Re: Setting nx bit in virtual CPU

[Avi Kivity <avi@redhat.com>]

On 04/07/2010 03:10 PM, Richard Simpson wrote:
> On 07/04/10 06:39, Avi Kivity wrote:
>    
>> On 04/07/2010 01:31 AM, Richard Simpson wrote:
>>      
>>>        
>>>> 2.6.27 should be plenty fine for nx.  Really the important bit is that
>>>> the host kernel has nx enabled.  Can you check if that is so?
>>>>
>>>>
>>>>          
>>> Umm, could you give me a clue about how to do that.  It is some time
>>> since I configured the host kernel, but I do have a /proc/config.gz.
>>> Could I check by looking in that?
>>>
>>>        
>> The attached script should verify it.
>>
>>      
> rs% ./check-nx
> Traceback (most recent call last):
>    File "./check-nx", line 17, in<module>
>      efer = msr().read(0xc0000080, 0)
>    File "./check-nx", line 8, in __init__
>      self.f = file('/dev/msr0')
> IOError: [Errno 2] No such file or directory: '/dev/msr0'
>
>    

Run as root, please.  And check first that you have a file named 
/dev/cpu/0/msr.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.