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

[Joel Schopp]

** Tags added: windows

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Windows XP x64 / 2008 Server x64 broken on 32-bit hosts with QEMU > 0.9.0
https://bugs.launchpad.net/bugs/521202
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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.