[Qemu-devel] [PATCH v4 0/5] hpet 'driftfix': alleviate time drift with HPET periodic timers

[Ulrich Obergfell <uobergfe@redhat.com>]

Hi,

This is version 4 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 3:

 in patch part 1/5 and part 4/5

 -  Added stub functions for 'target_reset_irq_delivered' and
    'target_get_irq_delivered'. Added registration functions
    that are used by apic code to replace the stubs.

 -  Removed NULL pointer checks from update_irq().

 in patch part 5/5

 -  A minor modification in hpet_timer_has_tick_backlog().

 -  Renamed the local variable 'irq_count' in hpet_timer() to
    'period_count'.

 -  Driftfix-related fields in struct 'HPETTimer' are no longer
    being initialized/reset in hpet_reset(). Added the function
    hpet_timer_driftfix_reset() which is called when the guest

    .  sets the 'CFG_ENABLE' bit (overall enable)
       in the General Configuration Register.

    .  sets the 'TN_ENABLE' bit (timer N interrupt enable)
       in the Timer N Configuration and Capabilities Register.


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 |  119 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 hw/pc.h   |   13 +++++++
 vl.c      |   13 +++++++
 4 files changed, 145 insertions(+), 4 deletions(-)