@@ -622,6 +622,12 @@
#define ID_AA64DFR0_TRACEVER_SHIFT 4
#define ID_AA64DFR0_DEBUGVER_SHIFT 0
+#define ID_AA64DFR0_PMUVER_8_1 0x4
+
+#define ID_DFR0_PERFMON_SHIFT 24
+
+#define ID_DFR0_PERFMON_8_1 0x4
+
#define ID_ISAR5_RDM_SHIFT 24
#define ID_ISAR5_CRC32_SHIFT 16
#define ID_ISAR5_SHA2_SHIFT 12
@@ -1049,6 +1049,16 @@ static u64 read_id_reg(struct sys_reg_desc const *r, bool raz)
kvm_debug("LORegions unsupported for guests, suppressing\n");
val &= ~(0xfUL << ID_AA64MMFR1_LOR_SHIFT);
+ } else if (id == SYS_ID_AA64DFR0_EL1) {
+ /* Limit guests to PMUv3 for ARMv8.1 */
+ val = cpuid_feature_cap_perfmon_field(val,
+ ID_AA64DFR0_PMUVER_SHIFT,
+ ID_AA64DFR0_PMUVER_8_1);
+ } else if (id == SYS_ID_DFR0_EL1) {
+ /* Limit guests to PMUv3 for ARMv8.1 */
+ val = cpuid_feature_cap_perfmon_field(val,
+ ID_DFR0_PERFMON_SHIFT,
+ ID_DFR0_PERFMON_8_1);
}
return val;