kvm -kernel option (x86_64)

kvm -kernel option (x86_64)

[Alexander Graf]

Hi,

I just tried to run a kernel directly using the -kernel option on VMX.  
This worked with the kvm modules in the vanilla 2.6.24 kernel but  
breaks on the recent git. I have not tried any version in between.
This really looks like the x86 emulator is broken.

Is this a known issue? Are there any (easy) means to debug the emulator?

Thanks,

Alexander Graf

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Re: kvm -kernel option (x86_64)

[Avi Kivity]

Alexander Graf wrote:
> Hi,
>
> I just tried to run a kernel directly using the -kernel option on VMX.  
> This worked with the kvm modules in the vanilla 2.6.24 kernel but  
> breaks on the recent git. I have not tried any version in between.
> This really looks like the x86 emulator is broken.
>
>   

May also be userspace guest memory, which changes how memory is allocated.

> Is this a known issue? 

No, though -kernel is very useful on occasion.

> Are there any (easy) means to debug the emulator?
>
>   

Bisect.


-- 
error compiling committee.c: too many arguments to function


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Re: kvm -kernel option (x86_64)

[Anthony Liguori]

Avi Kivity wrote:
> Alexander Graf wrote:
>   
>> Hi,
>>
>> I just tried to run a kernel directly using the -kernel option on VMX.  
>> This worked with the kvm modules in the vanilla 2.6.24 kernel but  
>> breaks on the recent git. I have not tried any version in between.
>> This really looks like the x86 emulator is broken.
>>
>>   
>>     
>
> May also be userspace guest memory, which changes how memory is allocated.
>
>   

It looks like it broke somewhere between 
0fcf487831bbc48e720210c164ca9747b6e99af7 and kvm-52.  It's definitely a 
qemu issue as I'm currently using that git rev of kvm-userspace and 
kvm-52 kernel modules and it works just fine.

Regards,

Anthony Liguori

>> Is this a known issue? 
>>     
>
> No, though -kernel is very useful on occasion.
>
>   
>> Are there any (easy) means to debug the emulator?
>>
>>   
>>     
>
> Bisect.
>
>
>   


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Re: kvm -kernel option (x86_64)

[Izik Eidus]

On Wed, 2007-11-14 at 10:10 -0600, Anthony Liguori wrote:
> Avi Kivity wrote:
> > Alexander Graf wrote:
> >   
> >> Hi,
> >>
> >> I just tried to run a kernel directly using the -kernel option on VMX.  
> >> This worked with the kvm modules in the vanilla 2.6.24 kernel but  
> >> breaks on the recent git. I have not tried any version in between.
> >> This really looks like the x86 emulator is broken.
> >>
> >>   
> >>     
> >
> > May also be userspace guest memory, which changes how memory is allocated.
> >
> >   
> 
> It looks like it broke somewhere between 
> 0fcf487831bbc48e720210c164ca9747b6e99af7 and kvm-52.  It's definitely a 
> qemu issue as I'm currently using that git rev of kvm-userspace and 
> kvm-52 kernel modules and it works just fine.
> 

it is probably the new mappings that we did in qemu,
i will check this.


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