Re: [Xen-devel] Intermittent fatal page fault with XEN 4.3.1 (Centos 6.3 DOM0 with linux kernel 3.10.16.)

[<Jeff_Zimmerman@xxxxxxxxxx>]

On Nov 6, 2013, at 8:18 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx>
 wrote:

> On Wed, 2013-11-06 at 16:05 +0000, Jeff_Zimmerman@xxxxxxxxxx wrote:
>> Jan,
>> 
>> I will give your patch a try.
>> I have to recant my previous statement regarding not using nested-virt.
>> It seems some of the code that is being executed on the vm contains vmx 
>> instructions.
>> Since by virtue of running this code in an hvm subject make it nested-virt.
>> 
>> This raises a question, if this functionality is undesired can we just 
>> disable nested virt by adding
>> nestedhvm=false to the configuration file?  Should the cpuid and
>> cupid_check settings be changed as well?
> 
> I'm reasonably certain that nestedhvm=false will clear the relevant
> flags in the guest visible cpuid. I'd say it was a bug if this doesn't
> happen.
> 
> nestedhvm should be disabled by default, did you explicitly enable it?
> Removing the line altogether ought to disable it too. Please let us know
> if not.
> 
> Ian.
> 
I did not enable nestedvm and when I run xl list -l the output shows 
nestedhvm=<default>
I was not sure what the default was supposed to be. I will try setting it and 
re-run our test.
Jeff
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