[PATCH v2 14/31] OvmfPkg/AcpiPlatformDxe: Use PVH RSDP if exist

["Anthony PERARD" <anthony.perard@citrix.com>]

If the firmware have been started via the PVH entry point, a RSDP
pointer would have been provided. Use it.

Also, use XenDetect() from the new XenPlatformLib.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 OvmfPkg/OvmfPkgIa32.dsc                     |  1 +
 OvmfPkg/OvmfPkgIa32X64.dsc                  |  1 +
 OvmfPkg/OvmfPkgX64.dsc                      |  1 +
 OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf |  2 +-
 OvmfPkg/AcpiPlatformDxe/AcpiPlatform.h      |  6 +--
 OvmfPkg/AcpiPlatformDxe/Xen.c               | 41 ++++++++------------
 6 files changed, 22 insertions(+), 30 deletions(-)

diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index f55ab5a3d2..cab9764cab 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -205,6 +205,7 @@ [LibraryClasses]
   SmbusLib|MdePkg/Library/BaseSmbusLibNull/BaseSmbusLibNull.inf
   OrderedCollectionLib|MdePkg/Library/BaseOrderedCollectionRedBlackTreeLib/BaseOrderedCollectionRedBlackTreeLib.inf
   XenHypercallLib|OvmfPkg/Library/XenHypercallLib/XenHypercallLib.inf
+  XenPlatformLib|OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf
 
 !if $(TPM2_ENABLE) == TRUE
   Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index 5c9bdf034e..a156358690 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -210,6 +210,7 @@ [LibraryClasses]
   SmbusLib|MdePkg/Library/BaseSmbusLibNull/BaseSmbusLibNull.inf
   OrderedCollectionLib|MdePkg/Library/BaseOrderedCollectionRedBlackTreeLib/BaseOrderedCollectionRedBlackTreeLib.inf
   XenHypercallLib|OvmfPkg/Library/XenHypercallLib/XenHypercallLib.inf
+  XenPlatformLib|OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf
 
 !if $(TPM2_ENABLE) == TRUE
   Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 2943e9e8af..9d8dc442b4 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -210,6 +210,7 @@ [LibraryClasses]
   SmbusLib|MdePkg/Library/BaseSmbusLibNull/BaseSmbusLibNull.inf
   OrderedCollectionLib|MdePkg/Library/BaseOrderedCollectionRedBlackTreeLib/BaseOrderedCollectionRedBlackTreeLib.inf
   XenHypercallLib|OvmfPkg/Library/XenHypercallLib/XenHypercallLib.inf
+  XenPlatformLib|OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf
 
 !if $(TPM2_ENABLE) == TRUE
   Tpm2CommandLib|SecurityPkg/Library/Tpm2CommandLib/Tpm2CommandLib.inf
diff --git a/OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf b/OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf
index 8440e7b343..ca54a3bd9e 100644
--- a/OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf
+++ b/OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf
@@ -51,13 +51,13 @@ [LibraryClasses]
   DebugLib
   UefiBootServicesTableLib
   UefiDriverEntryPoint
-  HobLib
   QemuFwCfgLib
   QemuFwCfgS3Lib
   MemoryAllocationLib
   BaseLib
   DxeServicesTableLib
   OrderedCollectionLib
+  XenPlatformLib
 
 [Protocols]
   gEfiAcpiTableProtocolGuid                     # PROTOCOL ALWAYS_CONSUMED
diff --git a/OvmfPkg/AcpiPlatformDxe/AcpiPlatform.h b/OvmfPkg/AcpiPlatformDxe/AcpiPlatform.h
index 83b981ee00..85f37128dd 100644
--- a/OvmfPkg/AcpiPlatformDxe/AcpiPlatform.h
+++ b/OvmfPkg/AcpiPlatformDxe/AcpiPlatform.h
@@ -25,6 +25,7 @@
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/DebugLib.h>
 #include <Library/PcdLib.h>
+#include <Library/XenPlatformLib.h>
 
 #include <IndustryStandard/Acpi.h>
 
@@ -58,11 +59,6 @@ QemuInstallAcpiTable (
   OUT  UINTN                         *TableKey
   );
 
-BOOLEAN
-XenDetected (
-  VOID
-  );
-
 EFI_STATUS
 EFIAPI
 InstallXenTables (
diff --git a/OvmfPkg/AcpiPlatformDxe/Xen.c b/OvmfPkg/AcpiPlatformDxe/Xen.c
index 618ac58b42..7e9a7797d7 100644
--- a/OvmfPkg/AcpiPlatformDxe/Xen.c
+++ b/OvmfPkg/AcpiPlatformDxe/Xen.c
@@ -15,8 +15,6 @@
 **/ 
 
 #include "AcpiPlatform.h"
-#include <Library/HobLib.h>
-#include <Guid/XenInfo.h>
 #include <Library/BaseLib.h>
 
 #define XEN_ACPI_PHYSICAL_ADDRESS         0x000EA020
@@ -24,28 +22,6 @@
 
 EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER  *XenAcpiRsdpStructurePtr = NULL;
 
-/**
-  This function detects if OVMF is running on Xen.
-
-**/
-BOOLEAN
-XenDetected (
-  VOID
-  )
-{
-  EFI_HOB_GUID_TYPE         *GuidHob;
-
-  //
-  // See if a XenInfo HOB is available
-  //
-  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
-  if (GuidHob == NULL) {
-    return FALSE;
-  }
-
-  return TRUE;
-}
-
 /**
   Get the address of Xen ACPI Root System Description Pointer (RSDP)
   structure.
@@ -66,10 +42,27 @@ GetXenAcpiRsdp (
   EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER   *RsdpStructurePtr;
   UINT8                                          *XenAcpiPtr;
   UINT8                                          Sum;
+  EFI_XEN_INFO                                   *XenInfo;
 
   //
   // Detect the RSDP structure
   //
+
+  //
+  // First look for PVH one
+  //
+  XenInfo = XenGetInfoHOB ();
+  ASSERT (XenInfo != NULL);
+  if (XenInfo->RsdpPvh != NULL) {
+    DEBUG ((DEBUG_INFO, "AcpiPlatformDxe: Use ACPI RSDP table at 0x%08x\n",
+            XenInfo->RsdpPvh));
+    *RsdpPtr = XenInfo->RsdpPvh;
+    return EFI_SUCCESS;
+  }
+
+  //
+  // Otherwise, look for the HVM one
+  //
   for (XenAcpiPtr = (UINT8*)(UINTN) XEN_ACPI_PHYSICAL_ADDRESS;
        XenAcpiPtr < (UINT8*)(UINTN) XEN_BIOS_PHYSICAL_END;
        XenAcpiPtr += 0x10) {
-- 
Anthony PERARD