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OvmfPkg: Introduce the OvmfSevMemoryAcceptance protocol 

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.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: "Min M. Xu" <min.m.xu@intel.com>
Cc: Andrew Fish <afish@apple.com>
Cc: "Michael D. Kinney" <michael.d.kinney@intel.com>

Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Dionna Glaze 2023-01-26 21:17:38 +00:00 committed by mergify[bot]
parent a00e2e5513
commit 26847fb6be
2 changed files with 44 additions and 0 deletions
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43
OvmfPkg/Include/Protocol/SevMemoryAcceptance.h Normal file
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@ -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

1
OvmfPkg/OvmfPkg.dec
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@ -184,6 +184,7 @@
gEfiLegacyInterruptProtocolGuid = {0x31ce593d, 0x108a, 0x485d, {0xad, 0xb2, 0x78, 0xf2, 0x1f, 0x29, 0x66, 0xbe}}
gEfiVgaMiniPortProtocolGuid = {0xc7735a2f, 0x88f5, 0x4882, {0xae, 0x63, 0xfa, 0xac, 0x8c, 0x8b, 0x86, 0xb3}}
gOvmfLoadedX86LinuxKernelProtocolGuid = {0xa3edc05d, 0xb618, 0x4ff6, {0x95, 0x52, 0x76, 0xd7, 0x88, 0x63, 0x43, 0xc8}}
gOvmfSevMemoryAcceptanceProtocolGuid = {0xc5a010fe, 0x38a7, 0x4531, {0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49}}
gQemuAcpiTableNotifyProtocolGuid = {0x928939b2, 0x4235, 0x462f, {0x95, 0x80, 0xf6, 0xa2, 0xb2, 0xc2, 0x1a, 0x4f}}
gEfiMpInitLibMpDepProtocolGuid = {0xbb00a5ca, 0x8ce, 0x462f, {0xa5, 0x37, 0x43, 0xc7, 0x4a, 0x82, 0x5c, 0xa4}}
gEfiMpInitLibUpDepProtocolGuid = {0xa9e7cef1, 0x5682, 0x42cc, {0xb1, 0x23, 0x99, 0x30, 0x97, 0x3f, 0x4a, 0x9f}}