Difference between revisions of "Virtualization"

From RCS Wiki
Jump to navigation Jump to search
m (→‎Running 64k guests on 4k hosts: Add reference to describe libvirt XML section)
m (→‎Running 64k guests on 4k hosts: Add reference to describe libvirt XML section)
 
(No difference)

Latest revision as of 12:41, 8 November 2021


Running 64k guests on 4k hosts

When trying to start a VM on a host running with 4k pages, you might see the following error message:

qemu-system-ppc64: Can't support 64 kiB guest pages with 4 kiB host pages with this KVM implementation

There is an easy workaround for this. If running QEMU directly, add the argument -machine pseries,cap-hpt-max-page-size=4096. If running QEMU via libvirt, add the following section[1] to the guest's libvirt XML (via virsh edit [guest name] or the XML tab in virt-manager):

  <features>
    <hpt>
      <maxpagesize unit='KiB'>4</maxpagesize>
    </hpt>
  </features>

Further Information

  • https://gitlab.com/libvirt/libvirt/-/issues/227#note_705948269