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Do not expose the ACPI power management "_PS0/3" Method to guest firmware. According to section 3.4 of the APCI specification 4.0, PCI device control the device power through its own specification but not through APCI. Qemu pushes "_PS0/3" to guest will cause a mess between ACPI PM and PCI PM as a result of incorrect ACPI table shipped with the guest BIOS, it may cause a failure of PCI device PM state transition(from PCI_UNKNOWN to PCI_D0). Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Haitao Shan <haitao.shan@intel.com> Committed-by: Keir Fraser <keir@xen.org>