Re: Hard and silent lock up since linux 3.14 with PCIe pass through (vfio)

[Bjorn Helgaas <bhelgaas@google.com>]

On Fri, Oct 10, 2014 at 3:39 AM, Andreas Hartmann
<andihartmann@freenet.de> wrote:
> shortly: I retested w/ qemu 2.1.0 and Linux 3.17.0 - no change in behaviour.
>
> Alex Williamson wrote:
>> On Tue, 2014-09-23 at 21:03 +0200, Andreas Hartmann wrote:
>>> Hello!
>>>
>>> Since long time now, I'm using w/o any problem PCIe pass through with a
>>> Gigabyte GA-990XA-UD3/GA-990XA-UD3 mainboard (AMD 990X chipset) and
>>> enabled IOMMU with vfio-pci.
>>>
>>> The last kernel working w/o any problem is kernel 3.13.7 (I didn't use
>>> .8 and .9, but I do not think they would have been problematic).
>>>
>>> Since 3.14.19 (I didn't test any 3.14 kernel before) I'm encountering a
>>> hard and silent lock up of the complete machine when starting the VM
>>> with the PCIe card passed through.

Since we're not really making any progress on this yet, would it be
possible to bisect it?  We already know that 3.13.7 works and 3.14.19
fails, and "git bisect start v3.14 v3.13" says it's about 13 steps.  I
know that's still quite a bit of work, but at least it sounds like the
problem is easy to reproduce.

Bjorn