From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 81841] amd-iommu: kernel BUG & lockup after shutting down KVM
 guest using PCI passthrough/PCIe bridge
Date: Tue, 09 Sep 2014 15:25:51 +0000
Message-ID: <bug-81841-28872-KKJZq25HSi@https.bugzilla.kernel.org/>
References: <bug-81841-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=81841

--- Comment #21 from Marti Raudsepp <marti@juffo.org> ---
(In reply to Joel Schopp from comment #20)
> What updates are you looking for?  Joerg's fix is now upstream.

Yes, but there's still the issue with southbridge component isolation. You
requested more information from me in comment #15 that I provided in comment
#17.

For background see comment #9 from Alex Williamson:
> AMD would need to confirm it.  IOMMU groups are based on hardware advertised
> isolation via the PCIe ACS capability.  Without this, or a device specific
> quirk to take its place, IOMMU groups must assume that peer-to-peer between
> functions of a multi-function device is possible and therefore that the
> devices are not isolated. [...]

> I think the path forward is to get confirmation from AMD that these function
> are isolated from each other and add quirks to the kernel.  Then you won't
> have the device dependencies in vfio-pci.  The override patch allows you to
> do that with just a kernel boot parameter.  There's no gurantee that
> pci-assign will ever be fixed since it's being phased out.

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