[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 #17 from Marti Raudsepp <marti@juffo.org> ---
It's an ASRock FM2A88X Extreme6+ motherboard with the AMD A88X (Bolton-D4)
chipset.

There are 12 IOMMU groups on the system. The problematic group for me is number
9 because the legacy PCI bridge (14.4) gets mixed in with other southbridge
devices (all 14.*).

/sys/kernel/iommu_groups/0/devices:
0000:00:00.0 -> ../../../../devices/pci0000:00/0000:00:00.0

/sys/kernel/iommu_groups/1/devices:
0000:00:01.0 -> ../../../../devices/pci0000:00/0000:00:01.0
0000:00:01.1 -> ../../../../devices/pci0000:00/0000:00:01.1

/sys/kernel/iommu_groups/2/devices:
0000:00:02.0 -> ../../../../devices/pci0000:00/0000:00:02.0

/sys/kernel/iommu_groups/3/devices:
0000:00:03.0 -> ../../../../devices/pci0000:00/0000:00:03.0

/sys/kernel/iommu_groups/4/devices:
0000:00:04.0 -> ../../../../devices/pci0000:00/0000:00:04.0

/sys/kernel/iommu_groups/5/devices:
0000:00:10.0 -> ../../../../devices/pci0000:00/0000:00:10.0
0000:00:10.1 -> ../../../../devices/pci0000:00/0000:00:10.1

/sys/kernel/iommu_groups/6/devices:
0000:00:11.0 -> ../../../../devices/pci0000:00/0000:00:11.0

/sys/kernel/iommu_groups/7/devices:
0000:00:12.0 -> ../../../../devices/pci0000:00/0000:00:12.0
0000:00:12.2 -> ../../../../devices/pci0000:00/0000:00:12.2

/sys/kernel/iommu_groups/8/devices:
0000:00:13.0 -> ../../../../devices/pci0000:00/0000:00:13.0
0000:00:13.2 -> ../../../../devices/pci0000:00/0000:00:13.2

/sys/kernel/iommu_groups/9/devices:
0000:00:14.0 -> ../../../../devices/pci0000:00/0000:00:14.0
0000:00:14.1 -> ../../../../devices/pci0000:00/0000:00:14.1
0000:00:14.2 -> ../../../../devices/pci0000:00/0000:00:14.2
0000:00:14.3 -> ../../../../devices/pci0000:00/0000:00:14.3
0000:00:14.4 -> ../../../../devices/pci0000:00/0000:00:14.4
0000:00:14.5 -> ../../../../devices/pci0000:00/0000:00:14.5
0000:01:05.0 -> ../../../../devices/pci0000:00/0000:00:14.4/0000:01:05.0

    [When I plug in a card to the other legacy PCI slot, it also appears here
as
     pci0000:00/0000:00:14.4/0000:01:06.0]

/sys/kernel/iommu_groups/10/devices:
0000:00:15.0 -> ../../../../devices/pci0000:00/0000:00:15.0
0000:00:15.2 -> ../../../../devices/pci0000:00/0000:00:15.2
0000:00:15.3 -> ../../../../devices/pci0000:00/0000:00:15.3
0000:03:00.0 -> ../../../../devices/pci0000:00/0000:00:15.2/0000:03:00.0
0000:04:00.0 -> ../../../../devices/pci0000:00/0000:00:15.3/0000:04:00.0

/sys/kernel/iommu_groups/11/devices:
0000:00:18.0 -> ../../../../devices/pci0000:00/0000:00:18.0
0000:00:18.1 -> ../../../../devices/pci0000:00/0000:00:18.1
0000:00:18.2 -> ../../../../devices/pci0000:00/0000:00:18.2
0000:00:18.3 -> ../../../../devices/pci0000:00/0000:00:18.3
0000:00:18.4 -> ../../../../devices/pci0000:00/0000:00:18.4
0000:00:18.5 -> ../../../../devices/pci0000:00/0000:00:18.5

(In reply to Joel Schopp from comment #15)
> 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

Other than the 14.* devices everything seems to be as you describe.

>            +-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.

Ok, that's not a problem.

>            +-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.

Yep, currently shares group 9.

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

Also shares group 9.

>            +-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?

Nope, this is integrated on the motherboard. The only used PCI slot is the
Dialogic card.

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

Integrated Ethernet.

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