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Mon, 8 Jul 2024 04:13:20 +0000 From: Dongli Zhang To: qemu-devel@nongnu.org Cc: mst@redhat.com, marcel.apfelbaum@gmail.com, aswin.u.unnikrishnan@oracle.com, joe.jin@oracle.com Subject: [PATCH 1/1] pci: don't skip function 0 occupancy verification for devfn auto assign Date: Sun, 7 Jul 2024 21:10:56 -0700 Message-Id: <20240708041056.54504-1-dongli.zhang@oracle.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: BYAPR05CA0039.namprd05.prod.outlook.com (2603:10b6:a03:74::16) To SA0PR10MB6425.namprd10.prod.outlook.com (2603:10b6:806:2c0::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA0PR10MB6425:EE_|IA0PR10MB7273:EE_ X-MS-Office365-Filtering-Correlation-Id: 82a25cf3-474a-41a8-0073-08dc9f044d46 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=dongli.zhang@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org When the devfn is already assigned in the command line, the do_pci_register_device() may verify if the function 0 is already occupied. However, when devfn < 0, the verification is skipped because it is part of the last "else if". For instance, suppose there is already a device at addr=00.00 of a port. -device pcie-root-port,bus=pcie.0,chassis=115,id=port01,addr=0e.00 \ -device virtio-net-pci,bus=port01,id=vnet01,addr=00.00 \ When 'addr' is specified for the 2nd device, the hotplug is denied. (qemu) device_add virtio-net-pci,bus=port01,id=vnet02,addr=01.00 Error: PCI: slot 0 function 0 already occupied by virtio-net-pci, new func virtio-net-pci cannot be exposed to guest. When 'addr' is automatically assigned, the hotplug is not denied. This is because the verification is skipped. (qemu) device_add virtio-net-pci,bus=port01,id=vnet02 warning: PCI: slot 1 is not valid for virtio-net-pci, parent device only allows plugging into slot 0. Fix the issue by moving the verification into an independent 'if' statement. Fixes: 3f1e1478db2d ("enable multi-function hot-add") Reported-by: Aswin Unnikrishnan Signed-off-by: Dongli Zhang --- hw/pci/pci.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 4c7be52951..82ebd243d0 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -1186,14 +1186,15 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCI_SLOT(devfn), PCI_FUNC(devfn), name, bus->devices[devfn]->name, bus->devices[devfn]->qdev.id); return NULL; - } /* - * Populating function 0 triggers a scan from the guest that - * exposes other non-zero functions. Hence we need to ensure that - * function 0 wasn't added yet. - */ - else if (dev->hotplugged && - !pci_is_vf(pci_dev) && - pci_get_function_0(pci_dev)) { + } + + /* + * Populating function 0 triggers a scan from the guest that + * exposes other non-zero functions. Hence we need to ensure that + * function 0 wasn't added yet. + */ + if (dev->hotplugged && !pci_is_vf(pci_dev) && + pci_get_function_0(pci_dev)) { error_setg(errp, "PCI: slot %d function 0 already occupied by %s," " new func %s cannot be exposed to guest.", PCI_SLOT(pci_get_function_0(pci_dev)->devfn),