[Xen-devel] [PATCH] vtd: interrupt remapping: be more defensive

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

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

Attachment: vtd_ir_be_more_defensive.patch
Description: vtd_ir_be_more_defensive.patch

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