static int xen_pt_pmcsr_reg_write(XenPCIPassthroughState *s,

                                  XenPTReg *cfg_entry, uint16_t *val,

                                  uint16_t dev_value, uint16_t valid_mask)

{

    XenPTRegInfo *reg = cfg_entry->reg;

    uint16_t writable_mask = 0;

    uint16_t throughable_mask = get_throughable_mask(s, reg, valid_mask);



    /* modify emulate register */

    writable_mask = reg->emu_mask & ~reg->ro_mask & valid_mask;

    cfg_entry->data = XEN_PT_MERGE_VALUE(*val, cfg_entry->data, writable_mask);



    /* create value for writing to I/O device register */

    *val = XEN_PT_MERGE_VALUE(*val, dev_value & ~PCI_PM_CTRL_PME_STATUS,

                              throughable_mask);



    return 0;

}
