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Signed-off-by: Stewart Hildebrand --- xen/drivers/vpci/vpci.c | 6 ++++++ xen/include/xen/vpci.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index d73fa7630237..acadba1fd6c5 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -133,6 +133,12 @@ static void cf_check vpci_ignored_write( { } =20 +uint32_t cf_check vpci_hw_read8( + const struct pci_dev *pdev, unsigned int reg, void *data) +{ + return pci_conf_read8(pdev->sbdf, reg); +} + uint32_t cf_check vpci_hw_read16( const struct pci_dev *pdev, unsigned int reg, void *data) { diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 0b8a2a3c745b..ee7a8fcdee83 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -46,6 +46,8 @@ void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsign= ed int size, uint32_t data); =20 /* Passthrough handlers. */ +uint32_t cf_check vpci_hw_read8( + const struct pci_dev *pdev, unsigned int reg, void *data); uint32_t cf_check vpci_hw_read16( const struct pci_dev *pdev, unsigned int reg, void *data); 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helo=lists.xenproject.org; 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=SATLEXMB04.amd.com; pr=C From: Stewart Hildebrand To: CC: Stewart Hildebrand , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v1 2/3] xen/vpci: add vpci_read_val helper Date: Thu, 10 Aug 2023 15:12:58 -0400 Message-ID: <20230810191312.644235-3-stewart.hildebrand@amd.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230810191312.644235-1-stewart.hildebrand@amd.com> References: <20230810191312.644235-1-stewart.hildebrand@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EDD6:EE_|SJ0PR12MB6829:EE_ X-MS-Office365-Filtering-Correlation-Id: e91fbfb2-1328-4f37-134a-08db99d5f323 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(346002)(39860400002)(136003)(376002)(396003)(186006)(82310400008)(1800799006)(451199021)(36840700001)(46966006)(40470700004)(478600001)(70206006)(70586007)(4326008)(6916009)(5660300002)(316002)(54906003)(41300700001)(40460700003)(8936002)(8676002)(26005)(1076003)(86362001)(82740400003)(336012)(40480700001)(44832011)(36756003)(47076005)(36860700001)(81166007)(356005)(2906002)(2616005)(426003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2023 19:13:58.8209 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e91fbfb2-1328-4f37-134a-08db99d5f323 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EDD6.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6829 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1691694861840100001 Content-Type: text/plain; charset="utf-8" Introduce a vPCI read helper function that returns a fixed value. This may = be used for RAZ registers, or registers whose value doesn't change. This helper will be used in a subsequent patch. Signed-off-by: Stewart Hildebrand --- RFC: I'm not a fan of the (uintptr_t) cast, but without it I wasn't sure ho= w to pass a value without allocating more memory (either with an xalloc fun= ction of sorts, or by adding a new element in struct vpci_register and chang= ing the interface). Plus, in the current state, to pass a value to vpci_add_register(), it may be necessary to cast twice: (void *)(uintptr_t)myval. See next patch. Perhaps a new allocation is = worth it to avoid the casts? Or maybe I'm being overly pedantic and the cast= s are okay? --- xen/drivers/vpci/vpci.c | 6 ++++++ xen/include/xen/vpci.h | 3 +++ 2 files changed, 9 insertions(+) diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index acadba1fd6c5..4a96aa50494d 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -133,6 +133,12 @@ static void cf_check vpci_ignored_write( { } =20 +uint32_t cf_check vpci_read_val( + const struct pci_dev *pdev, unsigned int reg, void *data) +{ + return (uintptr_t)data; +} + uint32_t cf_check vpci_hw_read8( const struct pci_dev *pdev, unsigned int reg, void *data) { diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index ee7a8fcdee83..17fd252746ec 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -45,6 +45,9 @@ uint32_t vpci_read(pci_sbdf_t sbdf, unsigned int reg, uns= igned int