kvm unhandled exit 4400

kvm unhandled exit 4400

[Khaled El Mously]

There seems to be a problem kvm-booting a 32-bit (Fedora) machine on a 32-bit Intel Q9450 (Ubuntu) machine.

The error displayed is:

kvm: unhandled exit 4400
kvm_run returned -22

I've checked google, the kvm website, forums, FAQs and IRC channel.

Anyone know what causes this?

Re: kvm unhandled exit 4400

[haishan]

Khaled El Mously wrote:
> There seems to be a problem kvm-booting a 32-bit (Fedora) machine on a 32-bit Intel Q9450 (Ubuntu) machine.
>
> The error displayed is:
>
> kvm: unhandled exit 4400
> kvm_run returned -22
>
> I've checked google, the kvm website, forums, FAQs and IRC channel.
>
> Anyone know what causes this?
>   

It seemed the “virtualize APIC accesses” VM-execution control was
set to 1.

What's the version of host kernel and KVM?

Regards
Shan Hai

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>   

Re: kvm unhandled exit 4400

[haishan]

Khaled El Mously wrote:
> There seems to be a problem kvm-booting a 32-bit (Fedora) machine on a 32-bit Intel Q9450 (Ubuntu) machine.
>
> The error displayed is:
>
> kvm: unhandled exit 4400
> kvm_run returned -22
>
> I've checked google, the kvm website, forums, FAQs and IRC channel.
>
> Anyone know what causes this?
>   

Your version of host kernel kvm had not implemented the
APIC-ACCESS VM EXITS emulation, update the kernel
should solve the problem.


Regards
Shan Hai

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> the body of a message to majordomo@vger.kernel.org
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>   

Re: kvm unhandled exit 4400

[Khaled El Mously]

The host kernel is on Ubuntu: 2.6.32-25-generic

The guest kernel is 2.6.34-something.

I have figured out what the problem is. When I first attempted to run kvm, it said access to /dev/kvm was denied. So I did "chmod o+rw /dev/kvm" and reloaded. It stopped complaining about permissions, but apparently it won't work unless you have the +x as well (i.e. need to do "chmod o+rwx /dev/kvm" ). Perhaps that should be documented somewhere. Or maybe kvm should specifically check for that and complain early.

Thanks for your input haishan.


On Wed, Nov 03, 2010 at 05:32:24PM +0800, haishan wrote:
> Khaled El Mously wrote:
> >There seems to be a problem kvm-booting a 32-bit (Fedora) machine on a 32-bit Intel Q9450 (Ubuntu) machine.
> >
> >The error displayed is:
> >
> >kvm: unhandled exit 4400
> >kvm_run returned -22
> >
> >I've checked google, the kvm website, forums, FAQs and IRC channel.
> >
> >Anyone know what causes this?
> 
> Your version of host kernel kvm had not implemented the
> APIC-ACCESS VM EXITS emulation, update the kernel
> should solve the problem.
> 
> 
> Regards
> Shan Hai
> 
> >--
> >To unsubscribe from this list: send the line "unsubscribe kvm" in
> >the body of a message to majordomo@vger.kernel.org
> >More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: kvm unhandled exit 4400

[Michael Tokarev]

03.11.2010 22:44, Khaled El Mously wrote:
> The host kernel is on Ubuntu: 2.6.32-25-generic
> 
> The guest kernel is 2.6.34-something.
> 
> I have figured out what the problem is. When I first attempted to run kvm, it said access to /dev/kvm was denied. So I did "chmod o+rw /dev/kvm" and reloaded. It stopped complaining about permissions, but apparently it won't work unless you have the +x as well (i.e. need to do "chmod o+rwx /dev/kvm" ). Perhaps that should be documented somewhere. Or maybe kvm should specifically check for that and complain early.

Um.  Please excuse me but this is a complete bullshit.

qemu opens /dev/kvm in O_RDWR mode.  It does not
execute that file, execute bit is not needed.

/mjt

Re: kvm unhandled exit 4400

[Michael Tokarev]

[Replying to my own email]
04.11.2010 00:16, Michael Tokarev wrote:
> 03.11.2010 22:44, Khaled El Mously wrote:
>> The host kernel is on Ubuntu: 2.6.32-25-generic
>>
>> The guest kernel is 2.6.34-something.
>>
>> I have figured out what the problem is. When I first attempted to run kvm, it said access to /dev/kvm was denied. So I did "chmod o+rw /dev/kvm" and reloaded. It stopped complaining about permissions, but apparently it won't work unless you have the +x as well (i.e. need to do "chmod o+rwx /dev/kvm" ). Perhaps that should be documented somewhere. Or maybe kvm should specifically check for that and complain early.
> 
> Um.  Please excuse me but this is a complete bullshit.

As others pointed out, this is too harsh.  It wasn't
intentional to be extra harsh here, it was just me
not realizing how harsh such a statement is, as
English is not my native language and I dont use it
much.  Far more appropriate word for this context
is "nonsense".  I apologize for using inappropriate
words.

> qemu opens /dev/kvm in O_RDWR mode.  It does not
> execute that file, execute bit is not needed.

/mjt

Re: kvm unhandled exit 4400

[Khaled El Mously]

On Sat, Nov 06, 2010 at 01:32:20AM +0300, Michael Tokarev wrote:
> [Replying to my own email]
> 04.11.2010 00:16, Michael Tokarev wrote:
> > 03.11.2010 22:44, Khaled El Mously wrote:
> >> The host kernel is on Ubuntu: 2.6.32-25-generic
> >>
> >> The guest kernel is 2.6.34-something.
> >>
> >> I have figured out what the problem is. When I first attempted to run kvm, it said access to /dev/kvm was denied. So I did "chmod o+rw /dev/kvm" and reloaded. It stopped complaining about permissions, but apparently it won't work unless you have the +x as well (i.e. need to do "chmod o+rwx /dev/kvm" ). Perhaps that should be documented somewhere. Or maybe kvm should specifically check for that and complain early.
> > 
> > Um.  Please excuse me but this is a complete bullshit.
> 
> As others pointed out, this is too harsh.  It wasn't
> intentional to be extra harsh here, it was just me
> not realizing how harsh such a statement is, as
> English is not my native language and I dont use it
> much.  Far more appropriate word for this context
> is "nonsense".  I apologize for using inappropriate
> words.
> 
> > qemu opens /dev/kvm in O_RDWR mode.  It does not
> > execute that file, execute bit is not needed.
> 
> /mjt

Don't worry about it - it WAS complete bullshit. I later got the error again even with /dev/kdm at +rwx.

Re: kvm unhandled exit 4400

[Avi Kivity]

On 11/05/2010 06:32 PM, Michael Tokarev wrote:
> >
> >  Um.  Please excuse me but this is a complete bullshit.
>
> As others pointed out, this is too harsh.  It wasn't
> intentional to be extra harsh here, it was just me
> not realizing how harsh such a statement is, as
> English is not my native language and I dont use it
> much.  Far more appropriate word for this context
> is "nonsense".  I apologize for using inappropriate
> words.

May I suggest "wrong" or "incorrect"?

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