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| author | Brijesh Singh <brijesh.singh@amd.com> | 2021-12-09 11:27:37 +0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-12-09 06:28:10 +0000 |
| commit | d9822304ce0075b1075edf93cc6e2514685b5212 (patch) | |
| tree | 9aa6fd707357436ba72c88aeeb1a2cc0a960a67c /OvmfPkg/Library/BaseMemEncryptSevLib | |
| parent | 34819f2caccb061a982e77fd8ba908632cb9dcaf (diff) | |
| download | edk2-d9822304ce0075b1075edf93cc6e2514685b5212.tar.gz edk2-d9822304ce0075b1075edf93cc6e2514685b5212.tar.bz2 edk2-d9822304ce0075b1075edf93cc6e2514685b5212.zip | |
OvmfPkg/MemEncryptSevLib: add MemEncryptSevSnpEnabled()
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275
Create a function that can be used to determine if VM is running as an
SEV-SNP guest.
Cc: Michael Roth <michael.roth@amd.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Diffstat (limited to 'OvmfPkg/Library/BaseMemEncryptSevLib')
3 files changed, 73 insertions, 0 deletions
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c b/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c index 4fee7b2ab3..15fcd55295 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c @@ -19,6 +19,7 @@ STATIC BOOLEAN mSevStatus = FALSE;
STATIC BOOLEAN mSevEsStatus = FALSE;
+STATIC BOOLEAN mSevSnpStatus = FALSE;
STATIC BOOLEAN mSevStatusChecked = FALSE;
STATIC UINT64 mSevEncryptionMask = 0;
@@ -82,12 +83,38 @@ InternalMemEncryptSevStatus ( if (Msr.Bits.SevEsBit) {
mSevEsStatus = TRUE;
}
+
+ //
+ // Check MSR_0xC0010131 Bit 2 (Sev-Snp Enabled)
+ //
+ if (Msr.Bits.SevSnpBit) {
+ mSevSnpStatus = TRUE;
+ }
}
mSevStatusChecked = TRUE;
}
/**
+ Returns a boolean to indicate whether SEV-SNP is enabled.
+
+ @retval TRUE SEV-SNP is enabled
+ @retval FALSE SEV-SNP is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevSnpIsEnabled (
+ VOID
+ )
+{
+ if (!mSevStatusChecked) {
+ InternalMemEncryptSevStatus ();
+ }
+
+ return mSevSnpStatus;
+}
+
+/**
Returns a boolean to indicate whether SEV-ES is enabled.
@retval TRUE SEV-ES is enabled
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c index c4aa74a0a2..d68ff08c3e 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c @@ -19,6 +19,7 @@ STATIC BOOLEAN mSevStatus = FALSE;
STATIC BOOLEAN mSevEsStatus = FALSE;
+STATIC BOOLEAN mSevSnpStatus = FALSE;
STATIC BOOLEAN mSevStatusChecked = FALSE;
STATIC UINT64 mSevEncryptionMask = 0;
@@ -82,12 +83,38 @@ InternalMemEncryptSevStatus ( if (Msr.Bits.SevEsBit) {
mSevEsStatus = TRUE;
}
+
+ //
+ // Check MSR_0xC0010131 Bit 2 (Sev-Snp Enabled)
+ //
+ if (Msr.Bits.SevSnpBit) {
+ mSevSnpStatus = TRUE;
+ }
}
mSevStatusChecked = TRUE;
}
/**
+ Returns a boolean to indicate whether SEV-SNP is enabled.
+
+ @retval TRUE SEV-SNP is enabled
+ @retval FALSE SEV-SNP is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevSnpIsEnabled (
+ VOID
+ )
+{
+ if (!mSevStatusChecked) {
+ InternalMemEncryptSevStatus ();
+ }
+
+ return mSevSnpStatus;
+}
+
+/**
Returns a boolean to indicate whether SEV-ES is enabled.
@retval TRUE SEV-ES is enabled
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c b/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c index b5b3656414..5d912b2a4a 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c @@ -63,6 +63,25 @@ InternalMemEncryptSevStatus ( }
/**
+ Returns a boolean to indicate whether SEV-SNP is enabled.
+
+ @retval TRUE SEV-SNP is enabled
+ @retval FALSE SEV-SNP is not enabled
+**/
+BOOLEAN
+EFIAPI
+MemEncryptSevSnpIsEnabled (
+ VOID
+ )
+{
+ MSR_SEV_STATUS_REGISTER Msr;
+
+ Msr.Uint32 = InternalMemEncryptSevStatus ();
+
+ return Msr.Bits.SevSnpBit ? TRUE : FALSE;
+}
+
+/**
Returns a boolean to indicate whether SEV-ES is enabled.
@retval TRUE SEV-ES is enabled
|