Va. Code § 24.2-304.4
Whenever the governing body of any county, city or town fails to perform the duty of reapportioning the representation on the governing body among the districts or wards of the county, city, or town, or fails to change the boundaries of districts or wards, as prescribed by law, mandamus shall lie in favor of any citizen of such county, city, or town, to compel the performance of such duty.
Whenever the governing body of any county, city or town changes the boundaries, or increases or diminishes the number of districts or wards, or reapportions the representation in the governing body as prescribed by law, the action shall not be subject to judicial review, unless it is alleged that the representation is not proportional to the population of the district or ward. If such allegation is made in a bill of complaint filed in the circuit court for the county, city or town, the court shall determine whether the action of the governing body complies with the constitutional requirements for redistricting and reapportionment. Appeals from the court's decision shall be as in any other suit.
Va. Code § 24.2-304.4