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

[chao zhou]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

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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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