guest_force_mtrr_state
guest_force_mtrr_state(NULL, 0, MTRR_TYPE_WRBACK);
void guest_force_mtrr_state(struct mtrr_var_range *var, unsigned int num_var,
guest_force_mtrr_state(&pci_hole, 1, MTRR_TYPE_WRBACK);
guest_force_mtrr_state(var, reg, MTRR_TYPE_UNCACHABLE);
guest_force_mtrr_state(NULL, 0, MTRR_TYPE_WRBACK);