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ARM: rmobile: gen2: Enable ACTLR[0] (Enable invalidates of BTB) to facilitate CVE_2017-5715 WA in OS

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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>
This commit is contained in:
Marek Vasut 2018-06-30 08:07:41 +02:00 committed by Marek Vasut
parent 323a73adc9
commit a6759e3dfc
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mach-rmobile/Kconfig.32
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@ -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"