[PATCH v4 09/21] KVM: arm64: Support SDEI_EVENT_GET_INFO hypercall

Gavin Shan
2021-08-15T00:15:36Z

This supports SDEI_EVENT_GET_INFO hypercall. It's used by the guest
to retrieve various information about the supported (exported) events,
including type, signaled, route mode and affinity for the shared
events.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kvm/sdei.c | 76 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index b95b8c4455e1..5dfa74b093f1 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -415,6 +415,80 @@ static unsigned long kvm_sdei_hypercall_status(struct kvm_vcpu *vcpu)
return ret;
}

+static unsigned long kvm_sdei_hypercall_info(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_event *kse = NULL;
+ struct kvm_sdei_kvm_event *kske = NULL;
+ unsigned long event_num = smccc_get_arg1(vcpu);
+ unsigned long event_info = smccc_get_arg2(vcpu);
+ unsigned long ret = SDEI_SUCCESS;
+
+ /* Sanity check */
+ if (!(ksdei && vsdei)) {
+ ret = SDEI_NOT_SUPPORTED;
+ goto out;
+ }
+
+ if (!kvm_sdei_is_valid_event_num(event_num)) {
+ ret = SDEI_INVALID_PARAMETERS;
+ goto out;
+ }
+
+ /*
+ * Check if the KVM event exists. The event might have been
+ * registered, we need fetch the information from the registered
+ * event in that case.
+ */
+ spin_lock(&ksdei->lock);
+ kske = kvm_sdei_find_kvm_event(kvm, event_num);
+ kse = kske ? kske->kse : NULL;
+ if (!kse) {
+ kse = kvm_sdei_find_event(kvm, event_num);
+ if (!kse) {
+ ret = SDEI_INVALID_PARAMETERS;
+ goto unlock;
+ }
+ }
+
+ /* Retrieve the requested information */
+ switch (event_info) {
+ case SDEI_EVENT_INFO_EV_TYPE:
+ ret = kse->state.type;
+ break;
+ case SDEI_EVENT_INFO_EV_SIGNALED:
+ ret = kse->state.signaled;
+ break;
+ case SDEI_EVENT_INFO_EV_PRIORITY:
+ ret = kse->state.priority;
+ break;
+ case SDEI_EVENT_INFO_EV_ROUTING_MODE:
+ case SDEI_EVENT_INFO_EV_ROUTING_AFF:
+ if (kse->state.type != SDEI_EVENT_TYPE_SHARED) {
+ ret = SDEI_INVALID_PARAMETERS;
+ break;
+ }
+
+ if (event_info == SDEI_EVENT_INFO_EV_ROUTING_MODE) {
+ ret = kske ? kske->state.route_mode :
+ SDEI_EVENT_REGISTER_RM_ANY;
+ } else {
+ ret = kske ? kske->state.route_affinity : 0;
+ }
+
+ break;
+ default:
+ ret = SDEI_INVALID_PARAMETERS;
+ }
+
+unlock:
+ spin_unlock(&ksdei->lock);
+out:
+ return ret;
+}
+
int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
{
u32 func = smccc_get_function(vcpu);
@@ -446,6 +520,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
ret = kvm_sdei_hypercall_status(vcpu);
break;
case SDEI_1_0_FN_SDEI_EVENT_GET_INFO:
+ ret = kvm_sdei_hypercall_info(vcpu);
+ break;
case SDEI_1_0_FN_SDEI_EVENT_ROUTING_SET:
case SDEI_1_0_FN_SDEI_PE_MASK:
case SDEI_1_0_FN_SDEI_PE_UNMASK:
--
2.23.0