From: Avi Kivity <avi@qumranet.com>
Date: Tue, 17 Jun 2008 22:36:36 +0000 (-0700)
Subject: KVM: ioapic: fix lost interrupt when changing a device's irq
X-Git-Tag: v2.6.26-rc8~3^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4fa6b9c5dc4134bdeac341d731a87783cc11ca10;p=pandora-kernel.git

KVM: ioapic: fix lost interrupt when changing a device's irq

The ioapic acknowledge path translates interrupt vectors to irqs.  It
currently uses a first match algorithm, stopping when it finds the first
redirection table entry containing the vector.  That fails however if the
guest changes the irq to a different line, leaving the old redirection table
entry in place (though masked).  Result is interrupts not making it to the
guest.

Fix by always scanning the entire redirection table.

Signed-off-by: Avi Kivity <avi@qumranet.com>
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