abi: parse PlatformInfo form v3 report

Signed-off-by: Paul Meyer <[email protected]>

Author: katexochen

abi/abi.go

@@ -73,7 +73,7 @@ const (
 	policyDebugBit        = 19
 	policySingleSocketBit = 20
 
-	maxPlatformInfoBit = 1
+	maxPlatformInfoBit = 4
 
 	signatureOffset = 0x2A0
 	ecdsaRSsize     = 72 // From the ECDSA-P384-SHA384 format in SEV SNP API specification.
@@ -186,6 +186,13 @@ type SnpPlatformInfo struct {
 	// TSMEEnabled represents if the platform that produced the attestation report has transparent
 	// secure memory encryption (TSME) enabled.
 	TSMEEnabled bool
+	// ECCEnabled indicates that the platform is using error correcting codes for memory.
+	// Present when EccMemReporting feature bit is set.
+	ECCEnabled bool
+	// RAPLDisabled indicates that the RAPL is disabled.
+	RAPLDisabled bool
+	// CiphertextHidingDRAMEnabled indicates cypher text hiding is enabled for DRAM.
+	CiphertextHidingDRAMEnabled bool
 }
 
 // SnpPolicy represents the bitmask guest policy that governs the VM's behavior from launch.
@@ -244,8 +251,11 @@ func SnpPolicyToBytes(policy SnpPolicy) uint64 {
 // unrecognized bits.
 func ParseSnpPlatformInfo(platformInfo uint64) (SnpPlatformInfo, error) {
 	result := SnpPlatformInfo{
-		SMTEnabled:  (platformInfo & (1 << 0)) != 0,
-		TSMEEnabled: (platformInfo & (1 << 1)) != 0,
+		SMTEnabled:                  (platformInfo & (1 << 0)) != 0,
+		TSMEEnabled:                 (platformInfo & (1 << 1)) != 0,
+		ECCEnabled:                  (platformInfo & (1 << 2)) != 0,
+		RAPLDisabled:                (platformInfo & (1 << 3)) != 0,
+		CiphertextHidingDRAMEnabled: (platformInfo & (1 << 4)) != 0,
 	}
 	reserved := platformInfo & ^uint64((1<<(maxPlatformInfoBit+1))-1)
 	if reserved != 0 {

abi/abi_test.go

@@ -236,8 +236,16 @@ func TestSnpPlatformInfo(t *testing.T) {
 			want:  SnpPlatformInfo{TSMEEnabled: true, SMTEnabled: true},
 		},
 		{
-			input:   4,
-			wantErr: "unrecognized platform info bit(s): 0x4",
+			input: 21,
+			want: SnpPlatformInfo{
+				SMTEnabled:                  true,
+				ECCEnabled:                  true,
+				CiphertextHidingDRAMEnabled: true,
+			},
+		},
+		{
+			input:   32,
+			wantErr: "unrecognized platform info bit(s): 0x20",
 		},
 	}
 	for _, tc := range tests {