linux-kernel - Re: Seeing DMAR errors after multiple load/unload with SR-IOV

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Message-ID: <20110607153535.GA23047@sequoia.sous-sol.org>
Date:	Tue, 7 Jun 2011 08:35:35 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	padmanabh ratnakar <pratnakarlx@...il.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	iommu <iommu@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: Seeing DMAR errors after multiple load/unload with SR-IOV

* David Woodhouse (dwmw2@...radead.org) wrote:
> On Tue, 2011-06-07 at 08:10 -0700, Chris Wright wrote:
> > * David Woodhouse (dwmw2@...radead.org) wrote:
> > > On Tue, 2011-06-07 at 06:38 -0700, Chris Wright wrote:
> > > > I think we still leak the list entry though.  Bottom line is that we
> > > > need to handle hotplug ADD_DEVICE and DEL_DEVICE notifications.  We
> > > > happen to pick up ADD_DEVICE by accident, but it's all pretty sloppy. 
> > > 
> > > Yeah, keeping a list of possible stale 'pci_dev' pointers is stupid. We
> > > should figure out the matching DMAR unit directly from the ACPI table at
> > > ADD_DEVICE time, and store it in pdev->archdata.iommu.
> > > 
> > > I saw patches which were going in that direction...
> > 
> > Cool, where are they?  I'm working on something similar, and missed them.
> 
> [PATCH] pci, dmar: Update dmar units devices list during hotplug

Oh yeah, thanks for the reminder.

thanks,
-chris
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