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[2620:137:e000::1:20]) by mx.google.com with ESMTP id eo12-20020a056402530c00b004409963eb80si8238205edb.432.2022.08.15.22.40.23; Mon, 15 Aug 2022 22:40:49 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@amd.com header.s=selector1 header.b=y6RSvX9P; arc=pass (i=1 spf=pass spfdomain=amd.com dkim=pass dkdomain=amd.com dmarc=pass fromdomain=amd.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amd.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233414AbiHPF3V (ORCPT + 99 others); Tue, 16 Aug 2022 01:29:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229566AbiHPF3C (ORCPT ); Tue, 16 Aug 2022 01:29:02 -0400 Received: from NAM10-DM6-obe.outbound.protection.outlook.com (mail-dm6nam10on2062.outbound.protection.outlook.com [40.107.93.62]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99DC32ED5D; Mon, 15 Aug 2022 15:02:31 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=KIQKRwbSnBYj5biZ4gj/FhOnlyVNczVLFKiL/4YEVcEVyBH/BCjEp7msCz784/nr9V+WkRigo39i4cigkYoWfx7zZMjZ+Ue6CkQPawEz0NDa+04eRttvUNeFrnyKw1cY6EuGYCPu769mNrYNZ24d78wupNoWC/8eTwvEO9g6gtQD+HNlG6AoVi4qs+sqZlZUGDES5E119M0O+TbhRzgMfI6FRKAkh2qNLLXB8muxVIQAgfRuT1B/YR725fZdCBCpGY+CdodLpRWlpwqR9lR43f6LyFPgswpdWyHyMsG9USX373dLq1yFf82SBquPgAwsI3QmeMVq+nqJ2PEc+25lKw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=XJLz8swzKBEfv2hhBxl8KidCJGMyzlvyMsEkVwO45AU=; b=I9+wjI3WWo3k0HNns9DKdlxaCIAWhBnuBIZC+/GbVGxtamdChbEPA/QC9kHweHpBrU6dWtZFtid1QTtk4YQjxzHl9Dv+IGQEi6xVVXwqaQRcnFcTYrRMWwcUAwj51TgBc6Y6OL821B1uN5huTJB4++uYoVR0GrrZDd5XFCxdit7ia2EPGTShAw8PI5cpj1bjYzVmzo+OJhicPicwJcZCG3HR2i6AQ59o+cbY1Uj6tDjr9aI84V6+frMbO4ToVoVTa6b4IkUHr0PvzQ9KAFP3LHpc50Ug6QL9uA7cSfiJEcg5f/tluqv70Y5N+Ur7PwD9LHcfR3Lslw16ECIk8tKumQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=XJLz8swzKBEfv2hhBxl8KidCJGMyzlvyMsEkVwO45AU=; b=y6RSvX9PwSPG+tR/ph5fj/Awp/t2TgYXtvluXMRt0NThHo2zsnCrIp5pDK+m+XnMfR+gea1vaS0GEO5Zjt8zU8tfQWAZc11DRUBenYLMk+3WkD/Mjw66gnOlgyt3DnMWV8DpHUVL29p/pIWMN2NHBCTNeBBA7CTwJoPPOgXgtWo= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from DM4PR12MB5229.namprd12.prod.outlook.com (2603:10b6:5:398::12) by DM5PR12MB1675.namprd12.prod.outlook.com (2603:10b6:4:5::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5504.15; Mon, 15 Aug 2022 22:02:29 +0000 Received: from DM4PR12MB5229.namprd12.prod.outlook.com ([fe80::1dac:1301:78a3:c0d0]) by DM4PR12MB5229.namprd12.prod.outlook.com ([fe80::1dac:1301:78a3:c0d0%6]) with mapi id 15.20.5525.011; Mon, 15 Aug 2022 22:02:29 +0000 Message-ID: <2981e25e-9cda-518a-9750-b8694f2356b5@amd.com> Date: Mon, 15 Aug 2022 17:02:25 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: Re: [PATCHv7 02/14] mm: Add support for unaccepted memory Content-Language: en-US To: Dionna Amalie Glaze , Mel Gorman Cc: Vlastimil Babka , "Kirill A. Shutemov" , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel , Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Dario Faggioli , Dave Hansen , Mike Rapoport , David Hildenbrand , Marcelo Cerri , tim.gardner@canonical.com, Khalid ElMously , philip.cox@canonical.com, the arch/x86 maintainers , Linux Memory Management List , linux-coco@lists.linux.dev, linux-efi , LKML , Mike Rapoport References: <20220614120231.48165-1-kirill.shutemov@linux.intel.com> <20220614120231.48165-3-kirill.shutemov@linux.intel.com> <8cf143e7-2b62-1a1e-de84-e3dcc6c027a4@suse.cz> <20220810141959.ictqchz7josyd7pt@techsingularity.net> From: