[Bug 288122] msi_map: unsupported destination APIC ID 257

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288122

--- Comment #14 from dwmw2@infradead.org ---
(In reply to Konstantin Belousov from comment #13)

From the hypervisor side we want to not even offer the guests the *possibility*
of using DMA translation. It can't be up to guest configuration.

For the Intel IOMMU that works because we can just refrain from advertising any
of 3-level, 4-level or 5-level page tables in SAGAW. For the AMD IOMMU there is
no such trick. Obviously the 15-bit enlightenment is best because it Just
Works™ without having to emulate an IOMMU at all.

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