boot: 0.697 arm: 0.682 architecture: 0.680 device: 0.674 performance: 0.662 graphic: 0.587 socket: 0.560 mistranslation: 0.489 network: 0.464 semantic: 0.419 register: 0.307 debug: 0.249 risc-v: 0.237 kernel: 0.235 peripherals: 0.208 vnc: 0.198 user-level: 0.181 PID: 0.166 VMM: 0.164 permissions: 0.141 files: 0.134 assembly: 0.113 virtual: 0.101 hypervisor: 0.092 ppc: 0.079 TCG: 0.070 i386: 0.038 x86: 0.027 KVM: 0.015 SBSA ACS test freezes inside qemu-system-aarch64 In an effort to get Windows 10 for ARM64 (which is supposed to boot on SBSA/SBBR-compliant platforms) to boot inside qemu, I tried to run the SBSA ACS test suite. I used the UEFI image from the latest Linaro snapshot, and built the SBSA ACS UEFI application from https://github.com/ARM-software/sbsa-acs myself using a Linaro aarch64 compiler. Test #8 causes an infinite exception loop, as the exception vectors themselves somehow become inaccessible, and accessing them triggers another exception to be handled by the same vector. (With some older Linaro UEFI images, the hard lockup is avoided, and the SBSA UEFI app crashes instead.) If I disable that test, the testsuite locks up in other tests in very similar ways. We aren't even able to get a pass/fail score from the app because of this. Which version of QEMU did you test? Does it work better with the latest version of QEMU now? [Expired for QEMU because there has been no activity for 60 days.]