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Wed, 22 Nov 2023 13:26:19 -0600 From: Brett Creeley To: , , , , , , CC: , Subject: [PATCH v4 vfio 1/2] vfio/pds: Fix mutex lock->magic != lock warning Date: Wed, 22 Nov 2023 11:25:31 -0800 Message-ID: <20231122192532.25791-2-brett.creeley@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231122192532.25791-1-brett.creeley@amd.com> References: <20231122192532.25791-1-brett.creeley@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F9:EE_|SJ0PR12MB8091:EE_ X-MS-Office365-Filtering-Correlation-Id: cf7b33fb-0c08-4219-bd36-08dbeb90e9b0 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:;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(396003)(376002)(136003)(39860400002)(346002)(230922051799003)(451199024)(186009)(1800799012)(64100799003)(82310400011)(46966006)(36840700001)(40470700004)(40460700003)(426003)(336012)(83380400001)(26005)(36860700001)(16526019)(8676002)(4326008)(47076005)(41300700001)(44832011)(5660300002)(2906002)(478600001)(8936002)(54906003)(70586007)(110136005)(81166007)(36756003)(70206006)(6666004)(316002)(1076003)(82740400003)(356005)(2616005)(86362001)(40480700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Nov 2023 19:26:22.9205 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cf7b33fb-0c08-4219-bd36-08dbeb90e9b0 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: CO1PEPF000044F9.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB8091 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Wed, 22 Nov 2023 11:26:30 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783293488130605375 X-GMAIL-MSGID: 1783293488130605375 The following BUG was found when running on a kernel with CONFIG_DEBUG_MUTEXES=y set: DEBUG_LOCKS_WARN_ON(lock->magic != lock) RIP: 0010:mutex_trylock+0x10d/0x120 Call Trace: ? __warn+0x85/0x140 ? mutex_trylock+0x10d/0x120 ? report_bug+0xfc/0x1e0 ? handle_bug+0x3f/0x70 ? exc_invalid_op+0x17/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? mutex_trylock+0x10d/0x120 ? mutex_trylock+0x10d/0x120 pds_vfio_reset+0x3a/0x60 [pds_vfio_pci] pci_reset_function+0x4b/0x70 reset_store+0x5b/0xa0 kernfs_fop_write_iter+0x137/0x1d0 vfs_write+0x2de/0x410 ksys_write+0x5d/0xd0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 As shown, lock->magic != lock. This is because mutex_init(&pds_vfio->state_mutex) is called in the VFIO open path. So, if a reset is initiated before the VFIO device is opened the mutex will have never been initialized. Fix this by calling mutex_init(&pds_vfio->state_mutex) in the VFIO init path. Also, don't destroy the mutex on close because the device may be re-opened, which would cause mutex to be uninitialized. Fix this by implementing a driver specific vfio_device_ops.release callback that destroys the mutex before calling vfio_pci_core_release_dev(). Fixes: bb500dbe2ac6 ("vfio/pds: Add VFIO live migration support") Signed-off-by: Brett Creeley Reviewed-by: Shannon Nelson --- drivers/vfio/pci/pds/vfio_dev.