From: Nishanth Menon Date: Tue, 12 Jun 2018 20:24:10 +0000 (-0500) Subject: ARM: mach-omap2: omap5/dra7: Enable ACTLR[0] (Enable invalidates of BTB) to facilitat... X-Git-Tag: v2018.07-rc3~10 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=dbb7caf110c4a7b9afb7cdc195ac6967d3a30adf;p=oweals%2Fu-boot.git ARM: mach-omap2: omap5/dra7: Enable ACTLR[0] (Enable invalidates of BTB) to facilitate CVE_2017-5715 WA in OS 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 --- diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index 3bb1ecb58d..77820cc8d1 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -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