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RISC-V: KVM: Implement SBI HSM suspend call

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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@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2022-01-31 12:31:36 +05:30 committed by Anup Patel
parent c9d3b5bd26
commit 763c8bed8c
1 changed files with 14 additions and 0 deletions
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14
arch/riscv/kvm/vcpu_sbi_hsm.c
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@ -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;
}