Re: WinXP virtual crashes on 0.12.1.2 but not 0.12.1.1

[Marcelo Tosatti <mtosatti@redhat.com>]

On Wed, Jan 06, 2010 at 11:25:14AM +0000, Mark Cave-Ayland wrote:
> Avi Kivity wrote:
>
>>> I think I'm experiencing a regression with the new qemu-kvm-0.12.1.2  
>>> release compared to qemu-kvm-0.12.1.1 with a WinXP guest on Linux.
>>>
>>> I can boot my WinXP guest without a problem under qemu-kvm-0.12.1.1,  
>>> however under qemu-kvm-0.12.1.2 a couple of seconds after reaching 
>>> the login screen, the WinXP guest goes BSOD with the following error: 
>>> DRIVER_UNLOADED_WITHOUT_CANCELING_PENDING_OPERATIONS.
>>>
>>> I've confirmed by switching between the two installations several  
>>> times that the error consistently occurs with qemu-kvm-0.12.1.2 but  
>>> not qemu-kvm-0.12.1.1. Is this a known issue? This is on an x86_64  
>>> Debian Lenny host with a 2.6.32.2 kernel on Intel.
>>
>> It's not a known issue.  What's your command line?  What's your host 
>> cpu type?
>
> Hi Avi,
>
> Good news - I downloaded the userspace git repository and managed to  
> identify the offending commit between 0.12.1.1 and 0.12.1.2 using git  
> bisect:
>
>
> 4dad7ff32aa6dcf18cef0c606d8fb43ff0b939a1 is first bad commit
> commit 4dad7ff32aa6dcf18cef0c606d8fb43ff0b939a1
> Author: Avi Kivity <avi@redhat.com>
> Date:   Mon Dec 28 10:48:00 2009 +0200
>
>     Reinstate cpuid vendor override when kvm is enabled
>
>     Due to upstream qemu changes we no longer expose the host cpu vendor id
>     to the guest.  This leads to failures when the syscall/sysenter  
> instructions
>     are used in compatibility mode.
>
>     Change the default to override when kvm is enabled.
>
>     Signed-off-by: Avi Kivity <avi@redhat.com>
>     Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
>
>
> HTH,
>
> Mark.

Mark,

Thanks for tracking it down. Is there any difference with "-cpu host"
option?