OvmfPkg: Update PlatformPei to support Tdx guest

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

OvmfPkg/PlatformPei is updated to support Tdx guest. There are below
major changes.
 - Set Tdx related PCDs
 - Publish Tdx RamRegions

In this patch there is another new function BuildPlatformInfoHob ().
This function builds EFI_HOB_PLATFORM_INFO which contains the
HostBridgeDevId. The hob is built in both Td guest and Non-Td guest.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 61d7d3059f..2e47b13229 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -37,7 +37,6 @@ Module Name:
 

 #include <Library/QemuFwCfgLib.h>

 #include <Library/QemuFwCfgSimpleParserLib.h>

-

 #include "Platform.h"

 

 VOID

@@ -231,7 +230,12 @@ GetPeiMemoryCap (
     PdpEntries  = 1 << (mPlatformInfoHob.PhysMemAddressWidth - 30);

     ASSERT (PdpEntries <= 0x200);

   } else {

-    Pml4Entries = 1 << (mPlatformInfoHob.PhysMemAddressWidth - 39);

+    if (mPlatformInfoHob.PhysMemAddressWidth > 48) {

+      Pml4Entries = 0x200;

+    } else {

+      Pml4Entries = 1 << (mPlatformInfoHob.PhysMemAddressWidth - 39);

+    }

+

     ASSERT (Pml4Entries <= 0x200);

     PdpEntries = 512;

   }

@@ -354,6 +358,11 @@ InitializeRamRegions (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob

   )

 {

+  if (TdIsEnabled ()) {

+    PlatformTdxPublishRamRegions ();

+    return;

+  }

+

   PlatformQemuInitializeRam (PlatformInfoHob);

 

   SevInitializeRam ();