MdePkg/Include/AmdSevSnpSecretsPage.h | 51 +++++++++++++++++++ MdePkg/MdePkg.dec | 4 ++ OvmfPkg/AmdSev/AmdSevX64.dsc | 3 ++ OvmfPkg/CloudHv/CloudHvX64.dsc | 3 ++ OvmfPkg/IntelTdx/IntelTdxX64.dsc | 3 ++ OvmfPkg/Microvm/MicrovmX64.dsc | 3 ++ OvmfPkg/OvmfPkgIa32.dsc | 3 ++ OvmfPkg/OvmfPkgIa32X64.dsc | 3 ++ OvmfPkg/OvmfPkgX64.dsc | 3 ++ OvmfPkg/PlatformPei/AmdSev.c | 5 ++ OvmfPkg/PlatformPei/PlatformPei.inf | 1 + UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 + UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 9 ++++ 13 files changed, 92 insertions(+) create mode 100644 MdePkg/Include/AmdSevSnpSecretsPage.h
A full-featured SEV-SNP guest will not rely on the AP jump table, and
will instead use the AP Creation interface defined by the GHCB. However,
a guest is still allowed to use the AP jump table if desired.
However, unlike with SEV-ES guests, SEV-SNP guests should not
store/retrieve the jump table address via GHCB requests to the
hypervisor, they should instead store/retrieve it via the SEV-SNP
secrets page. Implement the store side of this for OVMF.
Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
MdePkg/Include/AmdSevSnpSecretsPage.h | 51 +++++++++++++++++++
MdePkg/MdePkg.dec | 4 ++
OvmfPkg/AmdSev/AmdSevX64.dsc | 3 ++
OvmfPkg/CloudHv/CloudHvX64.dsc | 3 ++
OvmfPkg/IntelTdx/IntelTdxX64.dsc | 3 ++
OvmfPkg/Microvm/MicrovmX64.dsc | 3 ++
OvmfPkg/OvmfPkgIa32.dsc | 3 ++
OvmfPkg/OvmfPkgIa32X64.dsc | 3 ++
OvmfPkg/OvmfPkgX64.dsc | 3 ++
OvmfPkg/PlatformPei/AmdSev.c | 5 ++
OvmfPkg/PlatformPei/PlatformPei.inf | 1 +
UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 +
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 9 ++++
13 files changed, 92 insertions(+)
create mode 100644 MdePkg/Include/AmdSevSnpSecretsPage.h
diff --git a/MdePkg/Include/AmdSevSnpSecretsPage.h b/MdePkg/Include/AmdSevSnpSecretsPage.h
new file mode 100644
index 0000000000..55c7475ff0
--- /dev/null
+++ b/MdePkg/Include/AmdSevSnpSecretsPage.h
@@ -0,0 +1,51 @@
+/** @file
+Definitions for AMD SEV-SNP Secrets Page
+
+Copyright (c) 2022 AMD Inc. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef AMD_SEV_SNP_SECRETS_PAGE_H_
+#define AMD_SEV_SNP_SECRETS_PAGE_H_
+
+//
+// OS-defined area of secrets page
+//
+// As defined by "SEV-ES Guest-Hypervisor Communication Block Standardization",
+// revision 1.50, section 2.7, "SEV-SNP Secrets Page".
+//
+typedef PACKED struct _SNP_SECRETS_OS_AREA {
+ UINT32 MsgSeqNum0;
+ UINT32 MsgSeqNum1;
+ UINT32 MsgSeqNum2;
+ UINT32 MsgSeqNum3;
+ UINT64 ApJumpTablePa;
+ UINT8 Reserved[40];
+ UINT8 GuestUsage[32];
+} SNP_SECRETS_OS_AREA;
+
+#define VMPCK_KEY_LEN 32
+
+//
+// SEV-SNP Secrets page
+//
+// As defined by "SEV-SNP Firmware ABI", revision 1.51, section 8.17.2.5,
+// "PAGE_TYPE_SECRETS".
