On 2013-02-28 16:24, Michael S. Tsirkin wrote: > Another problem with PIO is support for physical virtio devices, > and nested virt: KVM currently programs all PIO accesses > to cause vm exit, so using this device in a VM will be slow. Not answering your question, but support for programming direct PIO access into KVM's I/O bitmap would be feasible. Such feature may have some value for assigned devices that use PIO more heavily. They cause lengthy user-space exists so far. Jan -- Siemens AG, Corporate Technology, CT RTC ITP SDP-DE Corporate Competence Center Embedded Linux -- 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
