target/arm: Enable FEAT_LSE128 for -cpu max

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20250815122653.701782-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/system/arm/emulation.rst

@@ -89,6 +89,7 @@ the following architecture extensions:
 - FEAT_LRCPC2 (Load-acquire RCpc instructions v2)
 - FEAT_LSE (Large System Extensions)
 - FEAT_LSE2 (Large System Extensions v2)
+- FEAT_LSE128 (128-bit Atomics)
 - FEAT_LVA (Large Virtual Address space)
 - FEAT_MixedEnd (Mixed-endian support)
 - FEAT_MixedEndEL0 (Mixed-endian support at EL0)

linux-user/aarch64/elfload.c

@@ -216,6 +216,7 @@ abi_ulong get_elf_hwcap2(CPUState *cs)
     GET_FEATURE_ID(aa64_sme_f16f16, ARM_HWCAP2_A64_SME_F16F16);
     GET_FEATURE_ID(aa64_sve_b16b16, ARM_HWCAP2_A64_SVE_B16B16);
     GET_FEATURE_ID(aa64_cssc, ARM_HWCAP2_A64_CSSC);
+    GET_FEATURE_ID(aa64_lse128, ARM_HWCAP2_A64_LSE128);
 
     return hwcaps;
 }

target/arm/tcg/cpu64.c

@@ -1145,7 +1145,7 @@ void aarch64_max_tcg_initfn(Object *obj)
     t = FIELD_DP64(t, ID_AA64ISAR0, SHA1, 1);     /* FEAT_SHA1 */
     t = FIELD_DP64(t, ID_AA64ISAR0, SHA2, 2);     /* FEAT_SHA512 */
     t = FIELD_DP64(t, ID_AA64ISAR0, CRC32, 1);    /* FEAT_CRC32 */
-    t = FIELD_DP64(t, ID_AA64ISAR0, ATOMIC, 2);   /* FEAT_LSE */
+    t = FIELD_DP64(t, ID_AA64ISAR0, ATOMIC, 3);   /* FEAT_LSE, FEAT_LSE128 */
     t = FIELD_DP64(t, ID_AA64ISAR0, RDM, 1);      /* FEAT_RDM */
     t = FIELD_DP64(t, ID_AA64ISAR0, SHA3, 1);     /* FEAT_SHA3 */
     t = FIELD_DP64(t, ID_AA64ISAR0, SM3, 1);      /* FEAT_SM3 */