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powerpc/security: Add a helper to query stf_barrier type
Add a helper to return the stf_barrier type for the current processor. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/3bd5d7f96ea1547991ac2ce3137dc2b220bae285.1633464148.git.naveen.n.rao@linux.vnet.ibm.com
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2 changed files with 10 additions and 0 deletions
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@ -39,6 +39,11 @@ static inline bool security_ftr_enabled(u64 feature)
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return !!(powerpc_security_features & feature);
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}
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#ifdef CONFIG_PPC_BOOK3S_64
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enum stf_barrier_type stf_barrier_type_get(void);
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#else
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static inline enum stf_barrier_type stf_barrier_type_get(void) { return STF_BARRIER_NONE; }
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#endif
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// Features indicating support for Spectre/Meltdown mitigations
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@ -263,6 +263,11 @@ static int __init handle_no_stf_barrier(char *p)
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early_param("no_stf_barrier", handle_no_stf_barrier);
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enum stf_barrier_type stf_barrier_type_get(void)
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{
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return stf_enabled_flush_types;
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}
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/* This is the generic flag used by other architectures */
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static int __init handle_ssbd(char *p)
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{
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