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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE51BC71155 for ; Fri, 20 Jun 2025 12:20:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 164586B0089; Fri, 20 Jun 2025 08:20:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 13C0E6B008A; Fri, 20 Jun 2025 08:20:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 02A6E6B0092; Fri, 20 Jun 2025 08:20:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id E44686B0089 for ; Fri, 20 Jun 2025 08:20:25 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 9E9518086E for ; Fri, 20 Jun 2025 12:20:25 +0000 (UTC) X-FDA: 83575686810.08.ABA7F33 Received: from NAM10-DM6-obe.outbound.protection.outlook.com (mail-dm6nam10on2059.outbound.protection.outlook.com [40.107.93.59]) by imf17.hostedemail.com (Postfix) with ESMTP id CF43840002 for ; Fri, 20 Jun 2025 12:20:22 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=TykdG6lx; spf=pass (imf17.hostedemail.com: domain of jgg@nvidia.com designates 40.107.93.59 as permitted sender) smtp.mailfrom=jgg@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1750422022; h=from:from:sender: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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=uFBGszDpx/Zh/wqLI/sYrP44o3WX48AwLw7oNwOYJ0Q=; b=nF+rnRrxG/naICeJkqoJL4eVC/S4v1eSzLAyHLNelaWgaqXEkiCWTlGvnGajalZ0qU5Zto T2Cds4i4pX8cBL6ciHpRIBaeIu8StPgkJMl3iDYSi2mmM5AnmyJpG+Zxv+/BeVaA3wAeqG J0td594I2/kGWcTy1+rXVvTFE92ZaE4= ARC-Authentication-Results: i=2; imf17.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=TykdG6lx; spf=pass (imf17.hostedemail.com: domain of jgg@nvidia.com designates 40.107.93.59 as permitted sender) smtp.mailfrom=jgg@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1750422022; a=rsa-sha256; cv=pass; b=rPubs4ozbOPeowX3ESSoQA28v0qgG+mPjZ1AK7zNRbrRwKBf+j+VyrOpXv1gBO7ZS+USQ3 Eeu1Yi9nwqKElq0A+xSfUQ9Fy1O13JWT712OiFcg0vKs6mv+UcWq/Ps6eb10bMoIHhGGAE GDzCN2JJo50dYQNZb4UnypSO/4CrDsc= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Dwnv2dGHSjbZSnstAS2qmL3ld6ct2ScfHxXaDLw2FQ5eTyRlepczYNxIcwIwQFhMDHwo+848Amg8zmjV5oHUpMHNtV3yfgA4tiG9zeILDPFcezo90LFEmGdpmVX2gCys7TOB9twmnHX+oSEKKfWCKJI6U6RWcRZBph9uS6KvvCnwTV3LjMKV824igwenipfV4YSW5NirNKoZlAat3LOWQNxE/BOljA33V/37tMfO+0J8bHZ6KlHHp77WT/7h0Hr6tl9zhOKkCSIPsgyF5CjQ8W0JK6fvKtpu67Qc2XzcaBPLRpqWT8cfEf0ibuHDXA73LmMTX1zbov2pffEuXARuKA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=uFBGszDpx/Zh/wqLI/sYrP44o3WX48AwLw7oNwOYJ0Q=; b=ubBh6YJK1v/DFUdar6U84gE1CUI6N38IYSJLtqpkQkjNPyDHY2xG2Ipacn6TRnbnY9LZW/ymV0fyHnKCVsltJ47BFNehTpVcAKM6y2huD6OaX++mM7GIfUCB0RJBSxQu1JfNlY0yO7lKLsJGgNzvGW97+cSw4M/5vuQZGuUV+zSBZzS4CJDKeCo/Lk4ZXp9iJOFObeJklsygGimmL1dOJYNOzHhrfdBTg320xg1eCymByOVxxZDnJNKpiDr6tOelJZ+1xDQXcWEIIBl8dXubNAZar2LCqWz78m/ztUOVOcPqraqWHiv5vcT3F3KEjsvTJyL6cC+lrBh4XN5mIe+62g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=uFBGszDpx/Zh/wqLI/sYrP44o3WX48AwLw7oNwOYJ0Q=; b=TykdG6lxKP31CRYlO0VtXFzuplpCcd/kkNLhvPrupLuQ88cAbaJrQ+lzzHGLIG51qAJ6K8UbU9QqZaTRQOSttAuHbxN+dRKdrizQvgeIqmDP7Q7zgBRlOybJ+uvcEcSKZzdWUc2NgzNl3DpcuQP4QBDW7yAT8wAhmBWIViG4j+GErNiUtbLMQaqjPjc15KkOK0hUWqqXyyCC4dHf79Ci/TVjC826l/hxzYCz3pwX0UVorbRb5MKrLATQWGpCHfhbqEeuo1aVWknE2+ncfQfleeSvNiL8eXO4dZkTMexuioUt7f2oaEofo8FTsTRtPlGVA+IRxwE3QRra8eQmvJDYnw== Received: from CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) by DS2PR12MB9709.namprd12.prod.outlook.com (2603:10b6:8:276::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8835.29; Fri, 20 Jun 2025 12:20:18 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%7]) with mapi id 15.20.8835.027; Fri, 20 Jun 2025 12:20:18 +0000 Date: Fri, 20 Jun 2025 09:20:16 -0300 From: Jason Gunthorpe To: ankita@nvidia.com Cc: maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com, shahuang@redhat.com, lpieralisi@kernel.org, david@redhat.com, ddutile@redhat.com, seanjc@google.com, aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com, kjaju@nvidia.com, targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com, zhiw@nvidia.com, mochs@nvidia.com, udhoke@nvidia.com, dnigam@nvidia.com, alex.williamson@redhat.com, sebastianene@google.com, coltonlewis@google.com, kevin.tian@intel.com, yi.l.liu@intel.com, ardb@kernel.org, akpm@linux-foundation.org, gshan@redhat.com, linux-mm@kvack.org, tabba@google.com, qperret@google.com, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, maobibo@loongson.cn Subject: Re: [PATCH v8 5/6] KVM: arm64: Allow cacheable stage 2 mapping using VMA flags Message-ID: <20250620122016.GD17127@nvidia.com> References: <20250620120946.2991-1-ankita@nvidia.com> <20250620120946.2991-6-ankita@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250620120946.2991-6-ankita@nvidia.com> X-ClientProxiedBy: YT4PR01CA0444.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:10d::26) To CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB8659:EE_|DS2PR12MB9709:EE_ X-MS-Office365-Filtering-Correlation-Id: 5b784986-6386-4183-ec3a-08ddaff4d1ab X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?TTIotCSK5qHQJojBOmeraIiaISTlRB+l03aA8vvUYVGWXL/EyLCRVsqrgON8?