From patchwork Tue May 14 14:33:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stewart Hildebrand X-Patchwork-Id: 13664203 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 DAC25C04FFE for ; Tue, 14 May 2024 14:34:49 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.721582.1125122 (Exim 4.92) (envelope-from ) id 1s6tEp-0005Kl-4s; Tue, 14 May 2024 14:34:43 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 721582.1125122; Tue, 14 May 2024 14:34:43 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1s6tEp-0005Ke-1B; Tue, 14 May 2024 14:34:43 +0000 Received: by outflank-mailman (input) for mailman id 721582; Tue, 14 May 2024 14:34:42 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1s6tEo-0004xK-IB for xen-devel@lists.xenproject.org; Tue, 14 May 2024 14:34:42 +0000 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on20601.outbound.protection.outlook.com [2a01:111:f403:2412::601]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 18ab5345-11ff-11ef-909d-e314d9c70b13; Tue, 14 May 2024 16:34:41 +0200 (CEST) Received: from MW4PR03CA0105.namprd03.prod.outlook.com (2603:10b6:303:b7::20) by SN7PR12MB6911.namprd12.prod.outlook.com (2603:10b6:806:261::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7544.55; Tue, 14 May 2024 14:34:36 +0000 Received: from CO1PEPF000066E8.namprd05.prod.outlook.com (2603:10b6:303:b7:cafe::a) by MW4PR03CA0105.outlook.office365.com (2603:10b6:303:b7::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7544.55 via Frontend Transport; Tue, 14 May 2024 14:34:36 +0000 Received: from SATLEXMB03.amd.com (165.204.84.17) by CO1PEPF000066E8.mail.protection.outlook.com (10.167.249.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7587.21 via Frontend Transport; Tue, 14 May 2024 14:34:35 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 14 May 2024 09:34:34 -0500 Received: from ubuntu.mshome.net (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Tue, 14 May 2024 09:34:32 -0500 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 18ab5345-11ff-11ef-909d-e314d9c70b13 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=C86yrNUpMdZq+nJsTt1XuYh0Fw3MoV5MPVmkSU+eSZd3qBjQicV3Aj1B+FAh1UqEDM6EXvBnhYyLFL+Aeo3ETXB0iZgrifM0wsnbmeHswoilLKYG5fK/coeMSfXZ7msjPZ+NlWAHA5MoJW6ubZTjGWXTnzJkgx9+fWviRuHrqIVQyLDoRdEVW2dDBqEbbGp1LjQKXRSMG01fL0Mq23ZbiB4RJJ00yDef4G6GfWobaVNg5A1ju7deJjFOK7hDzjMX6uwr4Fj+Og3wiTy8/3bWTgLYoCc0hAW/qwjfAnLv785vfJ/K97wfAtjk01lgZEiOfwfgi34ICWesOmxfqkYB5A== 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=snqZUZKvXcG+0ruyZzznMKpfTsrySOP3X8wsZHFKOLM=; b=P6CdCkh81NS3syoOwydVTeCj8ee0kUJRzIGeDnHBWhwgoN2CdATaH7JO6aXvudqM6BjidbOfj9zyCVDUWLtei98fVo9i3HixE2ecoMipHlrTx52pRotgsclYJI3Fh8yyAk9A939XCSN5Mwm3ZkSgaU6kU/8g3U7AAXhejAt7zVHkews1oLh4hrkl9AOou2XooHOxHE31/9ORTIU1gUwMOJT1YWPu8ek9IxoujMDFx/rZDHahhWxfdkukKBNLqWtZ5jIG/cJ3mMfaXfLdTttQe4l18XbIcXrgqE1PcBZCvPtphY243yZvAgh+A2OkDe17Qwz63gh/v/rsT6x2V+Uxdg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=lists.xenproject.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) 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=snqZUZKvXcG+0ruyZzznMKpfTsrySOP3X8wsZHFKOLM=; b=0TzH70P4RSpzIkBQp5+G6QXIJwjSp0cGsz4MrfjkZNOWHfioeURCRq0MgOdqva5UkKsqwBnLeSdrW+uO0gdqOAmzh5xDsGAYVdtEvj0bkxbO5xmXEXSVO6NaA5792OW94WttjLqoIQftPUVdqoqxPdf86zyFa/rJF/qaTeBq0ww= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C From: Stewart Hildebrand To: CC: Oleksandr Andrushchenko , Andrew Cooper , George Dunlap , "Jan Beulich" , Julien Grall , "Stefano Stabellini" , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , Stewart Hildebrand , Volodymyr Babchuk Subject: [PATCH v14 2/5] vpci: add initial support for virtual PCI bus topology Date: Tue, 14 May 2024 10:33:54 -0400 Message-ID: <20240514143400.152280-3-stewart.hildebrand@amd.