Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752563AbaJ1Mmi (ORCPT ); Tue, 28 Oct 2014 08:42:38 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:29566 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751461AbaJ1Mmh (ORCPT ); Tue, 28 Oct 2014 08:42:37 -0400 X-IronPort-AV: E=Sophos;i="5.04,802,1406592000"; d="scan'208";a="186835850" Message-ID: <544F8F3A.3030505@citrix.com> Date: Tue, 28 Oct 2014 12:42:34 +0000 From: Andrew Cooper User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.8.1 MIME-Version: 1.0 To: David Vrabel , Juergen Gross , Ian Campbell CC: , , Subject: Re: [Xen-devel] [PATCH 0/2] xen: Switch to virtual mapped linear p2m list References: <1414421551-31555-1-git-send-email-jgross@suse.com> <544E61DD.8050305@citrix.com> <544F22E4.9040706@suse.com> <1414489898.23883.25.camel@citrix.com> <544F83C1.3010402@citrix.com> <544F8713.9040803@suse.com> <544F8E89.6070006@citrix.com> In-Reply-To: <544F8E89.6070006@citrix.com> Content-Type: text/plain; charset="windows-1252" 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 28/10/14 12:39, David Vrabel wrote: > On 28/10/14 12:07, Juergen Gross wrote: >> Okay, back to the original question: is the (up to) 64 MB virtual >> mapping of the p2m list on 32-bit pv domains a problem or not? > I think up-to 64 MiB of vmalloc area is fine. The vmalloc space can be > increased with a command line option in the unlikely event that there > are domUs that would be affected. > >> If yes, the virtual mapped linear p2m list could still be used on >> 64 bit domains, paving the way for support of more than 512 GB of >> domain memory. OTOH having to keep the p2m tree coding alive isn't >> my favorite solution... > Having to keep both the tree and linear p2m code would be awful. Let's > not do this! > > David How is the toolstack expected to find and mutate this p2m on migrate? The toolstack does not use guest pagetables. ~Andrew -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/