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[Xen-devel] [PATCH] vtd: interrupt remapping: be more defensive
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] vtd: interrupt remapping: be more defensive |
| From: | "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
| Date: | Wed, 24 Feb 2010 17:25:20 +0800 |
| Accept-language: | zh-CN, en-US |
| Acceptlanguage: | zh-CN, en-US |
| Cc: | |
| Delivery-date: | Wed, 24 Feb 2010 01:25:59 -0800 |
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| Thread-index: | Acq1M0itT/pq8zpSSf21BBOlCVq0Bg== |
| Thread-topic: | [PATCH] vtd: interrupt remapping: be more defensive |
1) A buggy BIOS may not report IOAPIC in DRHD. Currently we still try to enable IR while the IOAPIC RTEs are still in non-remappable format and the host would hang. The patch detects this case and will not try to enable IR. 2) Currently HPET's MSI mode doesn't work if IR is enabled because we have no code to allocate IRTE for it. Luckily this HW configuration is rather rarely at present, we can just work it around by only using HPET's IOAPIC mode for now. Thanks, -- Dexuan
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