x86/speculation: Add Kconfig option for GDS

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commit 53cf5797f1 upstream

Gather Data Sampling (GDS) is mitigated in microcode. However, on
systems that haven't received the updated microcode, disabling AVX
can act as a mitigation. Add a Kconfig option that uses the microcode
mitigation if available and disables AVX otherwise. Setting this
option has no effect on systems not affected by GDS. This is the
equivalent of setting gather_data_sampling=force.

Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Daniel Sneddon 2023-08-01 16:36:26 +02:00 • committed by Greg Kroah-Hartman

parent 92fc27c79b

commit c04579e954

2 changed files with 23 additions and 0 deletions

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19

arch/x86/Kconfig

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4

arch/x86/kernel/cpu/bugs.c

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