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[Xen-devel] [PATCH v2 0/2] AMD/IOMMU: improve x2APIC handling when XT is unavailable

To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Jan Beulich <jbeulich@xxxxxxxx>
Date: Fri, 28 Feb 2020 13:09:15 +0100
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
Delivery-date: Fri, 28 Feb 2020 12:09:09 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

For AMD the connection between IOMMU and x2APIC is less strong,
hence even if unlikely to occur we would better deal correctly
with XT being unavailable (for whatever reasons) in particular
when x2APIC is already enabled on a system.

1: correct handling when XT's prereq features are unavailable
2: without XT, x2APIC needs to be forced into physical mode

Jan

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Follow-Ups:
- [Xen-devel] [PATCH v2 2/2] AMD/IOMMU: without XT, x2APIC needs to be forced into physical mode
  - From: Jan Beulich
- [Xen-devel] [PATCH v2 1/2] AMD/IOMMU: correct handling when XT's prereq features are unavailable
  - From: Jan Beulich

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