diff --git a/OvmfPkg/Include/IndustryStandard/Xen/arch-arm/xen.h b/OvmfPkg/Include/IndustryStandard/Xen/arch-arm/xen.h
index 625a0fc99416..a394f8d85a5d 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/arch-arm/xen.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/arch-arm/xen.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * arch-arm.h
  *
  * Guest OS interface to ARM Xen.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright 2011 (C) Citrix Systems
  */
 
 #ifndef __XEN_PUBLIC_ARCH_ARM_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_32.h b/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_32.h
index 82f9e49f3341..86378fba9b34 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_32.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_32.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * xen-x86_32.h
  * 
  * Guest OS interface to x86 32-bit Xen.
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2004-2007, K A Fraser
  */
 
 #ifndef __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_64.h b/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_64.h
index ad2b6b0a4c62..9dc92d02ce6c 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_64.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen-x86_64.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * xen-x86_64.h
  * 
  * Guest OS interface to x86 64-bit Xen.
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2004-2006, K A Fraser
  */
 
 #ifndef __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen.h b/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen.h
index 684ca688c09a..ed69f9241485 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/arch-x86/xen.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * arch-x86/xen.h
  * 
  * Guest OS interface to x86 Xen.
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2004-2006, K A Fraser
  */
 
 #include "../xen.h"
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/event_channel.h b/OvmfPkg/Include/IndustryStandard/Xen/event_channel.h
index 6377ce7b1afb..4fff5654af66 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/event_channel.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/event_channel.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * event_channel.h
  *
  * Event channels between domains.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2003-2004, K A Fraser.
  */
 
 #ifndef __XEN_PUBLIC_EVENT_CHANNEL_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/grant_table.h b/OvmfPkg/Include/IndustryStandard/Xen/grant_table.h
index 029d049382e1..da8d6c2705f0 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/grant_table.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/grant_table.h
@@ -2,27 +2,11 @@
  * grant_table.h
  *
  * Interface for granting foreign access to page frames, and receiving
  * page-ownership transfers.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2004, K A Fraser
  */
 
 #ifndef __XEN_PUBLIC_GRANT_TABLE_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/hvm/hvm_op.h b/OvmfPkg/Include/IndustryStandard/Xen/hvm/hvm_op.h
index bd8d445c081d..5eca23c2055a 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/hvm/hvm_op.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/hvm/hvm_op.h
@@ -1,23 +1,7 @@
 /*
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  */
 
 #ifndef __XEN_PUBLIC_HVM_HVM_OP_H__
 #define __XEN_PUBLIC_HVM_HVM_OP_H__
 
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/hvm/params.h b/OvmfPkg/Include/IndustryStandard/Xen/hvm/params.h
index cac33359ceb0..3b94435c9f8d 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/hvm/params.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/hvm/params.h
@@ -1,23 +1,7 @@
 /*
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  */
 
 #ifndef __XEN_PUBLIC_HVM_PARAMS_H__
 #define __XEN_PUBLIC_HVM_PARAMS_H__
 
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/io/blkif.h b/OvmfPkg/Include/IndustryStandard/Xen/io/blkif.h
index 27774d6285ef..ff8e77589f92 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/io/blkif.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/io/blkif.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * blkif.h
  *
  * Unified block-device I/O interface for Xen guest OSes.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2003-2004, Keir Fraser
  * Copyright (c) 2012, Spectra Logic Corporation
  */
 
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/io/console.h b/OvmfPkg/Include/IndustryStandard/Xen/io/console.h
index f1caa9765bcf..c38d88b07aa3 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/io/console.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/io/console.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * console.h
  *
  * Console I/O interface for Xen guest OSes.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2005, Keir Fraser
  */
 
 #ifndef __XEN_PUBLIC_IO_CONSOLE_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/io/protocols.h b/OvmfPkg/Include/IndustryStandard/Xen/io/protocols.h
index e2cbd871aa7c..0c48e7693787 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/io/protocols.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/io/protocols.h
@@ -1,25 +1,9 @@
 /******************************************************************************
  * protocols.h
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  */
 
 #ifndef __XEN_PROTOCOLS_H__
 #define __XEN_PROTOCOLS_H__
 
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/io/ring.h b/OvmfPkg/Include/IndustryStandard/Xen/io/ring.h
index 16313773cb9e..c770ade40785 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/io/ring.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/io/ring.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * ring.h
  * 
  * Shared producer-consumer ring macros.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Tim Deegan and Andrew Warfield November 2004.
  */
 
 #ifndef __XEN_PUBLIC_IO_RING_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/io/xenbus.h b/OvmfPkg/Include/IndustryStandard/Xen/io/xenbus.h
index 4c76b5ba0f68..80db1909e9a4 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/io/xenbus.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/io/xenbus.h
@@ -1,27 +1,11 @@
 /*****************************************************************************
  * xenbus.h
  *
  * Xenbus protocol details.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (C) 2005 XenSource Ltd.
  */
 
 #ifndef _XEN_PUBLIC_IO_XENBUS_H
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/io/xs_wire.h b/OvmfPkg/Include/IndustryStandard/Xen/io/xs_wire.h
index 6f302d1447fa..fb4e48d59182 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/io/xs_wire.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/io/xs_wire.h
@@ -1,26 +1,10 @@
 /*
  * Details of the "wire" protocol between Xen Store Daemon and client
  * library or guest kernel.
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (C) 2005 Rusty Russell IBM Corporation
  */
 
 #ifndef _XS_WIRE_H
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/memory.h b/OvmfPkg/Include/IndustryStandard/Xen/memory.h
index 020155962c3b..81e981331a80 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/memory.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/memory.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * memory.h
  * 
  * Memory reservation and information.
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
  */
 
 #ifndef __XEN_PUBLIC_MEMORY_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/xen-compat.h b/OvmfPkg/Include/IndustryStandard/Xen/xen-compat.h
index 53b7a3c7f6f2..99d5a5dc0419 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/xen-compat.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/xen-compat.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * xen-compat.h
  * 
  * Guest OS interface to Xen.  Compatibility layer.
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2006, Christian Limpach
  */
 
 #ifndef __XEN_PUBLIC_XEN_COMPAT_H__
diff --git a/OvmfPkg/Include/IndustryStandard/Xen/xen.h b/OvmfPkg/Include/IndustryStandard/Xen/xen.h
index 8596ca1bd26f..eccc1ad6251a 100644
--- a/OvmfPkg/Include/IndustryStandard/Xen/xen.h
+++ b/OvmfPkg/Include/IndustryStandard/Xen/xen.h
@@ -1,27 +1,11 @@
 /******************************************************************************
  * xen.h
  * 
  * Guest OS interface to Xen.
  * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  *
  * Copyright (c) 2004, K A Fraser
  */
 
 #ifndef __XEN_PUBLIC_XEN_H__
