From: Ashish Kalra <ashish.ka...@amd.com>
Add support to check if we are running inside KVM HVM and
KVM HVM supports SEV Live Migration feature.
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Ard Biesheuvel <ard.biesheu...@arm.com>
Signed-off-by: Ashish Kalra <ashish.ka...@amd.com>
---
OvmfPkg/Include/Library/MemEncryptSevLib.h | 12
+++++
OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c | 41
++++++++++++++
OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.c | 57
++++++++++++++++++++
OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.h | 31
+++++++++++
OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c | 41
++++++++++++++
OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c | 18
+++++++
6 files changed, 200 insertions(+)
diff --git a/OvmfPkg/Include/Library/MemEncryptSevLib.h
b/OvmfPkg/Include/Library/MemEncryptSevLib.h
index 76d06c206c..b619cadf51 100644
--- a/OvmfPkg/Include/Library/MemEncryptSevLib.h
+++ b/OvmfPkg/Include/Library/MemEncryptSevLib.h
@@ -90,6 +90,18 @@ MemEncryptSevIsEnabled (
VOID
);
+/**
+ Returns a boolean to indicate whether SEV live migration is enabled.
+
+ @retval TRUE SEV live migration is enabled
+ @retval FALSE SEV live migration is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevLiveMigrationIsEnabled (
+ VOID
+ );
+
/**
This function clears memory encryption bit for the memory region specified by
BaseAddress and NumPages from the current page table context.
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c
b/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c
index 2816f859a0..1a99d38866 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c
@@ -17,9 +17,13 @@
#include <Register/Cpuid.h>
#include <Uefi/UefiBaseType.h>
+#include "PeiDxeMemEncryptSevLibInternal.h"
+
STATIC BOOLEAN mSevStatus = FALSE;
STATIC BOOLEAN mSevEsStatus = FALSE;
STATIC BOOLEAN mSevStatusChecked = FALSE;
+STATIC BOOLEAN mSevLiveMigrationStatus = FALSE;
+STATIC BOOLEAN mSevLiveMigrationStatusChecked = FALSE;
STATIC UINT64 mSevEncryptionMask = 0;
STATIC BOOLEAN mSevEncryptionMaskSaved = FALSE;
@@ -87,6 +91,24 @@ InternalMemEncryptSevStatus (
mSevStatusChecked = TRUE;
}
+/**
+ Figures out if we are running inside KVM HVM and
+ KVM HVM supports SEV Live Migration feature.
+**/
+STATIC
+VOID
+EFIAPI
+InternalDetectSevLiveMigrationFeature (
+ VOID
+ )
+{
+ if (KvmDetectSevLiveMigrationFeature ()) {
+ mSevLiveMigrationStatus = TRUE;
+ }
+
+ mSevLiveMigrationStatusChecked = TRUE;
+}
+
/**
Returns a boolean to indicate whether SEV-ES is enabled.
@@ -125,6 +147,25 @@ MemEncryptSevIsEnabled (
return mSevStatus;
}
+/**
+ Returns a boolean to indicate whether SEV live migration is enabled.
+
+ @retval TRUE SEV live migration is enabled
+ @retval FALSE SEV live migration is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevLiveMigrationIsEnabled (
+ VOID
+ )
+{
+ if (!mSevLiveMigrationStatusChecked) {
+ InternalDetectSevLiveMigrationFeature ();
+ }
+
+ return mSevLiveMigrationStatus;
+}
+
/**
Returns the SEV encryption mask.
diff --git
a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.c
b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.c
index b4a9f464e2..30f2d90889 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.c
@@ -16,6 +16,8 @@
#include <Register/SmramSaveStateMap.h>
#include <Uefi/UefiBaseType.h>
+#include "PeiDxeMemEncryptSevLibInternal.h"
+
/**
Locate the page range that covers the initial (pre-SMBASE-relocation) SMRAM
Save State Map.
@@ -61,3 +63,58 @@ MemEncryptSevLocateInitialSmramSaveStateMapPages (
return RETURN_SUCCESS;
}
+
+/**
+ Figures out if we are running inside KVM HVM and
+ KVM HVM supports SEV Live Migration feature.
+
+ @retval TRUE SEV live migration is supported.
+ @retval FALSE SEV live migration is not supported.
