[PATCH v4 08/21] KVM: arm64: Support SDEI_EVENT_STATUS hypercall

Gavin Shan
2021-08-15T00:15:31Z

This supports SDEI_EVENT_STATUS hypercall. It's used by the guest
to retrieve a bitmap to indicate the SDEI event states, including
registration, enablement and delivery state.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kvm/sdei.c | 50 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index a3ba69dc91cb..b95b8c4455e1 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -367,6 +367,54 @@ static unsigned long kvm_sdei_hypercall_unregister(struct kvm_vcpu *vcpu)
return ret;
}

+static unsigned long kvm_sdei_hypercall_status(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);
+ int index = 0;
+ 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. None of the flags
+ * will be set if it doesn't exist.
+ */
+ spin_lock(&ksdei->lock);
+ kske = kvm_sdei_find_kvm_event(kvm, event_num);
+ if (!kske) {
+ ret = 0;
+ goto unlock;
+ }
+
+ index = (kse->state.type == SDEI_EVENT_TYPE_PRIVATE) ?
+ vcpu->vcpu_idx : 0;
+ if (kvm_sdei_is_registered(kske, index))
+ ret |= (1UL << SDEI_EVENT_STATUS_REGISTERED);
+ if (kvm_sdei_is_enabled(kske, index))
+ ret |= (1UL << SDEI_EVENT_STATUS_ENABLED);
+ if (kske->state.refcount)
+ ret |= (1UL << SDEI_EVENT_STATUS_RUNNING);
+
+unlock:
+ spin_unlock(&ksdei->lock);
+out:
+ return ret;
+}
+
int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
{
u32 func = smccc_get_function(vcpu);
@@ -395,6 +443,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
ret = kvm_sdei_hypercall_unregister(vcpu);
break;
case SDEI_1_0_FN_SDEI_EVENT_STATUS:
+ ret = kvm_sdei_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