Dexuan Cui 55807e7cb0 x86/hyperv: Fix kexec panic/hang issues ... [ Upstream commit dfe94d4086e40e92b1926bddcefa629b791e9b28 ] 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> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-01-27 11:54:57 +01:00
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hv_apic.c	x86/hyperv: Clarify comment on x2apic mode	2020-10-26 16:28:06 +00:00
hv_init.c	x86/hyperv: Fix kexec panic/hang issues	2021-01-27 11:54:57 +01:00
hv_spinlock.c	x86/hyperv: Remove aliases with X64 in their name	2020-09-27 11:34:54 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mmu.c	x86/hyperv: check cpu mask after interrupt has been disabled	2021-01-19 18:27:18 +01:00
nested.c	x86/hyper-v: Add HvFlushGuestAddressList hypercall support	2018-12-21 11:28:39 +01:00