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

[Andrew Jones]

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 at sifive.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 at ventanamicro.com>