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240514143400.152280-1-stewart.hildebrand@amd.com> References: <20240514143400.152280-1-stewart.hildebrand@amd.com> MIME-Version: 1.0 Received-SPF: None (SATLEXMB03.amd.com: stewart.hildebrand@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000066E8:EE_|SN7PR12MB6911:EE_ X-MS-Office365-Filtering-Correlation-Id: e10c92a1-2e7c-4b8d-d914-08dc7422fa4f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|82310400017|1800799015|36860700004|376005; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(82310400017)(1800799015)(36860700004)(376005);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 May 2024 14:34:35.5296 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e10c92a1-2e7c-4b8d-d914-08dc7422fa4f X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000066E8.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6911 From: Oleksandr Andrushchenko Assign SBDF to the PCI devices being passed through with bus 0. The resulting topology is where PCIe devices reside on the bus 0 of the root complex itself (embedded endpoints). This implementation is limited to 32 devices which are allowed on a single PCI bus. Please note, that at the moment only function 0 of a multifunction device can be passed through. Signed-off-by: Oleksandr Andrushchenko Signed-off-by: Volodymyr Babchuk Signed-off-by: Stewart Hildebrand Acked-by: Jan Beulich --- In v13: - s/depends on/select/ in Kconfig - check pdev->sbdf.fn instead of two booleans in add_virtual_device() - comment #endifs in sched.h - clarify comment about limits in vpci.h with seg/bus limit In v11: - Fixed code formatting - Removed bogus write_unlock() call - Fixed type for new_dev_number In v10: - Removed ASSERT(pcidevs_locked()) - Removed redundant code (local sbdf variable, clearing sbdf during device removal, etc) - Added __maybe_unused attribute to "out:" label - Introduced HAS_VPCI_GUEST_SUPPORT Kconfig option, as this is the first patch where it is used (previously was in "vpci: add hooks for PCI device assign/de-assign") In v9: - Lock in add_virtual_device() replaced with ASSERT (thanks, Stewart) In v8: - Added write lock in add_virtual_device Since v6: - re-work wrt new locking scheme - OT: add ASSERT(pcidevs_write_locked()); to add_virtual_device() Since v5: - s/vpci_add_virtual_device/add_virtual_device and make it static - call add_virtual_device from vpci_assign_device and do not use REGISTER_VPCI_INIT machinery - add pcidevs_locked ASSERT - use DECLARE_BITMAP for vpci_dev_assigned_map Since v4: - moved and re-worked guest sbdf initializers - s/set_bit/__set_bit - s/clear_bit/__clear_bit - minor comment fix s/Virtual/Guest/ - added VPCI_MAX_VIRT_DEV constant (PCI_SLOT(~0) + 1) which will be used later for counting the number of MMIO handlers required for a guest (Julien) Since v3: - make use of VPCI_INIT - moved all new code to vpci.c which belongs to it - changed open-coded 31 to PCI_SLOT(~0) - added comments and code to reject multifunction devices with functions other than 0 - updated comment about vpci_dev_next and made it unsigned int - implement roll back in case of error while assigning/deassigning devices - s/dom%pd/%pd Since v2: - remove casts that are (a) malformed and (b) unnecessary - add new line for better readability - remove CONFIG_HAS_VPCI_GUEST_SUPPORT ifdef's as the relevant vPCI functions are now completely gated with this config - gate common code with CONFIG_HAS_VPCI_GUEST_SUPPORT New in v2 --- xen/drivers/Kconfig | 4 +++ xen/drivers/vpci/vpci.c | 57 +++++++++++++++++++++++++++++++++++++++++ xen/include/xen/sched.h | 10 +++++++- xen/include/xen/vpci.h | 12 +++++++++ 4 files changed, 82 insertions(+), 1 deletion(-) diff --git a/xen/drivers/Kconfig b/xen/drivers/Kconfig index db94393f47a6..20050e9bb8b3 100644 --- a/xen/drivers/Kconfig +++ b/xen/drivers/Kconfig @@ -15,4 +15,8 @@ source "drivers/video/Kconfig" config HAS_VPCI bool +config HAS_VPCI_GUEST_SUPPORT + bool + select HAS_VPCI + endmenu diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 97e115dc5798..23722634d50b 