The default behavior for unaccepted memory in SEV-SNP is to accept all
memory when ExitBootServices is called. An OS loader can use this
protocol to disable this behavior to assume responsibility for memory
acceptance and to affirm that the OS can handle the unaccepted memory
type.
This is a candidate for standardization.
Cc: Gerd Hoffmann <kra...@redhat.com>
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Ard Biesheuvel <a...@kernel.org>
Cc: "Min M. Xu" <min.m...@intel.com>
Cc: Andrew Fish <af...@apple.com>
Cc: "Michael D. Kinney" <michael.d.kin...@intel.com>
Signed-off-by: Dionna Glaze <dionnagl...@google.com>
---
MdePkg/Include/Protocol/Bz3987SevMemoryAcceptance.h | 44 ++++++++++++++++++++
MdePkg/MdePkg.dec | 3 ++
2 files changed, 47 insertions(+)
diff --git a/MdePkg/Include/Protocol/Bz3987SevMemoryAcceptance.h
b/MdePkg/Include/Protocol/Bz3987SevMemoryAcceptance.h
new file mode 100644
index 0000000000..c3691e1c93
--- /dev/null
+++ b/MdePkg/Include/Protocol/Bz3987SevMemoryAcceptance.h
@@ -0,0 +1,44 @@
+/** @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 kernel support released
+ before kernel 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 BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID \
+ {0xc5a010fe, \
+ 0x38a7, \
+ 0x4531, \
+ {0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49}}
+
+typedef struct _BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL \
+ BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL;
+
+/**
+ @param This A pointer to a BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL.
+**/
+typedef
+ EFI_STATUS
+(EFIAPI *BZ3987_SEV_ALLOW_UNACCEPTED_MEMORY)(
+ IN BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL *This
+ );
+
+///
+/// The BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL allows the OS loader to
+/// indicate to EDK2 that ExitBootServices should not accept all memory.
+///
+struct _BZ3987_SEV_MEMORY_ACCEPTANCE_PROTOCOL {
+ BZ3987_SEV_ALLOW_UNACCEPTED_MEMORY AllowUnacceptedMemory;
+};
+
+extern EFI_GUID gBz3987SevMemoryAcceptanceProtocolGuid;
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 3d08f20d15..b82d6e46a4 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -1031,6 +1031,9 @@
gEfiPeiDelayedDispatchPpiGuid = { 0x869c711d, 0x649c, 0x44fe, { 0x8b, 0x9e,
0x2c, 0xbb, 0x29, 0x11, 0xc3, 0xe6 }}
[Protocols]
+ ## Include/Protocol/Bz3987SevMemoryAcceptance.h
+ gBz3987SevMemoryAcceptanceProtocolGuid = { 0xc5a010fe, 0x38a7, 0x4531,
{0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49 }}
+
## Include/Protocol/MemoryAccept.h
gEdkiiMemoryAcceptProtocolGuid = { 0x38c74800, 0x5590, 0x4db4, { 0xa0, 0xf3,
0x67, 0x5d, 0x9b, 0x8e, 0x80, 0x26 }}
--
2.39.1.456.gfc5497dd1b-goog
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#99051): https://edk2.groups.io/g/devel/message/99051
Mute This Topic: https://groups.io/mt/96534753/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-
