diff options
| author | Dongli Zhang <dongli.zhang@oracle.com> | 2021-10-22 16:31:39 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-26 11:58:35 +0100 |
| commit | bad4d45b47886993ac382f25b750771ab2a766f4 (patch) | |
| tree | e51671622471ad53938e54c6c778d70d47ac2810 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | 87cd049467d3eacbf98998cbb24f0b1cebf3606a (diff) | |
xen/netfront: stop tx queues during live migration
[ Upstream commit 042b2046d0f05cf8124c26ff65dbb6148a4404fb ]
The tx queues are not stopped during the live migration. As a result, the
ndo_start_xmit() may access netfront_info->queues which is freed by
talk_to_netback()->xennet_destroy_queues().
This patch is to netif_device_detach() at the beginning of xen-netfront
resuming, and netif_device_attach() at the end of resuming.
CPU A CPU B
talk_to_netback()
-> if (info->queues)
xennet_destroy_queues(info);
to free netfront_info->queues
xennet_start_xmit()
to access netfront_info->queues
-> err = xennet_create_queues(info, &num_queues);
The idea is borrowed from virtio-net.
Cc: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions