KVM_LARCH_HWCSR_USABLE
vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
if (vcpu->arch.aux_inuse & KVM_LARCH_HWCSR_USABLE)
vcpu->arch.aux_inuse |= KVM_LARCH_HWCSR_USABLE;