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 <[email protected]> --- 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 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
