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From: Chris Wright <chrisw@redhat.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Don Dutile <ddutile@redhat.com>,
	iommu@lists.linux-foundation.org, mingo@elte.hu,
	linux-kernel@vger.kernel.org, chrisw@redhat.com,
	suresh.b.siddha@intel.com
Subject: Re: [PATCH 2/2] iommu: dmar -- reserve mmio space used by IOMMU
Date: Wed, 6 Jun 2012 16:58:27 -0700	[thread overview]
Message-ID: <20120606235827.GK12686@x200.localdomain> (raw)
In-Reply-To: <1338852196.26785.10.camel@shinybook.infradead.org>

* David Woodhouse (dwmw2@infradead.org) wrote:
> On Mon, 2012-06-04 at 19:09 -0400, Don Dutile wrote:
> > How does the kernel probe for chipsets, then registers with the chipsets
> > to find the programmed IOMMU BAR values?
> > -- I missed that class.... I only have Intel Virt Tech Directed I/O
> > Architecture spec., and the beginning of IOMMU is based on DMAR tables...
> > If you have more info/guidance, I'd appreciate it.
> 
> Hm, I thought we'd already started doing some of that in order to
> sanity-check the DMAR tables. The VTBAR registers are in PCI config
> space. The quirk_ioat_snb_local_iommu() check is already looking at
> them...

I always had the impression that things like VTBAR registers are
entirely chipset specific (and may not be there for all chipsets).
Would be great if that's incorrect.  Any idea?

thanks,
-chris

  parent reply	other threads:[~2012-06-06 23:58 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-04 21:29 [PATCH 0/2]intel-iommu: reserve IOMMU register space Donald Dutile
2012-06-04 21:29 ` [PATCH 1/2] iommu: dmar: replace printks with appropriate pr_*() Donald Dutile
2012-06-04 22:15   ` Joe Perches
2012-06-04 22:28     ` Don Dutile
2012-06-08 14:55   ` [tip:core/iommu] iommu/dmar: Replace printks with appropriate pr_* () tip-bot for Donald Dutile
2012-06-04 21:29 ` [PATCH 2/2] iommu: dmar -- reserve mmio space used by IOMMU Donald Dutile
2012-06-04 22:37   ` David Woodhouse
2012-06-04 23:09     ` Don Dutile
2012-06-04 23:23       ` David Woodhouse
2012-06-04 23:52         ` Don Dutile
2012-06-06  8:16         ` Ingo Molnar
2012-06-06  8:26           ` David Woodhouse
2012-06-06  8:29             ` Ingo Molnar
2012-06-06  8:45               ` David Woodhouse
2012-06-06 23:56                 ` Chris Wright
2012-06-06 23:58         ` Chris Wright [this message]
2012-06-08 14:56   ` [tip:core/iommu] iommu/dmar: Reserve mmio space used by the IOMMU, if the BIOS forgets to tip-bot for Donald Dutile

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