+//
+typedef PACKED struct _SNP_SECRETS_PAGE {
+ UINT32 Version;
+ UINT32 ImiEn : 1,
+ Reserved : 31;
+ UINT32 Fms;
+ UINT32 Reserved2;
+ UINT8 Gosvw[16];
+ UINT8 Vmpck0[VMPCK_KEY_LEN];
+ UINT8 Vmpck1[VMPCK_KEY_LEN];
+ UINT8 Vmpck2[VMPCK_KEY_LEN];
+ UINT8 Vmpck3[VMPCK_KEY_LEN];
+ SNP_SECRETS_OS_AREA OsArea;
+ UINT8 Reserved3[3840];
+} SNP_SECRETS_PAGE;
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index f1ebf9e251..a365bfcfe8 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -2417,5 +2417,9 @@
# @Prompt Memory encryption attribute
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0|UINT64|0x0000002e
+ ## This dynamic PCD indicates the location of the SEV-SNP secrets page.
+ # @Prompt SEV-SNP secrets page address
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0|UINT64|0x0000002f
+
[UserExtensions.TianoCore."ExtraFiles"]
MdePkgExtra.uni
diff --git a/OvmfPkg/AmdSev/AmdSevX64.dsc b/OvmfPkg/AmdSev/AmdSevX64.dsc
index f0700035c1..02306945fd 100644
--- a/OvmfPkg/AmdSev/AmdSevX64.dsc
+++ b/OvmfPkg/AmdSev/AmdSevX64.dsc
@@ -575,6 +575,9 @@
# Set ConfidentialComputing defaults
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
!include OvmfPkg/OvmfTpmPcds.dsc.inc
gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
diff --git a/OvmfPkg/CloudHv/CloudHvX64.dsc b/OvmfPkg/CloudHv/CloudHvX64.dsc
index d1c85f60c7..7143698253 100644
--- a/OvmfPkg/CloudHv/CloudHvX64.dsc
+++ b/OvmfPkg/CloudHv/CloudHvX64.dsc
@@ -630,6 +630,9 @@
# Set ConfidentialComputing defaults
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
[PcdsDynamicHii]
!include OvmfPkg/OvmfTpmPcdsHii.dsc.inc
diff --git a/OvmfPkg/IntelTdx/IntelTdxX64.dsc b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
