From: Chris Wright <chrisw@sous-sol.org>
To: Chris Wright <chrisw@sous-sol.org>
Cc: David Woodhouse <dwmw2@infradead.org>,
linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] intel-iommu: Default to non-coherent for domains unattached to iommus
Date: Fri, 11 Nov 2011 16:47:36 -0800 [thread overview]
Message-ID: <20111112004736.GQ14486@sequoia.sous-sol.org> (raw)
In-Reply-To: <20111112004513.GP14486@sequoia.sous-sol.org>
* Chris Wright (chrisw@sous-sol.org) wrote:
> * David Woodhouse (dwmw2@infradead.org) wrote:
> > So if you were to ditch the whole idea of a per-domain runtime update,
> > and instead calculate a global value for 'iommu_coherency' at boot time,
> > by iterating over for_each_active_iommu()¹, I think that would be a
> > better way to deal with the issue. And you *could* really call that a
> > 'fix'.
> >
> > Make sense?
>
> Ideally, yes. Not sure we can practically do it though. Would have to
> be sure we force incoherent access mode for the busted hw.
Forgot to mention, the simple patch may be the better choice for -stable
(assuming the page table mapping issue...isn't).
next prev parent reply other threads:[~2011-11-12 0:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-11 22:49 Alex Williamson
2011-11-12 0:17 ` Chris Wright
2011-11-12 0:37 ` David Woodhouse
2011-11-12 0:45 ` Chris Wright
2011-11-12 0:47 ` Chris Wright [this message]
2011-11-12 0:51 ` David Woodhouse
2011-11-12 0:58 ` Chris Wright
2011-11-12 1:03 ` David Woodhouse
2011-11-12 0:46 ` Roland Dreier
2011-11-12 0:51 ` Chris Wright
2011-11-12 0:55 ` David Woodhouse
2011-11-12 1:08 ` Chris Wright
2011-11-12 1:20 ` David Woodhouse
2011-11-15 7:12 ` cody
2011-11-15 4:54 ` Chris Wright
2011-11-15 5:55 ` Kai Huang
2011-11-12 1:30 ` Roland Dreier
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