RE: [Xen-devel] [patch] nx bit shouldn't get set when disabled

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

Scott Parish wrote:
> On Wed, Jun 08, 2005 at 03:47:01PM -0700, Nakajima, Jun wrote:
> 
>> Agree on that part. Should read like:
>> 
>>   pte = pte_offset_kernel(pmd, (vstart + (i*PAGE_SIZE)));
>> + pte->pte &= __supported_pte_mask;
>>   pfn = pte->pte >> PAGE_SHIFT;
> 
> I dissent. Same reason as yesterday: the above might work right now,
> but as soon as we enable NX the NX bit will end up in the pfn/mfn.
> 
> sRp

Your are correct. We always need to cut off the NX bit because that's
what HYPERVISOR_dom_mem_op expects. 

Jun
---
Intel Open Source Technology Center

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