Re: [Qemu-devel] KQEMU on Win32 (+patch)

[Elefterios Stamatogiannakis <estama@dblab.ece.ntua.gr>]

Filip Navara wrote:
>  > I'm trying to find out why qvm86 crashes the host (instant reboot 
> when right clicking on some icons on the guest desktop).
>  > So i thought if it is possible to use some code from kqemu-win32.c to 
> update qvm86-win32.c
> 
> No, I wrote both of the files and I can honestly tell you that copying 
> between them will not help. There is one known case where QVM86 on WinNT 
> platforms crashes the host machine and that's when NOEXECUTE support is 
> enabled (see boot.ini). The method QVM86 uses for executing the code 
> involves copying executable code into an allocated page which 
> unfortunately has the NX bit set. I have an experimental fix for this, 
> but I need someone with adequate environment (AMD64 and Win XP SP2+) to 
> test it... Of course host crash can be caused by other bug.
> 

I knew you wrote them both (who else could?). I was (wrongly) thinking 
that the qvm86 version is older than kqemu but apparently they work 
differently (thanks for the clarification).

As for the NOEXECUTE, i'm testing kqemu and qvm86 on a Athlon XP 
(regular 32bit, without NX). So the instant reboots must be from 
something else.

> You can compile it yourself on either Windows machine with MinGW or on 
> linux machine with MinGW cross-compiler. 

I tried to compile kqemu with MinGW without luck (although i didn't push 
it much). The error was:

kqemu-win32.o(.text+0x217):kqemu-win32.c: undefined reference to 
`_imp__MmMapIoSpace@16'

Probably it is that i don't have the windows driver development kit.

I'm temporary hosting a set of
> QEMU / KQEMU 0.7.1 for Windows binaries here: 
> http://www.volny.cz/xnavara/qemu-0.7.1.zip.

Do these binaries include your latest patches?

teris.

ps I cannot imagine how a man can know that much about the windows 
internals and at the same time be comfortable working with linux device 
drivers stuff.