x86/smp: Dont access non-existing CPUID leaf
stop_this_cpu() tests CPUID leaf 0x8000001f::EAX unconditionally. Intel CPUs return the content of the highest supported leaf when a non-existing leaf is read, while AMD CPUs return all zeros for unsupported leafs. So the result of the test on Intel CPUs is lottery. While harmless it's incorrect and causes the conditional wbinvd() to be issued where not required. Check whether the leaf is supported before reading it. [ tglx: Adjusted changelog ] Fixes: 08f253ec ("x86/cpu: Clear SME feature flag when not in use") Signed-off-by:Tony Battersby <tonyb@cybernetics.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Reviewed-by:
Mario Limonciello <mario.limonciello@amd.com> Reviewed-by:
Borislav Petkov (AMD) <bp@alien8.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/3817d810-e0f1-8ef8-0bbd-663b919ca49b@cybernetics.com Link: https://lore.kernel.org/r/20230615193330.322186388@linutronix.de
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