[Bug 290920] FreeBSD 15 kernel EFI frame buffer bug

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290920

--- 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 being
correctly mapped by the hypervisor into a signal the guest OS can understand.

Commits touching the core interrupt handling between the host's IOMMU hardware
(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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