On 03/11/2016 19:07, Radim Krčmář wrote: > 2016-11-03 17:00+0100, Paolo Bonzini: >> On 03/11/2016 16:03, Radim Krčmář wrote: >>> 2016-11-03 14:30+0100, Paolo Bonzini: >>>> On 26/10/2016 21:59, Radim Krčmář wrote: >>>>> 2016-10-14 20:21+0200, Paolo Bonzini: >>>>>> Calling apic_find_highest_irr results in IRR being scanned twice, >>>>>> once in vmx_sync_pir_from_irr and once in apic_search_irr. Change >>>>>> sync_pir_from_irr to do the RVI write and kvm_apic_update_irr to >>>>>> compute the new RVI on the fly. >>>>>> >>>>>> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> >>>>>> --- >>>>> >>>>> Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> >>>> >>>> Nope, this breaks nested VMX exit on external interrupt. For now I'm >>>> testing only patch 1 and will push that one only to kvm/next. > > Which hypervisor is being nested? vmx.flat. :) > I think a bug is likely for hypervisors that don't enable > PIN_BASED_EXT_INTR_MASK. The bug would trigger when > kvm_cpu_has_interrupt() in vmx_check_nested_events() in > kvm_arch_vcpu_runnable() queues the interrupt ... > but I didn't see how this would have caused a problem. :) Ironically, _not_ enabling PIN_BASED_EXT_INTR_MASK and not using HALT activity state is the only case that passes of the four that vmx.flat tests. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
