linux-kernel - Re: VMI and kmap_atomic_pte paravirt

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Message-ID: <1267175072.11737.11908.camel@zakaz.uk.xensource.com>
Date:	Fri, 26 Feb 2010 09:04:32 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	"akataria@...are.com" <akataria@...are.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: VMI and kmap_atomic_pte paravirt_op

On Thu, 2010-02-25 at 20:32 +0000, Alok Kataria wrote:
> Hi Ian, 
> 
> On Thu, 2010-02-25 at 11:52 -0800, Ian Campbell wrote:
> > Hi Alok,
> > 
> > How critical is the vmi_kmap_atomic_pte pv_mmu_op hook to VMI? Is it
> > required for correct functionality or is it simply an optimisation?
> > 
> > We think we may be able to do away with the Xen version of the hook and
> > if VMI (which is deprecated) can live without it and you agree then I'll
> > cook up a patch to remove it altogether.
> 
> As Jeremy suggests we will be fine with disabling high ptes for VMI. 
> Thanks for doing this. 

OK, I'll do that.

Thanks,
Ian.


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