index 80c331ea23..b19718c572 100644
--- a/OvmfPkg/IntelTdx/IntelTdxX64.dsc
+++ b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
@@ -512,6 +512,9 @@
gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
################################################################################
#
# Components Section - list of all EDK II Modules needed by this Platform.
diff --git a/OvmfPkg/Microvm/MicrovmX64.dsc b/OvmfPkg/Microvm/MicrovmX64.dsc
index 20c3c9c4d8..42673c29ee 100644
--- a/OvmfPkg/Microvm/MicrovmX64.dsc
+++ b/OvmfPkg/Microvm/MicrovmX64.dsc
@@ -613,6 +613,9 @@
# Set ConfidentialComputing defaults
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
################################################################################
#
# Components Section - list of all EDK II Modules needed by this Platform.
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 533bbdb435..8ffef069a3 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -649,6 +649,9 @@
# Set ConfidentialComputing defaults
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
!if $(CSM_ENABLE) == FALSE
gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
!endif
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index cb68e612bd..0b4d5001b2 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -657,6 +657,9 @@
# Set ConfidentialComputing defaults
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
!if $(CSM_ENABLE) == FALSE
gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
!endif
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 71526bba31..3a3223be6b 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -680,6 +680,9 @@
# Set ConfidentialComputing defaults
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
+ # Set SEV-SNP Secrets page address default
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
+
!if $(CSM_ENABLE) == FALSE
gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
!endif
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index 385562b44c..70352ca43b 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -408,6 +408,11 @@ AmdSevInitialize (
//
if (MemEncryptSevSnpIsEnabled ()) {
PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevSnp);
+ ASSERT_RETURN_ERROR (PcdStatus);
+ PcdStatus = PcdSet64S (
+ PcdSevSnpSecretsAddress,
+ (UINT64)(UINTN)PcdGet32 (PcdOvmfSnpSecretsBase)
+ );
} else if (MemEncryptSevEsIsEnabled ()) {
PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevEs);
} else {
diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
index 00372fa0eb..c688e4ee24 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -114,6 +114,7 @@
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr
gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures
gEfiMdeModulePkgTokenSpaceGuid.PcdTdxSharedBitMask
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress
[FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
index e1cd0b3500..d8cfddcd82 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
@@ -80,3 +80,4 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard ## CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase ## CONSUMES
gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr ## CONSUMES
+ gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress ## CONSUMES
diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
index 60d14a5a0e..6014dce136 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
@@ -15,6 +15,7 @@
#include <Library/VmgExitLib.h>
#include <Register/Amd/Fam17Msr.h>
#include <Register/Amd/Ghcb.h>
+#include <AmdSevSnpSecretsPage.h>
#include <Protocol/Timer.h>
@@ -216,6 +217,14 @@ GetSevEsAPMemory (
DEBUG ((DEBUG_INFO, "Dxe: SevEsAPMemory = %lx\n", (UINTN)StartAddress));
+ if (ConfidentialComputingGuestHas (CCAttrAmdSevSnp)) {
+ SNP_SECRETS_PAGE *Secrets = (SNP_SECRETS_PAGE *)(INTN)PcdGet64 (PcdSevSnpSecretsAddress);
+
+ Secrets->OsArea.ApJumpTablePa = (UINT64)(UINTN)StartAddress;
+
+ return (UINTN)StartAddress;
+ }
+
//
// Save the SevEsAPMemory as the AP jump table.
//
--
2.25.1
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-=-=-=-=-=-=-=-=-=-=-=-On 5/13/22 08:22, Michael Roth wrote:
> A full-featured SEV-SNP guest will not rely on the AP jump table, and
> will instead use the AP Creation interface defined by the GHCB. However,
> a guest is still allowed to use the AP jump table if desired.
>
> However, unlike with SEV-ES guests, SEV-SNP guests should not
> store/retrieve the jump table address via GHCB requests to the
> hypervisor, they should instead store/retrieve it via the SEV-SNP
> secrets page. Implement the store side of this for OVMF.
>
> Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
> Signed-off-by: Michael Roth <michael.roth@amd.com>
> ---
> MdePkg/Include/AmdSevSnpSecretsPage.h | 51 +++++++++++++++++++
> MdePkg/MdePkg.dec | 4 ++
> OvmfPkg/AmdSev/AmdSevX64.dsc | 3 ++
> OvmfPkg/CloudHv/CloudHvX64.dsc | 3 ++
> OvmfPkg/IntelTdx/IntelTdxX64.dsc | 3 ++
> OvmfPkg/Microvm/MicrovmX64.dsc | 3 ++
> OvmfPkg/OvmfPkgIa32.dsc | 3 ++
> OvmfPkg/OvmfPkgIa32X64.dsc | 3 ++
> OvmfPkg/OvmfPkgX64.dsc | 3 ++
> OvmfPkg/PlatformPei/AmdSev.c | 5 ++
> OvmfPkg/PlatformPei/PlatformPei.inf | 1 +
> UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 +
> UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 9 ++++
> 13 files changed, 92 insertions(+)
> create mode 100644 MdePkg/Include/AmdSevSnpSecretsPage.h
>
> diff --git a/MdePkg/Include/AmdSevSnpSecretsPage.h b/MdePkg/Include/AmdSevSnpSecretsPage.h
> new file mode 100644
> index 0000000000..55c7475ff0
> --- /dev/null
> +++ b/MdePkg/Include/AmdSevSnpSecretsPage.h
Just wondering if this should be in the MdePkg/Include/Register/Amd directory?
> @@ -0,0 +1,51 @@
> +/** @file
> +Definitions for AMD SEV-SNP Secrets Page
> +
> +Copyright (c) 2022 AMD Inc. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef AMD_SEV_SNP_SECRETS_PAGE_H_
> +#define AMD_SEV_SNP_SECRETS_PAGE_H_
> +
> +//
> +// OS-defined area of secrets page
> +//
> +// As defined by "SEV-ES Guest-Hypervisor Communication Block Standardization",
> +// revision 1.50, section 2.7, "SEV-SNP Secrets Page".
