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's exactly what RootBridgeIoMap() does in
"OvmfPkg/PciHostBridgeDxe/PciRootBridgeIo.c", stick with it in this
conversion.
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Ruiyu Ni <ruiyu...@intel.com>
Cc: Marcel Apfelbaum <mar...@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
Reviewed-by: Ruiyu Ni <ruiyu...@intel.com>
Reviewed-by: Jordan Justen <jordan.l.jus...@intel.com>
---
OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c
b/OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c
index db260291b822..f1cefe416996 100644
--- a/OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c
+++ b/OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c
@@ -82,6 +82,8 @@ InitRootBridge (
EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;
RootBus->Attributes = RootBus->Supports;
+ RootBus->DmaAbove4G = FALSE;
+
return EFI_OUT_OF_RESOURCES;
}
--
1.8.3.1
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