[PATCH v3 10/19] KVM: Create helper for setting a system event exit

[Anup Patel]

On Wed, Feb 23, 2022 at 9:49 AM Oliver Upton <oupton at google.com> wrote:
>
> Create a helper that appropriately configures kvm_run for a system event
> exit.
>
> No functional change intended.
>
> Suggested-by: Marc Zyngier <maz at kernel.org>
> Signed-off-by: Oliver Upton <oupton at google.com>

Looks good to me.

For KVM RISC-V:
Acked-by: Anup Patel <anup at brainfault.org>

Regards,
Anup

> ---
>  arch/arm64/kvm/psci.c         | 4 +---
>  arch/riscv/kvm/vcpu_sbi_v01.c | 4 +---
>  arch/x86/kvm/x86.c            | 6 ++----
>  include/linux/kvm_host.h      | 7 +++++++
>  4 files changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
> index 41adaaf2234a..2bb8d047cde4 100644
> --- a/arch/arm64/kvm/psci.c
> +++ b/arch/arm64/kvm/psci.c
> @@ -193,9 +193,7 @@ static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type)
>                 tmp->arch.mp_state = KVM_MP_STATE_STOPPED;
>         kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
>
> -       memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
> -       vcpu->run->system_event.type = type;
> -       vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> +       kvm_vcpu_set_system_event_exit(vcpu, type);
>  }
>
>  static void kvm_psci_system_off(struct kvm_vcpu *vcpu)
> diff --git a/arch/riscv/kvm/vcpu_sbi_v01.c b/arch/riscv/kvm/vcpu_sbi_v01.c
> index 07e2de14433a..7a197d5658d7 100644
> --- a/arch/riscv/kvm/vcpu_sbi_v01.c
> +++ b/arch/riscv/kvm/vcpu_sbi_v01.c
> @@ -24,9 +24,7 @@ static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
>                 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;
> +       kvm_vcpu_set_system_event_exit(vcpu, type);
>  }
>
>  static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 7131d735b1ef..109751f89ee3 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -9903,14 +9903,12 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
>                 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
>                         kvm_vcpu_reload_apic_access_page(vcpu);
>                 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) {
> -                       vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> -                       vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
> +                       kvm_vcpu_set_system_event_exit(vcpu, KVM_SYSTEM_EVENT_CRASH);
>                         r = 0;
>                         goto out;
>                 }
>                 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) {
> -                       vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> -                       vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET;
> +                       kvm_vcpu_set_system_event_exit(vcpu, KVM_SYSTEM_EVENT_RESET);
>                         r = 0;
>                         goto out;
>                 }
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index f11039944c08..9085a1b1569a 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -2202,6 +2202,13 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
>  }
>  #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */
>
> +static inline void kvm_vcpu_set_system_event_exit(struct kvm_vcpu *vcpu, u32 type)
> +{
> +       memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
> +       vcpu->run->system_event.type = type;
> +       vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> +}
> +
>  /*
>   * This defines how many reserved entries we want to keep before we
>   * kick the vcpu to the userspace to avoid dirty ring full.  This
> --
> 2.35.1.473.g83b2b277ed-goog
>