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[Xen-devel] [PATCH] enable directed EOI

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: [Xen-devel] [PATCH] enable directed EOI
From: "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
Date: Wed, 18 Nov 2009 17:48:54 +0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
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This patch enables directed EOI on latest processor. With this, the
broadcast of EOI would be suppressed upon LAPIC EOI, so VMM is
required to perform a directed EOI to the IOxAPIC generating the
interrupt by writting to its EOI register.(Pls. refer SDM 3A 10.5.5)

This is useful for ioapic_ack_old to avoid the spurious interrupt
storm, which is the reason why ioapic_ack_new is used.

Signed-Off-By: Zhai Edwin <edwin.zhai@xxxxxxxxx>

Attachment: directed_eoi_enabling.patch
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