4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Rutland <mark.rutl...@arm.com>
From: Catalin Marinas <catalin.mari...@arm.com>
commit f33bcf03e6079668da6bf4eec4a7dcf9289131d0 upstream.
This patch takes the errata workaround code out of cpu_do_switch_mm into
a dedicated post_ttbr0_update_workaround macro which will be reused in a
subsequent patch.
Cc: Will Deacon <will.dea...@arm.com>
Cc: James Morse <james.mo...@arm.com>
Cc: Kees Cook <keesc...@chromium.org>
Reviewed-by: Mark Rutland <mark.rutl...@arm.com>
Signed-off-by: Catalin Marinas <catalin.mari...@arm.com>
Signed-off-by: Mark Rutland <mark.rutl...@arm.com> [v4.9 backport]
Tested-by: Greg Hackmann <ghackm...@google.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arm64/include/asm/assembler.h | 14 ++++++++++++++
arch/arm64/mm/proc.S | 6 +-----
2 files changed, 15 insertions(+), 5 deletions(-)
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -434,4 +434,18 @@ alternative_endif
.macro pte_to_phys, phys, pte
and \phys, \pte, #(((1 << (48 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
.endm
+
+/*
+ * Errata workaround post TTBR0_EL1 update.
+ */
+ .macro post_ttbr0_update_workaround
+#ifdef CONFIG_CAVIUM_ERRATUM_27456
+alternative_if ARM64_WORKAROUND_CAVIUM_27456
+ ic iallu
+ dsb nsh
+ isb
+alternative_else_nop_endif
+#endif
+ .endm
+
#endif /* __ASM_ASSEMBLER_H */
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -139,11 +139,7 @@ ENTRY(cpu_do_switch_mm)
isb
msr ttbr0_el1, x0 // now update TTBR0
isb
-alternative_if ARM64_WORKAROUND_CAVIUM_27456
- ic iallu
- dsb nsh
- isb
-alternative_else_nop_endif
+ post_ttbr0_update_workaround
ret
ENDPROC(cpu_do_switch_mm)
