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=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,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 905CBC433FE for ; Thu, 23 Sep 2021 20:44:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2BFB461211 for ; Thu, 23 Sep 2021 20:44:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2BFB461211 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amd.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id B691E6B0071; Thu, 23 Sep 2021 16:44:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B192E900002; Thu, 23 Sep 2021 16:44:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 96C916B0073; Thu, 23 Sep 2021 16:44:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0114.hostedemail.com [216.40.44.114]) by kanga.kvack.org (Postfix) with ESMTP id 865F16B0071 for ; Thu, 23 Sep 2021 16:44:35 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 320E28249980 for ; Thu, 23 Sep 2021 20:44:35 +0000 (UTC) X-FDA: 78620016510.01.C895219 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2072.outbound.protection.outlook.com [40.107.94.72]) by imf16.hostedemail.com (Postfix) with ESMTP id A1AFCF00008C for ; Thu, 23 Sep 2021 20:44:34 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=CEm9D7tDcB5GUgYJd1fYjJwg7FtDE9GMlewMASv/BnaN83jCzTsRnFPMOT/JovPgXAMv0dED5XsqON55OljAgj1jIB3DYCR1pSNBEy4nuPvU1mli/n+iQu3w1tnPl5/5CmoEeypIPl2XowH3qrrMomFTUEFC4IrLGDnoeGfMLOMBD33/LV9/swxrNqvq3kgGhvL0Q54eWOorQU2cf9LhNYgjvo3b3QlWj1fp3KWl+dcLAh6lelXsgt73nyOYmAUifeiivY+y9glLAuWp5tWYxYiWaPeaZCMcNNvEOXFzFaw4MyL7ml3AzDmvxKwEfjSU4vGFUe7wmcP57j+1tYZd4w== 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; bh=xqgKJ2XSJxqhMiPcgCpS7n/zTcUc3NJvDQCQTNuoKG0=; b=Jcp383MKi6eSO96M9AMsLt7onl+jnPhrrhOjzmUZgX4GgVh0LWtmw5FJjP3yv3cQGRFNRUq2ud0Z9ppCNfLqVNqL/Zi4tQfoZWGr1b2AqYrORthzkil2/LUtpg3jPTQdfMZKyNgJRLXuadtSlCtuVxFh3HmCYc9RARAMe4XlIqKbFm185jMg7y4XEvE4EWlk5E+yCr+aFK7OrNbXMLNbC4rKceWJVXnjWJ2XAdRI+uiI1u+6GUMD+ruse3LeMdfNPZmX5QbX61T3XdjzARm4o8BRi/7ikF/itX3J5lYLOsYsc4fGGslk+m6DphOYRCQdWFdpU2mLJn/vg+NwX44k+g== 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=xqgKJ2XSJxqhMiPcgCpS7n/zTcUc3NJvDQCQTNuoKG0=; b=JHyWk9p8Lr+9Xbk7XSYDUXmuMtMF4hR1gASLlNs/hD/Lto2/b8QJPLSslcwse4bLmzDcpgYiht7dujmZ6vOAYWK7EPRFNeMUuWs6aux5jkYS3LxpJWR4Cr7dmTEZKiQ40VXnpFngiR34rQ6PwKTdr7evfitDXKfd035DIxIINZE= Received: from SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) by SA0PR12MB4509.namprd12.prod.outlook.com (2603:10b6:806:9e::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4544.14; Thu, 23 Sep 2021 20:44:31 +0000 Received: from SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::78b7:7336:d363:9be3]) by SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::78b7:7336:d363:9be3%6]) with mapi id 15.20.4523.022; Thu, 23 Sep 2021 20:44:31 +0000 Subject: Re: [PATCH Part2 v5 21/45] KVM: SVM: Make AVIC backing, VMSA and VMCB memory allocation SNP safe To: Marc Orr Cc: "Dr. David Alan Gilbert" , x86 , LKML , kvm list , linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com References: <20210820155918.7518-1-brijesh.singh@amd.com> <20210820155918.7518-22-brijesh.singh@amd.com> From: Brijesh Singh Message-ID: <9f89fce8-421a-2219-91d0-73147aca4689@amd.com> Date: Thu, 23 Sep 2021 15:44:28 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-ClientProxiedBy: SN4PR0501CA0001.namprd05.prod.outlook.com (2603:10b6:803:40::14) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 Received: from Brijeshs-MacBook-Pro.local (70.112.153.56) by SN4PR0501CA0001.namprd05.prod.outlook.com (2603:10b6:803:40::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.7 via Frontend Transport; Thu, 23 Sep 2021 20:44:29 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b88850f9-9331-43ce-3789-08d97ed2f170 X-MS-TrafficTypeDiagnostic: SA0PR12MB4509: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR12MB2718.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(2906002)(966005)(5660300002)(66556008)(6916009)(6512007)(508600001)(66476007)(7406005)(66946007)(38350700002)(38100700002)(83380400001)(316002)(7416002)(54906003)(8676002)(26005)(44832011)(52116002)(31686004)(36756003)(31696002)(4744005)(4326008)(8936002)(86362001)(956004)(53546011)(6486002)(6506007)(186003)(2616005)(45980500001)(43740500002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bkZjb0VHUis1NUhzM3B6Ri9DcmYrV2J5QzRXOVkzdk1IWm4veXg4UWVMeHB5?= =?utf-8?B?Wi9zSGllbGExY05DT3lBWjNDSGpjMWNrOEFHWXd5S2xjQmM3dXYyYUlvNXpK?= =?utf-8?B?L2pqbXFUdkhmV3JTc25DUnFvNFRVME0yc3ZoNHAwWDkrOStpVFMvNUlhb2g3?= =?utf-8?B?ZWY2UXhNTlpqZEYrZFRCTm1yaXBFWmtjWUFWd3BVc05qcnladXZ1SlBVaTg0?= =?utf-8?B?SGxKTThZb1lHM09CbXQyRUYvWS91UXp6dG1zalV2c1RKbGxWK2NmNHhFcHpO?= =?utf-8?B?QkZsNjJPVlMxR3NxRDcrcUFDVEhXOG5OZEtEYlR2MmJlaGM2V3lHa3Vjd0o5?= =?utf-8?B?OVZwT0tSRklFdGtrL2crU3V2b3lUVVhCcHI1bW5oUTlJUU9LQ3g0OHNtU3dP?= =?utf-8?B?a05HMnZiSlhkN3ZrM3dIb2FQVnFpRkxkdFZ2NllReVBVeXVTSVpvT1V6NGUx?= =?utf-8?B?S1p3RkFORlNkWmlRbmpYWkdWZW5kME91Z2srRVB0OTlZTjFJZVpRUXducUlm?= =?utf-8?B?MjNEeWxFckJzVytVVjNhcmtQeWlQckg3dzNaaGJxZ016cEh0MkF1dlFLYjVD?= =?utf-8?B?TlRuSnBWL2NZTTc0eGlJUEJNMW54a3Z5TnJDTXhrKzBPRVZrSnplVCtaTWRR?= =?utf-8?B?Y3ZHRE8yeUhUUm5MRm8vZHBUWGFTR3dRY3FWOXZKdFk3QnVxMjROUFIrd0tj?= =?utf-8?B?VlR3NlNFU21uelZqYS9sNTE2UGErUHhxM1JyYnNhdE5SUWtobkRGazhMekpX?= =?utf-8?B?M2RlUzI1WkNEbXlva3dnenhoTEM5cjNkRk1YM1czTGdIU0laY2wyYks5VUVR?= =?utf-8?B?NWw5NmlLcjhWYkNybEZqZGtEaDFoVnd0VE04K252dmM2eFB6eFIzRGlwTlNl?