Re: [Qemu-devel] windows workload: many ept_violation and mmio exits

[Alexander Graf]

On 28.08.2011, at 02:42, Avi Kivity wrote:

> On 08/26/2011 08:32 AM, ya su wrote:
>> hi,Avi:
>> 
>>     I met the same problem, tons of hpet vm_exits(vector 209, fault
>> address is in the guest vm's hpet mmio range), even I disable hpet
>> device in win7 guest vm, it still produce a larget amount of vm_exits
>> when trace-cmd ;  I add -no-hpet to start the vm, it still has HPET
>> device inside VM.
>> 
>>     Does that means the HPET device in VM does not depend on the
>> emulated hpet device in qemu-kvm? Is there any way to disable the VM
>> HPET device to prevent so many vm_exits?  Thansk.
>> 
> 
> Looks like a bug to me.

IIRC disabling the HPET device doesn't remove the entry from the DSDT, no? So 
the guest OS might still think it's there while nothing responds (read returns 
-1).


Alex