[SeaBIOS] [edk2 PATCH 3/3] OvmfPkg/AcpiPlatformDxe: support 64-bit zone in ALLOCATE command

[Laszlo Ersek]

The QemuLoaderAlloc64Bit (3) Zone value permits the guest firmware to
allocate the blob being downloaded anywhere in the 64-bit address space.
Set the maximum Address value in ProcessCmdAllocate() accordingly.

Cc: "Michael S. Tsirkin" 
Cc: Ard Biesheuvel 
Cc: Ben Warren 
Cc: Dongjiu Geng 
Cc: Igor Mammedov 
Cc: Jordan Justen 
Cc: Leif Lindholm 
Cc: Shannon Zhao 
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek 
---
 OvmfPkg/AcpiPlatformDxe/QemuLoader.h    | 3 ++-
 OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/AcpiPlatformDxe/QemuLoader.h b/OvmfPkg/AcpiPlatformDxe/QemuLoader.h
index fa558540e62b..1daa918ff9b7 100644
--- a/OvmfPkg/AcpiPlatformDxe/QemuLoader.h
+++ b/OvmfPkg/AcpiPlatformDxe/QemuLoader.h
@@ -31,11 +31,12 @@ typedef enum {
   QemuLoaderCmdWritePointer,
 } QEMU_LOADER_COMMAND_TYPE;

typedef enum {
   QemuLoaderAllocHigh = 1,
-  QemuLoaderAllocFSeg
+  QemuLoaderAllocFSeg,
+  QemuLoaderAlloc64Bit,
 } QEMU_LOADER_ALLOC_ZONE;

typedef enum {
   QemuLoaderAllocContentMixed  = 0x00,
   QemuLoaderAllocContentNoAcpi = 0x80,
diff --git a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
index 23d543ffe361..0b0b3f590f2b 100644
--- a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
+++ b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
@@ -202,11 +202,11 @@ ProcessCmdAllocate (
   } else {
     AcpiTablesExcluded = FALSE;
   }

NumPages = EFI_SIZE_TO_PAGES (FwCfgSize);
-  Address = 0xFFFFFFFF;
+  Address = (Zone == QemuLoaderAlloc64Bit) ? MAX_UINT64 : MAX_UINT32;
   Status = gBS->AllocatePages (AllocateMaxAddress, EfiACPIMemoryNVS, NumPages,
                   &Address);
   if (EFI_ERROR (Status)) {
     return Status;
   }