On Tue, Feb 1, 2022 at 12:24 AM Anup Patel <apatel@xxxxxxxxxxxxxxxx> wrote:
>
> The SBI v0.3 specification extends SBI HSM extension by adding SBI HSM
> suspend call and related HART states. This patch extends the KVM RISC-V
> HSM implementation to provide KVM guest a minimal SBI HSM suspend call
> which is equivalent to a WFI instruction.
>
> Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
> ---
> arch/riscv/kvm/vcpu_sbi_hsm.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/arch/riscv/kvm/vcpu_sbi_hsm.c b/arch/riscv/kvm/vcpu_sbi_hsm.c
> index 1ac4b2e8e4ec..239dec0a628a 100644
> --- a/arch/riscv/kvm/vcpu_sbi_hsm.c
> +++ b/arch/riscv/kvm/vcpu_sbi_hsm.c
> @@ -61,6 +61,8 @@ static int kvm_sbi_hsm_vcpu_get_status(struct kvm_vcpu *vcpu)
> return -EINVAL;
> if (!target_vcpu->arch.power_off)
> return SBI_HSM_STATE_STARTED;
> + else if (vcpu->stat.generic.blocking)
> + return SBI_HSM_STATE_SUSPENDED;
> else
> return SBI_HSM_STATE_STOPPED;
> }
> @@ -91,6 +93,18 @@ static int kvm_sbi_ext_hsm_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
> ret = 0;
> }
> break;
> + case SBI_EXT_HSM_HART_SUSPEND:
> + switch (cp->a0) {
> + case SBI_HSM_SUSPEND_RET_DEFAULT:
> + kvm_riscv_vcpu_wfi(vcpu);
> + break;
> + case SBI_HSM_SUSPEND_NON_RET_DEFAULT:
> + ret = -EOPNOTSUPP;
> + break;
> + default:
> + ret = -EINVAL;
> + }
> + break;
> default:
> ret = -EOPNOTSUPP;
> }
> --
> 2.25.1
>
Reviewed-by: Atish Patra <atishp@xxxxxxxxxxxx>
--
Regards,
Atish
