linux-kernel - Re: [tip:x86/mm] x86, mm: Set first MB as RW+NX

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Message-ID: <1276360709.4c13b80507f8b@imp.free.fr>
Date:	Sat, 12 Jun 2010 18:38:29 +0200
From:	castet.matthieu@...e.fr
To:	linux-kernel@...r.kernel.org
Cc:	Siarhei Liakh <sliakh.lkml@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [tip:x86/mm] x86, mm: Set first MB as RW+NX

hi,

> Special accommodations have been made for BIOS32/PCI BIOS services:
> according to BIOS32 specification
> (http://members.datafast.net.au/dft0802/specs/bios32.pdf), at most two
> pages per BIOS32 service should be set executable and no pages need to
> be writeable.
>From my understanding only the service directory take 2 pages.

The no info for the pci service :
- the length field could be used to find the number of page it takes.
- could we assume data ro ?

Also for easier debugging, set_2_pages_rox should print some info.


Matthieu
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