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b=ILjqORlQ42ZKWOR4IyhC1vwoph/UZTJh47qs+mIKFXwNTvz0J+/b1BoXKbmXyz+/7Qs9VfZQv/eljIudERVW57SDydHNbu/qRs+EpzyMqOLFR/CClWC0fGIUteV3s4U0f6kpmu5EA7QUuF7C+mWRIuhG/r0hLrSW0I5kslIjPxE= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microsoft.com; Received: from BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) by PH7PR21MB3382.namprd21.prod.outlook.com (2603:10b6:510:1de::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6521.10; Thu, 15 Jun 2023 04:45:40 +0000 Received: from BL0PR2101MB1092.namprd21.prod.outlook.com ([fe80::e673:bfeb:d3c1:7682]) by BL0PR2101MB1092.namprd21.prod.outlook.com ([fe80::e673:bfeb:d3c1:7682%3]) with mapi id 15.20.6521.009; Thu, 15 Jun 2023 04:45:40 +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, stable@vger.kernel.org Subject: [PATCH v4 2/5] PCI: hv: Fix a race condition in hv_irq_unmask() that can cause panic Date: Wed, 14 Jun 2023 21:44:48 -0700 Message-Id: <20230615044451.5580-3-decui@microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230615044451.5580-1-decui@microsoft.com> References: <20230615044451.5580-1-decui@microsoft.com> X-ClientProxiedBy: CYZPR17CA0016.namprd17.prod.outlook.com (2603:10b6:930:8c::25) To BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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: 51762adb-e74f-476a-08ef-08db6d5b5e87 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 51762adb-e74f-476a-08ef-08db6d5b5e87 X-MS-Exchange-CrossTenant-AuthSource: BL0PR2101MB1092.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jun 2023 04:45:39.9982 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: PiboE7hAa4C4GRVPTbTLdacuh6GorxpMadwtxmFK3yIzEtgDaO4QDOnpvB6kBj2CP7L5dS0E5G6m8BoSov7+MA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR21MB3382 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net When the host tries to remove a PCI device, the host first sends a PCI_EJECT message to the guest, and the guest is supposed to gracefully remove the PCI device and send a PCI_EJECTION_COMPLETE message to the host; the host then sends a VMBus message CHANNELMSG_RESCIND_CHANNELOFFER to the guest (when the guest receives this message, the device is already unassigned from the guest) and the guest can do some final cleanup work; if the guest fails to respond to the PCI_EJECT message within one minute, the host sends the VMBus message CHANNELMSG_RESCIND_CHANNELOFFER and removes the PCI device forcibly. In the case of fast device addition/removal, it's possible that the PCI device driver is still configuring MSI-X interrupts when the guest receives the PCI_EJECT message; the channel callback calls hv_pci_eject_device(), which sets hpdev->state to hv_pcichild_ejecting, and schedules a work hv_eject_device_work(); if the PCI device driver is calling pci_alloc_irq_vectors() -> ... -> hv_compose_msi_msg(), we can break the while loop in hv_compose_msi_msg() due to the updated hpdev->state, and leave data->chip_data with its default value of NULL; later, when the PCI device driver calls request_irq() -> ... -> hv_irq_unmask(), the guest crashes in hv_arch_irq_unmask() due to data->chip_data being NULL. Fix the issue by not testing hpdev->state in the while loop: when the guest receives PCI_EJECT, the device is still assigned to the guest, and the guest has one minute to finish the device removal gracefully. We don't really need to (and we should not) test hpdev->state in the loop. Fixes: de0aa7b2f97d ("PCI: hv: Fix 2 hang issues in hv_compose_msi_msg()") Signed-off-by: Dexuan Cui Reviewed-by: Michael Kelley Cc: stable@vger.kernel.org --- v2: Removed the "debug code". No change to the patch body. Added Cc:stable v3: Added Michael's Reviewed-by. v4: No change since v3. drivers/pci/controller/pci-hyperv.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index ea8862e656b68..733637d967654 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -635,6 +635,11 @@ static void hv_arch_irq_unmask(struct irq_data *data) pbus = pdev->bus; hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata); int_desc = data->chip_data; + if (!int_desc) { + dev_warn(&hbus->hdev->device, "%s() can not unmask irq %u\n", + __func__, data->irq); + return; + } local_irq_save(flags); @@ -2004,12 +2009,6 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) hv_pci_onchannelcallback(hbus); spin_unlock_irqrestore(&channel->sched_lock, flags); - if (hpdev->state == hv_pcichild_ejecting) { - dev_err_once(&hbus->hdev->device, - "the device is being ejected\n"); - goto enable_tasklet; - } - udelay(100); }