linux-kernel - Re: [PATCH 2/5] RISC-V: KVM: Allow Zicbop extension for Guest/VM

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Message-ID: <20250624-fd191a60c31c732c0d401f46@orel>
Date: Tue, 24 Jun 2025 15:46:08 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: zhouquan@...as.ac.cn
Cc: anup@...infault.org, atishp@...shpatra.org, paul.walmsley@...ive.com, 
	palmer@...belt.com, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org
Subject: Re: [PATCH 2/5] RISC-V: KVM: Allow Zicbop extension for Guest/VM

On Tue, Jun 17, 2025 at 09:10:30PM +0800, zhouquan@...as.ac.cn wrote:
> From: Quan Zhou <zhouquan@...as.ac.cn>
> 
> Extend the KVM ISA extension ONE_REG interface to allow KVM user space
> to detect and enable Zicbop extension for Guest/VM.
> 
> Signed-off-by: Quan Zhou <zhouquan@...as.ac.cn>
> ---
>  arch/riscv/include/uapi/asm/kvm.h | 1 +
>  arch/riscv/kvm/vcpu_onereg.c      | 2 ++
>  2 files changed, 3 insertions(+)
> 
> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index 0863ca178066..56959d277e86 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -185,6 +185,7 @@ enum KVM_RISCV_ISA_EXT_ID {
>  	KVM_RISCV_ISA_EXT_ZICCRSE,
>  	KVM_RISCV_ISA_EXT_ZAAMO,
>  	KVM_RISCV_ISA_EXT_ZALRSC,
> +	KVM_RISCV_ISA_EXT_ZICBOP,
>  	KVM_RISCV_ISA_EXT_MAX,
>  };
>  
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index b08a22eaa7a7..d444ec9e9e8e 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -68,6 +68,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
>  	KVM_ISA_EXT_ARR(ZFH),
>  	KVM_ISA_EXT_ARR(ZFHMIN),
>  	KVM_ISA_EXT_ARR(ZICBOM),
> +	KVM_ISA_EXT_ARR(ZICBOP),
>  	KVM_ISA_EXT_ARR(ZICBOZ),
>  	KVM_ISA_EXT_ARR(ZICCRSE),
>  	KVM_ISA_EXT_ARR(ZICNTR),
> @@ -171,6 +172,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
>  	case KVM_RISCV_ISA_EXT_ZFA:
>  	case KVM_RISCV_ISA_EXT_ZFH:
>  	case KVM_RISCV_ISA_EXT_ZFHMIN:
> +	case KVM_RISCV_ISA_EXT_ZICBOP:
>  	case KVM_RISCV_ISA_EXT_ZICCRSE:
>  	case KVM_RISCV_ISA_EXT_ZICNTR:
>  	case KVM_RISCV_ISA_EXT_ZICOND:
> -- 
> 2.34.1
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>