From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755557AbaIQOn7 (ORCPT ); Wed, 17 Sep 2014 10:43:59 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:64183 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754786AbaIQOn6 (ORCPT ); Wed, 17 Sep 2014 10:43:58 -0400 X-IronPort-AV: E=Sophos;i="5.04,540,1406592000"; d="scan'208";a="173312238" Message-ID: <54199E23.7090403@citrix.com> Date: Wed, 17 Sep 2014 15:43:47 +0100 From: David Vrabel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.5.0 MIME-Version: 1.0 To: Juergen Gross , , , , , Subject: Re: [PATCH V2 0/3] xen: remove some memory limits from pv-domains References: <1410927157-15069-1-git-send-email-jgross@suse.com> In-Reply-To: <1410927157-15069-1-git-send-email-jgross@suse.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/09/14 05:12, Juergen Gross wrote: > When a Xen pv-domain is booted the initial memory map contains multiple > objects in the top 2 GB including the initrd and the p2m list. This > limits the supported maximum size of the initrd and the maximum > memory size the p2m list can span is limited to about 500 GB. > > Xen however supports loading the initrd without mapping it and the > initial p2m list can be mapped by Xen to an arbitrary selected virtual > address. The following patches activate those options and thus remove > the limitations. > > It should be noted that the p2m list limitation isn't only affecting > the amount of memory a pv domain can use, but it also hinders Dom0 to > be started on physical systems with larger memory without reducing it's > memory via a Xen boot parameter. By mapping the initial p2m list to > an area not in the top 2 GB it is now possible to boot Dom0 on such > systems. > > It would be desirable to be able to use more than 512 GB in a pv > domain, but this would require a reorganization of the p2m tree built > by the kernel at boot time. As this reorganization would affect the > Xen tools and kexec, too, it is not included in this patch set. This > topic can be addressed later. > > Juergen Gross (3): > xen: sync some headers with xen tree > xen: eliminate scalability issues from initrd handling I've applied these two to devel/for-linus-3.18. Thanks. David