Re: [edk2] [PATCH 11/17] OvmfPkg: PciHostBridgeLib: clear RootBus->DmaAbove4G

2016-02-26 Thread Ni, Ruiyu
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

[edk2] [PATCH 11/17] OvmfPkg: PciHostBridgeLib: clear RootBus->DmaAbove4G

2016-02-26 Thread Laszlo Ersek
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