Re: [Qemu-devel] [QEMU] Windows XP / Windows 95 / MS-DOS 6 regressions

[Hervé Poussineau]

Le 01/03/2016 16:12, Paolo Bonzini a écrit :
> On 28/02/2016 22:49, Hervé Poussineau wrote:
> > 3) MS-DOS 6 freezes when loading himem.sys since commit:
> > commit 1906b2af7c2345037d9b2fdf484b457b5acd09d1
> > Author: Richard Henderson <address@hidden>
> > Date: Thu Jul 2 13:59:21 2015 +0100
> >
> >      target-i386: Rearrange processing of 0F 01
> >
> >      Rather than nesting tests of OP, MOD, and RM, decode them
> >      all at once with a switch. Fixes incorrect decoding of
> >      AMD Pacifica extensions (aka vmrun et al) via op==2 path.
> >
> >      Signed-off-by: Richard Henderson <address@hidden>
> >
> > I'm starting QEMU with -cpu 486.
> > It works on master if I add -enable-kvm
>
> Please test the other patch I've just sent.  I have not looked at 2,
> but that patch seems to fix the Windows 98 setup CD for me besides
> fixing the problem with this commit.
>
> If it's not enough for your Windows 95 testcase, please try getting a
> trace with "-d in_asm,op_opt,int".

Windows 95 still doesn't work, even with your two patches applied.

The message is:

"A fatal exception 0E has occurred at 0137:FD512607. The current
application will be terminated.

* Press any key to terminate the current application.
* Press CTRL-ALT-DEL to restart your computer. You will
  lose any unsaved information in all applications.

Press any key to continue."

I can provide debug log by email if required.

I also tested Windows 98. The first part setup correctly work, but doesn't work 
just after the reboot (for the first boot).
The message is very similar to Windows 95.

Hervé