OvmfPkg: Introduce XenPlatformPei

Introduce XenPlatformPei, a copy of OvmfPkg/PlatformPei without some
of QEMU specific initialization, Xen does not support QemuFwCfg.

This new module will be adjusted to accommodate Xen PVH.

fw_cfg dependents that have been removed, which are dynamically skipped
when running PlatformPei on Xen:
- GetFirstNonAddress(): controlling the 64-bit PCI MMIO aperture via the
(experimental) "opt/ovmf/X-PciMmio64Mb" file
- GetFirstNonAddress(): honoring the hotplug DIMM area
("etc/reserved-memory-end") in the placement of the 64-bit PCI MMIO
aperture
- NoexecDxeInitialization() is removed, so PcdPropertiesTableEnable and
PcdSetNxForStack are left constant FALSE (not set dynamically from
fw_cfg "opt/ovmf/PcdXxxx")
- MaxCpuCountInitialization(), PublishPeiMemory(): the max CPU count is
not taken from the QemuFwCfgItemSmpCpuCount fw_cfg key;
PcdCpuMaxLogicalProcessorNumber is used intact and
PcdCpuApInitTimeOutInMicroSeconds is never changed or used.
- InitializeXenPlatform(), S3Verification(): S3 is assumed disabled (not
consulting "etc/system-states" via QemuFwCfgS3Enabled()).
- InstallFeatureControlCallback(): the feature control MSR is not set
from "etc/msr_feature_control"
(also removed FeatureControl.c as there is nothing been executed)

Also removed:
- SMRAM/TSEG-related low mem size adjusting (PcdSmmSmramRequire is
assumed FALSE) in PublishPeiMemory(),
- QemuInitializeRam() entirely,

Xen related changes:
- Have removed the module variable mXen, as it should be always true.
- Have the platform PEI initialization fails if Xen has not been
  detected.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-5-anthony.perard@citrix.com>

OvmfPkg/XenPlatformPei/XenPlatformPei.inf

@@ -0,0 +1,96 @@
+## @file
+#  Platform PEI driver
+#
+#  This module provides platform specific function to detect boot mode.
+#  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2019, Citrix Systems, Inc.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = XenPlatformPei
+  FILE_GUID                      = f112a6ee-993a-4f0b-8295-e52029d9b4ba
+  MODULE_TYPE                    = PEIM
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = InitializeXenPlatform
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 EBC
+#
+
+[Sources]
+  AmdSev.c
+  ClearCache.c
+  Cmos.c
+  Cmos.h
+  Fv.c
+  MemDetect.c
+  Platform.c
+  Platform.h
+  Xen.c
+  Xen.h
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  SecurityPkg/SecurityPkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[Guids]
+  gEfiMemoryTypeInformationGuid
+  gEfiXenInfoGuid
+
+[LibraryClasses]
+  BaseLib
+  CacheMaintenanceLib
+  DebugLib
+  HobLib
+  IoLib
+  PciLib
+  ResourcePublicationLib
+  PeiServicesLib
+  PeimEntryPoint
+  MtrrLib
+  MemEncryptSevLib
+  PcdLib
+
+[Pcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciIoBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciIoSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Base
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size
+  gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize
+  gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvStoreReserved
+  gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
+  gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode
+  gEfiMdeModulePkgTokenSpaceGuid.PcdUse1GPageTable
+  gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask
+  gEfiSecurityPkgTokenSpaceGuid.PcdOptionRomImageVerificationPolicy
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuLocalApicBaseAddress
+
+[FixedPcd]
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
+
+[Ppis]
+  gEfiPeiMasterBootModePpiGuid
+  gEfiPeiMpServicesPpiGuid
+
+[Depex]
+  TRUE
+