[PATCH 2/3] arm64: Add missing ISB after invalidating TLB in __primary_switch
STALE2048d
LANDED
From: Marc Zyngier <maz@kernel.org>
Date: 2021-02-24 09:39:42
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Landed in mainline as 9d41053e8dc1 on 2021-02-24.
Although there has been a bit of back and forth on the subject,
it appears that invalidating TLBs requires an ISB instruction
after the TLBI/DSB sequence, as documented in d0b7a302d58a
("Revert "arm64: Remove unnecessary ISBs from set_{pte,pmd,pud}"").
Add the missing ISB in __primary_switch, just in case.
Fixes: 3c5e9f238bc4 ("arm64: head.S: move KASLR processing out of __enable_mmu()")
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kernel/head.S | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 1e30b5550d2a..66b0e0b66e31 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S@@ -837,6 +837,7 @@ SYM_FUNC_START_LOCAL(__primary_switch) tlbi vmalle1 // Remove any stale TLB entries dsb nsh + isb set_sctlr_el1 x19 // re-enable the MMU
--
2.29.2
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