[PATCH 1/2] powerpc/64s: Fix entry flush patching w/strict RWX & hash

Michael Ellerman patch-notifications at ellerman.id.au
Sun May 16 08:43:55 AEST 2021

On Fri, 14 May 2021 00:07:59 +1000, Michael Ellerman wrote:
> The entry flush mitigation can be enabled/disabled at runtime. When this
> happens it results in the kernel patching its own instructions to
> enable/disable the mitigation sequence.
> With strict kernel RWX enabled instruction patching happens via a
> secondary mapping of the kernel text, so that we don't have to make the
> primary mapping writable. With the hash MMU this leads to a hash fault,
> which causes us to execute the exception entry which contains the entry
> flush mitigation.
> [...]

Applied to powerpc/fixes.

[1/2] powerpc/64s: Fix entry flush patching w/strict RWX & hash
[2/2] powerpc/64s: Fix stf mitigation patching w/strict RWX & hash


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