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powerpc/64s: Add new security feature flags for count cache flush 

Add security feature flags to indicate the need for software to flush
the count cache on context switch, and for the presence of a hardware
assisted count cache flush.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2018-07-24 01:07:53 +10:00
parent 06d0bbc6d0
commit dc8c6cce9a
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/include/asm/security_features.h
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@ -59,6 +59,9 @@ static inline bool security_ftr_enabled(unsigned long feature)
// Indirect branch prediction cache disabled
#define SEC_FTR_COUNT_CACHE_DISABLED 0x0000000000000020ull
// bcctr 2,0,0 triggers a hardware assisted count cache flush
#define SEC_FTR_BCCTR_FLUSH_ASSIST 0x0000000000000800ull
// Features indicating need for Spectre/Meltdown mitigations
@ -74,6 +77,9 @@ static inline bool security_ftr_enabled(unsigned long feature)
// Firmware configuration indicates user favours security over performance
#define SEC_FTR_FAVOUR_SECURITY 0x0000000000000200ull
// Software required to flush count cache on context switch
#define SEC_FTR_FLUSH_COUNT_CACHE 0x0000000000000400ull
// Features enabled by default
#define SEC_FTR_DEFAULT \