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For pass-thru dev PIO bar,ensure it's identical mapping (guest PIO bar start address equals to host PIO bar start address). Then in HV side, set the corresponding VMCS io bitmap to pass-thru these io ports for performance. Tracked-On: #6508 Signed-off-by: Fei Li <fei1.li@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>