[Bug 81841] amd-iommu: kernel BUG & lockup after shutting down KVM guest using PCI passthrough/PCIe bridge

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https://bugzilla.kernel.org/show_bug.cgi?id=81841

--- Comment #13 from Marti Raudsepp <marti@juffo.org> ---
(In reply to Joerg Roedel from comment #12)
> Thanks, Joerg

Indeed. Thanks, Joerg. And thanks everyone else too, you have been very
helpful!

I didn't have v3.13 sources handy, but I applied the attachment 146311 patch to
3.16.0 and it fixes the problem. (I verified that unpatched 3.16.0 also
crashes).

I can start & shut down the VM multiple times without crashing the host and PCI
passthrough works as expected.

Feel free to add
    Tested-by: Marti Raudsepp <marti@juffo.org>

(In reply to Alex Williamson from comment #7)
> Note that it's not required to assign all the devices, they simply need to
> be detached from host drivers (ie. bound to pci-stub or vfio-pci).

This approach also works; I think I will go this route for the production
setup. Seems that we don't actually need any of the devices in the same IOMMU
group.

(In reply to Joel Schopp from comment #10)
> > AMD would need to confirm it.
>
> I don't have an answer for you offhand.  Let me do some digging and get you
> an answer.

I am sorry if I sounded frustrated or arrogant earlier. Any update on this?

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