From: Joerg Roedel <joro@8bytes.org>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: "ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] Device error handling / reporting / isolation
Date: Mon, 12 May 2014 16:58:06 +0200 [thread overview]
Message-ID: <20140512145806.GM12376@8bytes.org> (raw)
In-Reply-To: <1399666748.2166.68.camel@dabdike.int.hansenpartnership.com>
On Fri, May 09, 2014 at 01:19:08PM -0700, James Bottomley wrote:
> On Fri, 2014-05-09 at 20:13 +0000, Luck, Tony wrote:
> > Defending against buggy hardware is interesting from a RAS perspective.
> > You don't want a card with a stuck address line scribbling on memory
> > that you didn't want it to touch.
>
> But for a laptop or desktop kernel, how far do we want to go? In
> theory, once the iommu is turned on, it corrals the device, since access
> to non programmed addresses (those without IOTLB entries) produces a
> fault. Is there anything extra we need to do beyond turning on the
> IOMMU?
Especially for Laptops and Desktops proper fault handling is important.
Newer GPUS can use the IOMMU to directly access process address spaces
and support demand paging and CPU page-table layouts. Support for these
features in Linux is already being worked on, so handling faults in a
meaningful way is important there too.
Joerg
next prev parent reply other threads:[~2014-05-12 14:58 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-08 12:37 David Woodhouse
2014-05-08 18:03 ` Bjorn Helgaas
2014-05-08 20:00 ` Rafael J. Wysocki
2014-05-08 19:56 ` James Bottomley
2014-05-09 8:55 ` David Woodhouse
2014-05-09 11:31 ` Laurent Pinchart
2014-05-14 1:28 ` Benjamin Herrenschmidt
2014-05-09 17:48 ` Roland Dreier
2014-05-09 17:58 ` Matthew Wilcox
2014-05-09 18:08 ` Roland Dreier
2014-05-14 1:40 ` Benjamin Herrenschmidt
2014-05-09 18:05 ` Will Deacon
2014-05-12 15:03 ` Joerg Roedel
2014-05-09 19:37 ` Josh Triplett
2014-05-09 19:44 ` David Woodhouse
2014-05-09 19:53 ` Roland Dreier
2014-05-09 20:13 ` Luck, Tony
2014-05-09 20:19 ` James Bottomley
2014-05-10 1:09 ` Laurent Pinchart
2014-05-11 22:43 ` Daniel Vetter
2014-05-12 15:07 ` Joerg Roedel
2014-05-12 15:35 ` Daniel Vetter
2014-05-12 16:16 ` Andy Lutomirski
2014-05-12 16:28 ` Joerg Roedel
2014-05-12 16:59 ` Laurent Pinchart
2014-05-12 17:15 ` Joerg Roedel
2014-05-12 17:11 ` Daniel Vetter
2014-05-12 17:40 ` Joerg Roedel
2014-05-13 10:06 ` Daniel Vetter
2014-05-12 17:04 ` Daniel Vetter
2014-05-13 11:27 ` David Woodhouse
2014-05-13 17:25 ` Daniel Vetter
2014-05-14 1:50 ` Benjamin Herrenschmidt
2014-05-14 20:09 ` Daniel Vetter
2014-05-15 1:08 ` Benjamin Herrenschmidt
2014-05-12 16:26 ` Joerg Roedel
2014-05-12 14:58 ` Joerg Roedel [this message]
2014-05-13 14:37 ` David Woodhouse
2014-05-14 1:46 ` Benjamin Herrenschmidt
2014-05-14 1:43 ` Benjamin Herrenschmidt
2014-05-14 1:42 ` Benjamin Herrenschmidt
2014-05-14 1:24 ` Benjamin Herrenschmidt
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