[Qemu-devel] [Bug 1307225] Re: Running a virtual machine on a Haswell system produces machine check events

[Ilya Almametov]

Just my 2 cents. I have two Haswell boxes with Ubuntu Server 14.04 each
running bunch of VMs. The first one is Intel Core i7-4770K and it runs
only Linux VMs. There is no single MCE here for at least one year.  The
second box is Intel Core i7-4790K and it runs mix of Linux and Windows
2003 VMs. MCEs regularly appear in logs here.

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https://bugs.launchpad.net/bugs/1307225

Title:
  Running a virtual machine on a Haswell system produces machine check
  events

Status in QEMU:
  New

Bug description:
  I'm running a virtual Windows SBS 2003 installation on a Xeon E3
  Haswell system running Gentoo Linux. First, I used Qemu 1.5.3 (the
  latest stable version on Gentoo). I got a lot of machine check events
  ("mce: [Hardware Error]: Machine check events logged") in dmesg that
  always looked like (using mcelog):

  Hardware event. This is not a software error.
  MCE 0
  CPU 3 BANK 0
  TIME 1397455091 Mon Apr 14 07:58:11 2014
  MCG status:
  MCi status:
  Corrected error
  Error enabled
  MCA: Internal parity error
  STATUS 90000040000f0005 MCGSTATUS 0
  MCGCAP c09 APICID 6 SOCKETID 0
  CPUID Vendor Intel Family 6 Model 60

  I found this discussion on the vmware community:
  https://communities.vmware.com/thread/452344

  It seems that this is (at least partly) caused by the Qemu machine. I
  switched to Qemu 1.7.0, the first version to use "pc-i440fx-1.7". With
  this version, the errors almost disappeared, but from time to time, I
  still get machine check events. Anyways, they so not seem to affect
  neither the vm, nor the host.

  The Haswell machine has been set up and running for several days
  without a single error message. They only appear when the VM is
  running. so I think this is actually some problem with the Haswell
  architecture (and not a real hardware error).

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