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target/arm: Enable FEAT_CSV2_3 for -cpu max

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FEAT_CSV2_3 adds a mechanism to identify if hardware cannot disclose
information about whether branch targets and branch history trained
in one hardware described context can control speculative execution
in a different hardware context.

There is no branch prediction in TCG, so we don't need to do anything
to be compliant with this.  Upadte the '-cpu max' ID registers to
advertise the feature.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240418152004.2106516-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-04-18 16:20:01 +01:00
parent bc980d6630
commit e197395180
2 changed files with 3 additions and 2 deletions
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1
docs/system/arm/emulation.rst
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@ -32,6 +32,7 @@ the following architecture extensions:
- FEAT_CSV2_1p1 (Cache speculation variant 2, version 1.1)
- FEAT_CSV2_1p2 (Cache speculation variant 2, version 1.2)
- FEAT_CSV2_2 (Cache speculation variant 2, version 2)
- FEAT_CSV2_3 (Cache speculation variant 2, version 3)
- FEAT_CSV3 (Cache speculation variant 3)
- FEAT_DGH (Data gathering hint)
- FEAT_DIT (Data Independent Timing instructions)