diff --git a/OvmfPkg/EnrollDefaultKeys/AuthData.c b/OvmfPkg/EnrollDefaultKeys/AuthData.c
index e0a543785f..9a96dcc440 100644
--- a/OvmfPkg/EnrollDefaultKeys/AuthData.c
+++ b/OvmfPkg/EnrollDefaultKeys/AuthData.c
@@ -523,31 +523,3 @@ CONST UINT8 mSha256OfDevNull[] = {
 };
 
 CONST UINTN mSizeOfSha256OfDevNull = sizeof mSha256OfDevNull;
-
-
-//
-// The following test cases of the Secure Boot Logo Test in the Microsoft
-// Hardware Certification Kit:
-//
-// - Microsoft.UefiSecureBootLogo.Tests.OutOfBoxVerifyMicrosoftKEKpresent
-// - Microsoft.UefiSecureBootLogo.Tests.OutOfBoxConfirmMicrosoftSignatureInDB
-//
-// expect the EFI_SIGNATURE_DATA.SignatureOwner GUID to be
-// 77FA9ABD-0359-4D32-BD60-28F4E78F784B, when the
-// EFI_SIGNATURE_DATA.SignatureData field carries any of the following X509
-// certificates:
-//
-// - "Microsoft Corporation KEK CA 2011" (in KEK)
-// - "Microsoft Windows Production PCA 2011" (in db)
-// - "Microsoft Corporation UEFI CA 2011" (in db)
-//
-// This is despite the fact that the UEFI specification requires
-// EFI_SIGNATURE_DATA.SignatureOwner to reflect the agent (i.e., OS,
-// application or driver) that enrolled and therefore owns
-// EFI_SIGNATURE_DATA.SignatureData, and not the organization that issued
-// EFI_SIGNATURE_DATA.SignatureData.
-//
-CONST EFI_GUID mMicrosoftOwnerGuid = {
-  0x77fa9abd, 0x0359, 0x4d32,
-  { 0xbd, 0x60, 0x28, 0xf4, 0xe7, 0x8f, 0x78, 0x4b },
-};
diff --git a/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.c b/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.c
index 528718b15a..e4f6a50e00 100644
--- a/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.c
+++ b/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.c
@@ -8,6 +8,7 @@
 #include <Guid/AuthenticatedVariableFormat.h>    // gEfiCustomModeEnableGuid
 #include <Guid/GlobalVariable.h>                 // EFI_SETUP_MODE_NAME
 #include <Guid/ImageAuthentication.h>            // EFI_IMAGE_SECURITY_DATABASE
+#include <Guid/MicrosoftVendor.h>                // gMicrosoftVendorGuid
 #include <Library/BaseMemoryLib.h>               // CopyGuid()
 #include <Library/DebugLib.h>                    // ASSERT()
 #include <Library/MemoryAllocationLib.h>         // FreePool()
@@ -315,8 +316,8 @@ ShellAppMain (
              EFI_IMAGE_SECURITY_DATABASE,
              &gEfiImageSecurityDatabaseGuid,
              &gEfiCertX509Guid,
-             mMicrosoftPca,    mSizeOfMicrosoftPca,    &mMicrosoftOwnerGuid,
-             mMicrosoftUefiCa, mSizeOfMicrosoftUefiCa, &mMicrosoftOwnerGuid,
+             mMicrosoftPca,    mSizeOfMicrosoftPca,    &gMicrosoftVendorGuid,
+             mMicrosoftUefiCa, mSizeOfMicrosoftUefiCa, &gMicrosoftVendorGuid,
              NULL);
   if (EFI_ERROR (Status)) {
     return 1;
@@ -337,7 +338,7 @@ ShellAppMain (
              &gEfiGlobalVariableGuid,
              &gEfiCertX509Guid,
              mRedHatPkKek1, mSizeOfRedHatPkKek1, &gEfiCallerIdGuid,
-             mMicrosoftKek, mSizeOfMicrosoftKek, &mMicrosoftOwnerGuid,
+             mMicrosoftKek, mSizeOfMicrosoftKek, &gMicrosoftVendorGuid,
              NULL);
   if (EFI_ERROR (Status)) {
     return 1;
diff --git a/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.h b/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.h
index 07f4aa04e4..e3a7e43da4 100644
--- a/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.h
+++ b/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.h
@@ -138,6 +138,4 @@ extern CONST UINTN mSizeOfMicrosoftUefiCa;
 extern CONST UINT8 mSha256OfDevNull[];
 extern CONST UINTN mSizeOfSha256OfDevNull;
 
