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docs/system/arm: Document FEAT_RME

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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20230622143046.1578160-1-richard.henderson@linaro.org
[PMM: fixed typo; note experimental status in emulation.rst too]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Richard Henderson 2023-06-22 16:30:46 +02:00 committed by Peter Maydell
parent a834d5474e
commit 57223a4c24
2 changed files with 24 additions and 0 deletions
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23
docs/system/arm/cpu-features.rst
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@ -435,3 +435,26 @@ As with ``sve-default-vector-length``, if the default length is larger
than the maximum vector length enabled, the actual vector length will
be reduced. If this property is set to ``-1`` then the default vector
length is set to the maximum possible length.
RME CPU Properties
==================
The status of RME support with QEMU is experimental. At this time we
only support RME within the CPU proper, not within the SMMU or GIC.
The feature is enabled by the CPU property ``x-rme``, with the ``x-``
prefix present as a reminder of the experimental status, and defaults off.
The method for enabling RME will change in some future QEMU release
without notice or backward compatibility.
RME Level 0 GPT Size Property
-----------------------------
To aid firmware developers in testing different possible CPU
configurations, ``x-l0gptsz=S`` may be used to specify the value
to encode into ``GPCCR_EL3.L0GPTSZ``, a read-only field that
specifies the size of the Level 0 Granule Protection Table.
Legal values for ``S`` are 30, 34, 36, and 39; the default is 30.
As with ``x-rme``, the ``x-l0gptsz`` property may be renamed or
removed in some future QEMU release.

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docs/system/arm/emulation.rst
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@ -66,6 +66,7 @@ the following architecture extensions:
- FEAT_RAS (Reliability, availability, and serviceability)
- FEAT_RASv1p1 (RAS Extension v1.1)
- FEAT_RDM (Advanced SIMD rounding double multiply accumulate instructions)
- FEAT_RME (Realm Management Extension) (NB: support status in QEMU is experimental)
- FEAT_RNG (Random number generator)
- FEAT_S2FWB (Stage 2 forced Write-Back)
- FEAT_SB (Speculation Barrier)