linux-kernel - Re: [RFC PATCH v4 3/5] RISC-V: KVM: Add Svadu Extension Support for Guest/VM

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Message-ID: <20240527-0a37c07cf34bbb0d4fb8067c@orel>
Date: Mon, 27 May 2024 18:29:24 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Yong-Xuan Wang <yongxuan.wang@...ive.com>
Cc: linux-riscv@...ts.infradead.org, kvm-riscv@...ts.infradead.org, 
	kvm@...r.kernel.org, greentime.hu@...ive.com, vincent.chen@...ive.com, 
	cleger@...osinc.com, alex@...ti.fr, Anup Patel <anup@...infault.org>, 
	Atish Patra <atishp@...shpatra.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 3/5] RISC-V: KVM: Add Svadu Extension Support for
 Guest/VM

On Fri, May 24, 2024 at 06:33:03PM GMT, Yong-Xuan Wang wrote:
> We extend the KVM ISA extension ONE_REG interface to allow VMM tools to
> detect and enable Svadu extension for Guest/VM. The ADUE bit in henvcfg
> is cleared by default for backward-compatibility.
> 
> Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
> ---
>  arch/riscv/include/uapi/asm/kvm.h | 1 +
>  arch/riscv/kvm/vcpu_onereg.c      | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index a59a8448deea..bcf99264560d 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -167,6 +167,7 @@ enum KVM_RISCV_ISA_EXT_ID {
>  	KVM_RISCV_ISA_EXT_ZFA,
>  	KVM_RISCV_ISA_EXT_ZTSO,
>  	KVM_RISCV_ISA_EXT_ZACAS,
> +	KVM_RISCV_ISA_EXT_SVADU,
>  	KVM_RISCV_ISA_EXT_MAX,
>  };
>  
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index 994adc26db4b..4166665e215d 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -37,6 +37,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
>  	KVM_ISA_EXT_ARR(SMSTATEEN),
>  	KVM_ISA_EXT_ARR(SSAIA),
>  	KVM_ISA_EXT_ARR(SSTC),
> +	KVM_ISA_EXT_ARR(SVADU),
>  	KVM_ISA_EXT_ARR(SVINVAL),
>  	KVM_ISA_EXT_ARR(SVNAPOT),
>  	KVM_ISA_EXT_ARR(SVPBMT),
> -- 
> 2.17.1
>

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