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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00BF0E80AB1 for ; Wed, 27 Sep 2023 14:25:35 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qlVT1-00088D-TY; Wed, 27 Sep 2023 10:24:43 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qlVT0-00087t-UO for qemu-devel@nongnu.org; Wed, 27 Sep 2023 10:24:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qlVSz-0004DG-1Z for qemu-devel@nongnu.org; Wed, 27 Sep 2023 10:24:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695824680; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uEV3RARKEJVMV8WdrWIeCRPMCdojUOSEeKIO0o8Dd3I=; b=G0Gyn+m5KMDfAlWreon+nZI+CMv6WFMT84k0Z/GYfCmjUL931xSjq7+7z6Pht0KGczDd2l LK/SzAmaSMkB6dvHuvuqkpxuCK5/cqG5cMdDyGZXjcGs2BsxfFO81212+yCDykZyc8/uJP QPsTPXAqTnmW/vh+NmWQ7p3iiwAkBlM= Received: from mail-io1-f72.google.com (mail-io1-f72.google.com [209.85.166.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-311-Ynfbt4pUNdmSpHriKo5n7g-1; Wed, 27 Sep 2023 10:24:38 -0400 X-MC-Unique: Ynfbt4pUNdmSpHriKo5n7g-1 Received: by mail-io1-f72.google.com with SMTP id ca18e2360f4ac-79fc1c4948aso1048789039f.1 for ; Wed, 27 Sep 2023 07:24:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695824677; x=1696429477; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=uEV3RARKEJVMV8WdrWIeCRPMCdojUOSEeKIO0o8Dd3I=; b=tus8C2S2QUQhZdRLw5H2dQxjAXS1m8ZnPnNdkX/ofqoAmBOO4glbJiFV7Os/O1MgY7 XejTdZJWo/SpFpmG7lUgEmRTdnGogme+yBIRoybDxAdbMu7P9v7v4QxsJjD88nLd/sdt /pJFJaKukiQsztlsONdlS5a7SYLr4ZPfOBCpUwzi2e76lTl5GjWOcMdgiHxvOienCXkw 6lwyFizsm1NoTTx8oLUjKJpxFY7auW8hXOzLRmvGOXB6U7x22BzytQdHS3Wq3uu15eQp 2O29nEwg0vXD+/ymMnZOGp2EerCeoGnzJURk5nEMNhVacjKPDxkiAvVDDuZ45OJDk75K ShnA== X-Gm-Message-State: AOJu0YytE6x4884sh8jSV1f0dk1n0ebREni1kd2/G0x/Vm0/W0tJvYEC 9jXaXLmsXUw2rj4C6A2OGvdfbP4eoDDT/52RfBhhpjYVgCFR3wmI9L9RdJ2sodtQWiVroqRCrhw MybPLQILN59fV7qk= X-Received: by 2002:a6b:f314:0:b0:792:82f8:749d with SMTP id m20-20020a6bf314000000b0079282f8749dmr2247502ioh.10.1695824677780; Wed, 27 Sep 2023 07:24:37 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGPjml2R3LeRZFda66cH4jRvgS4N5EzIVgRSuWbXFegmD4L/NYWKsd6m6QllzHfZ/h+N7Bp4A== X-Received: by 2002:a6b:f314:0:b0:792:82f8:749d with SMTP id m20-20020a6bf314000000b0079282f8749dmr2247482ioh.10.1695824677503; Wed, 27 Sep 2023 07:24:37 -0700 (PDT) Received: from redhat.com ([38.15.60.12]) by smtp.gmail.com with ESMTPSA id n16-20020a056638121000b00439c46ad69esm3840840jas.115.2023.09.27.07.24.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Sep 2023 07:24:36 -0700 (PDT) Date: Wed, 27 Sep 2023 08:24:34 -0600 From: Alex Williamson To: Jason Gunthorpe Cc: Jonathan Cameron , Ankit Agrawal , David Hildenbrand , =?UTF-8?B?Q8Op?= =?UTF-8?B?ZHJpYw==?= Le Goater , "shannon.zhaosl@gmail.com" , "peter.maydell@linaro.org" , "ani@anisinha.ca" , Aniket Agashe , Neo Jia , Kirti Wankhede , "Tarun Gupta (SW-GPU)" , Vikram Sethi , Andy Currid , "qemu-arm@nongnu.org" , "qemu-devel@nongnu.org" , Gavin Shan , ira.weiny@intel.com, navneet.singh@intel.com Subject: Re: [PATCH v1 0/4] vfio: report NUMA nodes for device memory Message-ID: <20230927082434.3583361c.alex.williamson@redhat.com> In-Reply-To: <20230927135336.GA339126@nvidia.com> References: <20230915084754.4b49d5c0.alex.williamson@redhat.com> <769b577a-65b0-dbfe-3e99-db57cea08529@redhat.com> <20230926131427.1e441670.alex.williamson@redhat.com> <20230927123318.00005aad@Huawei.com> <20230927135336.GA339126@nvidia.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.35; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=alex.williamson@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Wed, 27 Sep 2023 10:53:36 -0300 Jason Gunthorpe wrote: > On Wed, Sep 27, 2023 at 12:33:18PM +0100, Jonathan Cameron wrote: > > > CXL accelerators / GPUs etc are a different question but who has one > > of those anyway? :) > > That's exactly what I mean when I say CXL will need it too. I keep > describing this current Grace & Hopper as pre-CXL HW. You can easially > imagine draping CXL around it. CXL doesn't solve the problem that > motivates all this hackying - Linux can't dynamically create NUMA > nodes. Why is that and why aren't we pushing towards a solution of removing that barrier so that we don't require the machine topology to be configured to support this use case and guest OS limitations? Thanks, Alex