On 18/05/2015 03:54, Josh Triplett wrote:
> On Thu, May 14, 2015 at 05:04:19PM +0200, Paolo Bonzini wrote:
>> OVMF used to place page tables in ROM, which works on real hardware, 
>> and also works on VMs except:
>>
>> - on AMD systems
>>
>> - on Intel systems, if you have EPT page tables with A/D bits on
>>
>> Why? Because on these systems, the processor treat page table accesses as 
>> writes.
> 
> That's...special.  Is there no way to work around that?  In general, it
> seems like a bug if KVM cannot faithfully simulate real hardware.

Nope.  You can use eptad=N or ept=N.  As it's a microcode issue, I think
closing as cantfix is the right thing to do.

Paolo


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