From: Kevin Tian <kevin.tian@intel.com>
Date: Tue, 30 Aug 2011 10:56:17 +0000 (+0300)
Subject: KVM: APIC: avoid instruction emulation for EOI writes
X-Git-Tag: v3.2-rc1~119^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=58fbbf26eb01cf6d92cf18da8d14b3a4af9c4b47;p=pandora-kernel.git

KVM: APIC: avoid instruction emulation for EOI writes

Instruction emulation for EOI writes can be skipped, since sane
guest simply uses MOV instead of string operations. This is a nice
improvement when guest doesn't support x2apic or hyper-V EOI
support.

a single VM bandwidth is observed with ~8% bandwidth improvement
(7.4Gbps->8Gbps), by saving ~5% cycles from EOI emulation.

Signed-off-by: Kevin Tian <kevin.tian@intel.com>
<Based on earlier work from>:
Signed-off-by: Eddie Dong <eddie.dong@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

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