x86: 0.855 architecture: 0.836 semantic: 0.835 kernel: 0.761 device: 0.738 ppc: 0.701 user-level: 0.692 files: 0.677 performance: 0.650 PID: 0.647 socket: 0.617 graphic: 0.610 permissions: 0.595 arm: 0.593 mistranslation: 0.591 peripherals: 0.578 vnc: 0.572 TCG: 0.533 register: 0.533 boot: 0.533 network: 0.529 risc-v: 0.467 VMM: 0.399 hypervisor: 0.395 debug: 0.383 KVM: 0.283 assembly: 0.254 virtual: 0.245 i386: 0.087 -------------------- user-level: 0.857 debug: 0.205 x86: 0.159 hypervisor: 0.149 virtual: 0.076 files: 0.041 TCG: 0.027 register: 0.025 PID: 0.018 device: 0.014 semantic: 0.011 socket: 0.010 kernel: 0.009 network: 0.008 boot: 0.007 assembly: 0.006 risc-v: 0.005 arm: 0.004 architecture: 0.004 performance: 0.004 VMM: 0.003 vnc: 0.002 graphic: 0.002 peripherals: 0.001 i386: 0.001 mistranslation: 0.001 permissions: 0.001 KVM: 0.001 ppc: 0.000 Unexpected error: "AioContext polling is not implemented on Windows" When run it this error happens: Unexpected error in aio_context_set_poll_params() at /home/stefan/src/qemu/repo.or.cz/qemu/ar7/util/aio-win32.c:413: C:\Program Files\qemu\qemu-system-x86_64.exe: AioContext polling is not implemented on Windows This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. System: Windows 10 x64 Which version of QEMU are you using? And which parameters are you using when you start it? I have that message too with this version: c:\Tools\QEMU>qemu-system-aarch64.exe -version QEMU emulator version 2.11.90 (v2.12.0-rc0-11704-g30195e9d53-dirty) My launch params are: C:\TOOLS\QEMU\qemu-system-aarch64.exe -M raspi3 -kernel D:\QEMU-img\2017-12-04-pcudev01l.img My system is Windows 7 64bit The qemu package downloaded is the 64bit version. Fixed in qemu.git/master and due to be released in QEMU 2.12: commit 90c558beca0c0ef26db1ed77d1eb8f24a5ea02a1 Author: Peter Xu