1 files changed, 115 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.c b/roms/edk2/OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.c
new file mode 100644
index 000000000..c88a95c6d
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.c
@@ -0,0 +1,115 @@
+/** @file
+SMM CPU Platform Hook library instance for QEMU.
+
+Copyright (c) 2020, Red Hat, Inc.
+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <Library/BaseLib.h>                 // AsmReadMsr64()
+#include <PiSmm.h>
+#include <Register/Intel/ArchitecturalMsr.h> // MSR_IA32_APIC_BASE_REGISTER
+
+#include <Library/SmmCpuPlatformHookLib.h>
+
+/**
+  Checks if platform produces a valid SMI.
+
+  This function checks if platform produces a valid SMI. This function is
+  called at SMM entry to detect if this is a spurious SMI. This function
+  must be implemented in an MP safe way because it is called by multiple CPU
+  threads.
+
+  @retval TRUE              There is a valid SMI
+  @retval FALSE             There is no valid SMI
+
+**/
+BOOLEAN
+EFIAPI
+PlatformValidSmi (
+  VOID
+  )
+{
+  return TRUE;
+}
+
+/**
+  Clears platform top level SMI status bit.
+
+  This function clears platform top level SMI status bit.
+
+  @retval TRUE              The platform top level SMI status is cleared.
+  @retval FALSE             The platform top level SMI status cannot be
+                            cleared.
+
+**/
+BOOLEAN
+EFIAPI
+ClearTopLevelSmiStatus (
+  VOID
+  )
+{
+  return TRUE;
+}
+
+/**
+  Performs platform specific way of SMM BSP election.
+
+  This function performs platform specific way of SMM BSP election.
+
+  @param  IsBsp             Output parameter. TRUE: the CPU this function
+                            executes on is elected to be the SMM BSP. FALSE:
+                            the CPU this function executes on is to be SMM AP.
+
+  @retval EFI_SUCCESS       The function executes successfully.
+  @retval EFI_NOT_READY     The function does not determine whether this CPU
+                            should be BSP or AP. This may occur if hardware
+                            init sequence to enable the determination is yet to
+                            be done, or the function chooses not to do BSP
+                            election and will let SMM CPU driver to use its
+                            default BSP election process.
+  @retval EFI_DEVICE_ERROR  The function cannot determine whether this CPU
+                            should be BSP or AP due to hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+PlatformSmmBspElection (
+  OUT BOOLEAN     *IsBsp
+  )
+{
+  MSR_IA32_APIC_BASE_REGISTER ApicBaseMsr;
+
+  ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE);
+  *IsBsp = (BOOLEAN)(ApicBaseMsr.Bits.BSP == 1);
+  return EFI_SUCCESS;
+}
+
+/**
+  Get platform page table attribute.
+
+  This function gets page table attribute of platform.
+
+  @param  Address        Input parameter. Obtain the page table entries
+                         attribute on this address.
+  @param  PageSize       Output parameter. The size of the page.
+  @param  NumOfPages     Output parameter. Number of page.
+  @param  PageAttribute  Output parameter. Paging Attributes (WB, UC, etc).
+
+  @retval EFI_SUCCESS      The platform page table attribute from the address
+                           is determined.
+  @retval EFI_UNSUPPORTED  The platform does not support getting page table
+                           attribute for the address.
+
+**/
+EFI_STATUS
+EFIAPI
+GetPlatformPageTableAttribute (
+  IN  UINT64                Address,
+  IN OUT SMM_PAGE_SIZE_TYPE *PageSize,
+  IN OUT UINTN              *NumOfPages,
+  IN OUT UINTN              *PageAttribute
+  )
+{
+  return EFI_UNSUPPORTED;
+}