[PATCH 02/15] RISC-V: KVM: Allow Zbc extension for Guest/VM

[Andrew Jones]

On Tue, Nov 28, 2023 at 08:23:44PM +0530, Anup Patel wrote:
> We extend the KVM ISA extension ONE_REG interface to allow KVM
> user space to detect and enable Zbc extension for Guest/VM.
> 
> Signed-off-by: Anup Patel <apatel at ventanamicro.com>
> ---
>  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 60d3b21dead7..518b368b41e5 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -139,6 +139,7 @@ enum KVM_RISCV_ISA_EXT_ID {
>  	KVM_RISCV_ISA_EXT_ZIHPM,
>  	KVM_RISCV_ISA_EXT_SMSTATEEN,
>  	KVM_RISCV_ISA_EXT_ZICOND,
> +	KVM_RISCV_ISA_EXT_ZBC,
>  	KVM_RISCV_ISA_EXT_MAX,
>  };
>  
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index f8c9fa0c03c5..f789517c9fae 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -42,6 +42,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
>  	KVM_ISA_EXT_ARR(SVPBMT),
>  	KVM_ISA_EXT_ARR(ZBA),
>  	KVM_ISA_EXT_ARR(ZBB),
> +	KVM_ISA_EXT_ARR(ZBC),
>  	KVM_ISA_EXT_ARR(ZBS),
>  	KVM_ISA_EXT_ARR(ZICBOM),
>  	KVM_ISA_EXT_ARR(ZICBOZ),
> @@ -92,6 +93,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
>  	case KVM_RISCV_ISA_EXT_SVNAPOT:
>  	case KVM_RISCV_ISA_EXT_ZBA:
>  	case KVM_RISCV_ISA_EXT_ZBB:
> +	case KVM_RISCV_ISA_EXT_ZBC:
>  	case KVM_RISCV_ISA_EXT_ZBS:
>  	case KVM_RISCV_ISA_EXT_ZICNTR:
>  	case KVM_RISCV_ISA_EXT_ZICOND:
> -- 
> 2.34.1
>

Reviewed-by: Andrew Jones <ajones at ventanamicro.com>