linux-kernel - Re: [PATCH 2/6] RISC-V: KVM: Add common kvm_riscv_vcpu_sbi_system

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Date:   Tue, 22 Feb 2022 15:54:55 -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>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        KVM General <kvm@...r.kernel.org>,
        kvm-riscv@...ts.infradead.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] RISC-V: KVM: Add common kvm_riscv_vcpu_sbi_system_reset()
 function

On Tue, Feb 1, 2022 at 12:23 AM Anup Patel <apatel@...tanamicro.com> wrote:
>
> We rename kvm_sbi_system_shutdown() to kvm_riscv_vcpu_sbi_system_reset()
> and move it to vcpu_sbi.c so that it can be shared by SBI v0.1 shutdown
> and SBI v0.3 SRST extension.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  arch/riscv/include/asm/kvm_vcpu_sbi.h |  3 +++
>  arch/riscv/kvm/vcpu_sbi.c             | 17 +++++++++++++++++
>  arch/riscv/kvm/vcpu_sbi_v01.c         | 18 ++----------------
>  3 files changed, 22 insertions(+), 16 deletions(-)
>
> diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
> index 04cd81f2ab5b..83d6d4d2b1df 100644
> --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
> +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
> @@ -28,6 +28,9 @@ struct kvm_vcpu_sbi_extension {
>  };
>
>  void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
> +void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,
> +                                    struct kvm_run *run,
> +                                    u32 type, u64 flags);
>  const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(unsigned long extid);
>
>  #endif /* __RISCV_KVM_VCPU_SBI_H__ */
> diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
> index 78aa3db76225..11ae4f621f0d 100644
> --- a/arch/riscv/kvm/vcpu_sbi.c
> +++ b/arch/riscv/kvm/vcpu_sbi.c
> @@ -79,6 +79,23 @@ void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
>         run->riscv_sbi.ret[1] = cp->a1;
>  }
>
> +void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,
> +                                    struct kvm_run *run,
> +                                    u32 type, u64 flags)
> +{
> +       unsigned long i;
> +       struct kvm_vcpu *tmp;
> +
> +       kvm_for_each_vcpu(i, tmp, vcpu->kvm)
> +               tmp->arch.power_off = true;
> +       kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
> +
> +       memset(&run->system_event, 0, sizeof(run->system_event));
> +       run->system_event.type = type;
> +       run->system_event.flags = flags;
> +       run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> +}
> +
>  int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  {
>         struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
> diff --git a/arch/riscv/kvm/vcpu_sbi_v01.c b/arch/riscv/kvm/vcpu_sbi_v01.c
> index 2ab52b6d9ed3..da4d6c99c2cf 100644
> --- a/arch/riscv/kvm/vcpu_sbi_v01.c
> +++ b/arch/riscv/kvm/vcpu_sbi_v01.c
> @@ -14,21 +14,6 @@
>  #include <asm/kvm_vcpu_timer.h>
>  #include <asm/kvm_vcpu_sbi.h>
>
> -static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
> -                                   struct kvm_run *run, u32 type)
> -{
> -       unsigned long i;
> -       struct kvm_vcpu *tmp;
> -
> -       kvm_for_each_vcpu(i, tmp, vcpu->kvm)
> -               tmp->arch.power_off = true;
> -       kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
> -
> -       memset(&run->system_event, 0, sizeof(run->system_event));
> -       run->system_event.type = type;
> -       run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> -}
> -
>  static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
>                                       unsigned long *out_val,
>                                       struct kvm_cpu_trap *utrap,
> @@ -80,7 +65,8 @@ static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
>                 }
>                 break;
>         case SBI_EXT_0_1_SHUTDOWN:
> -               kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
> +               kvm_riscv_vcpu_sbi_system_reset(vcpu, run,
> +                                               KVM_SYSTEM_EVENT_SHUTDOWN, 0);
>                 *exit = true;
>                 break;
>         case SBI_EXT_0_1_REMOTE_FENCE_I:
> --
> 2.25.1
>

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