diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/vhe/switch.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/vhe/switch.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c index 7a1aa511e7da..b37e7c96efea 100644 --- a/arch/arm64/kvm/hyp/vhe/switch.c +++ b/arch/arm64/kvm/hyp/vhe/switch.c @@ -92,14 +92,28 @@ static void __deactivate_traps(struct kvm_vcpu *vcpu) } NOKPROBE_SYMBOL(__deactivate_traps); +/* + * Disable IRQs in {activate,deactivate}_traps_vhe_{load,put}() to + * prevent a race condition between context switching of PMUSERENR_EL0 + * in __{activate,deactivate}_traps_common() and IPIs that attempts to + * update PMUSERENR_EL0. See also kvm_set_pmuserenr(). + */ void activate_traps_vhe_load(struct kvm_vcpu *vcpu) { + unsigned long flags; + + local_irq_save(flags); __activate_traps_common(vcpu); + local_irq_restore(flags); } void deactivate_traps_vhe_put(struct kvm_vcpu *vcpu) { + unsigned long flags; + + local_irq_save(flags); __deactivate_traps_common(vcpu); + local_irq_restore(flags); } static const exit_handler_fn hyp_exit_handlers[] = { |