[Qemu-devel] [Bug 1308341] Re: Multiple CPUs causes blue screen on Windows guest

[Krzysztof Cybulski]

It look like adding "hyperv" in "features" section to guest definition
helps, my Win7 VM  now is running for ~12h, when without "hyperv" it was
like 3-4 hour. I will test it for few days and will post here again.

  <features>
    <acpi/>
    <apic/>
    <pae/>
    <hyperv>
      <relaxed state='on'/>
    </hyperv>
  </features>

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https://bugs.launchpad.net/bugs/1308341

Title:
  Multiple CPUs causes blue screen on Windows guest

Status in QEMU:
  New
Status in “qemu” package in Ubuntu:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  Configuring a Windows 7 guest using more than one CPU cases the guest to 
fail. This happens after a few hours after guest boot. This is the error on the 
blue screen:
  "A clock interrupt was not received on a secondary processor within the 
allocated time interval"

  After resetting, the guest will never boot and a new bluescreen with
  the error "STOP: 0x0000005c" appears. Shutting down the guest
  completely and restarting it will allow it to boot and run for a few
  hours again.

  The guest was created using virt-manager. The error happens with or
  without virtio devices and with both 32-bit and 64-bit Windows 7
  guests.

  I am using Ubuntu 14.04 release candidate.

  qemu-kvm version 2.0.0~rc1+dfsg-0ubuntu3

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