+**/
+BOOLEAN
+EFIAPI
+KvmDetectSevLiveMigrationFeature (
+ VOID
+ )
+{
+ CHAR8 Signature[13];
+ UINT32 mKvmLeaf;
+ UINT32 RegEax;
+ UINT32 RegEbx;
+ UINT32 RegEcx;
+ UINT32 RegEdx;
+
+ Signature[12] = '\0';
+ for (mKvmLeaf = 0x40000000; mKvmLeaf < 0x40010000; mKvmLeaf += 0x100) {
+ AsmCpuid (
+ mKvmLeaf,
+ NULL,
+ (UINT32 *) &Signature[0],
+ (UINT32 *) &Signature[4],
+ (UINT32 *) &Signature[8]);
+
+ if (AsciiStrCmp (Signature, "KVMKVMKVM") == 0) {
+ DEBUG ((
+ DEBUG_INFO,
+ "%a: KVM Detected, signature = %a\n",
+ __FUNCTION__,
+ Signature
+ ));
+
+ RegEax = mKvmLeaf + 1;
+ RegEcx = 0;
+ AsmCpuid (mKvmLeaf + 1, &RegEax, &RegEbx, &RegEcx, &RegEdx);
+ if ((RegEax & KVM_FEATURE_MIGRATION_CONTROL) != 0) {
+ DEBUG ((
+ DEBUG_INFO,
+ "%a: SEV Live Migration feature supported\n",
+ __FUNCTION__
+ ));
+
+ return TRUE;
+ }
+ }
+ }
+
+ return FALSE;
+}
diff --git
a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.h
b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.h
new file mode 100644
index 0000000000..30cf5de995
--- /dev/null
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiDxeMemEncryptSevLibInternal.h
@@ -0,0 +1,31 @@
+/** @file
+
+ Secure Encrypted Virtualization (SEV) library helper function
+
+ Copyright (c) 2021, AMD Incorporated. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PEI_DXE_MEM_ENCRYPT_SEV_LIB_INTERNAL_H_
+#define PEI_DXE_MEM_ENCRYPT_SEV_LIB_INTERNAL_H_
+
+#include <Library/BaseLib.h>
+
+#define KVM_FEATURE_MIGRATION_CONTROL BIT17
+
+/**
+ Figures out if we are running inside KVM HVM and
+ KVM HVM supports SEV Live Migration feature.
+
+ @retval TRUE SEV live migration is supported.
+ @retval FALSE SEV live migration is not supported.
+**/
+BOOLEAN
+EFIAPI
+KvmDetectSevLiveMigrationFeature(
+ VOID
+ );
+
+#endif // PEI_DXE_MEM_ENCRYPT_SEV_LIB_INTERNAL_H_
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c
b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c
index e2fd109d12..9293b5652d 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c
@@ -17,9 +17,13 @@
#include <Register/Cpuid.h>
#include <Uefi/UefiBaseType.h>
+#include "PeiDxeMemEncryptSevLibInternal.h"
+
STATIC BOOLEAN mSevStatus = FALSE;
STATIC BOOLEAN mSevEsStatus = FALSE;
STATIC BOOLEAN mSevStatusChecked = FALSE;
+STATIC BOOLEAN mSevLiveMigrationStatus = FALSE;
+STATIC BOOLEAN mSevLiveMigrationStatusChecked = FALSE;
STATIC UINT64 mSevEncryptionMask = 0;
STATIC BOOLEAN mSevEncryptionMaskSaved = FALSE;
@@ -87,6 +91,24 @@ InternalMemEncryptSevStatus (
mSevStatusChecked = TRUE;
}
+/**
+ Figures out if we are running inside KVM HVM and
+ KVM HVM supports SEV Live Migration feature.
+**/
+STATIC
+VOID
+EFIAPI
+InternalDetectSevLiveMigrationFeature (
+ VOID
+ )
+{
+ if (KvmDetectSevLiveMigrationFeature ()) {
+ mSevLiveMigrationStatus = TRUE;
+ }
+
+ mSevLiveMigrationStatusChecked = TRUE;
+}
+
/**
Returns a boolean to indicate whether SEV-ES is enabled.
@@ -125,6 +147,25 @@ MemEncryptSevIsEnabled (
return mSevStatus;
}
+/**
+ Returns a boolean to indicate whether SEV live migration is enabled.
+
+ @retval TRUE SEV live migration is enabled
+ @retval FALSE SEV live migration is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevLiveMigrationIsEnabled (
+ VOID
+ )
+{
+ if (!mSevLiveMigrationStatusChecked) {
+ InternalDetectSevLiveMigrationFeature ();
+ }
+
+ return mSevLiveMigrationStatus;
+}
+
/**
Returns the SEV encryption mask.
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c
b/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c
index 56d8f3f318..d9f7befcd2 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c
@@ -100,6 +100,24 @@ MemEncryptSevIsEnabled (
return Msr.Bits.SevBit ? TRUE : FALSE;
}
+/**
+ Returns a boolean to indicate whether SEV live migration is enabled.
+
+ @retval TRUE SEV live migration is enabled
+ @retval FALSE SEV live migration is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevLiveMigrationIsEnabled (
+ VOID
+ )
+{
+ //
+ // Not used in SEC phase.
+ //
+ return FALSE;
+}
+
/**
Returns the SEV encryption mask.
--
2.17.1
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