kvm: get_dirty_pages returned -2 (kvm-15)

kvm: get_dirty_pages returned -2 (kvm-15)

[Larry Matter]

Hi,

I installed kvm-15 on my AMD-64 box running 32bit fedora core 6.  I ran
into the modprobe issues already mentioned so I dropped back to kvm-14.

This worked then I started getting the get_dirty_pages error.  Searching
the list I saw the patch from Avi which solved the modprobe issues and I
went back to kvm-15.  But I am still getting the get_dirty_pages error;
not sure if this is related to bug 1661262 or not.

My command line is:

/usr/local/kvm/bin/qemu -m 512 -std-vga -soundhw es1370 -net
nic,macaddr=<removed>,vlan=0 -net
tap,ifname=tap0,vlan=0,script=/etc/qemu-ifup -boot c -hda
/mnt/windows/windows.img

Any help appreciated.

Thanks!
Larry Matter

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Re: kvm: get_dirty_pages returned -2 (kvm-15)

[Avi Kivity]

Larry Matter wrote:
> Hi,
>
> I installed kvm-15 on my AMD-64 box running 32bit fedora core 6.  I ran
> into the modprobe issues already mentioned so I dropped back to kvm-14.
>
> This worked then I started getting the get_dirty_pages error.  Searching
> the list I saw the patch from Avi which solved the modprobe issues and I
> went back to kvm-15.  But I am still getting the get_dirty_pages error;
> not sure if this is related to bug 1661262 or not.
>
> My command line is:
>
> /usr/local/kvm/bin/qemu -m 512 -std-vga -soundhw es1370 -net
> nic,macaddr=<removed>,vlan=0 -net
> tap,ifname=tap0,vlan=0,script=/etc/qemu-ifup -boot c -hda
> /mnt/windows/windows.img
>
>   

Can you try stracing to see if it's a kernel or userspace problem?

prefix your command line with

   strace -e trace=ioctl -e signal=none -o /tmp/kvm.trace 
/usr/local/bin/qemu...

and then post the result of

   grep ENOENT /tmp/kvm.trace

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


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Re: kvm: get_dirty_pages returned -2 (kvm-15)

[Larry Matter]

> Can you try stracing to see if it's a kernel or userspace problem?
>
> prefix your command line with
>
>    strace -e trace=ioctl -e signal=none -o /tmp/kvm.trace
> /usr/local/bin/qemu...
>
> and then post the result of
>
>    grep ENOENT /tmp/kvm.trace

I get lots of these:

ioctl(6, 0x4010ae0c, 0xbfc71af8)        = -1 ENOENT (No such file or
directory)

Thanks,
Larry


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Re: kvm: get_dirty_pages returned -2 (kvm-15)

[Avi Kivity]

Larry Matter wrote:
>> Can you try stracing to see if it's a kernel or userspace problem?
>>
>> prefix your command line with
>>
>>    strace -e trace=ioctl -e signal=none -o /tmp/kvm.trace
>> /usr/local/bin/qemu...
>>
>> and then post the result of
>>
>>    grep ENOENT /tmp/kvm.trace
>>     
>
> I get lots of these:
>
> ioctl(6, 0x4010ae0c, 0xbfc71af8)        = -1 ENOENT (No such file or
> directory)
>
>   

When you run it (without strace), do the messages stop after a while, or 
do they go on forever?


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


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Re: kvm: get_dirty_pages returned -2 (kvm-15)

[Avi Kivity]

Avi Kivity wrote:
> Larry Matter wrote:
>>> Can you try stracing to see if it's a kernel or userspace problem?
>>>
>>> prefix your command line with
>>>
>>>    strace -e trace=ioctl -e signal=none -o /tmp/kvm.trace
>>> /usr/local/bin/qemu...
>>>
>>> and then post the result of
>>>
>>>    grep ENOENT /tmp/kvm.trace
>>>     
>>
>> I get lots of these:
>>
>> ioctl(6, 0x4010ae0c, 0xbfc71af8)        = -1 ENOENT (No such file or
>> directory)
>>
>>   
>
> When you run it (without strace), do the messages stop after a while, 
> or do they go on forever?
>
>

And do they show up without -std-vga?

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


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Re: kvm: get_dirty_pages returned -2 (kvm-15)

[Larry Matter]

>> When you run it (without strace), do the messages stop after a while,
>> or do they go on forever?

It does on for as long as I let it

>
> And do they show up without -std-vga?

Nope, that seems to be the culprit.   Should that flag be supported?  I
believe this is recommeded in qemu when displaying high res (I'm doing
1280x1024).

Thanks!
Larry



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Re: kvm: get_dirty_pages returned -2 (kvm-15)

[Avi Kivity]

Larry Matter wrote:
>>> When you run it (without strace), do the messages stop after a while,
>>> or do they go on forever?
>>>       
>
> It does on for as long as I let it
>
>   
>> And do they show up without -std-vga?
>>     
>
> Nope, that seems to be the culprit.   Should that flag be supported?  I
> believe this is recommeded in qemu when displaying high res (I'm doing
> 1280x1024).
>   

It's a bug.  It also means we don't accelerate -std-vga mode (which I 
have never used myself).



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


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