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[Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU


From: Nelo
Subject: [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU
Date: Wed, 22 Mar 2023 22:32:07 -0000

This affected me. Took me several days.


The solution posted by asd fghjkl (ryzen27) worked for me as  well:

sudo nano /etc/modprobe.d/kvm.conf
options kvm ignore_msrs=1
and then rebooted

I'm very glad i found this thread. Don't know where to report this or if
it's even a bug, But hope it gets fixed!

-- 
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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

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