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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>
This commit is contained in:
Brijesh Singh 2021-12-09 11:27:37 +08:00 committed by mergify[bot]
parent 34819f2cac
commit d9822304ce
4 changed files with 85 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
OvmfPkg/Include/Library/MemEncryptSevLib.h
View File

@ -47,6 +47,18 @@ typedef enum {
MemEncryptSevAddressRangeError,
} MEM_ENCRYPT_SEV_ADDRESS_RANGE_STATE;
/**
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
);
/**
Returns a boolean to indicate whether SEV-ES is enabled.

27
OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLibInternal.c
View File

@ -19,6 +19,7 @@
STATIC BOOLEAN mSevStatus = FALSE;
STATIC BOOLEAN mSevEsStatus = FALSE;
STATIC BOOLEAN mSevSnpStatus = FALSE;
STATIC BOOLEAN mSevStatusChecked = FALSE;
STATIC UINT64 mSevEncryptionMask = 0;
@ -82,11 +83,37 @@ 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.

27
OvmfPkg/Library/BaseMemEncryptSevLib/PeiMemEncryptSevLibInternal.c
View File

@ -19,6 +19,7 @@
STATIC BOOLEAN mSevStatus = FALSE;
STATIC BOOLEAN mSevEsStatus = FALSE;
STATIC BOOLEAN mSevSnpStatus = FALSE;
STATIC BOOLEAN mSevStatusChecked = FALSE;
STATIC UINT64 mSevEncryptionMask = 0;
@ -82,11 +83,37 @@ 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.

19
OvmfPkg/Library/BaseMemEncryptSevLib/SecMemEncryptSevLibInternal.c
View File

@ -62,6 +62,25 @@ InternalMemEncryptSevStatus (
return ReadSevMsr ? AsmReadMsr32 (MSR_SEV_STATUS) : 0;
}
/**
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.