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 BC80AC61DBD for ; Tue, 25 Aug 2026 14:04:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=0V5t1x1pK9uYCjJ/9uKIiIH/Jw4/B3JXGDVMFWbuomM=; b=zA7tL5yK4Lczyn 6v8OdBZvl3O3q9RY7YRa7TDeshFN7CZ3SfnNYlON5bD6Qo3fl7Oe/fXPssjG0eFyR1ViBm2lIr2GC OAgzeBaJuwpDHFw/4+HEsQFORfdwJf1AvR5iERAXo2synq7K+wBP6F7T8eEX+0Yl5od95ZV1w09+8 fKK7JfRsm2gCUmIFoCsUYbYjkQUAbUrY5voTSfEWL2m4c00Q8Nkb0mYXDu9btJD/wUECp6MseXgC7 9UJPc2TymSKKilFYvgRiNac/hCOXh/H/AyK6x3SpopbnvpbeHkXjcM3iRE83CVUL/WnpAcCDL2dVZ f1EL7VisZkn5qrkdqoug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wyrki-00000000vKq-1xKV; Tue, 25 Aug 2026 14:03:48 +0000 Received: from mail-eastusazlp17011000f.outbound.protection.outlook.com ([2a01:111:f403:c100::f] helo=BL2PR02CU003.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wyrkg-00000000vJs-0Kw7 for linux-riscv@lists.infradead.org; Tue, 25 Aug 2026 14:03:47 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=snF7AAtg+4Z8iJrdDP7jsi7pcGzE4o/MxDl7N7VLte4PzZLIGgk0bJuZ7FkozjHZ7eRbSB6Vh+QIhDUWpTLFi+EDiQbB6jED40SYfSqOZlXrS4Vfm6CyMP4abhC0V4dL4dXUbektvceS2NNu50/X9aJ8oE3P3oakh6RWYR7ppzt4aQ82hgIwrMcXut5kdffYh7UrBmwqGZm/vRQlNM0OOSdA3/57IMS4ZyZXxI03wX/bIcuxK0eW23mqemflkQRGjEmTKImZOxEbPR07Ixvc3dy/dGAuqN5A8+agrM3Len1okiMETcbDL0fR/aG2k/tvwks/vabGPoPkjDDA28Ba2Q== 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=2w+KYeTEDwWpJnGrk/NwHa9HAHqY52KDKaQJL9PeOEA=; b=bFnDqtziFw2ItIM+eoTsdHSu31vauI+za3P8M40WCHjDgdE4B3+rbEWat0YJh4uc/ijGFk4pCGuifWZzIFgfB9hpGJhBRPJvbDQKFzWR3UvZvX1020qP6a17ngtIosylBEI7yVQFYFoMN9RX1XgkFHLcYWJspYUbBMQHVYGd/uXxdNtVTTZ83Ut9ld1fLO7fNHSyAFnZKEus5lrOVSvbAsDJjtvEX03/It3WMV0+kOejWDey/55O2gJoUGWG7z0L2mkKho6CMGr4jMdtC8Rjjm0UHBLgqyWnR6GaywmHEuOQno5FFpJ7pV398doEaNXUxvEa3it56tCUfNUVY0gKiw== 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=2w+KYeTEDwWpJnGrk/NwHa9HAHqY52KDKaQJL9PeOEA=; b=lvUIWL6H7jebqwNHo30JUVlezlzAgmCrYj/foZEhbEW9kT5gTLXcsn/SRUC9GJH1GRRtpQXUfi/BB8/EA82Fy/tauW5yR3ooucTPSkm8LnJ9NLdtRt4fxaowQ+JlDL5t9GUtlg0e3DAEVu0UkUGrKvSTZz8nRNTcherVqpBHAm6U86bSOhXiAIrVM4fktvVAoDkE8KYrWZr0+sjIao22f1arJvWYHPBKqj3yE/wO2THuQ0Hx4spSYI1NkEMyQyZInO4fU/k7k+yaK1rRrGN01X15BQoDNLO1/YPcMrpVPS+6lBFOM+llTQcz3Fb747AwT+2cv0gLKsTIxsNgJy74Lg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from LV8PR12MB9620.namprd12.prod.outlook.com (2603:10b6:408:2a1::19) by SA3PR12MB7783.namprd12.prod.outlook.com (2603:10b6:806:314::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.339.12; Tue, 25 Aug 2026 14:03:35 +0000 Received: from LV8PR12MB9620.namprd12.prod.outlook.com ([fe80::299d:f5e0:3550:1528]) by LV8PR12MB9620.namprd12.prod.outlook.com ([fe80::299d:f5e0:3550:1528%4]) with mapi id 15.21.0339.012; Tue, 25 Aug 2026 14:03:35 +0000 Date: Tue, 25 Aug 2026 11:03:34 -0300 From: Jason Gunthorpe To: Andrew Jones Cc: linux-riscv@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, tomasz.jeznach@linux.dev, tjeznach@rivosinc.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, anup@brainfault.org, tglx@kernel.org, kevin.tian@intel.com, fangyu.yu@linux.alibaba.com Subject: Re: [PATCH v4 02/21] iommufd: Add iommufd_sw_map_msi() Message-ID: <20260825140334.GA3325090@nvidia.com> References: <20260821161256.GK244917@nvidia.com> <20260821172015.GL244917@nvidia.com> <20260822140625.GM244917@nvidia.com> <20260824125204.GP244917@nvidia.com> <20260824170417.GR244917@nvidia.com> <3gdj54zcs5dncgom3zlntyredyuh2xe5ueg7nd4pdrcksmnwfl@k3fyky4h6556> Content-Disposition: inline In-Reply-To: <3gdj54zcs5dncgom3zlntyredyuh2xe5ueg7nd4pdrcksmnwfl@k3fyky4h6556> X-ClientProxiedBy: YT4PR01CA0193.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:ad::25) To LV8PR12MB9620.namprd12.prod.outlook.com (2603:10b6:408:2a1::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV8PR12MB9620:EE_|SA3PR12MB7783:EE_ X-MS-Office365-Filtering-Correlation-Id: bd5b0d68-528f-43ed-e599-08df02b1a785 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|23010399003|366016|1800799024|6133799003|10067099003|11063799006|56012099006|4143699003|18002099003|22082099003; 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:LV8PR12MB9620.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(23010399003)(366016)(1800799024)(6133799003)(10067099003)(11063799006)(56012099006)(4143699003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?pa3+B+QjNeLrN73pxAsGDxqNaTxADCmnY/OlSSo4U8l7KfsnTVnJCZ8d583M?= =?us-ascii?Q?9JQq1E4bdqaxaFQJue4CTWrTtrgF4V1TZ2AP+14JKScheB96moLuq6AsL9vl?= =?us-ascii?Q?yy0txTMFC/srBTkj9fFd29lX75pgc6B2Ue8kT1Y6pMnO0FEjBGRKDlc/rTpT?= =?us-ascii?Q?a0kY8vLJiJbAOLtSidZb0mUF6ftiyPRmc/jdaDAO6AMqyUF9hLxM4IMI+AWH?= =?us-ascii?Q?f926HBFcya2rJyATD7yYSw4NXlHqW+WVLHX9kTzzLB6q4yBCFes/4eY2gKB9?= =?us-ascii?Q?SqIjAnn39yQPseVlvl5z8WIvWfrIf+LSDXMKUojNYubCpnqN2K/QHmWdA1D+?= =?us-ascii?Q?2oI6gxj4oOugP8aTboRVcVLgm7jqCUgA+GFGekYMx0NN+y51X1bp3XUIlyDT?= =?us-ascii?Q?4BahSXt/k7Iy5/NQAMMVUu4ofO26vt9EDT28gftQEQWd0qVMqtpAz/qiCCvY?= =?us-ascii?Q?YPAhoLxwNMu4BjFL23+dBdd7cx/JWYtLS0jvjt+hx9awUnn/c/hFpF4GX9bx?= =?us-ascii?Q?4YIwcNcHkI5FRssvpdFcZo/t3p32MDJpz9Y4RqxGIUteWVwMoiQd1WhSDSE2?= =?us-ascii?Q?DfNPP3lOS79nK5zOCsWM6Xngh6hE1xMeNc/dqEokneEkI/Jf2DDrXb6CH5Z/?= =?us-ascii?Q?mTI+GFWdGv1T4hcNIkVdTrwS93DWMjmMKwFzqowf0IoRAHAfvOKqomJKkdIS?= =?us-ascii?Q?2PkP3bBUSD4qkBS1tBTJvn5Q/6U3M2e0fJ2x/a5SJHK0cME4fchpJVsikh97?= =?us-ascii?Q?HSsnC86aTi9qsCBDqW548iDBaObaW7rxYWGQDPcr492KuSGtehVMwkaEiOvB?= =?us-ascii?Q?OU6Ka/Yjo4GFBNx90irMq+Yy+ivZ3mnMU4t0a6pO1nJfKpiJ28I58aB2XA42?