linux-kernel - Re: [PATCH 1/9] RISC-V: KVM: Fix reg_val check in kvm_riscv_vcpu_set_reg

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Date:   Mon, 28 Nov 2022 13:03:46 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] RISC-V: KVM: Fix reg_val check in kvm_riscv_vcpu_set_reg_config()

On Mon, Nov 28, 2022 at 8:14 AM Anup Patel <apatel@...tanamicro.com> wrote:
>
> The reg_val check in kvm_riscv_vcpu_set_reg_config() should only
> be done for isa config register.
>
> Fixes: 9bfd900beeec ("RISC-V: KVM: Improve ISA extension by using a bitmap")
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  arch/riscv/kvm/vcpu.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
> index 17d5b3f8c2ee..982a3f5e7130 100644
> --- a/arch/riscv/kvm/vcpu.c
> +++ b/arch/riscv/kvm/vcpu.c
> @@ -296,12 +296,15 @@ static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu,
>         if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
>                 return -EFAULT;
>
> -       /* This ONE REG interface is only defined for single letter extensions */
> -       if (fls(reg_val) >= RISCV_ISA_EXT_BASE)
> -               return -EINVAL;
> -
>         switch (reg_num) {
>         case KVM_REG_RISCV_CONFIG_REG(isa):
> +               /*
> +                * This ONE REG interface is only defined for
> +                * single letter extensions.
> +                */
> +               if (fls(reg_val) >= RISCV_ISA_EXT_BASE)
> +                       return -EINVAL;
> +
>                 if (!vcpu->arch.ran_atleast_once) {
>                         /* Ignore the enable/disable request for certain extensions */
>                         for (i = 0; i < RISCV_ISA_EXT_BASE; i++) {
> --
> 2.34.1
>


Reviewed-by: Atish Patra <atishp@...osinc.com>
-- 
Regards,
Atish