From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 11/14] ARM: v6k: use CPU domain feature if we include support for arch < ARMv6K
Date: Fri, 28 Jan 2011 09:59:53 +0000 [thread overview]
Message-ID: <20110128095953.GA13005@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1296207966.1799.10.camel@e102109-lin.cambridge.arm.com>
On Fri, Jan 28, 2011 at 09:46:06AM +0000, Catalin Marinas wrote:
> Does this mean that we could still configure a kernel to run on CPU_V6
> with domains disabled? The vectors page becomes read-only and setting
> the TLS would fail.
Yes it will, so that's not acceptable either.
> My point is that we may want SWP_EMULATE disabled (or depending on !
> CPU_USE_DOMAINS). With domains enabled every read-only user page is
> writeable by the kernel. This has the side-effect that SWP emulation
> using LDREX/STREX breaks COW.
Yes, and maybe we should instead just enable the SWP instruction by default
on ARMv7, and if SWP emulation is built, disable it at that point.
> We could change early_trap_init() to always use the vectors_page rather
> than the high mapping and determine at run-time (patch the code) whether
> set_pte_ext sets R/W kernel permissions for RO user pages.
With aliasing caches that becomes much more difficult.
WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 11/14] ARM: v6k: use CPU domain feature if we include support for arch < ARMv6K
Date: Fri, 28 Jan 2011 09:59:53 +0000 [thread overview]
Message-ID: <20110128095953.GA13005@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1296207966.1799.10.camel@e102109-lin.cambridge.arm.com>
On Fri, Jan 28, 2011 at 09:46:06AM +0000, Catalin Marinas wrote:
> Does this mean that we could still configure a kernel to run on CPU_V6
> with domains disabled? The vectors page becomes read-only and setting
> the TLS would fail.
Yes it will, so that's not acceptable either.
> My point is that we may want SWP_EMULATE disabled (or depending on !
> CPU_USE_DOMAINS). With domains enabled every read-only user page is
> writeable by the kernel. This has the side-effect that SWP emulation
> using LDREX/STREX breaks COW.
Yes, and maybe we should instead just enable the SWP instruction by default
on ARMv7, and if SWP emulation is built, disable it at that point.
> We could change early_trap_init() to always use the vectors_page rather
> than the high mapping and determine at run-time (patch the code) whether
> set_pte_ext sets R/W kernel permissions for RO user pages.
With aliasing caches that becomes much more difficult.
next prev parent reply other threads:[~2011-01-28 10:00 UTC|newest]
Thread overview: 254+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-17 19:20 [PATCH 00/14] Fix issues with ARMv6+v6k+v7 kernels Russell King - ARM Linux
2011-01-17 19:20 ` Russell King - ARM Linux
2011-01-17 19:21 ` [PATCH 01/14] ARM: bitops: ensure set/clear/change bitops take a word-aligned pointer Russell King - ARM Linux
2011-01-17 19:21 ` Russell King - ARM Linux
2011-01-18 6:00 ` Nicolas Pitre
2011-01-18 6:00 ` Nicolas Pitre
2011-01-18 14:30 ` Russell King - ARM Linux
2011-01-18 14:30 ` Russell King - ARM Linux
2011-01-18 18:20 ` Nicolas Pitre
2011-01-18 18:20 ` Nicolas Pitre
2011-01-18 15:11 ` Catalin Marinas
2011-01-18 15:11 ` Catalin Marinas
2011-01-25 19:50 ` Tony Lindgren
2011-01-25 19:50 ` Tony Lindgren
2011-01-17 19:21 ` [PATCH 02/14] ARM: bitops: switch set/clear/change bitops to use ldrex/strex Russell King - ARM Linux
