Found the same problem using Gnome boxes, as I understand it uses QEMU. Error I see in gnome boxes when I'm trying to install windows 10 vm: SYSTEM THREAD EXCEPTION NOT HANDLED
Fresh install of Ubuntu 22.04 CPU: AMD Ryzen 7 1700 The solution posted by asd fghjkl (ryzen27) worked for me too: sudo nano /etc/modprobe.d/kvm.conf add "options kvm ignore_msrs=1" (without quotes) reboot -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1703506 Title: SMT not supported by QEMU on AMD Ryzen CPU Status in QEMU: Expired Bug description: HyperThreading/SMT is supported by AMD Ryzen CPUs but results in this message when setting the topology to threads=2: qemu-system-x86_64: AMD CPU doesn't support hyperthreading. Please configure -smp options properly. Checking in a Windows 10 guest reveals that SMT is not enabled, and from what I understand, QEMU converts the topology from threads to cores internally on AMD CPUs. This appears to cause performance problems in the guest perhaps because programs are assuming that these threads are actual cores. Software: Linux 4.12, qemu 2.9.0 host with KVM enabled, Windows 10 pro guest To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1703506/+subscriptions