Commit 763c8bed authored by Anup Patel's avatar Anup Patel Committed by Anup Patel
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RISC-V: KVM: Implement SBI HSM suspend call 



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: default avatarAnup Patel <apatel@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent c9d3b5bd

arch/riscv/kvm/vcpu_sbi_hsm.c

+14 −0
Original line number Diff line number Diff line
@@ -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;

	}