 +65,8 @@ static const unsigned long kvm_isa_ext_arr[] = {
>  	KVM_ISA_EXT_ARR(ZICBOP),
>  	KVM_ISA_EXT_ARR(ZICBOZ),
>  	KVM_ISA_EXT_ARR(ZICCRSE),
> +	KVM_ISA_EXT_ARR(ZICFILP),
> +	KVM_ISA_EXT_ARR(ZICFISS),
>  	KVM_ISA_EXT_ARR(ZICNTR),
>  	KVM_ISA_EXT_ARR(ZICOND),
>  	KVM_ISA_EXT_ARR(ZICSR),
> -- 
> 2.54.0
> 
> 
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