From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 123C0C43457 for ; Thu, 15 Oct 2020 13:10:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9FC9F2225C for ; Thu, 15 Oct 2020 13:10:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="GiwHxNBo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728470AbgJONKt (ORCPT ); Thu, 15 Oct 2020 09:10:49 -0400 Received: from esa2.hc3370-68.iphmx.com ([216.71.145.153]:60404 "EHLO esa2.hc3370-68.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728231AbgJONKt (ORCPT ); Thu, 15 Oct 2020 09:10:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1602767449; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=f6Kamy1C8O875JTu/vLF90Ddc8FWBrVKHooa1uTjaeQ=; b=GiwHxNBo3AM1dAKmOq+ocxQ12EWakbP8ln/kaGJjlJ52EMDN/Y6cZbkB IA/R1iInSnZw+ESaqiNN8y0qv17WgiENehjA7NTxmvPyvUiEAHY21Si3C z82oIZukBDcB7oDVkiJ1PDvxyKMpfTHhA/iKGrPAZ+sLUaxZhwqBxEBur 8=; Authentication-Results: esa2.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: TsNzbLxMsk384nJy5Ma5vOQoKEjgU+ipNL1nJSmtDZ6qs87H2v+vbvQIN4MbbD72V2Ey2BJWzK DJ2By9UKxVmig34H8L3MwHOYlSQxz2DBF8RnLL026OOdZRjfNPY566lXkCEMWpefwuzoeGsvFt SnTPGz44+AtTSC4bBi08uZqWHQKJcn+DFJ+74bUEgEdXNlB7yWOUEr2CPons5/qNhxHYKojNNA H5bJ7MetpyQXJ0vK5ZCl6jO/6csbfhHTojPmAvbq5tYkHveVjp4yyTrmmaBCv2pnjkGKD8M7ZL 4Bg= X-SBRS: 2.5 X-MesageID: 29078535 X-Ironport-Server: esa2.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.77,379,1596513600"; d="scan'208";a="29078535" Subject: Re: [PATCH 2/2] xen: Kconfig: nest Xen guest options To: , Jason Andryuk , "Juergen Gross" , Stefano Stabellini CC: Thomas Gleixner , Ingo Molnar , Borislav Petkov , , "H. Peter Anvin" , , References: <20201014175342.152712-1-jandryuk@gmail.com> <20201014175342.152712-3-jandryuk@gmail.com> <6cd9363c-ac0c-ea68-c8e7-9fd3cd30a89b@oracle.com> From: Andrew Cooper Message-ID: <4e31301b-0e57-ac89-cd71-6ad5e1a66628@citrix.com> Date: Thu, 15 Oct 2020 14:10:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <6cd9363c-ac0c-ea68-c8e7-9fd3cd30a89b@oracle.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-GB X-ClientProxiedBy: AMSPEX02CAS02.citrite.net (10.69.22.113) To FTLPEX02CL05.citrite.net (10.13.108.178) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15/10/2020 13:37, boris.ostrovsky@oracle.com wrote: > On 10/14/20 1:53 PM, Jason Andryuk wrote: >> +config XEN_512GB >> + bool "Limit Xen pv-domain memory to 512GB" >> + depends on XEN_PV && X86_64 > > Why is X86_64 needed here? >512G support was implemented using a direct-mapped P2M, and is rather beyond the virtual address capabilities of 32bit. ~Andrew