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c index 649b18ee394b..8c9fb87b13e1 100644 --- a/drivers/vfio/pci/pds/vfio_dev.c +++ b/drivers/vfio/pci/pds/vfio_dev.c @@ -155,6 +155,8 @@ static int pds_vfio_init_device(struct vfio_device *vdev) pds_vfio->vf_id = vf_id; + mutex_init(&pds_vfio->state_mutex); + vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P; vdev->mig_ops = &pds_vfio_lm_ops; vdev->log_ops = &pds_vfio_log_ops; @@ -168,6 +170,16 @@ static int pds_vfio_init_device(struct vfio_device *vdev) return 0; } +static void pds_vfio_release_device(struct vfio_device *vdev) +{ + struct pds_vfio_pci_device *pds_vfio = + container_of(vdev, struct pds_vfio_pci_device, + vfio_coredev.vdev); + + mutex_destroy(&pds_vfio->state_mutex); + vfio_pci_core_release_dev(vdev); +} + static int pds_vfio_open_device(struct vfio_device *vdev) { struct pds_vfio_pci_device *pds_vfio = @@ -179,7 +191,6 @@ static int pds_vfio_open_device(struct vfio_device *vdev) if (err) return err; - mutex_init(&pds_vfio->state_mutex); pds_vfio->state = VFIO_DEVICE_STATE_RUNNING; pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING; @@ -199,14 +210,13 @@ static void pds_vfio_close_device(struct vfio_device *vdev) pds_vfio_put_save_file(pds_vfio); pds_vfio_dirty_disable(pds_vfio, true); mutex_unlock(&pds_vfio->state_mutex); - mutex_destroy(&pds_vfio->state_mutex); vfio_pci_core_close_device(vdev); } static const struct vfio_device_ops pds_vfio_ops = { .name = "pds-vfio", .init = pds_vfio_init_device, - .release = vfio_pci_core_release_dev, + .release = pds_vfio_release_device, .open_device = pds_vfio_open_device, .close_device = pds_vfio_close_device, .ioctl = vfio_pci_core_ioctl, From patchwork Wed Nov 22 19:25:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brett Creeley X-Patchwork-Id: 168530 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:612c:2b07:b0:403:3b70:6f57 with SMTP id io7csp1560055vqb; Wed, 22 Nov 2023 11:27:12 -0800 (PST) X-Google-Smtp-Source: AGHT+IH8k06hy9bqqm6tfQx0reK7K1/zP3sgYLrj/TFDxKVxgRJVvs8eSRoykc5jQoyX4EPMp552 X-Received: by 2002:a05:6a20:2c91:b0:187:ce9f:e198 with SMTP id g17-20020a056a202c9100b00187ce9fe198mr2812472pzj.5.1700681232213; Wed, 22 Nov 2023 11:27:12 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1700681232; cv=pass; d=google.com; s=arc-20160816; b=oSuz56G1AKSBM8O5vF6eNlHeej7kdD7EzVd1ojJY/LFpF19oUhycYRuqJjap9clNAw mDBvX/1hR3EtXx5kILeAW69HHubixR5T2lvCGkZzhSeNAFS+uyvJoxqEp+0vzLNQxN4t yDRvRgjng/0Z/HfTOIhKahTrnOBMDMunvYdPbT1+dqrYmxjG3LOaXbcjGkDxgEw0ZcNQ nlbexLT2v+NGBYgyyqqA+F/PMZof2dO8onrHZ7bxwoVQbXf0E5p3N2V2GnEarUWkKTOT 6KaElku2gq1v5iNC/tg+JuiOf6uf49j0FfZtKcMzdug6Skpu+pxOYHova+4KlOW454oA IVbw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=x+POrHr8Ptzol7KDt+CLjOPxLwvrOnmwo/dWZrXzkNo=; fh=lBBaLJko1QugYzFKdQRCcg/1umbDT+qI/sM7W6WplGU=; b=hkoBL7Q5EQlZvoXg+oQufFsjp2V1vbojj4nDv5KZUcSUYr3nuu9ZuOwCuxiDtXND9K eScUIyxoSH3kn0Nlqrex3VufbGPmbGdBYEv+T6Ulaf4U6E0bucIsNEgovZgB+FFidu5z fwMlrCxIv+C9K4/Sz4IKzvxyc+WDyoyzYgHlX0qplc8C2wtuxogIR3sMy2Tx3cyY8Ua5 Asau6b8Yz53RB5e/e63PtnE3c6fb/bbJz9PXQrqgjSX54SonbsiNES9yyEuI9vk04vM2 UHmHBcPCo37t9kvzu3vB1U0/pemvtE/524roZkPGV7JuQBRNG1rgOCGwC62FwfYf7eka qgdA== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@amd.com header.s=selector1 header.b=oR3lbTYB; arc=pass (i=1 spf=pass spfdomain=amd.com dmarc=pass fromdomain=amd.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:8 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amd.com Received: from fry.vger.email (fry.vger.email. 