KVM: VMX: Skip delta_tsc shift-and-divide if the dividend is zero (0967fa1c) · Commits · 戴 / test

Ten percent of nothin' is... let me do the math here. Nothin' into nothin', carry the nothin'... Cc: Wanpeng Li <wanpengli@tencent.com> Reviewed-by:

arch/x86/kvm/vmx/vmx.c

+2 −3

Original line number	Original line	Diff line number	Diff line
	@@ -7063,10 +7063,9 @@ static int vmx_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,

	/* Convert to host delta tsc if tsc scaling is enabled */		/* Convert to host delta tsc if tsc scaling is enabled */
	if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio &&		if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio &&
	u64_shl_div_u64(delta_tsc,		delta_tsc && u64_shl_div_u64(delta_tsc,
	kvm_tsc_scaling_ratio_frac_bits,		kvm_tsc_scaling_ratio_frac_bits,
	vcpu->arch.tsc_scaling_ratio,		vcpu->arch.tsc_scaling_ratio, &delta_tsc))
	&delta_tsc))
	return -ERANGE;		return -ERANGE;

	/*		/*