2011-01-17 19:21 ` Russell King - ARM Linux
2011-01-18 5:42 ` Nicolas Pitre
2011-01-18 5:42 ` Nicolas Pitre
2011-01-23 0:16 ` Russell King - ARM Linux
2011-01-23 0:16 ` Russell King - ARM Linux
2011-01-23 4:44 ` Nicolas Pitre
2011-01-23 4:44 ` Nicolas Pitre
2011-01-23 9:35 ` Russell King - ARM Linux
2011-01-23 9:35 ` Russell King - ARM Linux
2011-01-24 8:38 ` Poddar, Sourav
2011-01-24 8:38 ` Poddar, Sourav
2011-01-24 8:57 ` Poddar, Sourav
2011-01-24 8:57 ` Poddar, Sourav
2011-01-24 10:28 ` Russell King - ARM Linux
2011-01-24 10:28 ` Russell King - ARM Linux
2011-01-24 13:47 ` Poddar, Sourav
2011-01-24 13:47 ` Poddar, Sourav
2011-01-24 14:11 ` Russell King - ARM Linux
2011-01-24 14:11 ` Russell King - ARM Linux
2011-01-24 14:54 ` Poddar, Sourav
2011-01-24 14:54 ` Poddar, Sourav
2011-01-24 15:00 ` Russell King - ARM Linux
2011-01-24 15:00 ` Russell King - ARM Linux
2011-01-25 13:57 ` Will Deacon
2011-01-25 13:57 ` Will Deacon
2011-01-25 14:11 ` Russell King - ARM Linux
2011-01-25 14:11 ` Russell King - ARM Linux
2011-01-25 14:19 ` Will Deacon
2011-01-25 14:19 ` Will Deacon
[not found] ` <000601cbbc97$cc6955d0$653c0170$%deacon@arm.com>
2011-01-25 21:38 ` Nicolas Pitre
2011-01-25 21:38 ` Nicolas Pitre
2011-01-25 19:51 ` Tony Lindgren
2011-01-25 19:51 ` Tony Lindgren
2011-01-17 19:22 ` [PATCH 03/14] ARM: v6k: remove CPU_32v6K dependencies in asm/spinlock.h Russell King - ARM Linux
2011-01-17 19:22 ` Russell King - ARM Linux
2011-01-17 23:13 ` Tony Lindgren
2011-01-17 23:13 ` Tony Lindgren
2011-01-25 16:43 ` Dave Martin
2011-01-25 16:43 ` Dave Martin
2011-01-25 16:59 ` Russell King - ARM Linux
2011-01-25 16:59 ` Russell King - ARM Linux
2011-01-25 17:33 ` Dave Martin
2011-01-25 17:33 ` Dave Martin
2011-01-25 17:46 ` Russell King - ARM Linux
2011-01-25 17:46 ` Russell King - ARM Linux
2011-01-25 21:21 ` Nicolas Pitre
2011-01-25 21:21 ` Nicolas Pitre
2011-01-26 11:11 ` Dave Martin
2011-01-26 11:11 ` Dave Martin
2011-01-26 12:44 ` Russell King - ARM Linux
2011-01-26 12:44 ` Russell King - ARM Linux
2011-01-26 17:25 ` [PATCH] ARM: Avoid discarding sections that might have SMP_ON_UP fixups Dave P. Martin
2011-01-26 17:25 ` Dave P. Martin
2011-01-26 21:31 ` Nicolas Pitre
2011-01-26 21:31 ` Nicolas Pitre
2011-01-27 14:37 ` [PATCH v2] ARM: Avoid discarding sections that might have SMP_ON_UP fixups " Dave Martin
2011-01-27 14:37 ` Dave Martin
2011-01-27 16:46 ` Russell King - ARM Linux
2011-01-27 16:46 ` Russell King - ARM Linux
2011-02-09 14:22 ` [PATCH] ARM: Avoid discarding sections that might have " Russell King - ARM Linux
2011-02-09 14:22 ` Russell King - ARM Linux
2011-02-10 12:56 ` Russell King - ARM Linux
2011-02-10 12:56 ` Russell King - ARM Linux
2011-02-10 14:11 ` Dave Martin
2011-02-10 14:11 ` Dave Martin
2011-02-10 14:13 ` Dave Martin
2011-02-10 14:13 ` Dave Martin
2011-02-10 14:46 ` Russell King - ARM Linux
2011-02-10 14:46 ` Russell King - ARM Linux
2011-02-10 18:29 ` Dave Martin
2011-02-10 18:29 ` Dave Martin
2011-02-10 19:11 ` Russell King - ARM Linux
2011-02-10 19:11 ` Russell King - ARM Linux
2011-02-11 9:33 ` Dave Martin
2011-02-11 9:33 ` Dave Martin
2011-02-11 10:13 ` Russell King - ARM Linux
2011-02-11 10:13 ` Russell King - ARM Linux
2011-02-11 10:52 ` Dave Martin
2011-02-11 10:52 ` Dave Martin
2011-02-11 16:05 ` Russell King - ARM Linux
2011-02-11 16:05 ` Russell King - ARM Linux
2011-02-11 16:17 ` Dave Martin
