Ubuntu
qemu-kvm package

  1. Bug #361754
  2. Comment #5

Comment 5 for bug 361754

Revision history for this message
Dustin Kirkland  (kirkland) wrote : Re: guest needs to boot with clock=acpi_pm

The issue is that some amd platforms (pre-Barcelona) are not able to have guests that use the tsc as a clock source.

Either:
 a) Hosts with these processors should disable cpu frequency scaling, or
 b) Guests should use clock=acpi_pm

We could add a check to the kvm or qemu binary to check if cpu frequency scaling is enabled and throw an error. Even this is imperfect, though, as you could still screw yourself if you enable it after the vm starts.

I'm forward this upstream to see what they think.

:-Dustin