| From foo@baz Fri Mar 29 15:53:50 CET 2019 |
| From: Michael Ellerman <mpe@ellerman.id.au> |
| Date: Fri, 29 Mar 2019 22:26:04 +1100 |
| Subject: powerpc/64s: Add new security feature flags for count cache flush |
| To: stable@vger.kernel.org, gregkh@linuxfoundation.org |
| Cc: linuxppc-dev@ozlabs.org, diana.craciun@nxp.com, msuchanek@suse.de, christophe.leroy@c-s.fr |
| Message-ID: <20190329112620.14489-17-mpe@ellerman.id.au> |
| |
| From: Michael Ellerman <mpe@ellerman.id.au> |
| |
| commit dc8c6cce9a26a51fc19961accb978217a3ba8c75 upstream. |
| |
| 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> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| arch/powerpc/include/asm/security_features.h | 6 ++++++ |
| 1 file changed, 6 insertions(+) |
| |
| --- a/arch/powerpc/include/asm/security_features.h |
| +++ b/arch/powerpc/include/asm/security_features.h |
| @@ -59,6 +59,9 @@ static inline bool security_ftr_enabled( |
| // 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( |
| // 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 \ |
