[PATCH 1/3] OvmfPkg/PlatformInitLib: Differentiate TDX case for Cloud Hypervisor

["Boeuf, Sebastien" <sebastien.boeuf@intel.com>]

From: Sebastien Boeuf <sebastien.boeuf@intel.com>

Rely on the CcProbe() function to identify when running on TDX. This
allows the firmware to follow a different codepath for Cloud Hypervisor,
which means it doesn't rely on PVH to find out about memory below 4GiB.
instead it falls back onto the CMOS to retrieve that information.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
---
 OvmfPkg/Library/PlatformInitLib/MemDetect.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
index b8feae4309..afee4b1e72 100644
--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
@@ -26,6 +26,7 @@ Module Name:
 //
 #include <Library/BaseLib.h>
 #include <Library/BaseMemoryLib.h>
+#include <Library/CcProbeLib.h>
 #include <Library/DebugLib.h>
 #include <Library/HardwareInfoLib.h>
 #include <Library/HobLib.h>
@@ -312,7 +313,8 @@ PlatformGetSystemMemorySizeBelow4gb (
   UINT8       Cmos0x34;
   UINT8       Cmos0x35;
 
-  if (PlatformInfoHob->HostBridgeDevId == CLOUDHV_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == CLOUDHV_DEVICE_ID &&
+      CcProbe () != CcGuestTypeIntelTdx) {
     // Get the information from PVH memmap
     return (UINT32)GetHighestSystemMemoryAddressFromPvhMemmap (TRUE);
   }
-- 
2.34.1

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