RE: [PATCH v2] KVM: APIC: avoid instruction emulation for EOI writes

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> From: Avi Kivity [mailto:avi@xxxxxxxxxx]
> Sent: Tuesday, August 30, 2011 6:57 PM
> 
> On 08/30/2011 04:15 AM, Tian, Kevin wrote:
> > v2 changes:
> > 	define exit qualification fields for APIC-Access in vmx.h
> > 	use apic_reg_write instead of apic_set_eoi, to avoid breaking tracing
> > 	add fasteoi option to allow disabling this acceleration
> >
> > ----
> >
> > commit 2a66a12cb6928c962d24907e6d39b6eb9ac94b4b
> > Author: Kevin Tian<kevin.tian@xxxxxxxxx>
> > Date:   Mon Aug 29 13:08:28 2011 +0800
> >
> >      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.
> >
> >
> 
> Thanks, applied.  Please use git format-patch (and git send-email)
> instead of git show in the future.
> 

OK, and sorry for the formatting issue.

Thanks
Kevin
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