linux-kernel - Re: [PATCH v2 03/11] RISC-V: KVM: Return correct code for hsm stop function

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Message-ID: <CAHBxVyFokVx0C+a8LvYrftE=JwuDAHgPRmhMQFtV9LHGqMuJgA@mail.gmail.com>
Date:   Thu, 12 Jan 2023 10:25:06 -0800
From:   Atish Kumar Patra <atishp@...osinc.com>
To:     Andrew Jones <ajones@...tanamicro.com>
Cc:     linux-kernel@...r.kernel.org, Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Guo Ren <guoren@...nel.org>, kvm-riscv@...ts.infradead.org,
        kvm@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Sergey Matyukevich <sergey.matyukevich@...tacore.com>,
        Eric Lin <eric.lin@...ive.com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v2 03/11] RISC-V: KVM: Return correct code for hsm stop function

On Thu, Jan 12, 2023 at 2:28 AM Andrew Jones <ajones@...tanamicro.com> wrote:
>
> On Thu, Dec 15, 2022 at 09:00:38AM -0800, Atish Patra wrote:
> > According to the SBI specification, the stop function can only
> > return error code SBI_ERR_FAILED. However, currently it returns
> > -EINVAL which will be mapped SBI_ERR_INVALID_PARAM.
>
> I presume the mapping referred to here is kvm_linux_err_map_sbi().
> If so, then -EPERM isn't correct either. That maps to SBI_ERR_DENIED.
> The only thing that will ensure we get SBI_ERR_FAILURE (-1) is
> anything not handled by the kvm_linux_err_map_sbi switch, as we
> need to use the default.
>

It returns SBI_ERR_FAILURE in the next patch when kvm_linux_err_map_sbi
is removed. Maybe I should drop this patch. The next patch does the
correct thing anyways.

> Thanks,
> drew
>
> >
> > Return the appropriate linux error code.
> >
> > Signed-off-by: Atish Patra <atishp@...osinc.com>
> > ---
> >  arch/riscv/kvm/vcpu_sbi_hsm.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/riscv/kvm/vcpu_sbi_hsm.c b/arch/riscv/kvm/vcpu_sbi_hsm.c
> > index 2e915ca..0f8d9fe 100644
> > --- a/arch/riscv/kvm/vcpu_sbi_hsm.c
> > +++ b/arch/riscv/kvm/vcpu_sbi_hsm.c
> > @@ -42,7 +42,7 @@ static int kvm_sbi_hsm_vcpu_start(struct kvm_vcpu *vcpu)
> >  static int kvm_sbi_hsm_vcpu_stop(struct kvm_vcpu *vcpu)
> >  {
> >       if (vcpu->arch.power_off)
> > -             return -EINVAL;
> > +             return -EPERM;
> >
> >       kvm_riscv_vcpu_power_off(vcpu);
> >
> > --
> > 2.25.1
> >