x86/bugs: Whitelist allowed SPEC_CTRL MSR values

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commit 1115a859f3 upstream

Intel and AMD SPEC_CTRL (0x48) MSR semantics may differ in the
future (or in fact use different MSRs for the same functionality).

As such a run-time mechanism is required to whitelist the appropriate MSR
values.

[ tglx: Made the variable __ro_after_init ]

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Konrad Rzeszutek Wilk 2018-04-25 22:04:23 -04:00 • committed by Greg Kroah-Hartman

parent 128e69909f

commit fa2f1c6524

1 changed files with 9 additions and 2 deletions

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arch/x86/kernel/cpu/bugs.c

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