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From: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Shuah Khan <shuah.khan-VXdhtT5mjnY@public.gmane.org>
Cc: Greg KH
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	stable <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	shuahkhan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org,
	tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org
Subject: Re: [PATCH] amd_iommu: IO_PAGE_FAULTs on unity mapped regions during amd_iommu_init()
Date: Thu, 7 Feb 2013 11:49:05 +0100	[thread overview]
Message-ID: <20130207104905.GC8945@gmail.com> (raw)
In-Reply-To: <1360205603.2615.19.camel@lorien2>


* Shuah Khan <shuah.khan-VXdhtT5mjnY@public.gmane.org> wrote:

> When dma_ops are initialized the unity mappings are created. The
> init_device_table_dma() function makes sure DMA from all devices is
> blocked by default. This opens a short window in time where DMA to
> unity mapped regions is blocked by the IOMMU. Make sure this does not
> happen by initializing the device table after dma_ops.
> 
> Reference: http://www.gossamer-threads.com/lists/linux/kernel/1670769
> 
> Signed-off-by: Shuah Khan <shuah.khan-VXdhtT5mjnY@public.gmane.org>
> CC: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org 3.0
> ---
>  arch/x86/kernel/amd_iommu_init.c |   10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)

That file does not exist anymore, it died 2.5+ years ago:

  403f81d8ee53 iommu/amd: Move missing parts to drivers/iommu

Thanks,

	Ingo

  reply	other threads:[~2013-02-07 10:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-07  2:53 [PATCH] amd_iommu: IO_PAGE_FAULTs on unity mapped regions during amd_iommu_init() Shuah Khan
2013-02-07 10:49 ` Ingo Molnar [this message]
     [not found]   ` <20130207104905.GC8945-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-02-07 11:07     ` Joerg Roedel
2013-02-07 11:12       ` [v3.0 backport patch] " Ingo Molnar
2013-02-26 23:36         ` [PATCH 3.0] iommu/amd: Initialize device table after dma_ops Shuah Khan
  -- strict thread matches above, loose matches on Subject: below --
2013-02-07  2:45 [PATCH] amd_iommu: IO_PAGE_FAULTs on unity mapped regions during amd_iommu_init() Shuah Khan

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