= =?us-ascii?Q?Fu5CiWqmuON8oedtqo0ekYaxExGia/rruIqszYtEhPUfZtQA7bu1TjB7q5+k?= =?us-ascii?Q?X01xNJN6hRYVLSAdhCwdF4KG8EnVv8kXKDWxwkRV59wdA+3J6mDPUiQ0RsQ7?= =?us-ascii?Q?+0ePekLvgeX1et+16rMYiTBMWvsHJvJfNLlP4lUeD16m+4IhZzBnAYuzSeuU?= =?us-ascii?Q?Va3yWMdmJeMHTDPxfG5ZXZiyNYUR7QHVzqk44xuyivdPf5QW94gjN9CttvyE?= =?us-ascii?Q?nPSKow/WfKW49JVq5etMza8Z9Bs/1reRhcP4xWMc25rZ50tsk6Sk1NsOysJa?= =?us-ascii?Q?Jg7RRE0EYu2e3pGZfJzPlYD5IpTx90tFcv9mcBCb03XVdB06Iiwv7e2HxJ/+?= =?us-ascii?Q?vsBLwnEwZ/4s4H1JKSLN6li6jPBpIcrThynmIAs6dEc6R/Gh40evjkJzWMXV?= =?us-ascii?Q?dqwDORLzropASKfr0Fms4TC+WH45ECJIf5v0TUUxBEct60tSYwrcq5OJ7zL1?= =?us-ascii?Q?hEzeT0yVhXiCkd07nSp8Y6wdBzRkyzd+CQodzkHWSoAmtjxD4+iHJRiTbJB/?= =?us-ascii?Q?M9lRS5LtPvl9G9p/1t3SzuhwstELzpFGzqzQnQFjRwnoLALozUdOlG8t0LLg?= =?us-ascii?Q?FITWJWFt/ZkedYSRZVlaO56hsQ7UK7jRJVmix99Kmq9AXtgi0WH/zHJjTqTu?= =?us-ascii?Q?HuXZAB9ppid2NzinOzWLFU1nSD3s5kSkvMgooawm+KuEmfPpRie0P9I776Ku?= =?us-ascii?Q?oCnbOm+zuM3utbyGE3j5sBb8IuSNuChCgNp2bJWyITHnXEpJFd3XXCXbHNCE?= =?us-ascii?Q?/ThkyBKhhaSu5U60DtwYkbpc0rrNRx/uYKoAF4qiqyReTQY7+ZCJQ4ArmTeB?= =?us-ascii?Q?lkHU8RUOzF+QUTodjfGSgcUQujhd8Ld2oOygTVCpfYgspw9/xI4llaaInmDB?= =?us-ascii?Q?xVC0WpUUKP3wvW9fvwspljxOplWRDWUHEpbg/d6ZOSdxPeXOPosuCxK9KCC5?= =?us-ascii?Q?Mc9hxwGC+vShUm3a+SgSXUX1cLN4XiPfrJ+PWrvAHNbv8OwMy4WPhzbCzpGJ?= =?us-ascii?Q?9vmP/XVyi5cfFJAQ9ShoFiV4Ne33HvsS7zs+60pWaGFtjeVcq5AMQsrc7X0z?= =?us-ascii?Q?H6G4XyaM89NN/sLlLpoidFZEiYb1ZCFRXHdxGOXLwdMxVwvTO2PArFcMYUg0?= =?us-ascii?Q?JpEknL/DXltSMpUNkVSbqXG2Ks5++cmv6M4om4B3jgPpBlJIUuJ1xKZGDVWO?= =?us-ascii?Q?CpalQRcyP7PokAVoXaD0v9kLyOwQ0VyEQxVpGm5a9DazRvnWWzFSSsa3IMw0?= =?us-ascii?Q?b6b5hKOWGh12ViG0E8vbVmu5TAKQK4ra2hN7Xvs7y/MoFWTDMqGiw659YXtl?= =?us-ascii?Q?C4mmPAQ6QrmnSfRF7pAaM4/pnTmb/+VK0LEEMf4QePw+jmXSaUJ+3pDXOn78?= =?us-ascii?Q?caFcmg9cHSw=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH3PR12MB8659.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(366016)(1800799024)(7416014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?4+iZ59Ccw112MCylYbdN4rFsxD8eAoQ7dYjMZrYoWz6mmZ7f+nGPGUErJwaN?= =?us-ascii?Q?jlOZHpdTrFXAOFwZYLRlWJQcQSFuR0WOxLzFuwPy1lof4THSRLGXWALsmMFH?= =?us-ascii?Q?QFIt5PClcQecVl2vKL9nj+29dQWYRBCRBQgrK49gVgwMhpsdLZ+0CE0ihcmR?= =?us-ascii?Q?bCbcYNfyymkjBDUc0JawYLp9xfI/Z4pY/18jI6kwcPjKaFpLpAoDDJByzJuY?= =?us-ascii?Q?Fx4f3i02e124iD2rtJpGFXoU2MDrsitu9IrJBcexdXZ1R6Gc/EIwitVZhyWi?= =?us-ascii?Q?HKNQ4Wy5qIYDXfTgpPsgpVwzZzd+SEVCtKfDJPRksJ5Xg5N+9YDgH0DJ38Dw?= =?us-ascii?Q?4yCkUhd9eyWYfGq7NIwiunqiXxsKe6lnplB+Vya45ZdSvCyxNHj6ANMiQ50f?