APICv 는 Guest OS가 APIC 을 Read/Write 할 때 VM Exit 가 발생하는데, 이를 해소하기 위한 H/W Feature 임
Intel Xeon E2600 v2 Family 이상부터 지원하는 기능
http://www.linux-kvm.org/wiki/images/7/70/2012-forum-nakajima_apicv.pdf
* Reviewing Unused and New Features for Interrupt/APIC Virtualization
http://www.linuxplumbersconf.org/2012/wp-content/uploads/2012/09/2012-lpc-virt-intel-vt-feat-nakajima.pdf
* APIC Virtualization Performance Testing and Iozone
https://software.intel.com/en-us/blogs/2013/12/17/apic-virtualization-performance-testing-and-iozone
* https://software.intel.com/en-us/blogs/2013/12/17/apic-virtualization-performance-testing-and-iozone