target/arm: Provide ARMv8.4-PMU in '-cpu max'

Set the ID register bits to provide ARMv8.4-PMU (and implicitly
also ARMv8.1-PMU) in the 'max' CPU.
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 20200214175116.9164-16-peter.maydell@linaro.org

target/arm/cpu64.c

@@ -703,6 +703,14 @@ static void aarch64_max_initfn(Object *obj)
         u = FIELD_DP32(u, ID_MMFR3, PAN, 2); /* ATS1E1 */
         cpu->id_mmfr3 = u;
 
+        u = cpu->isar.id_aa64dfr0;
+        u = FIELD_DP64(u, ID_AA64DFR0, PMUVER, 5); /* v8.4-PMU */
+        cpu->isar.id_aa64dfr0 = u;
+
+        u = cpu->isar.id_dfr0;
+        u = FIELD_DP32(u, ID_DFR0, PERFMON, 5); /* v8.4-PMU */
+        cpu->isar.id_dfr0 = u;
+
         /*
          * FIXME: We do not yet support ARMv8.2-fp16 for AArch32 yet,
          * so do not set MVFR1.FPHP.  Strictly speaking this is not legal,