2011-02-11 16:17 ` Dave Martin
2011-02-11 16:32 ` Russell King - ARM Linux
2011-02-11 16:32 ` Russell King - ARM Linux
2011-02-16 16:35 ` Dave Martin
2011-02-16 16:35 ` Dave Martin
2011-02-18 17:52 ` Dave Martin
2011-02-18 17:52 ` Dave Martin
2011-01-26 15:42 ` [PATCH 03/14] ARM: v6k: remove CPU_32v6K dependencies in asm/spinlock.h Nicolas Pitre
2011-01-26 15:42 ` Nicolas Pitre
2011-01-26 15:52 ` Russell King - ARM Linux
2011-01-26 15:52 ` Russell King - ARM Linux
2011-01-26 16:59 ` Dave Martin
2011-01-26 16:59 ` Dave Martin
2011-01-26 21:06 ` Nicolas Pitre
2011-01-26 21:06 ` Nicolas Pitre
2011-01-27 11:44 ` Dave P. Martin
2011-01-27 11:44 ` Dave P. Martin
2011-01-17 19:22 ` [PATCH 04/14] ARM: v6k: introduce CPU_V6K option Russell King - ARM Linux
2011-01-17 19:22 ` Russell King - ARM Linux
2011-01-17 23:14 ` Tony Lindgren
2011-01-17 23:14 ` Tony Lindgren
2011-01-18 10:36 ` Will Deacon
2011-01-18 10:36 ` Will Deacon
2011-01-18 11:09 ` Russell King - ARM Linux
2011-01-18 11:09 ` Russell King - ARM Linux
2011-01-18 13:35 ` Russell King - ARM Linux
2011-01-18 13:35 ` Russell King - ARM Linux
2011-01-18 15:22 ` Will Deacon
2011-01-18 15:22 ` Will Deacon
2011-01-17 19:22 ` [PATCH 05/14] ARM: v6k: Realview EB 11MPCore and PB11MPCore use V6K architecture CPUs Russell King - ARM Linux
2011-01-17 19:22 ` Russell King - ARM Linux
2011-01-17 19:23 ` [PATCH 06/14] ARM: v6k: Dove platforms " Russell King - ARM Linux
2011-01-17 19:23 ` Russell King - ARM Linux
2011-01-17 23:39 ` Nicolas Pitre
2011-01-17 23:39 ` Nicolas Pitre
2011-01-17 19:23 ` [PATCH 07/14] ARM: v6k: select clear exclusive code seqences according to V6 variants Russell King - ARM Linux
2011-01-17 19:23 ` Russell King - ARM Linux
2011-01-17 23:15 ` Tony Lindgren
2011-01-17 23:15 ` Tony Lindgren
2011-01-17 19:23 ` [PATCH 08/14] ARM: v6k: select cmpxchg code sequences " Russell King - ARM Linux
2011-01-17 19:23 ` Russell King - ARM Linux
2011-01-17 23:18 ` Tony Lindgren
2011-01-17 23:18 ` Tony Lindgren
2011-01-17 19:24 ` [PATCH 09/14] ARM: v6k: select generic atomic64 code " Russell King - ARM Linux
2011-01-17 19:24 ` Russell King - ARM Linux
2011-01-17 23:21 ` Tony Lindgren
2011-01-17 23:21 ` Tony Lindgren
2011-01-18 10:24 ` Will Deacon
2011-01-18 10:24 ` Will Deacon
2011-01-17 19:24 ` [PATCH 10/14] ARM: v6k: select TLS register " Russell King - ARM Linux
2011-01-17 19:24 ` Russell King - ARM Linux
2011-01-17 22:23 ` Nicolas Pitre
2011-01-17 22:23 ` Nicolas Pitre
2011-01-17 22:36 ` Russell King - ARM Linux
2011-01-17 22:36 ` Russell King - ARM Linux
2011-01-17 22:52 ` Russell King - ARM Linux
2011-01-17 22:52 ` Russell King - ARM Linux
2011-01-18 4:27 ` Nicolas Pitre
2011-01-18 4:27 ` Nicolas Pitre
2011-01-18 4:25 ` Nicolas Pitre
2011-01-18 4:25 ` Nicolas Pitre
2011-01-17 23:21 ` Tony Lindgren
2011-01-17 23:21 ` Tony Lindgren
2011-01-17 19:24 ` [PATCH 11/14] ARM: v6k: use CPU domain feature if we include support for arch < ARMv6K Russell King - ARM Linux
2011-01-17 19:24 ` Russell King - ARM Linux
2011-01-17 22:03 ` Nicolas Pitre
2011-01-17 22:03 ` Nicolas Pitre
2011-01-17 23:23 ` Tony Lindgren
2011-01-17 23:23 ` Tony Lindgren
2011-01-27 18:14 ` Catalin Marinas
2011-01-27 18:14 ` Catalin Marinas
2011-01-27 18:59 ` Russell King - ARM Linux
2011-01-27 18:59 ` Russell King - ARM Linux
2011-01-28 9:46 ` Catalin Marinas
2011-01-28 9:46 ` Catalin Marinas
2011-01-28 9:59 ` Russell King - ARM Linux [this message]
