This supports SDEI_EVENT_STATUS hypercall. It's used by the guest
to retrieve the status about the specified SDEI event. A bitmap
is returned to indicate the corresponding status, including
registration, enablement and delivery state.
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/kvm/sdei.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 36eda31e0392..5c43c8912ea1 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -454,6 +454,46 @@ static unsigned long hypercall_unregister(struct kvm_vcpu *vcpu)
return ret;
}
+static unsigned long hypercall_status(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_exposed_event *exposed_event;
+ struct kvm_sdei_registered_event *registered_event;
+ unsigned long event_num = smccc_get_arg1(vcpu);
+ int index;
+ unsigned long ret = 0;
+
+ if (!kvm_sdei_is_supported(event_num)) {
+ ret = SDEI_INVALID_PARAMETERS;
+ goto out;
+ }
+
+ spin_lock(&ksdei->lock);
+
+ /*
+ * Check if the registered event exists. None of the flags
+ * will be set if it doesn't exist.
+ */
+ registered_event = find_registered_event(kvm, event_num);
+ if (!registered_event)
+ goto unlock;
+
+ exposed_event = registered_event->exposed_event;
+ index = kvm_sdei_vcpu_index(vcpu, exposed_event);
+ if (kvm_sdei_is_registered(registered_event, index))
+ ret |= (1UL << SDEI_EVENT_STATUS_REGISTERED);
+ if (kvm_sdei_is_enabled(registered_event, index))
+ ret |= (1UL << SDEI_EVENT_STATUS_ENABLED);
+ if (registered_event->vcpu_event_count > 0)
+ ret |= (1UL << SDEI_EVENT_STATUS_RUNNING);
+
+unlock:
+ spin_unlock(&ksdei->lock);
+out:
+ return ret;
+}
+
int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
@@ -500,6 +540,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
ret = hypercall_unregister(vcpu);
break;
case SDEI_1_0_FN_SDEI_EVENT_STATUS:
+ ret = hypercall_status(vcpu);
+ break;
case SDEI_1_0_FN_SDEI_EVENT_GET_INFO:
case SDEI_1_0_FN_SDEI_EVENT_ROUTING_SET:
case SDEI_1_0_FN_SDEI_PE_MASK:
--
2.23.0
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