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ARM: Spectre-BHB workaround

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commit b9baf5c8c5 upstream.

Workaround the Spectre BHB issues for Cortex-A15, Cortex-A57,
Cortex-A72, Cortex-A73 and Cortex-A75. We also include Brahma B15 as
well to be safe, which is affected by Spectre V2 in the same ways as
Cortex-A15.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
[changes due to lack of SYSTEM_FREEING_INITMEM - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell King (Oracle)
2022-02-10 16:05:45 +00:00
committed by Greg Kroah-Hartman
parent 29d9b56df1
commit 3f9c958e35
9 changed files with 254 additions and 9 deletions
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10
arch/arm/include/asm/assembler.h
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@@ -107,6 +107,16 @@
.endm
#endif
#if __LINUX_ARM_ARCH__ < 7
.macro dsb, args
mcr p15, 0, r0, c7, c10, 4
.endm
.macro isb, args
mcr p15, 0, r0, c7, r5, 4
.endm
#endif
.macro asm_trace_hardirqs_off, save=1
#if defined(CONFIG_TRACE_IRQFLAGS)
.if \save