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

[Paolo Bonzini]

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".

Paolo