2 GB RAM limit for PCI passthrough of USB controller?

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Sven Semmler

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Dec 8, 2019, 2:50:02 PM12/8/19

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Hi,

this is a limitation that pleagues me on my otherwise excellent working Qubes setup:

* Whenever I assign the USB controller (Intel Sunrise Point-H USB 3.0 xHCI) to a qube, regardless of the operating system (Debian or Windows) it crashes. If I stay below or equal to 2 GB there are no problems.

* Windows doesn't even start
* Debian boots but whenever I attempt using a USB device it immediately crashes the qube
* The very same qubes without the USB controller or with 2GB memory assigned work perfectly

Yes 2GB are plenty but if you are doing development (IDE, compiler, analyzer tools ...) 2GB can get tight quickly.

* Do others have simliar issues or is this specific to my setup?
* Is there anything Qubes or Xen specific I could look into (settings, logs etc)?
* What could explain this behavior?

/Sven

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