This should be using at least revision 2.00 (if not 2.01 which is in the
process of being published). 2.01 uses some of the 40-byte reserved area
to hold the high 32-bits of the message sequence numbers (since the SNP
API changed after the GHCB spec was published to convert the sequence
numbers from 32-bit to 64-bit). The changes are backwards compatible, so
not a big deal as to whether to implement since OVMF doesn't make any
guest request API calls.
Thanks,
Tom
> +//
> +typedef PACKED struct _SNP_SECRETS_OS_AREA {
> + UINT32 MsgSeqNum0;
> + UINT32 MsgSeqNum1;
> + UINT32 MsgSeqNum2;
> + UINT32 MsgSeqNum3;
> + UINT64 ApJumpTablePa;
> + UINT8 Reserved[40];
> + UINT8 GuestUsage[32];
> +} SNP_SECRETS_OS_AREA;
> +
> +#define VMPCK_KEY_LEN 32
> +
> +//
> +// SEV-SNP Secrets page
> +//
> +// As defined by "SEV-SNP Firmware ABI", revision 1.51, section 8.17.2.5,
> +// "PAGE_TYPE_SECRETS".
> +//
> +typedef PACKED struct _SNP_SECRETS_PAGE {
> + UINT32 Version;
> + UINT32 ImiEn : 1,
> + Reserved : 31;
> + UINT32 Fms;
> + UINT32 Reserved2;
> + UINT8 Gosvw[16];
> + UINT8 Vmpck0[VMPCK_KEY_LEN];
> + UINT8 Vmpck1[VMPCK_KEY_LEN];
> + UINT8 Vmpck2[VMPCK_KEY_LEN];
> + UINT8 Vmpck3[VMPCK_KEY_LEN];
> + SNP_SECRETS_OS_AREA OsArea;
> + UINT8 Reserved3[3840];
> +} SNP_SECRETS_PAGE;
> +
> +#endif
> diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
> index f1ebf9e251..a365bfcfe8 100644
> --- a/MdePkg/MdePkg.dec
> +++ b/MdePkg/MdePkg.dec
> @@ -2417,5 +2417,9 @@
> # @Prompt Memory encryption attribute
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0|UINT64|0x0000002e
>
> + ## This dynamic PCD indicates the location of the SEV-SNP secrets page.
> + # @Prompt SEV-SNP secrets page address
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0|UINT64|0x0000002f
> +
> [UserExtensions.TianoCore."ExtraFiles"]
> MdePkgExtra.uni
> diff --git a/OvmfPkg/AmdSev/AmdSevX64.dsc b/OvmfPkg/AmdSev/AmdSevX64.dsc
> index f0700035c1..02306945fd 100644
> --- a/OvmfPkg/AmdSev/AmdSevX64.dsc
> +++ b/OvmfPkg/AmdSev/AmdSevX64.dsc
> @@ -575,6 +575,9 @@
> # Set ConfidentialComputing defaults
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> !include OvmfPkg/OvmfTpmPcds.dsc.inc
>
> gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> diff --git a/OvmfPkg/CloudHv/CloudHvX64.dsc b/OvmfPkg/CloudHv/CloudHvX64.dsc
> index d1c85f60c7..7143698253 100644
> --- a/OvmfPkg/CloudHv/CloudHvX64.dsc
> +++ b/OvmfPkg/CloudHv/CloudHvX64.dsc
> @@ -630,6 +630,9 @@
> # Set ConfidentialComputing defaults
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> [PcdsDynamicHii]
> !include OvmfPkg/OvmfTpmPcdsHii.dsc.inc
>
> diff --git a/OvmfPkg/IntelTdx/IntelTdxX64.dsc b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
> index 80c331ea23..b19718c572 100644
> --- a/OvmfPkg/IntelTdx/IntelTdxX64.dsc
> +++ b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
> @@ -512,6 +512,9 @@
>
> gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> ################################################################################
> #
> # Components Section - list of all EDK II Modules needed by this Platform.
