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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D290920

--- Comment #6 from dan@sunsaturn.com ---
sys/dev/vmm/vmm.c is suspect here:

Symptom: The GPU failed with "no GSI" / "can't derive routing". GSI (Global
System Interrupt) is a Linux concept, but it means the physical interrupt
signal from the passed-through PCI device (GPU or USB controller) is not be=
ing
correctly mapped by the hypervisor into a signal the guest OS can understan=
d.

Commits touching the core interrupt handling between the host's IOMMU hardw=
are
(VT-d/AMD-Vi) and the virtualized environment are the prime suspects. Look =
for
PRs that:

Refactor or clean up the MSI/MSI-X handling within the vmm driver.

Update core IOMMU register access or error handling code.

Change the logic for x2APIC or IO-APIC interrupt injection into the guest.

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