kvm_mips_ktime_to_count
count = vcpu->arch.count_bias + kvm_mips_ktime_to_count(vcpu, now);
kvm_mips_ktime_to_count(vcpu, before);
now_count = vcpu->arch.count_bias + kvm_mips_ktime_to_count(vcpu, now);
vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now);
vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now);