[Bug 215906] DMAR fault when connected usb hub (xhci_hcd)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215906

--- Comment #1 from Royston Shufflebotham (royston@shufflebotham.org) ---
I just hit exactly the same issue when upgrading the kernel from v5.13.0-40 to
v5.15.0-27. With no devices plugged in, the USB hub reports everything as ok.
Plugging in a USB keyboard worked for a minute or two, and then I get exactly
the same errors from [+0,229229] to [+0,000004] above.

Same USB controller chipset as OP by the looks of things. I've managed to list
the Capabilities in case that's any help:
03:00.0 USB controller: VIA Technologies, Inc. VL805/806 xHCI USB 3.0
Controller (rev 01) (prog-if 30 [XHCI])
        Subsystem: VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller
        Flags: bus master, fast devsel, latency 0, IRQ 28, IOMMU group 12
        Memory at e0a00000 (64-bit, non-prefetchable) [size=4K]
        Capabilities: [80] Power Management version 3
        Capabilities: [90] MSI: Enable+ Count=1/4 Maskable- 64bit+
        Capabilities: [c4] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Kernel driver in use: xhci_hcd
        Kernel modules: xhci_pci

Downgrading back to v5.13.0-40 fixes the problem.

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