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From: Ingo Molnar <mingo@kernel.org>
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 10:29:00 +0200	[thread overview]
Message-ID: <20120606082900.GF5991@gmail.com> (raw)
In-Reply-To: <1338971183.26785.33.camel@shinybook.infradead.org>


* David Woodhouse <dwmw2@infradead.org> wrote:

> On Wed, 2012-06-06 at 10:16 +0200, Ingo Molnar wrote:
>
> > So basically the patch-set is fine as-is, we just want a 
> > sufficiently nasty sounding warning message about the BIOS 
> > bug,
> 
> No. The other change that's required is that the warning and 
> the workaround need to trigger even when IOMMU support isn't 
> built into the kernel. This BIOS bug can bite you even when 
> you aren't *using* the IOMMU.

Right, but that's the status quo and most of the time (distro 
kernels) the driver is available, right?

So for all practical purposes we get 99% of the warning power 
without going into chicken-and-egg problems like how do we 
determine that there's an IOMMU area there if there's no IOMMU 
aware code in the kernel, right?

Thanks,

	Ingo

  reply	other threads:[~2012-06-06  8:29 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 [this message]
2012-06-06  8:45               ` David Woodhouse
2012-06-06 23:56                 ` Chris Wright
2012-06-06 23:58         ` Chris Wright
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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