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

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Date:   Tue, 19 Sep 2023 11:59:42 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.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 11:07 AM Anup Patel <apatel@...tanamicro.com> 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: Atish Patra <atishp@...osinc.com>

-- 
Regards,
Atish