OvmfPkg/PlatformPei: Detect S3 support for QEMU / KVM

QEMU indicates whether S3 is supported or not in the
fw-cfg interface.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15293 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/PlatformPei/Platform.c

@@ -30,6 +30,7 @@
 #include <Library/PciLib.h>
 #include <Library/PeimEntryPoint.h>
 #include <Library/PeiServicesLib.h>
+#include <Library/QemuFwCfgLib.h>
 #include <Library/ResourcePublicationLib.h>
 #include <Guid/MemoryTypeInformation.h>
 #include <Ppi/MasterBootMode.h>
@@ -61,6 +62,8 @@ EFI_PEI_PPI_DESCRIPTOR   mPpiBootMode[] = {
 
 EFI_BOOT_MODE mBootMode = BOOT_WITH_FULL_CONFIGURATION;
 
+BOOLEAN mS3Supported = FALSE;
+
 
 VOID
 AddIoMemoryBaseSizeHob (
@@ -356,6 +359,11 @@ InitializePlatform (
 
   XenDetect ();
 
+  if (QemuFwCfgS3Enabled ()) {
+    DEBUG ((EFI_D_INFO, "S3 support was detected on QEMU\n"));
+    mS3Supported = TRUE;
+  }
+
   BootModeInitialization ();
 
   PublishPeiMemory ();

OvmfPkg/PlatformPei/Platform.h

@@ -98,4 +98,6 @@ XenPublishRamRegions (
 
 extern EFI_BOOT_MODE mBootMode;
 
+extern BOOLEAN mS3Supported;
+
 #endif // _PLATFORM_PEI_H_INCLUDED_

OvmfPkg/PlatformPei/PlatformPei.inf

@@ -54,6 +54,7 @@
   PeiServicesLib
   PeiServicesTablePointerLib
   PeimEntryPoint
+  QemuFwCfgLib
   MtrrLib
   PcdLib