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authorKevin Tian <kevin.tian@intel.com>2011-08-30 14:56:17 +0400
committerAvi Kivity <avi@redhat.com>2011-09-25 20:52:17 +0400
commit58fbbf26eb01cf6d92cf18da8d14b3a4af9c4b47 (patch)
tree738874a15a233eed6e2e18d9cfe99f09482e8b17 /Documentation/virtual
parent45133ecaaec7aea447afc98cc2c24aac638bbe5c (diff)
downloadlinux-58fbbf26eb01cf6d92cf18da8d14b3a4af9c4b47.tar.xz
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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