acpi_piix4: expose no_hotplug attribute via i/o port
Expose no_hotplug attribute via I/O port, so ACPI BIOS can indicate removability status to guest OS. An updated seabios is required to make use of this feature (seabios.git commit ID 3c241edf3d7ef29c21). Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Tested-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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