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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 82921C5DF8C for ; Sat, 22 Aug 2026 18:53:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:CC:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=7hba9RoTboIDRn+/gDOcX6XqGj+80E3/Waic+hVLIoI=; b=vMEYrVmeHXhC9qiDvkTwQDDE+p WsS86EbxE96eSv9K8TpEZfFjK2eOvGGdYUfmsXpIKahXJ9mRGZKhFt8PePqHL4g02B5bW/23Ppov1 Vgpq99J5eIuWJ43bZVW0QcrE2VFb9cl6EOthNXSH/iGwdMNCqVViBVD+PXXXovXMfNelIUVF+A3H5 QnJpFibc+/PGP5Zj922me4sXbWHTdpEzBN3zyCIEBZyTRfpx/QRgy3Zwj5w8i8Js+T0g4X6cl6jrt 60eN4RsZgXabqNiBcuuN3LKAhilR1PUUhRbNuQUUpfQeBUPdbJ1d1Y95tFhIN7C+MlmeiVt2ElElF LUrL/fgA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxqpz-0000000EjA2-3d5a; Sat, 22 Aug 2026 18:53:03 +0000 Received: from mail-westusazon11012025.outbound.protection.outlook.com ([52.101.43.25] helo=SJ2PR03CU001.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxqpx-0000000Ej9i-1kPC for linux-arm-kernel@lists.infradead.org; Sat, 22 Aug 2026 18:53:02 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=TdYACbOhlRg1S23rVGpV/LfvH1DfxW7Vqgyr4MykC5Hu5FWKf6I3UvTyulwE4i+poKZcBOX5tOvBUvZ6Ie+mJMimFvyemrusBLmoXc56XicEN/RVyPvsUNQ0Jf45ZpXE6Wd0poay/mnTRtHgqhaWopn6vKZR0eY6CUZVXBuFM7KDetuLZys8DhmcmmXIkehj/17tK30WZbQ/2xgAF7m3uZfTwyMRnlwuKTY4n0JUw6tG3NszwL6J6gDZ1Wk2jilJFxACo+JTQzcV/ZogI0T9oCyyZuNKK7LRL6i6QfViCM86WmelPiZPVyhzODaPbHh09FT9XPMzDJbGrWfr2gMGOg== 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=7hba9RoTboIDRn+/gDOcX6XqGj+80E3/Waic+hVLIoI=; b=fGdwQt/fOMmEx5vdMchf/JhR4PNTUi6LiuuZhod+yvprif88lD8Fw795qTrTxrZRXhac0lSDIncAImoDcC0P6YVi2G/zjvtl9+88PojKUpcG3tzhgDkPQxEi/sPem9FQR9bzyr8kOCnHULtEi4wKXFGdjzHZdbowgh53Dy5TcWZJhAJzbE2MkQNg4tsawuj54F0kX3xonCY8RBYoQGwhayq3kYnsOraaGkIK/ElpePlfUl8r8YDiJJxPTTKz6tqSsilZuVZlar4R8k9KtERaBIfQf4Z37YsFrLZMh3W1Uo73LB9rnE2Vj1j7a3SUs0/Fmi7dYeySQjQTz+210NZ8jA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.160) smtp.rcpttodomain=kernel.org smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) 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=7hba9RoTboIDRn+/gDOcX6XqGj+80E3/Waic+hVLIoI=; b=iHIlcXq06+QNXcqLM6YDed1qmXtO83N7f32EUhYX34Q7xFAqMICLcERXGcbMGwtMZX01MfFtIsN402iiIYuT1pCkYPyUnIjYg+mATOMMF1ebiQVj5TUG/TBnEU5BiQvJDh+VWsMzE9eb37gV9DN/6+GkkOlA03qqD5BPnJACsrPb7zz9VNcxIFltikM79nL7K8vyzJxPw7EBxsEKc3WkdawaszA1t1lbYm6oF04DWyG6bmQ2CUTxv3InMBVcdg5JoCTV1WZWzLmQY9i/yw7Lay/oaWCC1Ybf7IjcCCRNfFcXTxLpMyJ50xVoImDnKFiFP/J7wHPUQgLoZLRSWzohiA== Received: from BN9PR03CA0299.namprd03.prod.outlook.com (2603:10b6:408:f5::34) by DM4PR12MB8569.namprd12.prod.outlook.com (2603:10b6:8:18a::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.339.11; Sat, 22 Aug 2026 18:52:14 +0000 Received: from BL6PEPF00020E60.namprd04.prod.outlook.com (2603:10b6:408:f5:cafe::1e) by BN9PR03CA0299.outlook.office365.com (2603:10b6:408:f5::34) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.339.11 via Frontend Transport; Sat, 22 Aug 2026 18:52:14 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.160) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by BL6PEPF00020E60.mail.protection.outlook.com (10.167.249.