[edk2-devel] [PATCH v4 4/4] UefiCpuPkg: Store SEV-SNP AP jump table in the secrets page
Roth, Michael via groups.io
Michael.Roth=amd.com at groups.io
Wed Dec 21 15:50:47 UTC 2022
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 at amd.com>
Reviewed-by: Tom Lendacky <thomas.lendacky at amd.com>
Signed-off-by: Michael Roth <michael.roth at amd.com>
---
UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 +
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 10 ++++++++++
2 files changed, 11 insertions(+)
diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
index 8c8b81d933..0c36538d59 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
@@ -85,3 +85,4 @@
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 beab06a5b1..8edc612772 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
@@ -15,6 +15,7 @@
#include <Library/CcExitLib.h>
#include <Register/Amd/Fam17Msr.h>
#include <Register/Amd/Ghcb.h>
+#include <Register/Amd/SnpSecretsPage.h>
#include <Protocol/Timer.h>
@@ -217,6 +218,15 @@ GetSevEsAPMemory (
DEBUG ((DEBUG_INFO, "Dxe: SevEsAPMemory = %lx\n", (UINTN)StartAddress));
+ if (ConfidentialComputingGuestHas (CCAttrAmdSevSnp)) {
+ SNP_SECRETS_PAGE *Secrets;
+
+ 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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