= =?utf-8?B?dFFabHYwTUYzaW41UGtZL3VRbGZMVitsSkp0QllaQzJHdWx1QkoxaXA1ZzU1?= =?utf-8?B?dWdyRG9MOTNTY202SVJnc1ZHQ29KWVMyanVWZjQ3cmhzNWxUWHFDU1hSMUY2?= =?utf-8?B?LzdTYVdmY2E3ZGNiK1BOclB0Y0NBK1BZNVU3M0d3QzB0eWNtQWZza3pIeWVE?= =?utf-8?B?WUFYajZCZThFbkxaeU1uTjhXMmVkL2NYa2Y4M3RGdFdYOWhEZE93VCszMVd2?= =?utf-8?B?V2VvKzZ3WUorM053UlluaDdKMGl2UklIU29IWTFvNUhvRXRHb3RxOGhtSUN4?= =?utf-8?B?dEVIT0JvSkpUTlhwY2RVdDRYODhEalp3ZWJkaEpDZW5TdjFoOEw1WkI3bGlX?= =?utf-8?B?WGdYVTZ5ZVhpYUlHcDVRc2ZaanEwTUNpVnBzdmhrYzNPOHZjSkcrcWhGeDJV?= =?utf-8?B?M2I3czNremh6cTIzaVJWd1ZHQzM2WGRsNmhBd3dBdW9CazR3S243dVpXbFEw?= =?utf-8?B?N3JGdXF1dVRPZFlZc1JJSStteTNNZ3huWlhYWXRwb2M4YnE3NVJqOTIwNDRY?= =?utf-8?B?SUZhaDFiSWFsbWhyeGw4MXdtUjE1V2xDSjlPM0VJME95NTFRdDJjMzVGRjJK?= =?utf-8?B?RUpOQjhtQ05wNjRWVmdxZCt0VEpPMTJZYzduV1VvdUFQZUZyT2RWSkRocGFN?= =?utf-8?B?eUVGdXhzRHJPWDlYVWdLZlFjY29ZcnJRN2dEeWFYRUJWWjVaZldMMXkvenVQ?= =?utf-8?B?aXB5Z2M3b2I5ZGYzSExSMWZFNDFmMFEyN2I0bDRFRUx5bmE2ZzlFNTh6czc3?= =?utf-8?B?ZWpNanlVajVDNTlsUGxVQXh6V2tpZm9ZekNYU0ZEY3A0a0hFRWx4VHZiVGVP?= =?utf-8?Q?I+YmHeZw8FQ97sdg9EbNSw2FT9Vs68Zx0EyCj6+?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: b88850f9-9331-43ce-3789-08d97ed2f170 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2021 20:44:31.2218 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fi+D/f7ObtP0zzzefi/6/+fmqp/wVNN18a1FHT/+l3qtDYztwET+5SG4VQqcC/jkmw7n1U3QUMlaxQEJbNXMGg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4509 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: A1AFCF00008C X-Stat-Signature: i4z6sshx7bs8wrwtou7unzq8uhcnatz7 Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=JHyWk9p8; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf16.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.94.72 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-HE-Tag: 1632429874-733890 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9/23/21 2:17 PM, Marc Orr wrote: >>>> + >>>> +struct page *snp_safe_alloc_page(struct kvm_vcpu *vcpu) >>>> +{ >>>> + unsigned long pfn; >>>> + struct page *p; >>>> + >>>> + if (!cpu_feature_enabled(X86_FEATURE_SEV_SNP)) >>>> + return alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); > Continuing my other comment, above: if we introduce a > `snp_globally_enabled` var, we could use that here, rather than > `cpu_feature_enabled(X86_FEATURE_SEV_SNP)`. Maybe I am missing something, what is wrong with cpu_feature_enabled(...) check ? It's same as creating a global variable. The feature enabled bit is not set if the said is not enabled.=C2=A0 See the patch #3 [1] in this series. [1] https://lore.kernel.org/linux-mm/YUN+L0dlFMbC3bd4@zn.tnic/T/#m2ac1242b33a= bfcd0d9fb22a89f4c103eacf67ea7 thanks