[Qemu-devel] [Bug 979714] Re: Guest timer interrupt isn't switched off when local timer is enabled

[chao zhou]

** Attachment added: "dmesg in guest"
   
https://bugs.launchpad.net/bugs/979714/+attachment/3051557/+files/timerdmesg.log

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https://bugs.launchpad.net/bugs/979714

Title:
  Guest timer interrupt isn't switched off when local timer is enabled

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows): Linux(RHEL6u1)
  kvm.git Commit:4f324a1b
  qemu-kvm Commit:  b5ed4b6f 
  Host Kernel Version:3.3.0-rc5
  Hardware: Romley-EP, WSM-EP
  Bug detailed description:
  --------------------------
  Start a guest and check into /proc/interrupts, the timer interrupt will
  constantly increase while local timer interrups are already increasing.
  qemu-kvm commit: 9d636ae7  doesn't have this issue.
  The dmesg of the guest shows:
  APIC calibration not consistent with PM-Timer: 191ms instead of 100ms

  This should be a qemu-kvm bug.
  kvm + qemu-kvm = result
  4f324a1b + b5ed4b6f = bad
  4f324a1b + 9d636ae7 = good
  Reproduce steps:
  ----------------
  1. start up a host with kvm kernel
  2. qemu-system-x86_64 –m 1024 –smp 2 –net none –hda /root/rhel6u1.img
  3. cat /proc/interrupts
  Current result:
  ----------------
  interrupt 0 keeps increasing

  Expected result:
  ----------------
  interrupt 0 stops at some value and doesn't increase

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