From: Sheng Yang <sheng@linux.intel.com>
Date: Thu, 30 Apr 2009 02:58:42 +0000 (+0800)
Subject: KVM: No disable_irq for MSI/MSI-X interrupt on device assignment
X-Git-Tag: v2.6.32-rc1~693^2~183
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=968a6347936f9421b5bc5358b579e811c52726bc;p=pandora-kernel.git

KVM: No disable_irq for MSI/MSI-X interrupt on device assignment

Disable interrupt at interrupt handler and enable it when guest ack is for
the level triggered interrupt, to prevent reinjected interrupt. MSI/MSI-X don't
need it.

One possible problem is multiply same vector interrupt injected between irq
handler and scheduled work handler would be merged as one for MSI/MSI-X.
But AFAIK, the drivers handle it well.

The patch fixed the oplin card performance issue(MSI-X performance is half of
MSI/INTx).

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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