Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and L_PTE_NOWRITE

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From: Russell King - ARM Linux

Subject: Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and L_PTE_NOWRITE

Date: Wednesday, November 17, 2010 - 10:16 am

On Wed, Nov 17, 2010 at 05:02:37PM +0000, Catalin Marinas wrote:
quoted text> On 15 November 2010 18:30, Russell King - ARM Linux
> <linux@arm.linux.org.uk> wrote:
> > On Fri, Nov 12, 2010 at 06:00:25PM +0000, Catalin Marinas wrote:
> >> --- a/arch/arm/include/asm/pgtable-2level.h
> >> +++ b/arch/arm/include/asm/pgtable-2level.h
> >> @@ -128,6 +128,8 @@
> >>  #define L_PTE_USER           (1 << 8)
> >>  #define L_PTE_EXEC           (1 << 9)
> >>  #define L_PTE_SHARED         (1 << 10)       /* shared(v6), coherent(xsc3) */
> >> +#define L_PTE_NOEXEC         (0)
> >> +#define L_PTE_NOWRITE                (0)
> >
> > Let's not make this more complicated than it has to be.  If we need the
> > inverse of WRITE and EXEC, then that's what we should change everyone to,
> > not invent a new system to work along side the old system.
> 
> Question on the pgprot_noncached/writecombine/dmacoherent - in the
> current implementation we pass L_PTE_EXEC on the dmacoherent macro.

Erm.  Please look at the code again.
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[PATCH v2 00/20] ARM: Add support for the Large Physical A ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 01/20] ARM: LPAE: Use PMD_(SHIFT|SIZE|MASK) inst ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 02/20] ARM: LPAE: Factor out 2-level page table ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigned lo ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 04/20] ARM: LPAE: Do not assume Linux PTEs are a ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and L_P ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 06/20] ARM: LPAE: Introduce the 3-level page tab ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 07/20] ARM: LPAE: Page table maintenance for the ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level page ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 09/20] ARM: LPAE: Change setup_mm_for_reboot() t ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 10/20] ARM: LPAE: Remove the FIRST_USER_PGD_NR a ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 11/20] ARM: LPAE: Add fault handling support, Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 12/20] ARM: LPAE: Add context switching support, Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 13/20] ARM: LPAE: Add SMP support for the 3-leve ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 14/20] ARM: LPAE: use phys_addr_t instead of uns ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 15/20] ARM: LPAE: Use generic dma_addr_t type de ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 16/20] ARM: LPAE: mark memory banks with start > ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 17/20] ARM: LPAE: use phys_addr_t for physical s ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 18/20] ARM: LPAE: add support for ATAG_MEM64, Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 19/20] ARM: LPAE: define printk format for physi ..., Catalin Marinas, (Fri Nov 12, 11:00 am)

[PATCH v2 20/20] ARM: LPAE: Add the Kconfig entries, Catalin Marinas, (Fri Nov 12, 11:00 am)

Re: [PATCH v2 20/20] ARM: LPAE: Add the Kconfig entries, Sergei Shtylyov, (Sat Nov 13, 5:38 am)

Re: [PATCH v2 20/20] ARM: LPAE: Add the Kconfig entries, Catalin Marinas, (Sun Nov 14, 3:11 am)

Re: [PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level ..., Catalin Marinas, (Sun Nov 14, 3:13 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Russell King - ARM Linux, (Sun Nov 14, 6:19 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Sun Nov 14, 7:09 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Sun Nov 14, 7:13 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Russell King - ARM Linux, (Sun Nov 14, 8:14 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Mon Nov 15, 2:39 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Arnd Bergmann, (Mon Nov 15, 2:47 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Mon Nov 15, 2:51 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Russell King - ARM Linux, (Mon Nov 15, 10:36 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Mon Nov 15, 10:39 am)

Re: [PATCH v2 04/20] ARM: LPAE: Do not assume Linux PTEs a ..., Russell King - ARM Linux, (Mon Nov 15, 10:42 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Russell King - ARM Linux, (Mon Nov 15, 11:30 am)

Re: [PATCH v2 06/20] ARM: LPAE: Introduce the 3-level page ..., Russell King - ARM Linux, (Mon Nov 15, 11:34 am)

