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linux/virt/kvm/arm
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James Morse 985bf39913 KVM: arm/arm64: Handle CPU_PM_ENTER_FAILED 
commit 58d6b15e9d upstream.

cpu_pm_enter() calls the pm notifier chain with CPU_PM_ENTER, then if
there is a failure: CPU_PM_ENTER_FAILED.

When KVM receives CPU_PM_ENTER it calls cpu_hyp_reset() which will
return us to the hyp-stub. If we subsequently get a CPU_PM_ENTER_FAILED,
KVM does nothing, leaving the CPU running with the hyp-stub, at odds
with kvm_arm_hardware_enabled.

Add CPU_PM_ENTER_FAILED as a fallthrough for CPU_PM_EXIT, this reloads
KVM based on kvm_arm_hardware_enabled. This is safe even if CPU_PM_ENTER
never gets as far as KVM, as cpu_hyp_reinit() calls cpu_hyp_reset()
to make sure the hyp-stub is loaded before reloading KVM.

Fixes: 67f6919766 ("arm64: kvm: allows kvm cpu hotplug")
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2018-02-16 20:23:03 +01:00
..
hyp KVM: arm/arm64: Fix broken GICH_ELRSR big endian conversion 2017-12-14 09:53:01 +01:00
vgic KVM: arm/arm64: vgic-its: Preserve the revious read from the pending table 2017-12-17 15:07:59 +01:00
aarch32.c KVM: arm64: Make kvm_condition_valid32() accessible from EL2 2017-06-15 09:44:58 +01:00
arch_timer.c KVM: arm/arm64: Disallow userspace control of in-kernel IRQ lines 2017-06-08 17:58:40 +02:00
arm.c KVM: arm/arm64: Handle CPU_PM_ENTER_FAILED 2018-02-16 20:23:03 +01:00
mmio.c KVM: Fix stack-out-of-bounds read in write_mmio 2018-01-17 09:45:17 +01:00
mmu.c KVM: arm/arm64: Check pagesize when allocating a hugepage at Stage 2 2018-01-23 19:58:19 +01:00
perf.c KVM: arm/arm64: Move shared files to virt/kvm/arm 2017-05-04 13:57:26 +02:00
pmu.c KVM: arm/arm64: PMU: Fix overflow interrupt injection 2017-07-25 14:18:01 +01:00
psci.c arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support 2018-02-16 20:22:55 +01:00
trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00