A Fix Re: APM bug Re: [Qemu-devel] Re: Suggestion - trap window-close of VM

[Struan Bartlett <struan@praguespringpeople.org>]

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Hi -

For anyone running Windows 2000 on Qemu, I've developed a fix that makes 
APM - and therefore Windows 2000 shutdown - correctly 'power off' (i.e. 
close) Qemu.

I needed to patch the BIOS - which didn't implement the APM 1.2 16-bit 
protected mode interface that Windows 2000 apparently requires. 
Afterwards, as my Windows 2000 installation didn't have the APM driver 
installed, I simply needed to install it by going Control Panel => 
Add/Remove Hardware & Next => Add/Troubleshoot a device => Add a new 
device & Next => No, I want to select the hardware from a list & Next => 
NT Apm/Legacy Support & Next => Next (again) a few times. Afterwards, I 
did Control Panel => Power Options, chose the APM tab and made sure the 
Advanced Power Management support checkbox was ticked. I also chose the 
Hibernate tab and enabled Hibernate Support too. After rebooting, 
Windows 2000 now correctly instructs Qemu to shutdown at the appropriate 
moment. No patches to Qemu were required.

What doesn't work yet is Standby and Suspend, although I've generalised 
the APM Bios to support both of them. When attempting Standby (which 
doesn't always appear as an option - a problem I'm aware of), Windows 
tries to go into Standby but then reports that /"the device driver for 
the device is preventing this machine from entering standby. Please 
close all applications and try again. If the problem persists, you may 
need to update this driver."/ I don't know why this should be. By 
contrast, Suspend doesn't ever appear as an option - but it would be 
nice to make this trigger the Qemu savevm/loadvm facility.

You can find the Bios source patch as well as a precompiled 
patched-binary bios (for those who don't want to download the Bochs 
source) at http://www.praguespringpeople.org/Struan/Software/BochsBIOS/. 
Simply copy bios.bin-patchedAPM1.2 over your 
/usr/local/share/qemu/bios.bin (or better over pc-bios/bios.bin in your 
Qemu source directory and then do 'make install').

Struan


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