> diff --git a/OvmfPkg/Microvm/MicrovmX64.dsc b/OvmfPkg/Microvm/MicrovmX64.dsc
> index 20c3c9c4d8..42673c29ee 100644
> --- a/OvmfPkg/Microvm/MicrovmX64.dsc
> +++ b/OvmfPkg/Microvm/MicrovmX64.dsc
> @@ -613,6 +613,9 @@
> # Set ConfidentialComputing defaults
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> ################################################################################
> #
> # Components Section - list of all EDK II Modules needed by this Platform.
> diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
> index 533bbdb435..8ffef069a3 100644
> --- a/OvmfPkg/OvmfPkgIa32.dsc
> +++ b/OvmfPkg/OvmfPkgIa32.dsc
> @@ -649,6 +649,9 @@
> # Set ConfidentialComputing defaults
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> !if $(CSM_ENABLE) == FALSE
> gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> !endif
> diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
> index cb68e612bd..0b4d5001b2 100644
> --- a/OvmfPkg/OvmfPkgIa32X64.dsc
> +++ b/OvmfPkg/OvmfPkgIa32X64.dsc
> @@ -657,6 +657,9 @@
> # Set ConfidentialComputing defaults
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> !if $(CSM_ENABLE) == FALSE
> gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> !endif
> diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
> index 71526bba31..3a3223be6b 100644
> --- a/OvmfPkg/OvmfPkgX64.dsc
> +++ b/OvmfPkg/OvmfPkgX64.dsc
> @@ -680,6 +680,9 @@
> # Set ConfidentialComputing defaults
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
>
> + # Set SEV-SNP Secrets page address default
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> +
> !if $(CSM_ENABLE) == FALSE
> gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> !endif
> diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
> index 385562b44c..70352ca43b 100644
> --- a/OvmfPkg/PlatformPei/AmdSev.c
> +++ b/OvmfPkg/PlatformPei/AmdSev.c
> @@ -408,6 +408,11 @@ AmdSevInitialize (
> //
> if (MemEncryptSevSnpIsEnabled ()) {
> PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevSnp);
> + ASSERT_RETURN_ERROR (PcdStatus);
> + PcdStatus = PcdSet64S (
> + PcdSevSnpSecretsAddress,
> + (UINT64)(UINTN)PcdGet32 (PcdOvmfSnpSecretsBase)
> + );
> } else if (MemEncryptSevEsIsEnabled ()) {
> PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevEs);
> } else {
> diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
> index 00372fa0eb..c688e4ee24 100644
> --- a/OvmfPkg/PlatformPei/PlatformPei.inf
> +++ b/OvmfPkg/PlatformPei/PlatformPei.inf
> @@ -114,6 +114,7 @@
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr
> gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures
> gEfiMdeModulePkgTokenSpaceGuid.PcdTdxSharedBitMask
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress
>
> [FixedPcd]
> gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
> diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> index e1cd0b3500..d8cfddcd82 100644
> --- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> @@ -80,3 +80,4 @@
> gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard ## CONSUMES
> gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase ## CONSUMES
> gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr ## CONSUMES
> + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress ## CONSUMES
> diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> index 60d14a5a0e..6014dce136 100644
> --- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> @@ -15,6 +15,7 @@
> #include <Library/VmgExitLib.h>
> #include <Register/Amd/Fam17Msr.h>
> #include <Register/Amd/Ghcb.h>
> +#include <AmdSevSnpSecretsPage.h>
>
> #include <Protocol/Timer.h>
>
> @@ -216,6 +217,14 @@ GetSevEsAPMemory (
>
> DEBUG ((DEBUG_INFO, "Dxe: SevEsAPMemory = %lx\n", (UINTN)StartAddress));
>
> + if (ConfidentialComputingGuestHas (CCAttrAmdSevSnp)) {
> + SNP_SECRETS_PAGE *Secrets = (SNP_SECRETS_PAGE *)(INTN)PcdGet64 (PcdSevSnpSecretsAddress);
> +
> + Secrets->OsArea.ApJumpTablePa = (UINT64)(UINTN)StartAddress;
> +
> + return (UINTN)StartAddress;
> + }
> +
> //
> // Save the SevEsAPMemory as the AP jump table.
