ARM: mach-omap2: omap3/am335x: Enable ACR::IBE on Cortex-A8 SoCs for CVE-2017-5715

Enable CVE-2017-5715 option to set the IBE bit. This enables kernel
workarounds necessary for the said CVE.

With this enabled, Linux reports:
CPU0: Spectre v2: using BPIALL workaround

This workaround may need to be re-applied in OS environment around low
power transition resume states where context of ACR would be lost (off-mode
etc).

Signed-off-by: Nishanth Menon <nm@ti.com>

diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 77820cc8d1e48971dcc014bc7542a3dd3cf88528..f4babc8d260014a24cf5367e38f24d509e349c11 100644 (file)
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -10,6 +10,7 @@ config OMAP34XX
        select ARM_ERRATA_454179
        select ARM_ERRATA_621766
        select ARM_ERRATA_725233
+       select ARM_CORTEX_A8_CVE_2017_5715
        select USE_TINY_PRINTF
        imply NAND_OMAP_GPMC
        imply SPL_EXT_SUPPORT
@@ -116,6 +117,7 @@ config AM43XX
 config AM33XX
        bool "AM33XX SoC"
        select SPECIFY_CONSOLE_INDEX
+       select ARM_CORTEX_A8_CVE_2017_5715
        imply NAND_OMAP_ELM
        imply NAND_OMAP_GPMC
        imply SPL_NAND_AM33XX_BCH