From: Scott Wood <scottwood@freescale.com>
To: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
Rex Feany <RFeany@mrv.com>
Subject: Re: [PATCH 0/8] 8xx: Misc fixes for buggy insn
Date: Tue, 10 Nov 2009 10:55:28 -0600 [thread overview]
Message-ID: <4AF99B00.6080504@freescale.com> (raw)
In-Reply-To: <4AF99695.800@freescale.com>
Scott Wood wrote:
> Joakim Tjernlund wrote:
>> Why does not pinning interact well with CPU15? If pinned, you never get
>> a TLB miss for kernel text so that should mitigate the CPU15 problem.
>
> The nature of the workaround for CPU15 is that we can't keep it pinned
> -- we have to take an ITLB miss on every page boundary crossing. If you
> try to pin, it'll just be invalidated by the workaround.
Except that the invalidation only happens when you take an ITLB miss on
an adjacent page, which means we'd likely never get CPU15 protection for
kernel code if pinning is enabled. :-(
-Scott
next prev parent reply other threads:[~2009-11-11 7:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-04 13:38 [PATCH 0/8] 8xx: Misc fixes for buggy insn Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 1/8] 8xx: invalidate non present TLBs Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 2/8] 8xx: Update TLB asm so it behaves as linux mm expects Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 3/8] 8xx: Tag DAR with 0x00f0 to catch buggy instructions Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 4/8] 8xx: Fixup DAR from buggy dcbX instructions Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 5/8] 8xx: Add missing Guarded setting in DTLB Error Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 6/8] 8xx: Restore _PAGE_WRITETHRU Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 7/8] 8xx: start using dcbX instructions in various copy routines Joakim Tjernlund
2009-11-04 13:38 ` [PATCH 8/8] 8xx: Remove DIRTY pte handling in DTLB Error Joakim Tjernlund
2009-11-06 0:33 ` [PATCH 0/8] 8xx: Misc fixes for buggy insn Scott Wood
2009-11-06 8:01 ` Joakim Tjernlund
2009-11-06 9:29 ` Joakim Tjernlund
[not found] ` <20091109215321.GA4351@loki.buserror.net>
2009-11-09 23:00 ` Scott Wood
2009-11-10 8:27 ` Joakim Tjernlund
2009-11-10 16:36 ` Scott Wood
2009-11-10 16:55 ` Scott Wood [this message]
2009-11-10 19:08 ` Joakim Tjernlund
[not found] ` <4AF9CC99.1030500@freescale.com>
2009-11-10 21:25 ` Joakim Tjernlund
[not found] ` <4AF9DCE0.4030805@freescale.com>
2009-11-10 21:47 ` Joakim Tjernlund
2009-11-10 22:02 ` Scott Wood
2009-11-10 23:15 ` Joakim Tjernlund
2009-11-10 23:21 ` Scott Wood
2009-11-11 0:06 ` Joakim Tjernlund
2009-11-11 15:26 ` Scott Wood
2009-11-12 9:10 ` Joakim Tjernlund
2009-11-12 19:45 ` Scott Wood
2009-11-12 21:14 ` Joakim Tjernlund
2009-11-12 21:57 ` Scott Wood
2009-11-12 23:29 ` Joakim Tjernlund
2009-11-13 19:25 ` Scott Wood
2009-11-14 14:11 ` Joakim Tjernlund
2009-11-10 19:54 ` Joakim Tjernlund
[not found] ` <4AF9C647.50600@freescale.com>
2009-11-10 21:05 ` Joakim Tjernlund
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