linux-kernel - Re: [PATCH] KVM: VMX: invalidate vpid for invlpg instruction

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Message-ID: <50447442.2050307@redhat.com>
Date:	Mon, 03 Sep 2012 12:11:30 +0300
From:	Avi Kivity <avi@...hat.com>
To:	dave@....org
CC:	Marcelo Tosatti <mtosatti@...hat.com>, KVM <kvm@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: VMX: invalidate vpid for invlpg instruction

On 09/03/2012 02:27 AM, Davidlohr Bueso wrote:
> On Fri, 2012-08-31 at 14:37 -0300, Marcelo Tosatti wrote:
>> On Fri, Aug 31, 2012 at 06:10:48PM +0200, Davidlohr Bueso wrote:
>> > For processors that support VPIDs we should invalidate the page table entry
>> > specified by the lineal address. For this purpose add support for individual
>> > address invalidations.
>> 
>> Not necessary - a single context invalidation is performed through
>> KVM_REQ_TLB_FLUSH.
> 
> Since vpid_sync_context() supports both single and all-context vpid
> invalidations, wouldn't it make sense to also add individual address
> ones as well, supporting further granularity?

It might.  Do you have benchmarks supporting this?

-- 
error compiling committee.c: too many arguments to function
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