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Wed, 22 Nov 2023 13:26:26 -0600 From: Brett Creeley To: , , , , , , CC: , Subject: [PATCH v4 vfio 2/2] vfio/pds: Fix possible sleep while in atomic context Date: Wed, 22 Nov 2023 11:25:32 -0800 Message-ID: <20231122192532.25791-3-brett.creeley@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231122192532.25791-1-brett.creeley@amd.com> References: <20231122192532.25791-1-brett.creeley@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044FA:EE_|IA1PR12MB6626:EE_ X-MS-Office365-Filtering-Correlation-Id: ecb28c72-0732-4691-f2f1-08dbeb90ed3a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: MgxYT26qG6ehhX+LECMxBPAcDG6VDutkVFFQyKZ+hkKdfDacCmhPU3PeRKkOqk9xFIJ96g2IAoUXb2tGfmVS9V5fI2vH+w1zT36LbbanvRoxiLDrE9ZA1sZBt2hhCaY7oWJMSlowVymF/gMy8pMPwUhYjTscFEJR2nsrL5vG8L2bDF6FNgiyHBjcPCkk49vRmoAj0hkkfZgRWZPDIgBh3kB4z7JfdaSY9FSv2fgsLX31r8AgXZ1QHac7uHLcek/M125FTqnys2nBhw1sKZAzZA6zjZzrTU/jIxJYwvEorT/Ae58ilI+2dCU2FVgpBYBEZzqwBKRoco6Mv7VfMEfSj2dFE2k9FZ2eKRIe/5d+KeFPwhSZLOD/dK7Y08liyELaK0PKfzdm0TkBvAT+zJiNWOaHf3/zHDeLf+yyBWHK9TkNJXAAaute04489aJ1QG9BvAZ/DVhBk7DLfliBXleX9KY/tKQYgSMcifhOOQ/9MQf5UwOvowvjqNSAvsT5EtDX72WXHdBj4UbK60f/HKa7FIGBqGRq4ztV5UmCl1eMHcfLOY0Cn5Pt/17Ptbxfe4QveLOwcVyIuQSzYOvR0IG8lJLQvsaZhRJJMu2b++bjI44AI0dtn2FNFjnIr1/U34T1uN0hXDo46htHdBJD28qzaynuFXyV8bK2Iz0NK6VmlVdsbDiimDsW7Sdu7p+PGyIcCvd0ck2FHsw3w7QWFuzPZgwYI8g6U/N+ENRhku4WXsQ= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(376002)(396003)(136003)(346002)(39860400002)(230922051799003)(64100799003)(451199024)(1800799012)(82310400011)(186009)(40470700004)(46966006)(36840700001)(2616005)(426003)(336012)(16526019)(1076003)(26005)(36860700001)(356005)(81166007)(36756003)(86362001)(82740400003)(83380400001)(40460700003)(47076005)(54906003)(316002)(4326008)(8676002)(8936002)(70586007)(70206006)(110136005)(41300700001)(44832011)(5660300002)(2906002)(6666004)(40480700001)(966005)(478600001)(36900700001);DIR:OUT;SFP:1101; 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Wed, 22 Nov 2023 11:27:09 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783293523579704467 X-GMAIL-MSGID: 1783293523579704467 The driver could possibly sleep while in atomic context resulting in the following call trace while CONFIG_DEBUG_ATOMIC_SLEEP=y is set: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:283 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2817, name: bash preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 Call Trace: dump_stack_lvl+0x36/0x50 __might_resched+0x123/0x170 mutex_lock+0x1e/0x50 pds_vfio_put_lm_file+0x1e/0xa0 [pds_vfio_pci] pds_vfio_put_save_file+0x19/0x30 [pds_vfio_pci] pds_vfio_state_mutex_unlock+0x2e/0x80 [pds_vfio_pci] pci_reset_function+0x4b/0x70 reset_store+0x5b/0xa0 kernfs_fop_write_iter+0x137/0x1d0 vfs_write+0x2de/0x410 ksys_write+0x5d/0xd0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 This can happen if pds_vfio_put_restore_file() and/or pds_vfio_put_save_file() grab the mutex_lock(&lm_file->lock) while the spin_lock(&pds_vfio->reset_lock) is held, which can happen during while calling pds_vfio_state_mutex_unlock(). Fix this by changing the reset_lock to reset_mutex so there are no such conerns. Also, make sure to destroy the reset_mutex in the driver specific VFIO device release function. This also fixes a spinlock bad magic BUG that was caused by not calling spinlock_init() on the reset_lock. Since, the lock is being changed to a mutex, make sure to call mutex_init() on it. Reported-by: Dan Carpenter Closes: https://lore.kernel.org/kvm/1f9bc27b-3de9-4891-9687-ba2820c1b390@moroto.mountain/ Fixes: bb500dbe2ac6 ("vfio/pds: Add VFIO live migration support") Signed-off-by: Brett Creeley Reviewed-by: Shannon Nelson --- drivers/vfio/pci/pds/pci_drv.c | 4 ++-- drivers/vfio/pci/pds/vfio_dev.c | 14 ++++++++------ drivers/vfio/pci/pds/vfio_dev.h | 2 +- 3 files changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c index ab4b5958e413..caffa1a2cf59 100644 --- a/drivers/vfio/pci/pds/pci_drv.c +++ b/drivers/vfio/pci/pds/pci_drv.c @@ -55,10 +55,10 @@ static void pds_vfio_recovery(struct pds_vfio_pci_device *pds_vfio) * VFIO_DEVICE_STATE_RUNNING. */ if (deferred_reset_needed) { - spin_lock(&pds_vfio->reset_lock); + mutex_lock(&pds_vfio->reset_mutex); pds_vfio->deferred_reset = true; pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_ERROR; - spin_unlock(&pds_vfio->reset_lock); + mutex_unlock(&pds_vfio->reset_mutex); } } diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c index 8c9fb87b13e1..4c351c59d05a 100644 --- a/drivers/vfio/pci/pds/vfio_dev.c +++ b/drivers/vfio/pci/pds/vfio_dev.c @@ -29,7 +29,7 @@ struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev) void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio) { again: - spin_lock(&pds_vfio->reset_lock); + mutex_lock(&pds_vfio->reset_mutex); if (pds_vfio->deferred_reset) { pds_vfio->deferred_reset = false; if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) { @@ -39,23 +39,23 @@ void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio) } pds_vfio->state = pds_vfio->deferred_reset_state; pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING; - spin_unlock(&pds_vfio->reset_lock); + mutex_unlock(&pds_vfio->reset_mutex); goto again; } mutex_unlock(&pds_vfio->state_mutex); - spin_unlock(&pds_vfio->reset_lock); + mutex_unlock(&pds_vfio->reset_mutex); } void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio) { - spin_lock(&pds_vfio->reset_lock); + mutex_lock(&pds_vfio->reset_mutex); pds_vfio->deferred_reset = true; pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING; if (!mutex_trylock(&pds_vfio->state_mutex)) { - spin_unlock(&pds_vfio->reset_lock); + mutex_unlock(&pds_vfio->reset_mutex); return; } - spin_unlock(&pds_vfio->reset_lock); + mutex_unlock(&pds_vfio->reset_mutex); pds_vfio_state_mutex_unlock(pds_vfio); } @@ -156,6 +156,7 @@ static int pds_vfio_init_device(struct vfio_device *vdev) pds_vfio->vf_id = vf_id; mutex_init(&pds_vfio->state_mutex); + mutex_init(&pds_vfio->reset_mutex); vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P; vdev->mig_ops = &pds_vfio_lm_ops; @@ -177,6 +178,7 @@ static void pds_vfio_release_device(struct vfio_device *vdev) vfio_coredev.vdev); mutex_destroy(&pds_vfio->state_mutex); + mutex_destroy(&pds_vfio->reset_mutex); vfio_pci_core_release_dev(vdev); } diff --git a/drivers/vfio/pci/pds/vfio_dev.h b/drivers/vfio/pci/pds/vfio_dev.h index b8f2d667608f..e7b01080a1ec 100644 --- a/drivers/vfio/pci/pds/vfio_dev.h +++ b/drivers/vfio/pci/pds/vfio_dev.h @@ -18,7 +18,7 @@ struct pds_vfio_pci_device { struct pds_vfio_dirty dirty; struct mutex state_mutex; /* protect migration state */ enum vfio_device_mig_state state; - spinlock_t reset_lock; /* protect reset_done flow */ + struct mutex reset_mutex; /* protect reset_done flow */ u8 deferred_reset; enum vfio_device_mig_state deferred_reset_state; struct notifier_block nb;