OvmfPkg: Retrieve SMBIOS from Cloud Hypervisor

Add a fallback on the SMBIOS code to find the SMBIOS table for Cloud
Hypervisor if it couldn't be found for Qemu through fw_cfg.

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

OvmfPkg/Include/IndustryStandard/CloudHv.h

@@ -33,4 +33,9 @@
 //
 #define CLOUDHV_MMIO_HOLE_SIZE  0x38000000
 
+//
+// SMBIOS address
+//
+#define CLOUDHV_SMBIOS_ADDRESS  0xf0000
+
 #endif // __CLOUDHV_H__

OvmfPkg/SmbiosPlatformDxe/CloudHv.c

@@ -0,0 +1,33 @@
+/** @file
+  Find Cloud Hypervisor SMBIOS data.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <IndustryStandard/CloudHv.h> // CLOUDHV_SMBIOS_ADDRESS
+#include <IndustryStandard/SmBios.h>  // SMBIOS_TABLE_3_0_ENTRY_POINT
+
+/**
+  Locates and extracts Cloud Hypervisor SMBIOS data
+
+  @return                 Address of extracted Cloud Hypervisor SMBIOS data
+
+**/
+UINT8 *
+GetCloudHvSmbiosTables (
+  VOID
+  )
+{
+  SMBIOS_TABLE_3_0_ENTRY_POINT  *CloudHvTables = (VOID *)CLOUDHV_SMBIOS_ADDRESS;
+
+  if ((CloudHvTables->AnchorString[0] == '_') &&
+      (CloudHvTables->AnchorString[1] == 'S') &&
+      (CloudHvTables->AnchorString[2] == 'M') &&
+      (CloudHvTables->AnchorString[3] == '3') &&
+      (CloudHvTables->AnchorString[4] == '_'))
+  {
+    return (UINT8 *)(UINTN)CloudHvTables->TableAddress;
+  }
+
+  return NULL;
+}

OvmfPkg/SmbiosPlatformDxe/EntryPoint.c

@@ -5,6 +5,7 @@
 **/
 
 #include <Library/MemoryAllocationLib.h> // FreePool()
+#include <OvmfPlatforms.h>               // CLOUDHV_DEVICE_ID
 
 #include "SmbiosPlatformDxe.h"
 
@@ -27,15 +28,24 @@ SmbiosTablePublishEntry (
 {
   EFI_STATUS  Status;
   UINT8       *SmbiosTables;
+  UINT16      HostBridgeDevId;
 
   Status = EFI_NOT_FOUND;
   //
-  // Add QEMU SMBIOS data if found
+  // Add SMBIOS data if found
   //
-  SmbiosTables = GetQemuSmbiosTables ();
-  if (SmbiosTables != NULL) {
-    Status = InstallAllStructures (SmbiosTables);
-    FreePool (SmbiosTables);
+  HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
+  if (HostBridgeDevId == CLOUDHV_DEVICE_ID) {
+    SmbiosTables = GetCloudHvSmbiosTables ();
+    if (SmbiosTables != NULL) {
+      Status = InstallAllStructures (SmbiosTables);
+    }
+  } else {
+    SmbiosTables = GetQemuSmbiosTables ();
+    if (SmbiosTables != NULL) {
+      Status = InstallAllStructures (SmbiosTables);
+      FreePool (SmbiosTables);
+    }
   }
 
   return Status;

OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.h

@@ -33,4 +33,15 @@ GetQemuSmbiosTables (
   VOID
   );
 
+/**
+  Locates and extracts Cloud Hypervisor SMBIOS data
+
+  @return                 Address of extracted Cloud Hypervisor SMBIOS data
+
+**/
+UINT8 *
+GetCloudHvSmbiosTables (
+  VOID
+  );
+
 #endif

OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf

@@ -24,6 +24,7 @@
 #
 
 [Sources]
+  CloudHv.c
   EntryPoint.c
   Qemu.c
   SmbiosPlatformDxe.c
@@ -42,6 +43,7 @@
   UefiDriverEntryPoint
 
 [Pcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId
   gUefiOvmfPkgTokenSpaceGuid.PcdQemuSmbiosValidated
 
 [Protocols]