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[Xen-devel] iommu=0 leading to panic when system defaults to using x2api

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] iommu=0 leading to panic when system defaults to using x2apic
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: 2010年12月10日 09:12:21 +0000
Delivery-date: 2010年12月10日 01:13:23 -0800
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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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