> //
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On Fri, May 13, 2022 at 08:56:06AM -0500, Tom Lendacky wrote:
> On 5/13/22 08:22, Michael Roth wrote:
> > A full-featured SEV-SNP guest will not rely on the AP jump table, and
> > will instead use the AP Creation interface defined by the GHCB. However,
> > a guest is still allowed to use the AP jump table if desired.
> >
> > However, unlike with SEV-ES guests, SEV-SNP guests should not
> > store/retrieve the jump table address via GHCB requests to the
> > hypervisor, they should instead store/retrieve it via the SEV-SNP
> > secrets page. Implement the store side of this for OVMF.
> >
> > Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
> > Signed-off-by: Michael Roth <michael.roth@amd.com>
> > ---
> > MdePkg/Include/AmdSevSnpSecretsPage.h | 51 +++++++++++++++++++
> > MdePkg/MdePkg.dec | 4 ++
> > OvmfPkg/AmdSev/AmdSevX64.dsc | 3 ++
> > OvmfPkg/CloudHv/CloudHvX64.dsc | 3 ++
> > OvmfPkg/IntelTdx/IntelTdxX64.dsc | 3 ++
> > OvmfPkg/Microvm/MicrovmX64.dsc | 3 ++
> > OvmfPkg/OvmfPkgIa32.dsc | 3 ++
> > OvmfPkg/OvmfPkgIa32X64.dsc | 3 ++
> > OvmfPkg/OvmfPkgX64.dsc | 3 ++
> > OvmfPkg/PlatformPei/AmdSev.c | 5 ++
> > OvmfPkg/PlatformPei/PlatformPei.inf | 1 +
> > UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 +
> > UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 9 ++++
> > 13 files changed, 92 insertions(+)
> > create mode 100644 MdePkg/Include/AmdSevSnpSecretsPage.h
> >
> > diff --git a/MdePkg/Include/AmdSevSnpSecretsPage.h b/MdePkg/Include/AmdSevSnpSecretsPage.h
> > new file mode 100644
> > index 0000000000..55c7475ff0
> > --- /dev/null
> > +++ b/MdePkg/Include/AmdSevSnpSecretsPage.h
>
> Just wondering if this should be in the MdePkg/Include/Register/Amd directory?
That might be the better spot. I was thinking that was reserved for
definitions related to specific registers, but I somehow missed that it's
also where the GHCB struct is defined. So probably makes sense to put
the secrets page definition there as well.
>
> > @@ -0,0 +1,51 @@
> > +/** @file
> > +Definitions for AMD SEV-SNP Secrets Page
> > +
> > +Copyright (c) 2022 AMD Inc. All rights reserved.<BR>
> > +SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#ifndef AMD_SEV_SNP_SECRETS_PAGE_H_
> > +#define AMD_SEV_SNP_SECRETS_PAGE_H_
> > +
> > +//
> > +// OS-defined area of secrets page
> > +//
> > +// As defined by "SEV-ES Guest-Hypervisor Communication Block Standardization",
> > +// revision 1.50, section 2.7, "SEV-SNP Secrets Page".
>
> This should be using at least revision 2.00 (if not 2.01 which is in the
> process of being published). 2.01 uses some of the 40-byte reserved area to
> hold the high 32-bits of the message sequence numbers (since the SNP API
> changed after the GHCB spec was published to convert the sequence numbers
> from 32-bit to 64-bit). The changes are backwards compatible, so not a big
> deal as to whether to implement since OVMF doesn't make any guest request
> API calls.
Okay, will go ahead and update these while I'm at it and send a v2.
Thanks!