Tom Lendacky In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BL0PR01CA0017.prod.exchangelabs.com (2603:10b6:208:71::30) To DM4PR12MB5229.namprd12.prod.outlook.com (2603:10b6:5:398::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d76036e7-acf5-4f8a-b48c-08da7f09d8b5 X-MS-TrafficTypeDiagnostic: DM5PR12MB1675:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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It might take a long time but it could >> eventually generate bug reports about "unpredictable performance early >> in boot" that will be hard to track down unless accept_memory is observed >> using perf at the right time. Even when that does happen, there will need >> to be an option to turn it off if the unpredictable performance cannot >> be tolerated. Second, any benchmarking done early in boot is likely to >> be disrupted making the series a potential bisection magnet that masks a >> performance bug elsewhere in the merge window. > > I'm doing some boot performance tests now before I run some workload > memory acceptance latency tests. > Note that this testing is on AMD SEV-SNP, so this patch series on top > of the AMD guest patches v12, plus a > patch Brijesh Singh wrote to define __accept_memory for SEV-SNP > https://github.com/AMDESE/linux/commit/ecae2582666d50ce1e633975d703d2f904183ece Note that there is a bug in Brijesh's version of the patch and it will almost exclusively use the MSR protocol. Please try the version of the patch that I recently sent up based on the current unaccepted memory tree from Kirill. https://lore.kernel.org/lkml/cover.1660579062.git.thomas.lendacky@amd.com/ Thanks, Tom > > I was getting pretty consistent boot times, only going up slightly as > the memory size increased, but at 256GB, the VM crashes because it > touches some unaccepted memory without first accepting it. 255GB boots > fine. > > The stack track is in mm/page_alloc.c. I've done a little > investigation, but I can't account for why there's a hard cutoff of > correctness at 256GB > > [ 0.065563] RIP: 0010:memmap_init_range+0x108/0x173 > [ 0.066309] Code: 77 16 f6 42 10 02 74 10 48 03 42 08 48 c1 e8 0c > 48 89 c3 e9 3a ff ff ff 48 89 df 48 c1 e7 06 48 03 3d d9 a2 66 ff 48 > 8d 47 08 47 34 01 00 00 00 48 c7 47 38 00 00 00 00 c7 47 30 ff ff > ff ff > [ 0.069108] RSP: 0000:ffffffffad603dc8 EFLAGS: 00010082 ORIG_RAX: > 0000000000000404 > [ 0.070193] RAX: ffffdba740000048 RBX: 0000000000000001 RCX: 0000000000000000 > [ 0.071170] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffdba740000040 > [ 0.072224] RBP: 0000000000000000 R08: 0000000000001000 R09: 0000000000000000 > [ 0.073283] R10: 0000000000000001 R11: ffffffffad645c60 R12: 0000000000000000 > [ 0.074304] R13: 00000000000000a0 R14: 0000000000000000 R15: 0000000000000000 > [ 0.075285] FS: 0000000000000000(0000) GS:ffffffffadd6c000(0000) > knlGS:0000000000000000 > [ 0.076365] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 0.077194] CR2: ffffdba740000074 CR3: 0008001ee3a0c000 CR4: 00000000000606b0 > [ 0.078209] Call Trace: > [ 0.078524] > [ 0.078887] ? free_area_init+0x5c1/0x66c > [ 0.079417] ? zone_sizes_init+0x52/0x6c > [ 0.079934] ? setup_arch+0xa55/0xb6d > [ 0.080417] ? start_kernel+0x64/0x65a > [ 0.080897] ? secondary_startup_64_no_verify+0xd6/0xdb > [ 0.081620] > >> >> -- >> Mel Gorman >> SUSE Labs > > >