linux-kernel - Re: VMI and kmap_atomic_pte paravirt

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Date:	Thu, 25 Feb 2010 12:32:10 -0800
From:	Alok Kataria <akataria@...are.com>
To:	Ian Campbell <Ian.Campbell@...rix.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

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. 

Alok
> 
> Thanks,
> Ian.
> 
> 

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