Re: [PATCH v2 04/20] ARM: LPAE: Do not assume Linux PTEs a ..., Catalin Marinas, (Mon Nov 15, 2:46 pm)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Nicolas Pitre, (Mon Nov 15, 3:07 pm)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Nicolas Pitre, (Mon Nov 15, 3:11 pm)

Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page ta ..., Russell King - ARM Linux, (Mon Nov 15, 4:31 pm)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Russell King - ARM Linux, (Mon Nov 15, 4:35 pm)

Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page ta ..., Catalin Marinas, (Tue Nov 16, 2:14 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Tue Nov 16, 2:19 am)

Re: [PATCH v2 06/20] ARM: LPAE: Introduce the 3-level page ..., Catalin Marinas, (Tue Nov 16, 2:57 am)

Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page ta ..., Russell King - ARM Linux, (Tue Nov 16, 2:59 am)

Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page ta ..., Catalin Marinas, (Tue Nov 16, 3:02 am)

Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page ta ..., Russell King - ARM Linux, (Tue Nov 16, 3:04 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Tue Nov 16, 3:07 am)

Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page ta ..., Catalin Marinas, (Tue Nov 16, 3:11 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Tue Nov 16, 8:18 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Tue Nov 16, 8:32 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Russell King - ARM Linux, (Tue Nov 16, 11:19 am)

Re: [PATCH v2 03/20] ARM: LPAE: use u32 instead of unsigne ..., Catalin Marinas, (Tue Nov 16, 12:34 pm)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Wed Nov 17, 10:02 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Russell King - ARM Linux, (Wed Nov 17, 10:16 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Wed Nov 17, 10:22 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Russell King - ARM Linux, (Wed Nov 17, 10:24 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Wed Nov 17, 10:30 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Russell King - ARM Linux, (Wed Nov 17, 10:32 am)

Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and ..., Catalin Marinas, (Wed Nov 17, 10:34 am)

Re: [PATCH v2 01/20] ARM: LPAE: Use PMD_(SHIFT|SIZE|MASK) ..., Russell King - ARM Linux, (Mon Nov 22, 5:43 am)

Re: [PATCH v2 07/20] ARM: LPAE: Page table maintenance for ..., Russell King - ARM Linux, (Mon Nov 22, 5:58 am)

Re: [PATCH v2 01/20] ARM: LPAE: Use PMD_(SHIFT|SIZE|MASK) ..., Catalin Marinas, (Mon Nov 22, 6:00 am)

Re: [PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level ..., Russell King - ARM Linux, (Mon Nov 22, 6:10 am)

Re: [PATCH v2 09/20] ARM: LPAE: Change setup_mm_for_reboot ..., Russell King - ARM Linux, (Mon Nov 22, 6:11 am)

Re: [PATCH v2 10/20] ARM: LPAE: Remove the FIRST_USER_PGD_ ..., Russell King - ARM Linux, (Mon Nov 22, 6:11 am)

Re: [PATCH v2 11/20] ARM: LPAE: Add fault handling support, Russell King - ARM Linux, (Mon Nov 22, 6:15 am)

Re: [PATCH v2 11/20] ARM: LPAE: Add fault handling support, Catalin Marinas, (Mon Nov 22, 6:19 am)

Re: [PATCH v2 01/20] ARM: LPAE: Use PMD_(SHIFT|SIZE|MASK) ..., Russell King - ARM Linux, (Mon Nov 22, 6:28 am)

Re: [PATCH v2 11/20] ARM: LPAE: Add fault handling support, Russell King - ARM Linux, (Mon Nov 22, 6:32 am)

Re: [PATCH v2 13/20] ARM: LPAE: Add SMP support for the 3- ..., Russell King - ARM Linux, (Mon Nov 22, 6:37 am)

Re: [PATCH v2 11/20] ARM: LPAE: Add fault handling support, Catalin Marinas, (Mon Nov 22, 6:38 am)

Re: [PATCH v2 19/20] ARM: LPAE: define printk format for p ..., Russell King - ARM Linux, (Mon Nov 22, 6:43 am)

Re: [PATCH v2 19/20] ARM: LPAE: define printk format for p ..., Catalin Marinas, (Mon Nov 22, 6:49 am)

Re: [PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level ..., Catalin Marinas, (Tue Nov 23, 4:38 am)

Re: [PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level ..., Russell King - ARM Linux, (Tue Nov 23, 10:33 am)

Re: [PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level ..., Catalin Marinas, (Tue Nov 23, 10:35 am)

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