[Xen-devel] [PATCH 3/3] x2APIC: improve enabling logic

["Han, Weidong" <weidong.han@xxxxxxxxx>]

        This patch masks PIC and IOAPIC RTE's before x2APIC enabling, unmask 
and restore them after x2APIC enabling. It also really enables interrupt 
remapping before x2APIC enabling instead of just checking interrupt remapping 
setting.
        This patch also handles all x2APIC configuration including BIOS 
settings and command line settings. Especially, it handles that BIOS hands over 
in x2APIC mode (when there is apic id > 255). It checks if x2APIC is already 
enabled by BIOS. If already enabled, it will disable interrupt remapping and 
queued invalidation first, then enable them again.


Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>

Attachment: x2apic-logic.patch
Description: x2apic-logic.patch

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