From mboxrd@z Thu Jan 1 00:00:00 1970 From: Herbert Xu Subject: Re: RFC: [0/2] Remove netloop by lazy copying in netback Date: Tue, 27 Mar 2007 20:06:10 +1000 Message-ID: <20070327100610.GA25437@gondor.apana.org.au> References: <20070327092028.GA25077@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Keir Fraser Cc: Isaku Yamahata , Xen Development Mailing List List-Id: xen-devel@lists.xenproject.org On Tue, Mar 27, 2007 at 10:58:46AM +0100, Keir Fraser wrote: > > Yet another bloody grant-table hypercall! Also there's the question of where > this lazy state gets squirrelled away until the demand mapping occurs. > Perhaps the p2m is usable in this case, since I expect we have plenty of > spare bits for a not-present entry... But anyway, we don't have the luxury > of a p2m to stick things in the x86 case. Sorry I don't get it. What if we called it a page table operation, would that make it better :) In other words, what exactly is wrong with having such an operation? As for a place to store the info, we can just store the real MFN in the p2m table but mark it as not present. > I'll take a closer look at your original patch. Having viewed the > alternatives I don't hate it so much now. :-) Thanks, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt