Demi Marie Obenour comments

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                                            Demi Marie Obenour

sys-usb kworker events CPU consumption

I suspect this is an interrupt storm: the hardware attached to sys-usb is creating so many interrupts that it is making the overall system lag. The reason is that sys-usb...

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

Ouch. This is actually a security concern: passing e.g. your primary SSD to sys-net would be bad. The only solution I can think of is to identify devices by PCI...

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

@unman is there any sort of identifier associated with a physical slot on the motherboard somewhere, and which cannot change?

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

@unman friendly ping

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

@brendanhoar: I don’t know if sys-gui w/o dom0 fallback is going to happen. For one, it would likely block a port to Apple Silicon, as the GPU is not behind...

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

@marmarek: do you know what the PCIe Location Path that Microsoft refers to is? @brendanhoar On a Thunderbolt system, plugging or unplugging a Thunderbolt device should not cause the numbers...

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

> > For one, it would likely block a port to Apple Silicon, as the GPU is not behind an SMMU (ARM IOMMU) on that platform. > > That's irrelevant...

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

Is it also used when programming the IOMMU?

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

> Short answer: yes. At least for VT-d, DMAR ACPI table describes mapping BDF to IOMMU engines. When BDF changes due to adding or removing a card, does the DMAR...

Wrong PCIe devices get passed through to wrong qubes after adding new PCIe cards

Ah, good point.