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Re: [Qemu-devel] Bug report - Windows XP guest failure

From: Michael Tokarev
Subject: Re: [Qemu-devel] Bug report - Windows XP guest failure
Date: Thu, 07 May 2015 12:34:00 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.6.0

07.05.2015 09:47, Michael Tokarev wrote:
> 07.05.2015 09:12, Michael Tokarev wrote:
>> 07.05.2015 04:11, G 3 wrote:
>>> Did you boot Windows XP to the desktop? I have tested Windows 95, Windows 
>>> 2000, and Windows XP. All of them fail to boot to the desktop.
>> Yes, booted to desktop and did some minimal work in there,
>> installnig one update or two.
>>> Command used:
>>> ./i386-softmmu/qemu-system-i386 -boot c -hda "Windows XP Hard Drive.img" 
>> Aha. You run without kvm, in tcg mode.  I don't usually do that,
>> lemme try...
> Ok, I can reproduce this, winXP BSODs on boot in tcg mode.
> Git bisect points to this:
> commit 23820dbfc79d1c9dce090b4c555994f2bb6a69b3
> Author: Peter Crosthwaite <address@hidden>
> Date:   Mon Mar 16 22:35:54 2015 -0700
>     exec: Respect as_translate_internal length clamp
>     address_space_translate_internal will clamp the *plen length argument
>     based on the size of the memory region being queried. The iommu walker
>     logic in addresss_space_translate was ignoring this by discarding the
>     post fn call value of *plen. Fix by just always using *plen as the
>     length argument throughout the fn, removing the len local variable.
>     This fixes a bootloader bug when a single elf section spans multiple
>     QEMU memory regions.
>     Signed-off-by: Peter Crosthwaite <address@hidden>
>     Message-Id: <address@hidden>
>     Signed-off-by: Paolo Bonzini <address@hidden>

This winXP BSOD happens on x86_64 target too.  Reverting the
above commit from git master fixes the BSOD.



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