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 B796BC4167B for ; Thu, 30 Nov 2023 01:17:47 +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=vqPpUnrLg3QN/7ucRj/+kPx4Tmr11KLWz9YnsZguLEg=; b=3k0lxH2aRiXEJM fDsAxYFVFFuMg5jnGErphIEbyCD2ljZQOZ0k9ZMXVNDyAenTwDAbFnXpp8oaf8V8zaGCCjL/tWsOJ SdZZCxzvqHdp3TzXdMKTo9zWjQfbiBs1hcez40cfPMGaMBkWeMD4I2vqaa5qWeEB31XpQyc8oS3mk 3LQtIax1wLDnu8yCGpa//Y+4GLzSl+f+zdxEebYljT2wcBQKxlMGGI7e4EF23tjxyYvkeuAVp3sHD Wq4qB16mlJnMp5vsbzEPXMuwOMPuTqwENYD5q1Lo8yS7zXp0ROZhiK3cANunNAQQgjxzHBVpjtiiq SMM8rn/g/m0F+txMJ4WQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r8Vg7-009f1u-2z; Thu, 30 Nov 2023 01:17:19 +0000 Received: from mail-bn1nam02on20615.outbound.protection.outlook.com ([2a01:111:f400:7eb2::615] helo=NAM02-BN1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r8Vfm-009eyR-35 for linux-arm-kernel@lists.infradead.org; Thu, 30 Nov 2023 01:17:00 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=fDC5eT71Unj2/FRJfzIkZKCCveUP9lG0NhBeQjIiOIKlG95gscjq3aI2V7wDwQH4jI6/FE8x9p7WLh3QtriB8N3NQ+CjLxO3XKkAk+NcXtlEQ81JlgPWB33Op5yjQOTqQdbp4iZcYCi2EihEXybjbORg2GIAhoXQL4lNmlVTS5uT//ukYTp7pExQsNmGt2Ai62+1Y0yYGYGZmpJLXcWAoLflhWe/r3TXzU8lj0ZvpB2BxbGnqYfYgBNN9I2iHcmdm97ntha+VkUYmQpx43/VMUujMz+rW8bcbSk8vB5whvgZrsBxf5h9BVpnKoeWWmv2LEB3Z8RuGUeiJmybJsQ4Ew== 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=NJybaXKoxS1ij6FMe+0qHBjC839Sq+sEYShCZGWfrf4=; b=hnU9e1ZvbCQm7OkK7Dtke4dhPu2ClHX7mIXCNIDApSV5psZSrViRrW9bM5Q70320q+5GkO/A3sk8XZ/M9xGvEoJTfZlWsLz9HxGltEy5TMTZphv8UCcnsaN2ROmVCvj2Jgq35iZdmmf1fO+oBtGpvLtF/CczZjNs5Kxjm0lipZALiIfxZAtXWY4kzYZNYiO/8wqUMBzyajyJyFa/iJMaZ0sc5Dpun3lB3T1zUbJi1Ba6E8DSjj4vkDhgB+f5vYu7rZinBBGLjVat7e8QndRy/ZBwYlCDR3uSqbmrj2Ll3EUCqqFpPjx08AoBH5eDRy0c2N2Y//VZydKcA6qscy8l7g== 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=NJybaXKoxS1ij6FMe+0qHBjC839Sq+sEYShCZGWfrf4=; b=Q+vUeptO+rYAcRNQmtTI7hvhAuTYTh1kNnie0VZJITxBxF2M1uQ+nyY58b4jotqYwSPwI7mkkXHR02MM8ZRrurijaGonAePqnqT0UUfl907zahnuxN47lPRgWdsz3mAmY6wsTusW84ub3VgH3qK9LjIJlOkE0WRnT4grUM5UlfIFUmWC5rjUlcXpz1yVYMeJmRYIs3EB9h31AYfRb5zbezcV32WqovIeP1UJLrFSFQNIOoBD6lsZXpzDWgpMHzCnZeVfEnshWbtAlLO4qYFe8i4HFL/UT1CkGbilAp1iK7oGIqD85XCQ37h9YMtUQrY3/Kb5jnaR6MJJ+7Fnb3Jo9g== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) by DS0PR12MB7581.namprd12.prod.outlook.com (2603:10b6:8:13d::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7025.27; Thu, 30 Nov 2023 01:16:52 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::60d4:c1e3:e1aa:8f93]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::60d4:c1e3:e1aa:8f93%4]) with mapi id 15.20.7046.015; Thu, 30 Nov 2023 01:16:52 +0000 Date: Wed, 29 Nov 2023 21:16:50 -0400 From: Jason Gunthorpe To: Sean Christopherson Cc: Michael Ellerman , Paolo Bonzini , Alexander Gordeev , Christian Borntraeger , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , Janosch Frank , Vasily Gorbik , Heiko Carstens , "H. Peter Anvin" , Claudio Imbrenda , James Morse , kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Marc Zyngier , Ingo Molnar , Nicholas Piggin , Oliver Upton , Suzuki K Poulose , Sven Schnelle , Thomas Gleixner , Will Deacon , x86@kernel.org, Zenghui