linux-kernel - Re: [PATCH 2/4] RISC-V: KVM: Fix riscv_vcpu_get_isa_ext

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Message-ID: <20230920-baeb582c4f56bc5c59e23086@orel>
Date:   Wed, 20 Sep 2023 07:04:48 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shuah Khan <shuah@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/4] RISC-V: KVM: Fix riscv_vcpu_get_isa_ext_single() for
 missing extensions

On Mon, Sep 18, 2023 at 11:36:44PM +0530, Anup Patel wrote:
> The riscv_vcpu_get_isa_ext_single() should fail with -ENOENT error
> when corresponding ISA extension is not available on the host.
> 
> Fixes: e98b1085be79 ("RISC-V: KVM: Factor-out ONE_REG related code to its own source file")
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  arch/riscv/kvm/vcpu_onereg.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index e7e833ced91b..b7e0e03c69b1 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -460,8 +460,11 @@ static int riscv_vcpu_get_isa_ext_single(struct kvm_vcpu *vcpu,
>  	    reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
>  		return -ENOENT;
>  
> -	*reg_val = 0;
>  	host_isa_ext = kvm_isa_ext_arr[reg_num];
> +	if (!__riscv_isa_extension_available(NULL, host_isa_ext))
> +		return -ENOENT;
> +
> +	*reg_val = 0;
>  	if (__riscv_isa_extension_available(vcpu->arch.isa, host_isa_ext))
>  		*reg_val = 1; /* Mark the given extension as available */
>  
> -- 
> 2.34.1
>

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