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UPSTREAM: ARM: Spectre-BHB workaround

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commit b9baf5c8c5c356757f4f9d8180b5e9d234065bc3 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.

Bug: 215557547
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic8fcc01c10a8d8ad1293e6d5d8a5f2da592234c7
This commit is contained in:
Russell King (Oracle)
2022-02-10 16:05:45 +00:00
committed by Greg Kroah-Hartman
parent 5a41f364e7
commit afbbe4048f
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