[Xen-devel] iommu=0 leading to panic when system defaults to using x2apic

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

Why wouldn't iommu=0 imply not using the x2apic, if use of the
iommu indeed is a prerequisite (which by itself seems questionable
as long as APIC IDs aren't wider than 8 bits)?

Looking further at enable_bsp_x2apic(), I also wonder whether
the pre-enabled case, when specifying iommu=0 and x2apic=0,
can actually work if iommu=0 is a prerequisite (intremap_enabled()
would return 1 in that case afaics, so the early check doesn't help).

Thanks, Jan


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