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From: Chris Wright <chrisw@sous-sol.org>
To: "Mingarelli, Thomas" <Thomas.Mingarelli@hp.com>
Cc: "dwmw2@infradead.org" <dwmw2@infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"ddutile@redhat.com" <ddutile@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [Intel IOMMU PATCH] Re-evaluate RMRR info for devices removed from si domain
Date: Tue, 28 Feb 2012 14:15:15 -0800	[thread overview]
Message-ID: <20120228221515.GA27235@sequoia.sous-sol.org> (raw)
In-Reply-To: <9774516974AF5F4C8A2C3C69CD3412332034C987@G9W0755.americas.hpqcorp.net>

* Mingarelli, Thomas (Thomas.Mingarelli@hp.com) wrote:
> This patch is being submitted to handle the case where a pci device is
> placed into the si domain, when booting in iommu passthrough mode, then
> removed. The RMRR information for such devices need to be re-processed
> to avoid DMA Read errors due to the Present Bit being cleared in the
> device's context entry.

What happens if that device is attached to a VM, then detached and
rebound to a host driver?  I suspect the reserved memory range won't get
mapped properly for that device in that case.

thanks,
-chris

      reply	other threads:[~2012-02-28 23:06 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-28 17:58 Mingarelli, Thomas
2012-02-28 22:15 ` Chris Wright [this message]

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