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[Xen-devel] [PATCH 1/2] Fix IOAPIC S3 with interrupt remapping enabled
| To: | Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 1/2] Fix IOAPIC S3 with interrupt remapping enabled |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Fri, 13 Aug 2010 16:59:09 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Fri, 13 Aug 2010 02:01:31 -0700 |
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| Thread-index: | Acs6xcrsojqRwESwQw+QIpImRRpp2g== |
| Thread-topic: | [Xen-devel] [PATCH 1/2] Fix IOAPIC S3 with interrupt remapping enabled |
In ioapic_suspend, it reads and saves ioapic RTEs. But when interrupt remapping is enabled, io_apic_read will call io_apic_read_remap_rte to convert remapped format interrupt to compatible format, this results in 'dest' field may be changed in remap_entry_to_ioapic_rte. When in ioapic_resume, it will write the saved RTEs with incorrect 'dest' to interrupt remapping table. Actually it needn't to convert RTEs regardless interrupt remapping is enabled or not. It just needs to save and restore RTE values directly. This patch just uses __io_apic_read and __io_apic_write, which won't call Interrupt remapping functions to convert, to save and restore RTEs in ioapic_suspend and ioapic_resume. Thus fix this issue. Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
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