From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751399Ab2G0KAl (ORCPT ); Fri, 27 Jul 2012 06:00:41 -0400 Received: from smtp.eu.citrix.com ([62.200.22.115]:50980 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751011Ab2G0KAk (ORCPT ); Fri, 27 Jul 2012 06:00:40 -0400 X-IronPort-AV: E=Sophos;i="4.77,666,1336348800"; d="scan'208";a="13731251" Message-ID: <1343383205.6812.137.camel@zakaz.uk.xensource.com> Subject: Re: [Xen-devel] [RFC PATCH] Boot PV guests with more than 128GB (v1) for 3.7 From: Ian Campbell To: Jan Beulich CC: Ian Jackson , Konrad Rzeszutek Wilk , "linux-kernel@vger.kernel.org" , xen-devel Date: Fri, 27 Jul 2012 11:00:05 +0100 In-Reply-To: <501260980200007800090E08@nat28.tlf.novell.com> References: <1343335652-5659-1-git-send-email-konrad.wilk@oracle.com> <501260980200007800090E08@nat28.tlf.novell.com> Organization: Citrix Systems, Inc. Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.4.3-1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2012-07-27 at 08:34 +0100, Jan Beulich wrote: > >>> On 26.07.12 at 22:47, Konrad Rzeszutek Wilk wrote: > > 2). Allocate a new array, copy the existing P2M into it, > > revector the P2M tree to use that, and return the old > > P2M to the memory allocate. This has the advantage that > > it sets the stage for using XEN_ELF_NOTE_INIT_P2M > > feature. That feature allows us to set the exact virtual > > address space we want for the P2M - and allows us to > > boot as initial domain on large machines. > > And I would hope that the tools would get updated to recognize > this note too, so that huge DomU-s would become possible as > well. Does this help us with >160GB 32 bit PV guests too? I'm guessing not since the real limitation there is the relatively small amount of kernel address space.