BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275
When AMD SEV is enabled in the guest VM, a hypervisor need to insert a
secrets page.
When SEV-SNP is enabled, the secrets page contains the VM platform
communication keys. The guest BIOS and OS can use this key to communicate
with the SEV firmware to get attesation report. See the SEV-SNP firmware
spec for more details for the content of the secrets page.
When SEV and SEV-ES is enabled, the secrets page contains the information
provided by the guest owner after the attestation. See the SEV
LAUNCH_SECRET command for more details.
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Min Xu <min.m...@intel.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Erdem Aktas <erdemak...@google.com>
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
---
OvmfPkg/AmdSev/SecretPei/SecretPei.c | 16 +++++++++++++++-
OvmfPkg/AmdSev/SecretPei/SecretPei.inf | 1 +
OvmfPkg/OvmfPkgX64.dsc | 2 ++
OvmfPkg/OvmfPkgX64.fdf | 5 +++++
4 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/OvmfPkg/AmdSev/SecretPei/SecretPei.c
b/OvmfPkg/AmdSev/SecretPei/SecretPei.c
index ad491515dd..92836c562c 100644
--- a/OvmfPkg/AmdSev/SecretPei/SecretPei.c
+++ b/OvmfPkg/AmdSev/SecretPei/SecretPei.c
@@ -7,6 +7,7 @@
#include <PiPei.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
+#include <Library/MemEncryptSevLib.h>
EFI_STATUS
EFIAPI
@@ -15,10 +16,23 @@ InitializeSecretPei (
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
+ UINTN Type;
+
+ //
+ // The secret page should be mapped encrypted by the guest OS and must not
+ // be treated as a system RAM. Mark it as ACPI NVS so that guest OS maps it
+ // encrypted.
+ //
+ if (MemEncryptSevSnpIsEnabled ()) {
+ Type = EfiACPIMemoryNVS;
+ } else {
+ Type = EfiBootServicesData;
+ }
+
BuildMemoryAllocationHob (
PcdGet32 (PcdSevLaunchSecretBase),
PcdGet32 (PcdSevLaunchSecretSize),
- EfiBootServicesData
+ Type
);
return EFI_SUCCESS;
diff --git a/OvmfPkg/AmdSev/SecretPei/SecretPei.inf
b/OvmfPkg/AmdSev/SecretPei/SecretPei.inf
index 08be156c4b..9265f8adee 100644
--- a/OvmfPkg/AmdSev/SecretPei/SecretPei.inf
+++ b/OvmfPkg/AmdSev/SecretPei/SecretPei.inf
@@ -26,6 +26,7 @@
HobLib
PeimEntryPoint
PcdLib
+ MemEncryptSevLib
[FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index a7d747f6b4..593c0e69f6 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -716,6 +716,7 @@
OvmfPkg/SmmAccess/SmmAccessPei.inf
!endif
UefiCpuPkg/CpuMpPei/CpuMpPei.inf
+ OvmfPkg/AmdSev/SecretPei/SecretPei.inf
!if $(TPM_ENABLE) == TRUE
OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPei.inf
@@ -965,6 +966,7 @@
OvmfPkg/PlatformDxe/Platform.inf
OvmfPkg/AmdSevDxe/AmdSevDxe.inf
OvmfPkg/IoMmuDxe/IoMmuDxe.inf
+ OvmfPkg/AmdSev/SecretDxe/SecretDxe.inf
!if $(SMM_REQUIRE) == TRUE
OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
diff --git a/OvmfPkg/OvmfPkgX64.fdf b/OvmfPkg/OvmfPkgX64.fdf
index d519f85328..b04175f77c 100644
--- a/OvmfPkg/OvmfPkgX64.fdf
+++ b/OvmfPkg/OvmfPkgX64.fdf
@@ -88,6 +88,9 @@
gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase|gUefiCpuPkgTokenSpaceGuid.PcdSevE
0x00C000|0x001000
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupSize
+0x00D000|0x001000
+gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase|gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize
+
0x010000|0x010000
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize
@@ -178,6 +181,7 @@ INF OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPei.inf
INF SecurityPkg/Tcg/TcgPei/TcgPei.inf
INF SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf
!endif
+INF OvmfPkg/AmdSev/SecretPei/SecretPei.inf
################################################################################
@@ -313,6 +317,7 @@ INF
OvmfPkg/LinuxInitrdDynamicShellCommand/LinuxInitrdDynamicShellCommand.inf
INF ShellPkg/Application/Shell/Shell.inf
INF MdeModulePkg/Logo/LogoDxe.inf
+INF OvmfPkg/AmdSev/SecretDxe/SecretDxe.inf
#
# Network modules
--
2.17.1
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