-extern CONST EFI_GUID mMicrosoftOwnerGuid;
-
 #endif /* ENROLL_DEFAULT_KEYS_H_ */
diff --git a/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.inf b/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.inf
index 3f093c7685..28db52586a 100644
--- a/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.inf
+++ b/OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.inf
@@ -22,6 +22,7 @@
 [Packages]
   MdeModulePkg/MdeModulePkg.dec
   MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
   SecurityPkg/SecurityPkg.dec
   ShellPkg/ShellPkg.dec
 
@@ -33,6 +34,7 @@
   gEfiGlobalVariableGuid
   gEfiImageSecurityDatabaseGuid
   gEfiSecureBootEnableDisableGuid
+  gMicrosoftVendorGuid
 
 [LibraryClasses]
   BaseMemoryLib
diff --git a/OvmfPkg/Include/Guid/MicrosoftVendor.h b/OvmfPkg/Include/Guid/MicrosoftVendor.h
new file mode 100644
index 0000000000..db7a326c31
--- /dev/null
+++ b/OvmfPkg/Include/Guid/MicrosoftVendor.h
@@ -0,0 +1,55 @@
+/** @file
+  Declare the GUID that is expected:
+
+  - as EFI_SIGNATURE_DATA.SignatureOwner GUID in association with X509 and
+    RSA2048 Secure Boot certificates issued by/for Microsoft,
+
+  - as UEFI variable vendor GUID in association with (unspecified)
+    Microsoft-owned variables.
+
+  Copyright (C) 2014-2019, Red Hat, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Specification Reference:
+  - MSDN: System.Fundamentals.Firmware at
+    <https://msdn.microsoft.com/en-us/ie/dn932805(v=vs.94)>.
+**/
+
+#ifndef MICROSOFT_VENDOR_H_
+#define MICROSOFT_VENDOR_H_
+
+#include <Uefi/UefiBaseType.h>
+
+//
+// The following test cases of the Secure Boot Logo Test in the Microsoft
+// Hardware Certification Kit:
+//
+// - Microsoft.UefiSecureBootLogo.Tests.OutOfBoxVerifyMicrosoftKEKpresent
+// - Microsoft.UefiSecureBootLogo.Tests.OutOfBoxConfirmMicrosoftSignatureInDB
+//
+// expect the EFI_SIGNATURE_DATA.SignatureOwner GUID to be
+// 77FA9ABD-0359-4D32-BD60-28F4E78F784B, when the
+// EFI_SIGNATURE_DATA.SignatureData field carries any of the following X509
+// certificates:
+//
+// - "Microsoft Corporation KEK CA 2011" (in KEK)
+// - "Microsoft Windows Production PCA 2011" (in db)
+// - "Microsoft Corporation UEFI CA 2011" (in db)
+//
+// This is despite the fact that the UEFI specification requires
+// EFI_SIGNATURE_DATA.SignatureOwner to reflect the agent (i.e., OS,
+// application or driver) that enrolled and therefore owns
+// EFI_SIGNATURE_DATA.SignatureData, and not the organization that issued
+// EFI_SIGNATURE_DATA.SignatureData.
+//
+#define MICROSOFT_VENDOR_GUID                           \
+  { 0x77fa9abd,                                         \
+    0x0359,                                             \
+    0x4d32,                                             \
+    { 0xbd, 0x60, 0x28, 0xf4, 0xe7, 0x8f, 0x78, 0x4b }, \
+  }
+
+extern EFI_GUID gMicrosoftVendorGuid;
+
+#endif /* MICROSOFT_VENDOR_H_ */
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index cc2a4909af..922e061cc8 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -77,6 +77,7 @@
   gQemuRamfbGuid                      = {0x557423a1, 0x63ab, 0x406c, {0xbe, 0x7e, 0x91, 0xcd, 0xbc, 0x08, 0xc4, 0x57}}
   gXenBusRootDeviceGuid               = {0xa732241f, 0x383d, 0x4d9c, {0x8a, 0xe1, 0x8e, 0x09, 0x83, 0x75, 0x89, 0xd7}}
   gRootBridgesConnectedEventGroupGuid = {0x24a2d66f, 0xeedd, 0x4086, {0x90, 0x42, 0xf2, 0x6e, 0x47, 0x97, 0xee, 0x69}}
+  gMicrosoftVendorGuid                = {0x77fa9abd, 0x0359, 0x4d32, {0xbd, 0x60, 0x28, 0xf4, 0xe7, 0x8f, 0x78, 0x4b}}
 
 [Protocols]
   gVirtioDeviceProtocolGuid           = {0xfa920010, 0x6785, 0x4941, {0xb6, 0xec, 0x49, 0x8c, 0x57, 0x9f, 0x16, 0x0a}}