2011-01-28 9:59 ` Russell King - ARM Linux
2011-01-28 10:46 ` Catalin Marinas
2011-01-28 10:46 ` Catalin Marinas
2011-01-28 11:06 ` Russell King - ARM Linux
2011-01-28 11:06 ` Russell King - ARM Linux
2011-01-28 12:25 ` Catalin Marinas
2011-01-28 12:25 ` Catalin Marinas
2011-01-28 13:05 ` Russell King - ARM Linux
2011-01-28 13:05 ` Russell King - ARM Linux
2011-01-28 13:10 ` Catalin Marinas
2011-01-28 13:10 ` Catalin Marinas
2011-01-28 13:22 ` Russell King - ARM Linux
2011-01-28 13:22 ` Russell King - ARM Linux
2011-01-28 13:21 ` Russell King - ARM Linux
2011-01-28 13:21 ` Russell King - ARM Linux
2011-01-28 15:11 ` Catalin Marinas
2011-01-28 15:11 ` Catalin Marinas
2011-01-28 16:49 ` Tony Lindgren
2011-01-28 16:49 ` Tony Lindgren
2011-01-17 19:25 ` [PATCH 12/14] ARM: v6k: do not disable CPU_32v6K based on platform selection Russell King - ARM Linux
2011-01-17 19:25 ` Russell King - ARM Linux
2011-01-17 23:24 ` Tony Lindgren
2011-01-17 23:24 ` Tony Lindgren
2011-01-17 19:25 ` [PATCH 13/14] ARM: v6k: allow swp emulation again when ARMv7 is enabled Russell King - ARM Linux
2011-01-17 19:25 ` Russell King - ARM Linux
2011-01-17 23:24 ` Tony Lindgren
2011-01-17 23:24 ` Tony Lindgren
2011-01-17 19:25 ` [PATCH 14/14] ARM: v6k: only allow SMP if we have v6k or v7 CPU Russell King - ARM Linux
2011-01-17 19:25 ` Russell King - ARM Linux
2011-01-17 23:25 ` Tony Lindgren
2011-01-17 23:25 ` Tony Lindgren
2011-01-17 22:21 ` [PATCH 00/14] Fix issues with ARMv6+v6k+v7 kernels Tony Lindgren
2011-01-17 22:21 ` Tony Lindgren
2011-01-18 14:30 ` Kirill A. Shutemov
2011-01-18 14:30 ` Kirill A. Shutemov
2011-01-18 14:40 ` Russell King - ARM Linux
2011-01-18 14:40 ` Russell King - ARM Linux
2011-01-18 14:44 ` Kirill A. Shutemov
2011-01-18 14:44 ` Kirill A. Shutemov
2011-01-18 15:01 ` Russell King - ARM Linux
2011-01-18 15:01 ` Russell King - ARM Linux
2011-02-08 16:36 ` Santosh Shilimkar
2011-02-08 16:36 ` Santosh Shilimkar
2011-02-08 16:47 ` Russell King - ARM Linux
2011-02-08 16:47 ` Russell King - ARM Linux
2011-02-08 16:58 ` Santosh Shilimkar
2011-02-08 16:58 ` Santosh Shilimkar
2011-02-08 20:43 ` Nicolas Pitre
2011-02-08 20:43 ` Nicolas Pitre
2011-02-09 0:35 ` Tony Lindgren
2011-02-09 0:35 ` Tony Lindgren
2011-02-09 6:04 ` Santosh Shilimkar
2011-02-09 6:04 ` Santosh Shilimkar
2011-02-09 9:48 ` Dave Martin
2011-02-09 9:48 ` Dave Martin
2011-02-09 10:00 ` Santosh Shilimkar
2011-02-09 10:00 ` Santosh Shilimkar
2011-02-09 16:24 ` Tony Lindgren
2011-02-09 16:24 ` Tony Lindgren
2011-02-09 16:27 ` Santosh Shilimkar
2011-02-09 16:27 ` Santosh Shilimkar
2011-02-09 16:32 ` Russell King - ARM Linux
2011-02-09 16:32 ` Russell King - ARM Linux
2011-02-09 16:44 ` Russell King - ARM Linux
2011-02-09 16:44 ` Russell King - ARM Linux
2011-02-09 16:45 ` Nicolas Pitre
2011-02-09 16:45 ` Nicolas Pitre
2011-02-09 17:48 ` Tony Lindgren
2011-02-09 17:48 ` Tony Lindgren
2011-02-09 10:01 ` Catalin Marinas
2011-02-09 10:01 ` Catalin Marinas
2011-02-10 13:04 ` Russell King - ARM Linux
2011-02-10 13:04 ` Russell King - ARM Linux
2011-02-10 13:12 ` Catalin Marinas
2011-02-10 13:12 ` Catalin Marinas
2011-02-10 13:16 ` Russell King - ARM Linux
2011-02-10 13:16 ` Russell King - ARM Linux
2011-02-11 20:45 ` Nicolas Pitre
2011-02-11 20:45 ` Nicolas Pitre
2011-02-11 21:07 ` Russell King - ARM Linux
2011-02-11 21:07 ` Russell King - ARM Linux
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