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ARM: mach-omap2: omap5/dra7: Enable ACTLR[0] (Enable invalidates of BTB) to facilitate CVE_2017-5715 WA in OS

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Enable CVE_2017_5715 and since we have our own v7_arch_cp15_set_acr
function to setup the bits, we are able to override the settings.

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 CPU1 (on
OMAP5 and DRA72/AM572 SoCs) and may require additional kernel patches.

Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Nishanth Menon 2018-06-12 15:24:10 -05:00 committed by Tom Rini
parent c2ca3fdfb9
commit dbb7caf110
1 changed files with 1 additions and 0 deletions
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arch/arm/mach-omap2/Kconfig
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@ -53,6 +53,7 @@ config OMAP54XX
bool "OMAP54XX SoC"
select ARM_ERRATA_798870
select SYS_THUMB_BUILD
select ARM_CORTEX_A15_CVE_2017_5715
imply NAND_OMAP_ELM
imply NAND_OMAP_GPMC
imply SPL_DISPLAY_PRINT