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target/arm: Add cpu properties for SME

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Mirror the properties for SVE.  The main difference is
that any arbitrary set of powers of 2 may be supported,
and not the stricter constraints that apply to SVE.

Include a property to control FEAT_SME_FA64, as failing
to restrict the runtime to the proper subset of insns
could be a major point for bugs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220620175235.60881-18-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-06-20 10:52:01 -07:00 • committed by Peter Maydell
parent 70cc9ee19e
commit e74c097638
5 changed files with 180 additions and 7 deletions
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56
docs/system/arm/cpu-features.rst
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@ -372,6 +372,31 @@ verbose command lines. However, the recommended way to select vector
lengths is to explicitly enable each desired length. Therefore only
example's (1), (4), and (6) exhibit recommended uses of the properties.
SME CPU Property Examples
-------------------------
1) Disable SME::
$ qemu-system-aarch64 -M virt -cpu max,sme=off
2) Implicitly enable all vector lengths for the ``max`` CPU type::
$ qemu-system-aarch64 -M virt -cpu max
3) Only enable the 256-bit vector length::
$ qemu-system-aarch64 -M virt -cpu max,sme256=on
3) Enable the 256-bit and 1024-bit vector lengths::
$ qemu-system-aarch64 -M virt -cpu max,sme256=on,sme1024=on
4) Disable the 512-bit vector length. This results in all the other
lengths supported by ``max`` defaulting to enabled
(128, 256, 1024 and 2048)::
$ qemu-system-aarch64 -M virt -cpu max,sve512=off
SVE User-mode Default Vector Length Property
--------------------------------------------
@ -387,3 +412,34 @@ length supported by QEMU is 256.
If this property is set to ``-1`` then the default vector length
is set to the maximum possible length.
SME CPU Properties
==================
The SME CPU properties are much like the SVE properties: ``sme`` is
used to enable or disable the entire SME feature, and ``sme<N>`` is
used to enable or disable specific vector lengths. Finally,
``sme_fa64`` is used to enable or disable ``FEAT_SME_FA64``, which
allows execution of the "full a64" instruction set while Streaming
SVE mode is enabled.
SME is not supported by KVM at this time.
At least one vector length must be enabled when ``sme`` is enabled,
and all vector lengths must be powers of 2. The maximum vector
length supported by qemu is 2048 bits. Otherwise, there are no
additional constraints on the set of vector lengths supported by SME.
SME User-mode Default Vector Length Property
--------------------------------------------
For qemu-aarch64, the cpu propery ``sme-default-vector-length=N`` is
defined to mirror the Linux kernel parameter file
``/proc/sys/abi/sme_default_vector_length``. The default length, ``N``,
is in units of bytes and must be between 16 and 8192.
If not specified, the default vector length is 32.
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.