= =?us-ascii?Q?LQ4KcZIxlndrVzsse/LMOc5nR1BY2f3/cskyXmfQUzMD78gS1EGBcDMwjv3u?= =?us-ascii?Q?VGKm/GXD1dW1kHS16Q7tDOg8To8pP/0goVaD2z6ph1jiUbeMdw1YSX0dMII8?= =?us-ascii?Q?MaIic30FUrORBaRMHBCPnsZRazl4jFXy+WJA4gmZFOsB4NOn+MQugm1hSdcV?= =?us-ascii?Q?7c1qvI8lrsfy+/1gKdYsu1XFfWPrihXHd2FTxV0hrAKBL8hblV/HztbmUgBz?= =?us-ascii?Q?RI+U+XPYm4xVSghQ+P7CyA4fycGqH1ExTh+7zzGKxOb0Hi9btwKJNElxs10Y?= =?us-ascii?Q?f1ZwJZXCOr3VJlOU6JnhK/vdElrY69ta1+YMn2QaIAG9LDdTpTUzUJHkJCpT?= =?us-ascii?Q?rfwHdujPgDo+KsSk73pWZ4+SNyG0qbnQJPhZqmS7BmvE6/2rmjKQ8oYBYHa7?= =?us-ascii?Q?d8C5x8oY8NdY6AyyKAjRlUIJelljTQhsuDAuTxbrLrqXZDAJG4rBJ4GQq+/O?= =?us-ascii?Q?AID7ajz6lLboaLZl6CXFRZ6OV2l/B6fk9i+CF/0r4MVmeukk4u2OIjwjGU55?= =?us-ascii?Q?GoR0W2WnI0n5Efh+Lh/2PhA11495Levdxq5cjqfvXAzdMX2gAs5aUBaoij+L?= =?us-ascii?Q?SymrkbbFSPf/Ufk5wq5+gmGth0yo5h+d5dL3g/3Fv+Twkx/uPL5LvZ3Yy5Z+?= =?us-ascii?Q?icH4vq/bvZijnll+IJS//9DYpgdSghjcoHoX3vOD+TNXE1WaVZAvv0LL+bna?= =?us-ascii?Q?c1HYtQYRb1mwSaEEf68tgGVKIMXXYk/wbtO2MMGQWCQ10C8QeYKUx52NCRZY?= =?us-ascii?Q?NxygNNnDAOD3v6TueOWMktkLiu0aCYEpwy1Onte+ljD+jeQ02Ty3cQEIUtCS?= =?us-ascii?Q?9+xakaDnIK1OSNToUgOPGZ+uG0PHUWdnFBrhWcfQFbhzw2C+F6wXYMxos8G2?= =?us-ascii?Q?CwbXEBMXIUDXLV0jLduMm9llCd1+QRcf+YYe/g7gNh+jGAEEAzoUVzpMBdNP?= =?us-ascii?Q?mvT87m2pE91eHnV7oIsZNIJxfmx4IfIVI4lucGG00R0KUyFCj+cPF5WIl99K?= =?us-ascii?Q?o/rK7DWKJJOgqouC0Yf43RpsRvg7QNRCnmr3TaGM1PHt/10q2vevsZU14ngu?= =?us-ascii?Q?6e4dYMGUDrBmFcqxM+ChUNsWajx/d1JszopflcpbfnE64wHF2Ozfuz0AoK3s?= =?us-ascii?Q?NvnIV277YqW4J4O7rPpQeGwPfVRln4PVa1aWuzn1?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5b784986-6386-4183-ec3a-08ddaff4d1ab X-MS-Exchange-CrossTenant-AuthSource: CH3PR12MB8659.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2025 12:20:18.5216 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: hTW8o2eVUC8hn/iQNpJiOw0Al8ce2nKl0NflNHTEUoaUa2zmCultsM1yg/pDfh3v X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS2PR12MB9709 X-Rspam-User: X-Rspamd-Queue-Id: CF43840002 X-Rspamd-Server: rspam01 X-Stat-Signature: muehgzgk1m5inw6un3ak4zx1nnyfqjeb X-HE-Tag: 1750422022-587021 X-HE-Meta: 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 /GcwFF/n DQ4ZJRYG1p4q1YDhoLUVZuJh07XKFnlJsVPcGQ5yzS2qXwq620qPpD/hLBW6B+xZHzFQViLVqFbzTvrEJXJEGxkXgNRBnddsw3gMgyBlpumKuTH2ZvH1FpsDczSSf46cPC3Dqvq73T3R2RRnrkLodUrerkvuDsyttG/CYqd78BE8PRGO5K96iSovHb5oz+AECiGtuIeS9U8zN4XRUWHBndasDdH71kmPjAS7VQaTmm5aXKv+I1r6Oht2MxQ5WM3LRJGqhBKtsx+VsMyD776dwxAYgrM1F3RcD3tI1e9jDsB7V0wmo7IXFbM1+Wvifhinx2Su812/nyrSoe2Z0CcFcIltkghQXAezZgMum2JbrKtmWDQh5KWpQjCUcKdtvE3OJYrcBKaiC8X06O8HUpd65QlhnqJ2jWGqyLLxl8vFanEOzumemTLSsA5wG8piZNq/fGN/GcibqAhfvD3Ct7mTv/b/e6+96o8cVRwDn 