[Qemu-devel] [Bug 521202] Re: Windows XP x64 / 2008 Server x64 broken on 32-bit hosts with QEMU > 0.9.0

[Christopher Yeleighton]

The installer flashes the keyboard LED and clears the screen at that
point when run on physical hardware.

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https://bugs.launchpad.net/bugs/521202

Title:
  Windows XP x64 / 2008 Server x64 broken on 32-bit hosts with QEMU >
  0.9.0

Status in QEMU:
  New

Bug description:
  QEMU >0.9.0 fails to install/run 64-bit Windows XP guests on 32-bit
  hosts. This is mentioned here: http://qemu-
  forum.ipi.fi/viewtopic.php?f=5&t=4625 . As explained there, 0.9.0
  manages to install and run XP64 fine, if somewhat slowly. The host is
  an actual 32-bit CPU (Athlon XP), although I've tested it and
  confirmed the bug to occur on a Core2 Duo CPU running in 32-bit mode
  with KVM disabled. It's impossible to test with KVM enabled, as this
  causes Windows to detect a 32-bit CPU and refuse to run.

  When installing, the installer hangs at the "Setup is starting
  Windows" step. An attempt at running a converted VBox image reveals
  the problem lies somewhere in the ACPI -- in safe mode, the boot
  sequence gets to loading ACPI tables, then hangs indefinitely.
  Interestingly enough, the emulator itself runs fine, you can interact
  with the monitor etc., but the virtual CPU appears to stop; there's a
  marked point in "log cpu" output after which nothing comes. Disabling
  ACPI predictably does nothing to help, as in this case Windows refuses
  to run.

  I've tested with several versions, and 0.9.1 is the first one to
  break. The bug is still present in 0.11 and 0.12 as packaged by
  Ubuntu.

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