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

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Message-ID: <1346628440.3170.3.camel@offbook>
Date:	Mon, 03 Sep 2012 01:27:20 +0200
From:	Davidlohr Bueso <dave@....org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, KVM <kvm@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: VMX: invalidate vpid for invlpg instruction

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?

> 
> Single-context. If the INVVPID type is 1, the logical processor
> invalidates all
> linear mappings and combined mappings associated with the VPID specified
> in the INVVPID descriptor.
> 
> 


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