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[Xen-devel] [PATCH 3/3] x2APIC: improve enabling logic
| To: | Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 3/3] x2APIC: improve enabling logic |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Mon, 5 Jul 2010 15:08:17 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Mon, 05 Jul 2010 00:11:59 -0700 |
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| Thread-index: | AcscENfSBw39p7IIR966IMA7J7OKAg== |
| Thread-topic: | [PATCH 3/3] x2APIC: improve enabling logic |
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>
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