[Xen-devel] [PATCH] vt-d: enhance the support of Interrupt Remapping EIM and x2APIC

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Hi Keir,
Attached are 3 patches to enhance the support of Interrupt Remapping EIM and 
x2APIC in Xen.

Now Xen enables x2APIC if it finds BSP supports x2APIC, but this is not proper: 
we also have to check all the VT-d engines' IR and if all IR units support EIM, 
we will enable x2APIC and EIM.
EIM enables external devices to deliver interrupts (via IOAPIC or MSI) to CPUs 
with >8-bit APIC ID. Without EIM, even we enabled x2APIC in CPU's side, 
external devices can't deliver interrupt to CPUs with >8-bit APIC ID -- this 
kind of software usage is not architecturally proper. The recommended usage 
model is: we should only enable x2APIC and EIM when they are both supported by 
CPU and VT-d IR engines on the system.

Thanks,
-- Dexuan

Attachment: 01.patch
Description: 01.patch

Attachment: 02.patch
Description: 02.patch

Attachment: 03.patch
Description: 03.patch

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