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arm64: Rewrite Spectre-v2 mitigation code

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The Spectre-v2 mitigation code is pretty unwieldy and hard to maintain.
This is largely due to it being written hastily, without much clue as to
how things would pan out, and also because it ends up mixing policy and
state in such a way that it is very difficult to figure out what's going
on.

Rewrite the Spectre-v2 mitigation so that it clearly separates state from
policy and follows a more structured approach to handling the mitigation.

Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2020-09-15 23:30:17 +01:00
commit d4647f0a2a
8 changed files with 327 additions and 264 deletions
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