ect: [edk2] [PATCH 11/17] OvmfPkg: PciHostBridgeLib: clear
>RootBus->DmaAbove4G
>
>When this BOOLEAN member is FALSE, and the caller tries to set up a DMA
>transfer between a PCI device and a host buffer not entirely under 4GB,
>then "MdeModulePkg/Bus/Pci/PciHostBridgeDxe" sets
When this BOOLEAN member is FALSE, and the caller tries to set up a DMA
transfer between a PCI device and a host buffer not entirely under 4GB,
then "MdeModulePkg/Bus/Pci/PciHostBridgeDxe" sets up a bounce buffer under
4GB, in the implementation of EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Map().
Since that
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