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The port 0x64 is the status register of i8042 keyboard controller. When i8042 is defined as ACPI PnP device in BIOS, enforce returning 0xff in read handler would cause infinite loop when booting SOS VM, so expose the physical port read in this case; Tracked-On: #4228 Signed-off-by: Victor Sun <victor.sun@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>