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -40,6 +40,49 @@ extern vpci_register_init_t *const __start_vpci_array[]; extern vpci_register_init_t *const __end_vpci_array[]; #define NUM_VPCI_INIT (__end_vpci_array - __start_vpci_array) +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT +static int add_virtual_device(struct pci_dev *pdev) +{ + struct domain *d = pdev->domain; + unsigned int new_dev_number; + + if ( is_hardware_domain(d) ) + return 0; + + ASSERT(rw_is_write_locked(&pdev->domain->pci_lock)); + + /* + * Each PCI bus supports 32 devices/slots at max or up to 256 when + * there are multi-function ones which are not yet supported. + */ + if ( pdev->sbdf.fn ) + { + gdprintk(XENLOG_ERR, "%pp: only function 0 passthrough supported\n", + &pdev->sbdf); + return -EOPNOTSUPP; + } + new_dev_number = find_first_zero_bit(d->vpci_dev_assigned_map, + VPCI_MAX_VIRT_DEV); + if ( new_dev_number == VPCI_MAX_VIRT_DEV ) + return -ENOSPC; + + __set_bit(new_dev_number, &d->vpci_dev_assigned_map); + + /* + * Both segment and bus number are 0: + * - we emulate a single host bridge for the guest, e.g. segment 0 + * - with bus 0 the virtual devices are seen as embedded + * endpoints behind the root complex + * + * TODO: add support for multi-function devices. + */ + pdev->vpci->guest_sbdf = PCI_SBDF(0, 0, new_dev_number, 0); + + return 0; +} + +#endif /* CONFIG_HAS_VPCI_GUEST_SUPPORT */ + void vpci_deassign_device(struct pci_dev *pdev) { unsigned int i; @@ -49,6 +92,12 @@ void vpci_deassign_device(struct pci_dev *pdev) if ( !has_vpci(pdev->domain) || !pdev->vpci ) return; +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + if ( pdev->vpci->guest_sbdf.sbdf != ~0 ) + __clear_bit(pdev->vpci->guest_sbdf.dev, + &pdev->domain->vpci_dev_assigned_map); +#endif + spin_lock(&pdev->vpci->lock); while ( !list_empty(&pdev->vpci->handlers) ) { @@ -103,6 +152,13 @@ int vpci_assign_device(struct pci_dev *pdev) INIT_LIST_HEAD(&pdev->vpci->handlers); spin_lock_init(&pdev->vpci->lock); +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + pdev->vpci->guest_sbdf.sbdf = ~0; + rc = add_virtual_device(pdev); + if ( rc ) + goto out; +#endif + for ( i = 0; i < NUM_VPCI_INIT; i++ ) { rc = __start_vpci_array[i](pdev); @@ -110,6 +166,7 @@ int vpci_assign_device(struct pci_dev *pdev) break; } + out: __maybe_unused; if ( rc ) vpci_deassign_device(pdev); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 132b84199598..2dcd1d1a4f8a 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -486,7 +486,15 @@ struct domain * 2. pdev->vpci->lock */ rwlock_t pci_lock; -#endif +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + /* + * The bitmap which shows which device numbers are already used by the + * virtual PCI bus topology and is used to assign a unique SBDF to the + * next passed through virtual PCI device. + */ + DECLARE_BITMAP(vpci_dev_assigned_map, VPCI_MAX_VIRT_DEV); +#endif /* CONFIG_HAS_VPCI_GUEST_SUPPORT */ +#endif /* CONFIG_HAS_PCI */ #ifdef CONFIG_HAS_PASSTHROUGH struct domain_iommu iommu; diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 2064d9354f5b..980aded26fc1 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -21,6 +21,14 @@ typedef int vpci_register_init_t(struct pci_dev *dev); #define VPCI_ECAM_BDF(addr) (((addr) & 0x0ffff000) >> 12) +/* + * Maximum number of devices supported by the virtual bus topology: + * each PCI bus supports 32 devices/slots at max or up to 256 when + * there are multi-function ones which are not yet supported. + * This limit implies only segment 0, bus 0 is supported. + */ +#define VPCI_MAX_VIRT_DEV (PCI_SLOT(~0) + 1) + #define REGISTER_VPCI_INIT(x, p) \ static vpci_register_init_t *const x##_entry \ __used_section(".data.vpci." p) = (x) @@ -175,6 +183,10 @@ struct vpci { struct vpci_arch_msix_entry arch; } entries[]; } *msix; +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT + /* Guest SBDF of the device. */ + pci_sbdf_t guest_sbdf; +#endif #endif };