Yu Subject: Re: Ping? Re: [PATCH rc] kvm: Prevent compiling virt/kvm/vfio.c unless VFIO is selected Message-ID: <20231130011650.GD1389974@nvidia.com> References: <0-v1-08396538817d+13c5-vfio_kvm_kconfig_jgg@nvidia.com> <87edgy87ig.fsf@mail.lhotse> <875y1k3nm9.fsf@mail.lhotse> Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SN7PR04CA0085.namprd04.prod.outlook.com (2603:10b6:806:121::30) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|DS0PR12MB7581:EE_ X-MS-Office365-Filtering-Correlation-Id: c5797e53-7458-4c87-ac7e-08dbf14208d5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 3bF5QNpTAam1PN/BHwfcZQUPwOILHDN0xVdJNrzDbt0+F4nY1MT9mzEZ0R2hs6V1F8hWGm3P5EbZimeKAHytzaKDf2FjDNZkyollAK8kv4QxJ8aE+PPdonQ3F8HTO9wTRfAE7ZD7GaTBoJgOK6b9QliJh+d5VrdI0Y75WQuLC7aXQmAqEDQVTwrAXkfqKtvrVDIWCghbZ5Gywxl8tCF3cy4W3av7P4Hw9CVeGSxkUlyDGCx36Da/W4kkhcFvFT6ovj2Uwt3LAECCalioWpRldfHY81ZHs/Tk3OA7v4v3MCb58zBbU2YrboLvSZtFvl3CG7ndc92DtF86Tk13m8r20+7RYVTOcwVvLeTv3udDz8nOIzuc36wC4U+nkM40dmtEL0FLTMJN8f/vFM0ZnpQaffafXHZjUyaj4yFPrd5ipqq5jYuN0qH766Bq2Uf7G4O8qfEc6g3G95gsGq8aF4kZznNQRbCkehQiEIC1oKQwFRBmS7XW2TB1BU4krc8BIgyp3oYKGWM6r9GFKnbFhLPOY0CK0wgxp6/py27R1r1FVyU9NKZ4e65tvfxxSsyCT5i22e7SFDrRU3Vu6XJ7uoCw2svtBem3Xg2m6DGA7xBrQMsCZBeka8rKp8Z6zskCCuh7hoxLX9TOfbPp0U33Zg+5IdPb4o3EOem/iVJXxfbEXp0= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV2PR12MB5869.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(396003)(346002)(366004)(376002)(39860400002)(136003)(230173577357003)(230273577357003)(230922051799003)(186009)(64100799003)(451199024)(1800799012)(2616005)(1076003)(202311291699003)(26005)(6512007)(8936002)(6506007)(5660300002)(4326008)(66556008)(8676002)(6486002)(7406005)(7416002)(66476007)(54906003)(478600001)(6916009)(316002)(66946007)(38100700002)(83380400001)(86362001)(41300700001)(33656002)(36756003)(2906002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Da/nBxj3F0ZIeLjhsfYx9TaIvvy8N5Ga/0bHvPPcmk5B4okAdeIDASjzJufm?= =?us-ascii?Q?cqR1sl0j3NjeYVAuJKVqjU78OwufSl8gLmS2fEh2C6gSnEI5fkuaKCFRXAeF?= =?us-ascii?Q?GCxvKn9mnjnQ2pA50E2SDNTV8LUUGdH1byGUX9+HJfB7KMlvgCWPAQiwA6FW?= =?us-ascii?Q?vstKA8GbLjr3PBODD3zGFwj1Pf5p+uiFrKheERWnnoriz7z6EW4ybWVTcUgm?= =?us-ascii?Q?jy8jctMXyVp5iUKJ/ZnFQPgm7tVUOEkaVF6VC3A0d/ihIXwmm4E7YOqsSpJC?= =?us-ascii?Q?LZrQqZNxYrdjYVB+9hkUqnQQOxdprbASkPvIog31S+2OCFNYSK5uxzTDIGx4?= =?us-ascii?Q?sWmFxJz7SRTOSkv2k2zHJOuwWStykEjphUzsV+ZMaczpmpawv6SEHjM3bJct?= =?us-ascii?Q?BFd52tP06S78cNfadyc1iqSXP9TxUHLhAVvtNmUyO/0n89U0HtC3muHl+TN8?= =?us-ascii?Q?Mq9+pBzh7ckWs49K180+w27LAaYuUkmittPtrwo+x/UHD9EAp7NPYkuGheXH?= =?us-ascii?Q?d2DGN1dUuE2qfe4j8cSD7Lb9eNsaEVfn9zsOGQ+Rgyryx4kIYkJ764BppM3l?= =?us-ascii?Q?Ok1+0uVf/Sq9TA3YVDdf5/a3uIifAp/CyTtHPXuhps8wWlJCP0HZwn3fdhMR?= =?us-ascii?Q?/X1zEsobptMwxUi9gNWmKXwE94fiVFzO1+hnk2g6cV0HZjOJCV14FSrhZpSp?= =?us-ascii?Q?NgDnYljyC+n/GV8AOCG47SAoZOlaIdXYc5rCeZnDcaEUjhWB6Dhb8+OzpJsy?= =?us-ascii?Q?ERVe5apUsOXD0ajlwiyoHEveGib8epN8IHhHwCFtWV63hHsIhL9CuCOp3tOH?= =?us-ascii?Q?m87FyohKaeFyVbYMomgxfN8Rw6WgrR9sY8fSpqnllHlBHuCzWKFyRmLTa84e?= =?us-ascii?Q?v4J8YcuGDH/OX9JNg/Hw6D+c/uxnt8LZnwBr21nEqShPpeAw2Knjg8XuP9QY?= =?us-ascii?Q?YFEkVqMsrm3GlspNPmYXfKcw1tjv8LyYQoACZ+aS2abJXYCPeEXP0NgmNx65?