1 files changed, 43 insertions, 0 deletions
diff --git a/OvmfPkg/Include/Protocol/SevMemoryAcceptance.h b/OvmfPkg/Include/Protocol/SevMemoryAcceptance.h
new file mode 100644
index 0000000000..c5ea3f383a
--- /dev/null
+++ b/OvmfPkg/Include/Protocol/SevMemoryAcceptance.h
@@ -0,0 +1,43 @@
+/** @file
+  The file provides the protocol that disables the behavior that all memory
+  gets accepted at ExitBootServices(). This protocol is only meant to be called
+  by the OS loader, and not EDK2 itself. The SEV naming is due to the
+  coincidence that only SEV-SNP needs this protocol, since SEV-SNP Linux
+  support was released before it had support for unaccepted memory. The
+  technology enablement thus does not strictly imply support for the unaccepted
+  memory type.
+
+  Copyright (c) 2023, Google LLC. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef SEV_MEMORY_ACCEPTANCE_H_
+#define SEV_MEMORY_ACCEPTANCE_H_
+
+#define OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID \
+  {0xc5a010fe, \
+   0x38a7, \
+   0x4531, \
+   {0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49}}
+
+typedef struct _OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL
+    OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL;
+
+/**
+  @param This A pointer to a OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL.
+**/
+typedef
+  EFI_STATUS
+(EFIAPI *OVMF_SEV_ALLOW_UNACCEPTED_MEMORY)(
+  IN  OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL  *This
+  );
+
+///
+/// The OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL allows the OS loader to
+/// indicate to EDK2 that ExitBootServices should not accept all memory.
+///
+struct _OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL {
+  OVMF_SEV_ALLOW_UNACCEPTED_MEMORY    AllowUnacceptedMemory;
+};
+
+#endif