On 14/06/2017 15:11, Igor Mammedov wrote: >> No, KVM really uses the VCPU _index_ for HV_X64_MSR_VP_INDEX: > > and as you pointed out that works just by luck, > as soon as we there would be out of order created CPUs > returned value won't match cpu_index. > > So instead of spreading this nonsense out to QEMU, is it possible > to fix kernel(kvm+guest) to use apic_id instead?
Yes, definitely. At this point let's add a new "KVM_CAP_HYPERV_SYNIC2" capability and declare the old one broken, that will make things easier. Paolo
