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x86/speculation/mmio: Enable CPU Fill buffer clearing on idle
commit 99a83db upstream When the CPU is affected by Processor MMIO Stale Data vulnerabilities, Fill Buffer Stale Data Propagator (FBSDP) can propagate stale data out of Fill buffer to uncore buffer when CPU goes idle. Stale data can then be exploited with other variants using MMIO operations. Mitigate it by clearing the Fill buffer before entering idle state. Signed-off-by: Pawan Gupta <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Co-developed-by: Josh Poimboeuf <[email protected]> Signed-off-by: Josh Poimboeuf <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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