[Qemu-devel] [PATCH v3 0/5] hpet 'driftfix': alleviate time drift with HPET periodic timers

[Ulrich Obergfell <uobergfe@redhat.com>]

Hi,

This is version 3 of a series of patches that I originally posted in:

    http://lists.gnu.org/archive/html/qemu-devel/2011-03/msg01989.html
    http://lists.gnu.org/archive/html/qemu-devel/2011-03/msg01992.html
    http://lists.gnu.org/archive/html/qemu-devel/2011-03/msg01991.html
    http://lists.gnu.org/archive/html/qemu-devel/2011-03/msg01990.html

    http://article.gmane.org/gmane.comp.emulators.kvm.devel/69325
    http://article.gmane.org/gmane.comp.emulators.kvm.devel/69326
    http://article.gmane.org/gmane.comp.emulators.kvm.devel/69327
    http://article.gmane.org/gmane.comp.emulators.kvm.devel/69328

Changes since version 2:

 -  The vmstate related to 'driftfix' is now in a separate subsection
    that can be migrated conditionally.

 -  The new fields of the HPETTimer structure are no longer initialized
    in hpet_init(). This is now done in hpet_reset() only.

 -  Compensation of lost timer interrupts is now based on a backlog of
    unaccounted HPET clock periods instead of 'irqs_to_inject'. This
    eliminates the need to scale 'irqs_to_inject' when a guest o/s
    modifies the comparator register value.

Please review and please comment.

Regards,

Uli


Ulrich Obergfell (5):
  hpet 'driftfix': add hooks required to detect coalesced interrupts
    (x86 apic only)
  hpet 'driftfix': add driftfix property to HPETState and DeviceInfo
  hpet 'driftfix': add fields to HPETTimer and VMStateDescription
  hpet 'driftfix': add code in update_irq() to detect coalesced
    interrupts (x86 apic only)
  hpet 'driftfix': add code in hpet_timer() to compensate delayed
    callbacks and coalesced interrupts

 hw/apic.c |    4 ++
 hw/hpet.c |  114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 sysemu.h  |    3 ++
 vl.c      |    3 ++
 4 files changed, 120 insertions(+), 4 deletions(-)