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 <[email protected]>.
thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 0196c642f76c469c17ca09d7f904bccc123bac09 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky <[email protected]> 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: [email protected] # 3.10+ Signed-off-by: Martin Schwidefsky <[email protected]> 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); -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
