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[Xen-devel] IRQ migration (c/s 20370 + 20465)

To: <edwin.zhai@xxxxxxxxx>,<xiantao.zhang@xxxxxxxxx>
Subject: [Xen-devel] IRQ migration (c/s 20370 + 20465)
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Mon, 29 Nov 2010 13:14:50 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Edwin, Xiantao,

I'm observing I/O-APIC IRQs never getting migrated on a system
using directed EOI. Looking at end_level_ioapic_irq(), I fail
to see how that case is being handled (other than in the Linux
implementation, which this code supposedly is a clone of).

Additionally it seems wasteful to check whether to move the IRQ in
mask_and_ack_level_ioapic_irq(), as ack_APIC_irq() cannot
possibly have resulted in clearing any of the IRR bits that
io_apic_level_ack_pending() is looking at.

Thanks for any comments, Jan


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