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[Xen-devel] [PATCH][FIX] Possible fix for spurious interrupts
| To: | xen-devel Devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH][FIX] Possible fix for spurious interrupts |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 13 Apr 2006 19:12:04 +0100 |
| Cc: | Michele <vo.sinh@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Thu, 13 Apr 2006 11:11:48 -0700 |
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Here is a patch that appears to fix the spurious interrupt problems for me. This is inspired by Jan's observation that the IO-APIC mask/unmask that we do for ISR processing seems to cause corruption of other routing entries. So the fix here is to do the same as native Linux -- do not mask/unmask, but instead send EOI after doing ISR processing. To confirm this really was the problem I modified native Linux to do the same as Xen currently does (mask before ISR processing; unmask after). I then got lots of spurious USB interrupts even on native Linux! :-( Please test... I'll put it in xen-unstable tomorrow if there are no complaints and it will be a strong candidate for the next 3.0.2 release too. -- Keir
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