This supports SDEI_EVENT_STATUS hypercall. It's used by guest
to retrieve the status about the specified event. A bitmap is
returned to indicate the corresponding status: registration,
enablement and servicing state.
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/kvm/sdei.c | 45 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index f774f2cf0ac7..b847c6028b74 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -247,6 +247,48 @@ static unsigned long hypercall_unregister(struct kvm_vcpu *vcpu)
return ret;
}
+static unsigned long hypercall_status(struct kvm_vcpu *vcpu)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_vcpu_context *context;
+ struct kvm_sdei_exposed_event *exposed_event;
+ struct kvm_sdei_event *event;
+ unsigned int num = smccc_get_arg(vcpu, 1);
+ unsigned long ret = 0;
+
+ if (!kvm_sdei_is_supported(num)) {
+ ret = SDEI_INVALID_PARAMETERS;
+ goto out;
+ }
+
+ spin_lock(&vsdei->lock);
+
+ /*
+ * Check if the event exists. None of the flags will be set
+ * if it doesn't exist.
+ */
+ event = find_event(vcpu, num);
+ if (!event)
+ goto unlock;
+
+ if (kvm_sdei_is_registered(event))
+ ret |= (1UL << SDEI_EVENT_STATUS_REGISTERED);
+ if (kvm_sdei_is_enabled(event))
+ ret |= (1UL << SDEI_EVENT_STATUS_ENABLED);
+
+ exposed_event = event->exposed_event;
+ context = kvm_sdei_is_critical(exposed_event->priority) ?
+ &vsdei->context[SDEI_EVENT_PRIORITY_CRITICAL] :
+ &vsdei->context[SDEI_EVENT_PRIORITY_NORMAL];
+ if (context->event == event)
+ ret |= (1UL << SDEI_EVENT_STATUS_RUNNING);
+
+unlock:
+ spin_unlock(&vsdei->lock);
+out:
+ return ret;
+}
+
int kvm_sdei_call(struct kvm_vcpu *vcpu)
{
struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
@@ -283,6 +325,9 @@ int kvm_sdei_call(struct kvm_vcpu *vcpu)
case SDEI_1_0_FN_SDEI_EVENT_UNREGISTER:
ret = hypercall_unregister(vcpu);
break;
+ case SDEI_1_0_FN_SDEI_EVENT_STATUS:
+ ret = hypercall_status(vcpu);
+ break;
default:
ret = SDEI_NOT_SUPPORTED;
}
--
2.23.0
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