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Michael Kelley 8b4d4bd1f1 Drivers: hv: vmbus: Increase wait time for VMbus unload 
[ Upstream commit 77db0ec8b7 ]

When running in Azure, disks may be connected to a Linux VM with
read/write caching enabled. If a VM panics and issues a VMbus
UNLOAD request to Hyper-V, the response is delayed until all dirty
data in the disk cache is flushed.  In extreme cases, this flushing
can take 10's of seconds, depending on the disk speed and the amount
of dirty data. If kdump is configured for the VM, the current 10 second
timeout in vmbus_wait_for_unload() may be exceeded, and the UNLOAD
complete message may arrive well after the kdump kernel is already
running, causing problems.  Note that no problem occurs if kdump is
not enabled because Hyper-V waits for the cache flush before doing
a reboot through the BIOS/UEFI code.

Fix this problem by increasing the timeout in vmbus_wait_for_unload()
to 100 seconds. Also output periodic messages so that if anyone is
watching the serial console, they won't think the VM is completely
hung.

Fixes: 911e1987ef ("Drivers: hv: vmbus: Add timeout to vmbus_wait_for_unload")
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/1618894089-126662-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-14 09:50:21 +02:00
..
channel.c Drivers: hv: vmbus: Use after free in __vmbus_open() 2021-05-14 09:50:20 +02:00
channel_mgmt.c Drivers: hv: vmbus: Increase wait time for VMbus unload 2021-05-14 09:50:21 +02:00
connection.c Drivers: hv: vmbus: Replace the per-CPU channel lists with a global array of channels 2020-04-23 13:17:11 +00:00
hv.c hyperv-fixes for 5.10-rc5 2020-11-16 15:02:33 -08:00
hv_balloon.c hyperv-fixes for 5.10-rc3 2020-11-05 11:32:03 -08:00
hv_debugfs.c hv_debugfs: Make hv_debug_root static 2020-04-04 17:47:43 +01:00
hv_fcopy.c hv_utils: Always execute the fcopy and vss callbacks in a tasklet 2020-04-23 13:17:11 +00:00
hv_kvp.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hv_snapshot.c hv_utils: Always execute the fcopy and vss callbacks in a tasklet 2020-04-23 13:17:11 +00:00
hv_trace.c
hv_trace.h hyperv-next for 5.8 2020-06-03 15:00:05 -07:00
hv_trace_balloon.h
hv_util.c hyperv-next for 5.10 2020-10-14 10:32:10 -07:00
hv_utils_transport.c
hv_utils_transport.h
hyperv_vmbus.h Drivers: hv: vmbus: Resolve more races involving init_vp_index() 2020-05-23 09:07:00 +00:00
Kconfig
Makefile drivers: hv: vmbus: Introduce latency testing 2019-11-21 20:10:44 -05:00
ring_buffer.c drivers: hv: vmbus: Introduce latency testing 2019-11-21 20:10:44 -05:00
vmbus_drv.c x86/hyperv: Fix kexec panic/hang issues 2021-01-27 11:54:57 +01:00