Enable CVE_2017_5715 mitigation on CPU0 on R-Car H2, M2W, M2N, V2H, which all contain Cortex-A15 cores. R-Car E2 contains only Cortex-A7 cores and is not affected. Without this enabled, Linux kernel reports:

CPU0: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable

With this enabled, Linux kernel reports:

CPU0: Spectre v2: using ICIALLU workaround

NOTE: This by itself does not enable the workaround for other CPUs than CPU0 and may require additional kernel patches for the other CPUs in SMP configurations.

Signed-off-by: Marek Vasut marek.vasut+renesas@gmail.com Cc: Nishanth Menon nm@ti.com Cc: Nobuhiro Iwamatsu iwamatsu@nigauri.org --- arch/arm/mach-rmobile/Kconfig.32 | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/arch/arm/mach-rmobile/Kconfig.32 b/arch/arm/mach-rmobile/Kconfig.32 index c0b5b2457c..6c492ff409 100644 --- a/arch/arm/mach-rmobile/Kconfig.32 +++ b/arch/arm/mach-rmobile/Kconfig.32 @@ -13,18 +13,22 @@ config R8A7740 config R8A7790 bool "Renesas SoC R8A7790" select RCAR_GEN2 + select ARM_CORTEX_A15_CVE_2017_5715

config R8A7791 bool "Renesas SoC R8A7791" select RCAR_GEN2 + select ARM_CORTEX_A15_CVE_2017_5715

config R8A7792 bool "Renesas SoC R8A7792" select RCAR_GEN2 + select ARM_CORTEX_A15_CVE_2017_5715

config R8A7793 bool "Renesas SoC R8A7793" select RCAR_GEN2 + select ARM_CORTEX_A15_CVE_2017_5715

config R8A7794 bool "Renesas SoC R8A7794"