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[Xen-devel] Re: [PATCH] IRQ: manually EOI migrating line interrupts
| To: | Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] IRQ: manually EOI migrating line interrupts |
| From: | Keir Fraser <keir@xxxxxxx> |
| Date: | Tue, 30 Aug 2011 15:38:53 +0100 |
| Cc: | |
| Delivery-date: | Tue, 30 Aug 2011 07:39:49 -0700 |
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| Thread-topic: | [PATCH] IRQ: manually EOI migrating line interrupts |
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On 30/08/2011 15:28, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx> wrote:
>> @@ -1739,6 +1739,14 @@ static void end_level_ioapic_irq (unsign
>> */
>> i = IO_APIC_VECTOR(irq);
>>
>> + /* Manually EOI the old vector if we are moving to the new */
>> + if ( vector && i != vector )
>> + {
>> + int ioapic;
>> + for (ioapic = 0; ioapic < nr_ioapics; ioapic++)
>> + io_apic_eoi(ioapic, i);
>> + }
>> +
I don't know whether it's worth the effort, but we ought to be able to do
better than this and send EOI to exactly the correct IO-APIC. I think
irq=gsi here? And we should know the gsi_base of every IO-APIC, so we can
work out in fact which pin of which IO-APIC needs clobbering?
-- Keir
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