= =?us-ascii?Q?8srwOdR+0mAyCpZvPqb2VFHRgXW9G7yEqrbbGvflWPpg0tyM1b6UfoVp40in?= =?us-ascii?Q?XzNz5bWMcOsd4Nkk/+XpxxTqA/vb7MlaxcVAJ6hCIV0k47GETQ7yMERI4IPB?= =?us-ascii?Q?kRKfeVvItVP5Q09DNhlYWKY7NEcBCC1CSWv9XCtmmE8cuCoE6oy+GXBow2WR?= =?us-ascii?Q?EhJ+SZL5PdnFztoIJKVZRzGoDFbP6CbqzE301nZc5CXqSNEM7Z4R7+p3xWgZ?= =?us-ascii?Q?1KkQin9cL9bF76bvNl13rKhs5spZDzV9D9Xx2zd5YN6tKznFdSZUTttoF24k?= =?us-ascii?Q?b46sE8pKO7xTHCJH3+IxOW5Z2WKXXUcuepDYrA12USBKl6brTiI0Gc11rVpm?= =?us-ascii?Q?w3+RDDakrhpqjZaYGP+59CGogWLCWdWopON6GxJdDi4m7S7yo25Z8kRSlO/E?= =?us-ascii?Q?NVrjg6BlGtvldNEq8ArH9gQwxPbDO9Fvxw3HICL4ace8y86WCUB5OsHy3wsM?= =?us-ascii?Q?yHn8fY14177kMSs0tYJHqXqT4aHkiokuU5EWVW8SCSZMEgeVX3YOfYs5nXa4?= =?us-ascii?Q?y+xhwA+FcLHEPbEXQv2nsb9g8uj1rKnCuNUgOg/28dFgM4957OunthSUgyFS?= =?us-ascii?Q?mmg3ZR0Zyka8zJCANSoMHYixdHSnBsfwRCVfGfWfFlUHvKQSSmgi+sRqcFtJ?= =?us-ascii?Q?+lH4MLmW3WNTDBg7fPa68LYW8MlwBnEMZZyq43jtVvxkaDFj7TuikI6esws8?= =?us-ascii?Q?3bXnF0Op0wIWR632S91w3x8gXdCZRNEm7CijfPsc6Z5nPykVbFn6SfGlC92h?= =?us-ascii?Q?oMBn+Ub+sIiAlt0TIALx1v9Ebv7ap+1K444bZMvbGysQ9zdi?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: bd5b0d68-528f-43ed-e599-08df02b1a785 X-MS-Exchange-CrossTenant-AuthSource: LV8PR12MB9620.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Aug 2026 14:03:35.4655 (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: 5quxompRE9yKFwgKVQ6alWtTwINBbpwKxYRklPVgGiT423NqzJHOSE9T+6LL1OqJ X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB7783 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260825_070346_506417_09CCB57F X-CRM114-Status: GOOD ( 11.85 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, Aug 25, 2026 at 03:24:01PM +0200, Andrew Jones wrote: > The irqdomains remain per-device. The MSI table belongs to the > corresponding S2 IOMMU domain and its configuration is bound to one VM's > IMSIC topology. The current prototype rejects irqbypass from another VM > once the table has an owner. The irqdomain does not sit on top of the > vIOMMUs. A vIOMMU links guest-controlled S1 domains to their S2 parent, > while the per-device irqdomain is the IRQ-side entry point for updating > that parent's MSI table. Doesn't sound like the right design to me. Pretending it is not bound to the S2 just to make it global then blocking multi-VM is not a good place to start from. It needs a design where the guest remap is linked to the viommu so it can be per-vm, somehow. > For the host remapping implemented by this series, each irqdomain is > per-device because it is inserted into the device's IRQ hierarchy and > provides MSI remapping through irq_compose_msi_msg(). And this is an entirely different thing, you don't need a domain just to call irq_compose_msi_msg().. Jason _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv