[Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load.

[Gleb Natapov <gleb@redhat.com>]

Qemu device emulation for timers might be inaccurate and
causes coalescing of several IRQs into one. It happens when the
load on the host is high and the guest did not manage to ack the
previous IRQ. The problem can be reproduced by copying of a big
file or many small ones inside Windows guest. When you do that 
guest clock start to lag behind the host one.

The first patch in the series changes qemu_irq subsystem to return
IRQ delivery status information. If device is notified that IRQs
where lost it can regenerate them as needed. The following two
patches add IRQ regeneration to PIC and RTC devices.

---

Gleb Natapov (3):
      Fix time drift problem under high load when RTC is in use.
      Fix time drift problem under high load when PIT is in use.
      Change qemu_set_irq() to return status information.


 hw/apic.c          |  103 +++++++++++++++++++++++++++++++++-------------------
 hw/arm_gic.c       |    6 ++-
 hw/arm_pic.c       |    4 ++
 hw/arm_timer.c     |    4 +-
 hw/cbus.c          |   12 +++++-
 hw/esp.c           |    4 ++
 hw/etraxfs_pic.c   |   12 ++++--
 hw/fdc.c           |    4 ++
 hw/heathrow_pic.c  |    4 ++
 hw/i8254.c         |   23 +++++++++++-
 hw/i8259.c         |   19 +++++++---
 hw/ide.c           |    8 +++-
 hw/integratorcp.c  |    4 ++
 hw/irq.c           |   18 +++++++--
 hw/irq.h           |   35 ++++++++++++------
 hw/max7310.c       |    4 ++
 hw/mc146818rtc.c   |   11 +++++-
 hw/mcf5206.c       |    4 ++
 hw/mcf_intc.c      |    6 ++-
 hw/mips_int.c      |    6 ++-
 hw/mpcore.c        |    4 ++
 hw/mst_fpga.c      |    4 ++
 hw/musicpal.c      |    4 ++
 hw/nseries.c       |    7 +++-
 hw/omap.h          |    2 +
 hw/omap1.c         |   44 +++++++++++++++++-----
 hw/omap2.c         |   12 +++++-
 hw/omap_dma.c      |    8 +++-
 hw/omap_mmc.c      |    4 ++
 hw/openpic.c       |    4 ++
 hw/palm.c          |    4 ++
 hw/pc.c            |    4 ++
 hw/pc.h            |    2 +
 hw/pci.c           |    8 +++-
 hw/pcnet.c         |    4 ++
 hw/pl061.c         |    4 ++
 hw/pl190.c         |    4 ++
 hw/ppc.c           |   18 ++++++---
 hw/ppc4xx_devs.c   |    6 ++-
 hw/pxa2xx.c        |    4 ++
 hw/pxa2xx_gpio.c   |    6 ++-
 hw/pxa2xx_pcmcia.c |    6 ++-
 hw/pxa2xx_pic.c    |    4 ++
 hw/rc4030.c        |    4 ++
 hw/sbi.c           |    6 ++-
 hw/sharpsl.h       |    2 +
 hw/slavio_intctl.c |    8 +++-
 hw/sparc32_dma.c   |    4 ++
 hw/spitz.c         |   20 ++++++++--
 hw/ssd0323.c       |    4 ++
 hw/stellaris.c     |   10 ++++-
 hw/sun4c_intctl.c  |    4 ++
 hw/sun4m.c         |    7 +++-
 hw/tc6393xb.c      |    5 ++-
 hw/tusb6010.c      |    4 ++
 hw/twl92230.c      |    8 +++-
 hw/versatilepb.c   |    4 ++
 hw/zaurus.c        |    4 ++
 58 files changed, 392 insertions(+), 160 deletions(-)

-- 
        Gleb.