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Dexuan Cui dfe94d4086 x86/hyperv: Fix kexec panic/hang issues 
Currently the kexec kernel can panic or hang due to 2 causes:

1) hv_cpu_die() is not called upon kexec, so the hypervisor corrupts the
old VP Assist Pages when the kexec kernel runs. The same issue is fixed
for hibernation in commit 421f090c81 ("x86/hyperv: Suspend/resume the
VP assist page for hibernation"). Now fix it for kexec.

2) hyperv_cleanup() is called too early. In the kexec path, the other CPUs
are stopped in hv_machine_shutdown() -> native_machine_shutdown(), so
between hv_kexec_handler() and native_machine_shutdown(), the other CPUs
can still try to access the hypercall page and cause panic. The workaround
"hv_hypercall_pg = NULL;" in hyperv_cleanup() is unreliabe. Move
hyperv_cleanup() to a better place.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20201222065541.24312-1-decui@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
 		2021-01-05 17:52:04 +00:00
..
Kconfig clocksource/drivers/hyperv: Enable TSC page clocksource on 32bit 2019-08-23 16:59:54 +02:00
Makefile drivers: hv: vmbus: Introduce latency testing 2019-11-21 20:10:44 -05:00
channel.c Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening 2020-11-17 10:51:06 +00:00
channel_mgmt.c hyperv-fixes for 5.9-rc6 2020-09-15 16:20:43 -07:00
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 hv_balloon: do adjust_managed_page_count() when ballooning/un-ballooning 2020-12-13 15:06:10 +00:00
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: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_trace.h hyperv-next for 5.8 2020-06-03 15:00:05 -07:00
hv_trace_balloon.h hv_balloon: trace post_status 2018-03-06 09:57:17 -08:00
hv_util.c hyperv-next for 5.10 2020-10-14 10:32:10 -07:00
hv_utils_transport.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_utils_transport.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hyperv_vmbus.h drivers/hv: remove obsolete TODO and fix misleading typo in comment 2020-12-07 11:24:08 +00:00
ring_buffer.c Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening 2020-11-17 10:51:06 +00:00
vmbus_drv.c x86/hyperv: Fix kexec panic/hang issues 2021-01-05 17:52:04 +00:00