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.360.3 via Frontend Transport; Sat, 22 Aug 2026 18:52:14 +0000 Received: from rnnvmail202.nvidia.com (10.129.68.7) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.46; Sat, 22 Aug 2026 11:52:03 -0700 Received: from rnnvmail203.nvidia.com (10.129.68.9) by rnnvmail202.nvidia.com (10.129.68.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.46; Sat, 22 Aug 2026 11:52:02 -0700 Received: from nvidia.com (10.127.8.10) by mail.nvidia.com (10.129.68.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.46 via Frontend Transport; Sat, 22 Aug 2026 11:52:00 -0700 Date: Sat, 22 Aug 2026 11:51:58 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , Subject: Re: [PATCH v9 07/12] iommu/arm-smmu-v3-kexec: Add ASID/VMID reservation helpers Message-ID: References: <9f9d227c0adf472e93293008e7083973688d015e.1784663184.git.nicolinc@nvidia.com> <178735412602.18212.13622444378152698190.b4-review@b4> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <178735412602.18212.13622444378152698190.b4-review@b4> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00020E60:EE_|DM4PR12MB8569:EE_ X-MS-Office365-Filtering-Correlation-Id: 3f989634-c4f4-4934-4146-08df007e7b32 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|82310400026|1800799024|36860700016|376014|10067099003|56012099006|22082099003|18002099003|4143699003|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(23010399003)(82310400026)(1800799024)(36860700016)(376014)(10067099003)(56012099006)(22082099003)(18002099003)(4143699003)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: SKBVxS9k4KEwCT9evlvtOYVUGfiwdLQLN0Td4ZUB+8MaW+zQ2TD5pWsTjLQSoBXihKOI40Gn6hBK4b36D7K3dihxkDIgK39koiIRr3Tnlm14m98Agw2flPfkWL5NovIcX3EGoOxBC83mC6kCRJSwF7wocq8BeiZsiTLG75uvILdNLwxjvCZhYyMbgc/i5uh0H+3WWV8AUXCe0yXU03NRbdpoxyHYk4/PAhIQZralsxLqU2oN5www2vboXmWcdc47ThzNLIcRtehRWLYzzx+JQzf2TJAXkZRZvHIyQ0NSaRHSM8kXJEqW4KuxInlXv/Rnmm/0Lpc3W9xIV4uqAa2JL6CBV6DK5hFvUafanvXDXKA1Bv9eDxedHHaiWPkAfvmww9325gZx3EXXiuizNRELaHTLp+tx6HwPXy90tO4v9FwC06fhxxDpc53oQte4MLDS X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2026 18:52:14.0776 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3f989634-c4f4-4934-4146-08df007e7b32 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF00020E60.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB8569 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260822_115301_465933_60C8572B X-CRM114-Status: UNSURE ( 9.40 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Aug 21, 2026 at 08:15:26PM -0300, Jason Gunthorpe wrote: > > +/** > > + * arm_smmu_kexec_unresv_ids() - Roll back a failing reservation scan > > + * @smmu: SMMU device of this kernel that failed its reservation scan > > And wouldn't need this either. > > Actually I think this is overkill regardless, just leave the xarray with ASIDs > reserved. Who cares? ASID might be 8-bit that would have limited ASID slots. And it's a quite small step, so I think it might be worth keeping it. Thanks Nicolin