Re: [Qemu-devel] current qemu git does not work with win7 guest

[Jan Kiszka]

On 2012-05-07 10:51, Michael Tokarev wrote:
> So, refreshing it all again with more correct information.
> 
> First, it appears that only 32bit version of qemu userspace is
> affected, and only when using 32bit version of guest.  So far,
> either 64bit qemu userpace or 64bit windows7 guest is enough
> for the issue to not show up.  Second, both win7 and winXP
> (32bit) are affected.  Third, current qemu-kvm/master appears
> to be unaffected too.
> 
> The problem is that on first and all subsequent guest REBOOT
> (not first boot but really REBOOT) -- after the guest rebuilt
> its HAL I guess, due to some changes in "hardware" it noticed, --
> the guest BSODs during boot with this code:
> 
>  STOP: 0x0000005C (0x000000000000010B, 0x0000000000000003,
>       0x000000000000000, 0x000000000000000)
> 
> After painful bisection between 1.0 and current git, the result
> is this:
> 
> First bad commit:
> commit 5b6fb069378e61c45c577bbec3d7ef60367f7e4c
> Author: Avi Kivity <address@hidden>
> Date:   Thu Mar 1 12:58:46 2012 +0200
> 
>     pc-bios: update kvmvapic.bin
> 
>     Signed-off-by: Avi Kivity <address@hidden>
> 
> diff --git a/pc-bios/kvmvapic.bin b/pc-bios/kvmvapic.bin
> new file mode 100755
> index 0000000..045f5c2
> Binary files /dev/null and b/pc-bios/kvmvapic.bin differ
> 
> Which, despite the name, actually INTRODUCES kvmvapic.bin,
> not merely updates it.  So apparently this introduction of
> kvmvapic.bin resulted in autoloading implemented earlier to
> starte entering the game, which appears to be this one:
> 
> commit e5ad936b0fd7dfd7fd7908be6f9f1ca88f63b96b
> Author: Jan Kiszka <address@hidden>
> Date:   Fri Feb 17 18:31:19 2012 +0100
> 
>     kvmvapic: Introduce TPR access optimization for Windows guests
> 
> And indeed, we're talking about windows guests here...
> 
> Anything I can do further to debug/fix the issue?
> 

I have a 32-bit WinXP here to test (but not a Win7-32) and will give it
a try later. What irritates me is that qemu.git has a problem here but
not latest qemu-kvm.git. Both are very similar now. Hmm, what is your
qemu.git command line again? Does it include "-machine
accel=kvm,kernel_irqchip=on" (to enable in-kernel irqchip)?

Jan

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