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

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #15 from Joel Schopp <joel.schopp@amd.com> ---

> (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?

It's not clear to me which devices were being put in the same group.  Here's
some of my notes on your lspci output

lspci -vt
-[0000:00]-+-00.0  Advanced Micro Devices, Inc. [AMD] Device 1422
           +-00.2  Advanced Micro Devices, Inc. [AMD] Device 1423
           +-01.0  Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon R7 200
Series]
           +-01.1  Advanced Micro Devices, Inc. [AMD/ATI] Device 1308
           +-02.0  Advanced Micro Devices, Inc. [AMD] Device 1424
           +-03.0  Advanced Micro Devices, Inc. [AMD] Device 1424
           +-04.0  Advanced Micro Devices, Inc. [AMD] Device 1424
           +-10.0  Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller
           +-10.1  Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller

These xhci controllers are isolated from from the other devices, I would need
some more detail on which variant you are running to determine if they are
isolated from eachother, they probably aren't.

           +-11.0  Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI
mode]
The sata controller is isolated from the other devices

           +-12.0  Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller
           +-12.2  Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller
This pair of OHCI/EHCI controllers are together isolated from the other devices

           +-13.0  Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller
           +-13.2  Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller
This pair of OHCI/EHCI controllers are together isolated from the other devices

           +-14.0  Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller
           +-14.1  Advanced Micro Devices, Inc. [AMD] FCH IDE Controller
           +-14.2  Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller
           +-14.3  Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge
I do not think the SMBus/IDE/Azalia/LPC are isolated from eachother, but they
are isolated from the other devices I have identified.


           +-14.4-[01]----05.0  Dialogic Corporation PRI
The legacy PCI should be isolated from the other devices identified.  Not sure
what is going on here.

           +-14.5  Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller
This OHCI Controller should also be isolated from the other devices.

           +-15.0-[02]--
           +-15.2-[03]----00.0  ASMedia Technology Inc. ASM1042 SuperSpeed USB
Host Controller
Is this in a PCI-e slot or otherwise attached to the PCI-e?

           +-15.3-[04]----00.0  Qualcomm Atheros QCA8171 Gigabit Ethernet
Is this in a PCI-e slot or otherwise attached to the PCI-e?

           +-18.0  Advanced Micro Devices, Inc. [AMD] Device 141a
           +-18.1  Advanced Micro Devices, Inc. [AMD] Device 141b
           +-18.2  Advanced Micro Devices, Inc. [AMD] Device 141c
           +-18.3  Advanced Micro Devices, Inc. [AMD] Device 141d
           +-18.4  Advanced Micro Devices, Inc. [AMD] Device 141e
           \-18.5  Advanced Micro Devices, Inc. [AMD] Device 141f

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