The patch below does not apply to the 3.11-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 0196c642f76c469c17ca09d7f904bccc123bac09 Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Date: Tue, 27 Aug 2013 08:19:27 +0200
Subject: [PATCH] s390/pgtable: fix mprotect for single-threaded KVM guests
For a single-threaded KVM guest ptep_modify_prot_start will not use
IPTE, the invalid bit will therefore not be set. If DEBUG_VM is set
pgste_set_key called by ptep_modify_prot_commit will complain about
the missing invalid bit. ptep_modify_prot_start should set the
invalid bit in all cases.
Cc: stable@xxxxxxxxxxxxxxx # 3.10+
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 125e3790..1d144b6f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1093,6 +1093,7 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
pte = *ptep;
ptep_flush_lazy(mm, address, ptep);
+ pte_val(*ptep) |= _PAGE_INVALID;
if (mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
--
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