This is a note to let you know that I've just added the patch titled
arm64: kvm: use inner-shareable barriers for inner-shareable maintenance
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-kvm-use-inner-shareable-barriers-for-inner-shareable-maintenance.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ee9e101c11478680d579bd20bb38a4d3e2514fe3 Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@xxxxxxx>
Date: Fri, 2 May 2014 16:24:14 +0100
Subject: arm64: kvm: use inner-shareable barriers for inner-shareable maintenance
From: Will Deacon <will.deacon@xxxxxxx>
commit ee9e101c11478680d579bd20bb38a4d3e2514fe3 upstream.
In order to ensure completion of inner-shareable maintenance instructions
(cache and TLB) on AArch64, we can use the -ish suffix to the dsb
instruction.
This patch relaxes our dsb sy instructions to dsb ish where possible.
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kvm/hyp.S | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -630,9 +630,15 @@ ENTRY(__kvm_tlb_flush_vmid_ipa)
* whole of Stage-1. Weep...
*/
tlbi ipas2e1is, x1
- dsb sy
+ /*
+ * We have to ensure completion of the invalidation at Stage-2,
+ * since a table walk on another CPU could refill a TLB with a
+ * complete (S1 + S2) walk based on the old Stage-2 mapping if
+ * the Stage-1 invalidation happened first.
+ */
+ dsb ish
tlbi vmalle1is
- dsb sy
+ dsb ish
isb
msr vttbr_el2, xzr
@@ -643,7 +649,7 @@ ENTRY(__kvm_flush_vm_context)
dsb ishst
tlbi alle1is
ic ialluis
- dsb sy
+ dsb ish
ret
ENDPROC(__kvm_flush_vm_context)
Patches currently in stable-queue which might be from will.deacon@xxxxxxx are
queue-3.14/kvm-arm64-vgic-fix-hyp-panic-with-64k-pages-on-juno-platform.patch
queue-3.14/arm64-kvm-use-inner-shareable-barriers-for-inner-shareable-maintenance.patch
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