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