size); void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, uint32_t data); =20 +uint32_t cf_check vpci_read_val( + const struct pci_dev *pdev, unsigned int reg, void *data); + /* Passthrough handlers. */ uint32_t cf_check vpci_hw_read8( const struct pci_dev *pdev, unsigned int reg, void *data); --=20 2.41.0 From nobody Sat May 11 12:56:41 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; arc=pass (i=1 dmarc=pass fromdomain=amd.com); dmarc=pass(p=quarantine dis=none) header.from=amd.com ARC-Seal: i=2; a=rsa-sha256; t=1691694876; cv=pass; d=zohomail.com; s=zohoarc; b=PcHHn/AkTOQGov4kQVTlSPOMAzwvyEW8/QEO00+so6l89IjBYt+oVCIYRM2TQNK53SUFlaIww/GKJB/ExkXJYoyF5EOUIULHDpVTOPFn8RUJZBHT5AUe2fglKyOnbotRNwOjF81a4UfLBNIRBbLCh8EYxeo5IiqQvH/awO8OwFE= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1691694876; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2023 19:14:09.9684 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6e943005-87f0-423d-d03a-08db99d5f9cc 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: CO1PEPF000042AB.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9021 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1691694877478100001 Content-Type: text/plain; charset="utf-8" Xen vPCI only supports virtualizing the MSI and MSI-X capabilities, so all = other PCI capabilities should be hidden from a domU for now. We parse the physica= l PCI capabilities linked list and add vPCI register handlers for the next elemen= ts, inserting our own next value, thus presenting a modified linked list to the domU. Signed-off-by: Stewart Hildebrand --- If there are no capabilities to be exposed to the guest, a future status register handler likely would want to mask the PCI_STATUS_CAP_LIST bit. I'm thinking we could track this in struct vpci_header as follows: vpci.h: struct vpci_header { ... + bool mask_cap_list : 1; } header; header.c:init_bars(): rc =3D vpci_add_register(pdev->vpci, vpci_read_val, NULL, PCI_CAPABILITY_LIST, 1, (void *)(uintptr_t)next); if ( rc ) return rc; + if ( !next ) + header->mask_cap_list =3D true; + for ( ttl =3D 48; ttl > 0; ttl-- ) { uint8_t pos; --- xen/drivers/vpci/header.c | 78 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 60f7049e3498..cb1304fa1eed 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -513,6 +513,36 @@ static void cf_check rom_write( rom->addr =3D val & PCI_ROM_ADDRESS_MASK; } =20 +static uint8_t vpci_find_next_cap(pci_sbdf_t sbdf, uint8_t pos) +{ + uint8_t id; + int ttl; + + if ( pos < 0x40 ) + pos =3D pci_conf_read8(sbdf, PCI_CAPABILITY_LIST); + else + pos =3D pci_conf_read8(sbdf, pos + PCI_CAP_LIST_NEXT); + + for ( ttl =3D 48; ttl > 0; ttl-- ) + { + if ( pos < 0x40 ) + break; + + pos &=3D ~3; + id =3D pci_conf_read8(sbdf, pos + PCI_CAP_LIST_ID); + + if ( id =3D=3D 0xff ) + break; + + if ( id =3D=3D PCI_CAP_ID_MSI || + id =3D=3D PCI_CAP_ID_MSIX ) + return pos; + + pos =3D pci_conf_read8(sbdf, pos + PCI_CAP_LIST_NEXT); + } + return 0; +} + static int cf_check init_bars(struct pci_dev *pdev) { uint16_t cmd; @@ -544,6 +574,54 @@ static int cf_check init_bars(struct pci_dev *pdev) if ( rc ) return rc; =20 + if ( !is_hardware_domain(pdev->domain) ) + { + if ( (pci_conf_read16(pdev->sbdf, PCI_STATUS) & PCI_STATUS_CAP_LIS= T) + =3D=3D 0 ) + { + /* RAZ/WI */ + rc =3D vpci_add_register(pdev->vpci, vpci_read_val, NULL, + PCI_CAPABILITY_LIST, 1, NULL); + if ( rc ) + return rc; + } + else + { + /* Only expose capabilities to the guest that vPCI can handle.= */ + uint8_t next, ttl; + + next =3D vpci_find_next_cap(pdev->sbdf, PCI_CAPABILITY_LIST); + + rc =3D vpci_add_register(pdev->vpci, vpci_read_val, NULL, + PCI_CAPABILITY_LIST, 1, + (void *)(uintptr_t)next); + if ( rc ) + return rc; + + for ( ttl =3D 48; ttl > 0; ttl-- ) + { + uint8_t pos; + + if ( !next ) + break; + + pos =3D next; + next =3D vpci_find_next_cap(pdev->sbdf, pos); + + rc =3D vpci_add_register(pdev->vpci, vpci_hw_read8, NULL, + pos + PCI_CAP_LIST_ID, 1, NULL); + if ( rc ) + return rc; + + rc =3D vpci_add_register(pdev->vpci, vpci_read_val, NULL, + pos + PCI_CAP_LIST_NEXT, 1, + (void *)(uintptr_t)next); + if ( rc ) + return rc; + } + } + } + if ( pdev->ignore_bars ) return 0; =20 --=20 2.41.0