From: Parav Pandit via Virtualization <virtualization@lists.linux-foundation.org>
To: <mst@redhat.com>, <virtualization@lists.linux-foundation.org>
Subject: [PATCH v3 4/4] virtio_pci: Support surprise removal of virtio pci device
Date: Wed, 21 Jul 2021 17:26:48 +0300 [thread overview]
Message-ID: <20210721142648.1525924-5-parav@nvidia.com> (raw)
In-Reply-To: <20210721142648.1525924-1-parav@nvidia.com>
When a virtio pci device undergo surprise removal (aka async removal in
PCIe spec), mark the device as broken so that any upper layer drivers can
abort any outstanding operation.
When a virtio net pci device undergo surprise removal which is used by a
NetworkManager, a below call trace was observed.
kernel:watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [kworker/1:1:27059]
watchdog: BUG: soft lockup - CPU#1 stuck for 52s! [kworker/1:1:27059]
CPU: 1 PID: 27059 Comm: kworker/1:1 Tainted: G S W I L 5.13.0-hotplug+ #8
Hardware name: Dell Inc. PowerEdge R640/0H28RR, BIOS 2.9.4 11/06/2020
Workqueue: events linkwatch_event
RIP: 0010:virtnet_send_command+0xfc/0x150 [virtio_net]
Call Trace:
virtnet_set_rx_mode+0xcf/0x2a7 [virtio_net]
? __hw_addr_create_ex+0x85/0xc0
__dev_mc_add+0x72/0x80
igmp6_group_added+0xa7/0xd0
ipv6_mc_up+0x3c/0x60
ipv6_find_idev+0x36/0x80
addrconf_add_dev+0x1e/0xa0
addrconf_dev_config+0x71/0x130
addrconf_notify+0x1f5/0xb40
? rtnl_is_locked+0x11/0x20
? __switch_to_asm+0x42/0x70
? finish_task_switch+0xaf/0x2c0
? raw_notifier_call_chain+0x3e/0x50
raw_notifier_call_chain+0x3e/0x50
netdev_state_change+0x67/0x90
linkwatch_do_dev+0x3c/0x50
__linkwatch_run_queue+0xd2/0x220
linkwatch_event+0x21/0x30
process_one_work+0x1c8/0x370
worker_thread+0x30/0x380
? process_one_work+0x370/0x370
kthread+0x118/0x140
? set_kthread_struct+0x40/0x40
ret_from_fork+0x1f/0x30
Hence, add the ability to abort the command on surprise removal
which prevents infinite loop and system lockup.
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
changelog:
v0->v1:
- fixed typo in comment
---
drivers/virtio/virtio_pci_common.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 222d630c41fc..b35bb2d57f62 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -576,6 +576,13 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct device *dev = get_device(&vp_dev->vdev.dev);
+ /*
+ * Device is marked broken on surprise removal so that virtio upper
+ * layers can abort any ongoing operation.
+ */
+ if (!pci_device_is_present(pci_dev))
+ virtio_break_device(&vp_dev->vdev);
+
pci_disable_sriov(pci_dev);
unregister_virtio_device(&vp_dev->vdev);
--
2.27.0
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next prev parent reply other threads:[~2021-07-21 14:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 14:26 [PATCH v3 0/4] virtio short improvements Parav Pandit via Virtualization
2021-07-21 14:26 ` [PATCH v3 1/4] virtio: Improve vq->broken access to avoid any compiler optimization Parav Pandit via Virtualization
2021-07-21 14:26 ` [PATCH v3 2/4] virtio: Keep vring_del_virtqueue() mirror of VQ create Parav Pandit via Virtualization
2021-07-21 14:26 ` [PATCH v3 3/4] virtio: Protect vqs list access Parav Pandit via Virtualization
2021-07-21 14:26 ` Parav Pandit via Virtualization [this message]
2021-07-29 4:39 ` [PATCH v3 0/4] virtio short improvements Parav Pandit via Virtualization
2021-08-03 2:30 ` Parav Pandit via Virtualization
2021-08-09 7:33 ` Parav Pandit via Virtualization
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