Advertise FEAT_MEC in AA64MMFR3 ID register for the Arm64 cpu max as a
first step to fully support FEAT_MEC.
The FEAT_MEC is an extension to FEAT_RME that implements multiple
Memory Encryption Contexts (MEC) so the memory in a realm can be
encrypted and accessing it from the wrong encryption context is not
possible. An encryption context allow the selection of a memory
encryption engine.
At this point, no real memory encryption is supported, but software
stacks that rely on FEAT_MEC should work properly.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250711140828.1714666-7-gustavo.romero@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
---
docs/system/arm/emulation.rst | 3 +++
target/arm/tcg/cpu64.c | 1 +
2 files changed, 4 insertions(+)
diff --git a/docs/system/arm/emulation.rst b/docs/system/arm/emulation.rst
index 6b04c96c8c..0876a232c6 100644
--- a/docs/system/arm/emulation.rst
+++ b/docs/system/arm/emulation.rst
@@ -92,6 +92,9 @@ the following architecture extensions:
- FEAT_LSE2 (Large System Extensions v2)
- FEAT_LSE128 (128-bit Atomics)
- FEAT_LVA (Large Virtual Address space)
+- FEAT_MEC (Memory Encryption Contexts)
+
+ * This is a register-only implementation without encryption.
- FEAT_MixedEnd (Mixed-endian support)
- FEAT_MixedEndEL0 (Mixed-endian support at EL0)
- FEAT_MOPS (Standardization of memory operations)
diff --git a/target/arm/tcg/cpu64.c b/target/arm/tcg/cpu64.c
index abef6a246e..3661f3ec83 100644
--- a/target/arm/tcg/cpu64.c
+++ b/target/arm/tcg/cpu64.c
@@ -1252,6 +1252,7 @@ void aarch64_max_tcg_initfn(Object *obj)
t = GET_IDREG(isar, ID_AA64MMFR3);
t = FIELD_DP64(t, ID_AA64MMFR3, TCRX, 1); /* FEAT_TCR2 */
t = FIELD_DP64(t, ID_AA64MMFR3, SCTLRX, 1); /* FEAT_SCTLR2 */
+ t = FIELD_DP64(t, ID_AA64MMFR3, MEC, 1); /* FEAT_MEC */
t = FIELD_DP64(t, ID_AA64MMFR3, SPEC_FPACC, 1); /* FEAT_FPACC_SPEC */
SET_IDREG(isar, ID_AA64MMFR3, t);
--
2.34.1