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: List-Subscribe: List-Unsubscribe: On Fri, Jun 20, 2025 at 12:09:45PM +0000, ankita@nvidia.com wrote: > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > index d8d2eb8a409e..48a5402706c3 100644 > --- a/arch/arm64/kvm/mmu.c > +++ b/arch/arm64/kvm/mmu.c > @@ -1683,16 +1683,62 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, > > if (vm_flags & (VM_PFNMAP | VM_MIXEDMAP) && !pfn_is_map_memory(pfn)) { > /* > - * If the page was identified as device early by looking at > - * the VMA flags, vma_pagesize is already representing the > - * largest quantity we can map. If instead it was mapped > - * via __kvm_faultin_pfn(), vma_pagesize is set to PAGE_SIZE > - * and must not be upgraded. > - * > - * In both cases, we don't let transparent_hugepage_adjust() > - * change things at the last minute. > + * This is non-struct page memory PFN, and cannot support > + * CMOs. It could potentially be unsafe to access as cachable. > */ > - s2_force_noncacheable = true; > + bool cacheable_pfnmap = false; > + > + if (vm_flags & VM_PFNMAP) { I think this same logic works equally well for MIXEDMAP. A cachable MIXEDMAP should follow the same rules for PFNMAP for the non-normal pages within it. IOW, just remove this if, it was already done above. > + /* > + * COW VM_PFNMAP is possible when doing a MAP_PRIVATE > + * /dev/mem mapping on systems that allow such mapping. > + * Reject such case. > + */ This is where a COW mapping come from, but it doesn't explain why KVM has a problem here? > + if (is_cow_mapping(vm_flags)) > + return -EINVAL; > + > + /* > + * Check if the VMA owner considers the physical address > + * safe to be mapped cacheable. > + */ > + if (is_vma_cacheable) > + cacheable_pfnmap = true; > + } > + > + if (cacheable_pfnmap) { If the vm_flags test is removed then this is just is_vma_cacheable > + /* > + * Whilst the VMA owner expects cacheable mapping to this > + * PFN, hardware also has to support the FWB and CACHE DIC > + * features. > + * > + * ARM64 KVM relies on kernel VA mapping to the PFN to > + * perform cache maintenance as the CMO instructions work on > + * virtual addresses. VM_PFNMAP region are not necessarily > + * mapped to a KVA and hence the presence of hardware features > + * S2FWB and CACHE DIC is mandatory for cache maintenance. "are mandatory to avoid any cache maintenance" Jason