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#
# Copyright 2010, 2013 Red Hat, Inc.
#
# This work is licensed under the GNU GPLv2 or later.
# See the COPYING file in the top-level directory.
from ..xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
class _ClockTimer(XMLBuilder):
XML_NAME = "timer"
name = XMLProperty("./@name")
present = XMLProperty("./@present", is_yesno=True)
tickpolicy = XMLProperty("./@tickpolicy")
class DomainClock(XMLBuilder):
XML_NAME = "clock"
offset = XMLProperty("./@offset")
timers = XMLChildProperty(_ClockTimer)
##################
# Default config #
##################
def set_defaults(self, guest):
if not guest.os.is_hvm():
return
if self.offset is None:
self.offset = guest.osinfo.get_clock()
if self.timers:
return
if not guest.os.is_x86():
return
if not self.conn.is_qemu():
return
# Set clock policy that maps to qemu options:
# -no-hpet -no-kvm-pit-reinjection -rtc driftfix=slew
#
# hpet: Is unneeded and has a performance penalty
# pit: While it has no effect on windows, it doesn't hurt and
# is beneficial for linux
#
# If libvirt/qemu supports it and using a windows VM, also
# specify hypervclock.
#
# This is what has been recommended by the RH qemu guys :)
rtc = self.timers.add_new()
rtc.name = "rtc"
rtc.tickpolicy = "catchup"
pit = self.timers.add_new()
pit.name = "pit"
pit.tickpolicy = "delay"
hpet = self.timers.add_new()
hpet.name = "hpet"
hpet.present = False
if (guest.hyperv_supported() and
self.conn.check_support(self.conn.SUPPORT_CONN_HYPERV_CLOCK)):
hyperv = self.timers.add_new()
hyperv.name = "hypervclock"
hyperv.present = True
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