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=-6.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 C4141C43461 for ; Thu, 3 Sep 2020 16:38:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A85D20578 for ; Thu, 3 Sep 2020 16:38:53 +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="Io7Y/6j5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728646AbgICQiw (ORCPT ); Thu, 3 Sep 2020 12:38:52 -0400 Received: from esa4.hc3370-68.iphmx.com ([216.71.155.144]:25354 "EHLO esa4.hc3370-68.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726990AbgICQit (ORCPT ); Thu, 3 Sep 2020 12:38:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1599151128; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=1r9p2+RFoF3u+hOb93ac0ysyr0EJPEppHknwa791fSA=; b=Io7Y/6j5GZ3IHmYkbGqKfewzhAvtnLOM8W6dzlShv2LVvKOuAVn6gcc9 QTKwdywHLXMaAMfxvbE23O2qeRhvwpvYH3C8tfNZCJuODuK2tcMD/vXPv iBQd6oUWIa3c5jOv6ro0Atn5Mf/T4FfTdw5hkUYDn11hrIFsNDVSZmn5y A=; Authentication-Results: esa4.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: n1UBm6NTmzRoEEmp6chXaBm2JeGlv1UPeWW4NcDpE6MmwKaEEug3qgxA4LMjLaJkfVteFGd+aK UyQpDEBtpjDgR7UYwd0Jg33GV7o86inlKKFgsaaHyJNUflCzFSfwopxMOWerSgF0XhG9sEzEfL 4RRD4RotP+qyYV2hpJYsl3r0gsfqUIOsSdH5lSVHXWp122/oY9ooFXECyGx/srx7sfWn8zfJG2 vY03kGbKprm5mmB9gPqzwmUs7bHHXQflmjbxrqlmteL5zA03CFuteALBCgRnmyTsXmwaj14XY0 bkc= X-SBRS: 2.7 X-MesageID: 26904079 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.76,387,1592884800"; d="scan'208";a="26904079" Date: Thu, 3 Sep 2020 18:38:37 +0200 From: Roger Pau =?utf-8?B?TW9ubsOp?= To: =?utf-8?B?SsO8cmdlbiBHcm/Dnw==?= CC: , Oleksandr Andrushchenko , David Airlie , "Daniel Vetter" , Boris Ostrovsky , Stefano Stabellini , Dan Carpenter , Wei Liu , Yan Yankovskyi , , , , David Hildenbrand , Michal Hocko , Dan Williams Subject: Re: [PATCH v5 3/3] xen: add helpers to allocate unpopulated memory Message-ID: <20200903163837.GM753@Air-de-Roger> References: <20200901083326.21264-1-roger.pau@citrix.com> <20200901083326.21264-4-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-ClientProxiedBy: AMSPEX02CAS02.citrite.net (10.69.22.113) To FTLPEX02CL06.citrite.net (10.13.108.179) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 03, 2020 at 05:30:07PM +0200, Jürgen Groß wrote: > On 01.09.20 10:33, Roger Pau Monne wrote: > > To be used in order to create foreign mappings. This is based on the > > ZONE_DEVICE facility which is used by persistent memory devices in > > order to create struct pages and kernel virtual mappings for the IOMEM > > areas of such devices. Note that on kernels without support for > > ZONE_DEVICE Xen will fallback to use ballooned pages in order to > > create foreign mappings. > > > > The newly added helpers use the same parameters as the existing > > {alloc/free}_xenballooned_pages functions, which allows for in-place > > replacement of the callers. Once a memory region has been added to be > > used as scratch mapping space it will no longer be released, and pages > > returned are kept in a linked list. This allows to have a buffer of > > pages and prevents resorting to frequent additions and removals of > > regions. > > > > If enabled (because ZONE_DEVICE is supported) the usage of the new > > functionality untangles Xen balloon and RAM hotplug from the usage of > > unpopulated physical memory ranges to map foreign pages, which is the > > correct thing to do in order to avoid mappings of foreign pages depend > > on memory hotplug. > > > > Note the driver is currently not enabled on Arm platforms because it > > would interfere with the identity mapping required on some platforms. > > > > Signed-off-by: Roger Pau Monné > > Sorry, I just got a build error for x86 32-bit build: > > WARNING: unmet direct dependencies detected for ZONE_DEVICE > Depends on [n]: MEMORY_HOTPLUG [=n] && MEMORY_HOTREMOVE [=n] && > SPARSEMEM_VMEMMAP [=n] && ARCH_HAS_PTE_DEVMAP [=n] > Selected by [y]: > - XEN_UNPOPULATED_ALLOC [=y] && XEN [=y] && X86 [=y] > GEN Makefile > CC kernel/bounds.s > CALL /home/gross/korg/src/scripts/atomic/check-atomics.sh > UPD include/generated/bounds.h > CC arch/x86/kernel/asm-offsets.s > In file included from /home/gross/korg/src/include/linux/mmzone.h:19:0, > from /home/gross/korg/src/include/linux/gfp.h:6, > from /home/gross/korg/src/include/linux/slab.h:15, > from /home/gross/korg/src/include/linux/crypto.h:19, > from /home/gross/korg/src/arch/x86/kernel/asm-offsets.c:9: > /home/gross/korg/src/include/linux/page-flags-layout.h:95:2: error: #error > "Not enough bits in page flags" > #error "Not enough bits in page flags" > ^~~~~ > make[2]: *** [/home/gross/korg/src/scripts/Makefile.build:114: > arch/x86/kernel/asm-offsets.s] Error 1 > make[1]: *** [/home/gross/korg/src/Makefile:1175: prepare0] Error 2 > make[1]: Leaving directory '/home/gross/korg/x8632' > make: *** [Makefile:185: __sub-make] Error 2 Sorry for this. I've tested a 32bit build but I think it was before the last Kconfig changes. I'm a little unsure how to solve this, as ZONE_DEVICE doesn't select the required options for it to run, but rather depends on them to be available. You can trigger something similar on x86-64 by doing: $ make ARCH=x86_64 xen.config Using .config as base Merging ./kernel/configs/xen.config Merging ./arch/x86/configs/xen.config # # merged configuration written to .config (needs make) # scripts/kconfig/conf --olddefconfig Kconfig WARNING: unmet direct dependencies detected for ZONE_DEVICE Depends on [n]: MEMORY_HOTPLUG [=y] && MEMORY_HOTREMOVE [=n] && SPARSEMEM_VMEMMAP [=y] && ARCH_HAS_PTE_DEVMAP [=y] Selected by [y]: - XEN_UNPOPULATED_ALLOC [=y] && XEN [=y] && X86_64 [=y] # # configuration written to .config # I think the only solution is to have XEN_UNPOPULATED_ALLOC depend on ZONE_DEVICE rather than select it? Thanks, Roger. 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