RE: [tip:x86/urgent] x86-64, init: Do not set NX bits on non-NX capable hardware

["H. Peter Anvin" <hpa@zytor.com>]

Yes... But both apply.

Yuhong Bao <yuhongbao_386@hotmail.com> wrote:

>(resending as plaintext)
>> During early init, we would incorrectly set the NX bit even if the NX
>> feature was not supported.  Instead, only set this bit if NX is
>> actually available and enabled.  We already do very early detection
>of
>> the NX bit to enable it in EFER, this simply extends this detection
>to
>> the early page table mask.
>AFAIK the only production x86-64 processor that don't support NX that I
>know of is the original Nocona D0 stepping.
>Must more common are the problem of BIOSes disabling the NX feature.
>
>
>Yuhong Bao 		 	   		  

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