-Mike
>
> Thanks,
> Tom
>
> > +//
> > +typedef PACKED struct _SNP_SECRETS_OS_AREA {
> > + UINT32 MsgSeqNum0;
> > + UINT32 MsgSeqNum1;
> > + UINT32 MsgSeqNum2;
> > + UINT32 MsgSeqNum3;
> > + UINT64 ApJumpTablePa;
> > + UINT8 Reserved[40];
> > + UINT8 GuestUsage[32];
> > +} SNP_SECRETS_OS_AREA;
> > +
> > +#define VMPCK_KEY_LEN 32
> > +
> > +//
> > +// SEV-SNP Secrets page
> > +//
> > +// As defined by "SEV-SNP Firmware ABI", revision 1.51, section 8.17.2.5,
> > +// "PAGE_TYPE_SECRETS".
> > +//
> > +typedef PACKED struct _SNP_SECRETS_PAGE {
> > + UINT32 Version;
> > + UINT32 ImiEn : 1,
> > + Reserved : 31;
> > + UINT32 Fms;
> > + UINT32 Reserved2;
> > + UINT8 Gosvw[16];
> > + UINT8 Vmpck0[VMPCK_KEY_LEN];
> > + UINT8 Vmpck1[VMPCK_KEY_LEN];
> > + UINT8 Vmpck2[VMPCK_KEY_LEN];
> > + UINT8 Vmpck3[VMPCK_KEY_LEN];
> > + SNP_SECRETS_OS_AREA OsArea;
> > + UINT8 Reserved3[3840];
> > +} SNP_SECRETS_PAGE;
> > +
> > +#endif
> > diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
> > index f1ebf9e251..a365bfcfe8 100644
> > --- a/MdePkg/MdePkg.dec
> > +++ b/MdePkg/MdePkg.dec
> > @@ -2417,5 +2417,9 @@
> > # @Prompt Memory encryption attribute
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0|UINT64|0x0000002e
> > + ## This dynamic PCD indicates the location of the SEV-SNP secrets page.
> > + # @Prompt SEV-SNP secrets page address
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0|UINT64|0x0000002f
> > +
> > [UserExtensions.TianoCore."ExtraFiles"]
> > MdePkgExtra.uni
> > diff --git a/OvmfPkg/AmdSev/AmdSevX64.dsc b/OvmfPkg/AmdSev/AmdSevX64.dsc
> > index f0700035c1..02306945fd 100644
> > --- a/OvmfPkg/AmdSev/AmdSevX64.dsc
> > +++ b/OvmfPkg/AmdSev/AmdSevX64.dsc
> > @@ -575,6 +575,9 @@
> > # Set ConfidentialComputing defaults
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > !include OvmfPkg/OvmfTpmPcds.dsc.inc
> > gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> > diff --git a/OvmfPkg/CloudHv/CloudHvX64.dsc b/OvmfPkg/CloudHv/CloudHvX64.dsc
> > index d1c85f60c7..7143698253 100644
> > --- a/OvmfPkg/CloudHv/CloudHvX64.dsc
> > +++ b/OvmfPkg/CloudHv/CloudHvX64.dsc
> > @@ -630,6 +630,9 @@
> > # Set ConfidentialComputing defaults
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > [PcdsDynamicHii]
> > !include OvmfPkg/OvmfTpmPcdsHii.dsc.inc
> > diff --git a/OvmfPkg/IntelTdx/IntelTdxX64.dsc b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
> > index 80c331ea23..b19718c572 100644
> > --- a/OvmfPkg/IntelTdx/IntelTdxX64.dsc
> > +++ b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
> > @@ -512,6 +512,9 @@
> > gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > ################################################################################
> > #
> > # Components Section - list of all EDK II Modules needed by this Platform.
> > diff --git a/OvmfPkg/Microvm/MicrovmX64.dsc b/OvmfPkg/Microvm/MicrovmX64.dsc
> > index 20c3c9c4d8..42673c29ee 100644
> > --- a/OvmfPkg/Microvm/MicrovmX64.dsc
> > +++ b/OvmfPkg/Microvm/MicrovmX64.dsc
> > @@ -613,6 +613,9 @@
> > # Set ConfidentialComputing defaults
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > ################################################################################
> > #
> > # Components Section - list of all EDK II Modules needed by this Platform.
> > diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
> > index 533bbdb435..8ffef069a3 100644
> > --- a/OvmfPkg/OvmfPkgIa32.dsc
> > +++ b/OvmfPkg/OvmfPkgIa32.dsc
> > @@ -649,6 +649,9 @@
> > # Set ConfidentialComputing defaults
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > !if $(CSM_ENABLE) == FALSE
> > gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> > !endif
> > diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
> > index cb68e612bd..0b4d5001b2 100644
> > --- a/OvmfPkg/OvmfPkgIa32X64.dsc
> > +++ b/OvmfPkg/OvmfPkgIa32X64.dsc
> > @@ -657,6 +657,9 @@
> > # Set ConfidentialComputing defaults
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > !if $(CSM_ENABLE) == FALSE
> > gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> > !endif
> > diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
> > index 71526bba31..3a3223be6b 100644
> > --- a/OvmfPkg/OvmfPkgX64.dsc
> > +++ b/OvmfPkg/OvmfPkgX64.dsc
> > @@ -680,6 +680,9 @@
> > # Set ConfidentialComputing defaults
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr|0
> > + # Set SEV-SNP Secrets page address default
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress|0
> > +
> > !if $(CSM_ENABLE) == FALSE
> > gEfiMdePkgTokenSpaceGuid.PcdFSBClock|100000000
> > !endif
> > diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
> > index 385562b44c..70352ca43b 100644
> > --- a/OvmfPkg/PlatformPei/AmdSev.c
> > +++ b/OvmfPkg/PlatformPei/AmdSev.c
> > @@ -408,6 +408,11 @@ AmdSevInitialize (
> > //
> > if (MemEncryptSevSnpIsEnabled ()) {
> > PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevSnp);
> > + ASSERT_RETURN_ERROR (PcdStatus);
> > + PcdStatus = PcdSet64S (
> > + PcdSevSnpSecretsAddress,
> > + (UINT64)(UINTN)PcdGet32 (PcdOvmfSnpSecretsBase)
> > + );
> > } else if (MemEncryptSevEsIsEnabled ()) {
> > PcdStatus = PcdSet64S (PcdConfidentialComputingGuestAttr, CCAttrAmdSevEs);
> > } else {
> > diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
> > index 00372fa0eb..c688e4ee24 100644
> > --- a/OvmfPkg/PlatformPei/PlatformPei.inf
> > +++ b/OvmfPkg/PlatformPei/PlatformPei.inf
> > @@ -114,6 +114,7 @@
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr
> > gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures
> > gEfiMdeModulePkgTokenSpaceGuid.PcdTdxSharedBitMask
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress
> > [FixedPcd]
> > gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
> > diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> > index e1cd0b3500..d8cfddcd82 100644
> > --- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> > +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> > @@ -80,3 +80,4 @@
> > gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard ## CONSUMES
> > gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase ## CONSUMES
> > gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr ## CONSUMES
> > + gEfiMdePkgTokenSpaceGuid.PcdSevSnpSecretsAddress ## CONSUMES
> > diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> > index 60d14a5a0e..6014dce136 100644
> > --- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> > +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> > @@ -15,6 +15,7 @@
> > #include <Library/VmgExitLib.h>
> > #include <Register/Amd/Fam17Msr.h>
> > #include <Register/Amd/Ghcb.h>
> > +#include <AmdSevSnpSecretsPage.h>
> > #include <Protocol/Timer.h>
> > @@ -216,6 +217,14 @@ GetSevEsAPMemory (
> > DEBUG ((DEBUG_INFO, "Dxe: SevEsAPMemory = %lx\n", (UINTN)StartAddress));
> > + if (ConfidentialComputingGuestHas (CCAttrAmdSevSnp)) {
> > + SNP_SECRETS_PAGE *Secrets = (SNP_SECRETS_PAGE *)(INTN)PcdGet64 (PcdSevSnpSecretsAddress);
> > +
> > + Secrets->OsArea.ApJumpTablePa = (UINT64)(UINTN)StartAddress;
> > +
> > + return (UINTN)StartAddress;
> > + }
> > +
> > //
> > // Save the SevEsAPMemory as the AP jump table.
> > //
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