From: Rik van Riel <riel@redhat.com>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: xen-devel@lists.xensource.com, "Nakajima, Jun" <jun.nakajima@intel.com>
Subject: Re: x86-64 machine_to_phys vs NX bit
Date: Fri, 25 Aug 2006 11:19:21 -0400 [thread overview]
Message-ID: <44EF14F9.2090309@redhat.com> (raw)
In-Reply-To: <C114D189.15C0%Keir.Fraser@cl.cam.ac.uk>
Keir Fraser wrote:
>
>
> On 25/8/06 3:46 pm, "Nakajima, Jun" <jun.nakajima@intel.com> wrote:
>
>> I agree, and I'm wondering why we don't have the same problem on i386?
>> To me it basically does the same thing.
>
> A long is only 32 bits there, so when we pass the MFN portion the NX bit is
> conveniently truncated away!
Which means it'll do the wrong thing for machine addresses > 4GB
on PAE, or am I overlooking something?
--
What is important? What you want to be true, or what is true?
next prev parent reply other threads:[~2006-08-25 15:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-25 14:46 x86-64 machine_to_phys vs NX bit Nakajima, Jun
2006-08-25 15:10 ` Keir Fraser
2006-08-25 15:19 ` Rik van Riel [this message]
2006-08-25 15:27 ` Keir Fraser
-- strict thread matches above, loose matches on Subject: below --
2006-11-11 4:30 John Byrne
2006-11-11 9:56 ` John Byrne
2006-11-13 8:07 ` Jan Beulich
2006-11-13 8:16 ` Keir Fraser
2006-11-13 20:45 ` John Byrne
2006-11-14 1:15 ` John Byrne
2006-11-14 8:05 ` Jan Beulich
2006-11-14 8:17 ` Keir Fraser
2006-08-25 17:02 Nakajima, Jun
2006-08-25 15:56 Ian Pratt
2006-08-25 15:37 Nakajima, Jun
2006-08-24 19:25 Rik van Riel
2006-08-25 7:32 ` Keir Fraser
2006-08-25 13:11 ` Jan Beulich
2006-08-25 13:54 ` Rik van Riel
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