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Thu, 15 Jun 2023 04:45:27 +0000 From: Dexuan Cui To: bhelgaas@google.com, davem@davemloft.net, decui@microsoft.com, edumazet@google.com, haiyangz@microsoft.com, jakeo@microsoft.com, kuba@kernel.org, kw@linux.com, kys@microsoft.com, leon@kernel.org, linux-pci@vger.kernel.org, lpieralisi@kernel.org, mikelley@microsoft.com, pabeni@redhat.com, robh@kernel.org, saeedm@nvidia.com, wei.liu@kernel.org, longli@microsoft.com, boqun.feng@gmail.com, ssengar@microsoft.com, helgaas@kernel.org Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, josete@microsoft.com, simon.horman@corigine.com Subject: [PATCH v4 0/5] pci-hyperv: Fix race condition bugs for fast device hotplug Date: Wed, 14 Jun 2023 21:44:46 -0700 Message-Id: <20230615044451.5580-1-decui@microsoft.com> X-Mailer: git-send-email 2.17.1 X-ClientProxiedBy: CYZPR17CA0016.namprd17.prod.outlook.com (2603:10b6:930:8c::25) To BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR2101MB1092:EE_|PH7PR21MB3382:EE_ X-MS-Office365-Filtering-Correlation-Id: 79955498-005c-40d6-dbf8-08db6d5b56b6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Currently there are multiple race condition bugs in the pci-hyperv driver, which can cause the guest to panic. The patchset fixes the crashes. The patchset also does some cleanup work: patch 3 removes the useless hv_pcichild_state, and patch 4 reverts an old patch which is not really useful (without patch 4, it would be hard to make patch 5 clean). Patch 6 in v3 is dropped for now since it's a feature rather than a fix. Patch 6 will be split into two patches as suggested by Lorenzo and will be posted after the 5 patches are accepted first. The v4 addressed Lorenzo's comments and added Lorenzo' Acks to patch 1, 3 and 5. The v4 is based on v6.4-rc6, and can apply cleanly to the Hyper-V tree's hyperv-fixes branch. The patchset is also availsble in my github branch: https://github.com/dcui/tdx/commits/decui/vpci/v6.4-rc6-vpci-v4 FYI, v3 can be found here: https://lwn.net/ml/linux-kernel/20230420024037.5921-1-decui@microsoft.com/ Please review. Thanks! Dexuan Cui (5): PCI: hv: Fix a race condition bug in hv_pci_query_relations() PCI: hv: Fix a race condition in hv_irq_unmask() that can cause panic PCI: hv: Remove the useless hv_pcichild_state from struct hv_pci_dev Revert "PCI: hv: Fix a timing issue which causes kdump to fail occasionally" PCI: hv: Add a per-bus mutex state_lock drivers/pci/controller/pci-hyperv.c | 139 ++++++++++++++++------------ 1 file changed, 82 insertions(+), 57 deletions(-)