Re: [PATCH 2/3] add SPTE_HOST_WRITEABLE flag to the shadow ptes

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On Mon, Sep 14, 2009 at 07:51:16PM +0300, Izik Eidus wrote:
> Marcelo Tosatti wrote:
>> Why can't you use the writable bit in the spte? So that you can only  
>> sync a writeable spte if it was writeable before, in sync_page?
>>   
>
> I could, but there we will add overhead for read only gptes that become  
> writable in the guest...
> If you prefer to fault on the syncing of the guest gpte readonly to gpte  
> writeable I can change it...
>
> What you prefer?

Oh yes, better keep the bit then.

>> Is there any other need for the extra bit?
>>   
>
> No
>
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