= =?us-ascii?Q?mFoiT0Zg25KsNGu3EQM2gyzXiFysGLtqRqBPyyrImEqykHyt6miBLStkxial?= =?us-ascii?Q?CQMCsKxQsCUY10CcTEZ/E2obLPa7DhjhAqfJzT3UV0MSQaGTG7rc7PnpKCd8?= =?us-ascii?Q?xV64iN3ePINWNcJJTG214/DrQjLLFmM+Z4uRVSZZfy8Um4+jIYESAOBw88Xf?= =?us-ascii?Q?5dtmhqKfTOqoUp7ogtZ1OR9lxblYp0UIXZ16HdS17fTV/X/tFeD7f3fMJ0rl?= =?us-ascii?Q?OXg92TKuZ7KTQsicNifWgfGs3N5aTmBlUJnfSKQabBp60zWWHHdT6tibWkZL?= =?us-ascii?Q?79hg/5NFHA+N6/5GL8PmtjV8YGvkC8ly98kQmcboFEQyVe7j/m6cMzj7Bugz?= =?us-ascii?Q?cQC4wQPd+n89gRtVGc9cyJLqmlzIzdBb8f12PelMUdJBIQOBwvFS2lx8g5T7?= =?us-ascii?Q?5O3yqgKsJTVVC7KfDw+R/4GzBXnDqqu/nPMnd22YXFz6NdzFalUJPGia5oxH?= =?us-ascii?Q?xaaWo6ZFhzs9eVU8efyvDzPm/JQNauRBAGYqpRtZaAGBQRhQUv9sqMH1+fQ0?= =?us-ascii?Q?K7SoiMDAxhbtLe9iZ2hf0oJr8lfNt9gnYuZbtp1O?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: c5797e53-7458-4c87-ac7e-08dbf14208d5 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Nov 2023 01:16:52.2389 (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: fi8fNVD39stje3lQebAL5yh829kd1t4Ex77o2RS8hFFqsG4uVqeCeX2V1ozRkJru X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7581 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231129_171659_001299_C708241D X-CRM114-Status: GOOD ( 21.88 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Nov 29, 2023 at 05:07:45PM -0800, Sean Christopherson wrote: > On Wed, Nov 29, 2023, Michael Ellerman wrote: > > Sean Christopherson writes: > > > On Fri, Nov 10, 2023, Michael Ellerman wrote: > > >> Jason Gunthorpe writes: > > >> > There are a bunch of reported randconfig failures now because of this, > > >> > something like: > > >> > > > >> >>> arch/powerpc/kvm/../../../virt/kvm/vfio.c:89:7: warning: attribute declaration must precede definition [-Wignored-attributes] > > >> > fn = symbol_get(vfio_file_iommu_group); > > >> > ^ > > >> > include/linux/module.h:805:60: note: expanded from macro 'symbol_get' > > >> > #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak,visibility("hidden"))); &(x); }) > > >> > > > >> > It happens because the arch forces KVM_VFIO without knowing if VFIO is > > >> > even enabled. > > >> > > >> This is still breaking some builds. Can we get this fix in please? > > >> > > >> cheers > > >> > > >> > Split the kconfig so the arch selects the usual HAVE_KVM_ARCH_VFIO and > > >> > then KVM_VFIO is only enabled if the arch wants it and VFIO is turned on. > > > > > > Heh, so I was trying to figure out why things like vfio_file_set_kvm() aren't > > > problematic, i.e. why the existing mess didn't cause failures. I can't repro the > > > warning (requires clang-16?), but IIUC the reason only the group code is problematic > > > is that vfio.h creates a stub for vfio_file_iommu_group() and thus there's no symbol, > > > whereas vfio.h declares vfio_file_set_kvm() unconditionally. > > > > That warning I'm unsure about. > > Ah, it's the same warning, I just missed the CONFIG_MODULES=n requirement. Oh, wait, doesn't that mean the approach won't work? IIRC doesn't symbol_get turn into just &fn when non-modular turning this into a link failure without the kconfig part? Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel