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/* SPDX-License-Identifier: GPL-2.0+ */ /* * Security related feature bit definitions. * * Copyright 2018, Michael Ellerman, IBM Corporation. */ #ifndef _ASM_POWERPC_SECURITY_FEATURES_H #define _ASM_POWERPC_SECURITY_FEATURES_H extern unsigned long powerpc_security_features; static inline void security_ftr_set(unsigned long feature) { powerpc_security_features |= feature; } static inline void security_ftr_clear(unsigned long feature) { powerpc_security_features &= ~feature; } static inline bool security_ftr_enabled(unsigned long feature) { return !!(powerpc_security_features & feature); } // Features indicating support for Spectre/Meltdown mitigations // The L1-D cache can be flushed with ori r30,r30,0 #define SEC_FTR_L1D_FLUSH_ORI30 0x0000000000000001ull // The L1-D cache can be flushed with mtspr 882,r0 (aka SPRN_TRIG2) #define SEC_FTR_L1D_FLUSH_TRIG2 0x0000000000000002ull // ori r31,r31,0 acts as a speculation barrier #define SEC_FTR_SPEC_BAR_ORI31 0x0000000000000004ull // Speculation past bctr is disabled #define SEC_FTR_BCCTRL_SERIALISED 0x0000000000000008ull // Entries in L1-D are private to a SMT thread #define SEC_FTR_L1D_THREAD_PRIV 0x0000000000000010ull // Indirect branch prediction cache disabled #define SEC_FTR_COUNT_CACHE_DISABLED 0x0000000000000020ull // Features indicating need for Spectre/Meltdown mitigations // The L1-D cache should be flushed on MSR[HV] 1->0 transition (hypervisor to guest) #define SEC_FTR_L1D_FLUSH_HV 0x0000000000000040ull // The L1-D cache should be flushed on MSR[PR] 0->1 transition (kernel to userspace) #define SEC_FTR_L1D_FLUSH_PR 0x0000000000000080ull // A speculation barrier should be used for bounds checks (Spectre variant 1) #define SEC_FTR_BNDS_CHK_SPEC_BAR 0x0000000000000100ull // Firmware configuration indicates user favours security over performance #define SEC_FTR_FAVOUR_SECURITY 0x0000000000000200ull // Features enabled by default #define SEC_FTR_DEFAULT \ (SEC_FTR_L1D_FLUSH_HV | \ SEC_FTR_L1D_FLUSH_PR | \ SEC_FTR_BNDS_CHK_SPEC_BAR | \ SEC_FTR_FAVOUR_SECURITY) #endif /* _ASM_POWERPC_SECURITY_FEATURES_H */