On 05/06/20 11:41, Li,Rongqing wrote: >> >> As you said, "Pass-though: it is only suitable for KVM_HINTS_REALTIME", which >> means, KVM needs to make sure the kvm->arch.aperfmperf_mode value could >> "only" be set to KVM_APERFMPERF_PT when the check >> kvm_para_has_hint(KVM_HINTS_REALTIME) is passed. >> > pining vcpu can ensure that guest get correct mperf/aperf, but a user > has the choice to not pin, at that condition, do not think it is bug, this wants to say Also, userspace can also pin without exposing KVM_HINTS_REALTIME. So it's better not to check. Paolo
