From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e06smtp13.uk.ibm.com (e06smtp13.uk.ibm.com [195.75.94.109]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4B0BB1A0B86 for ; Thu, 16 Apr 2015 00:17:08 +1000 (AEST) Received: from /spool/local by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 15 Apr 2015 15:17:05 +0100 Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id EF85817D805A for ; Wed, 15 Apr 2015 15:17:37 +0100 (BST) Received: from d06av11.portsmouth.uk.ibm.com (d06av11.portsmouth.uk.ibm.com [9.149.37.252]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t3FEH1iv59179128 for ; Wed, 15 Apr 2015 14:17:01 GMT Received: from d06av11.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av11.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t3FEH0Po017945 for ; Wed, 15 Apr 2015 08:17:01 -0600 From: Laurent Dufour To: Andrew Morton , "Kirill A. Shutemov" , Hugh Dickins , Rik van Riel , Mel Gorman , Pavel Emelyanov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Ingo Molnar , linuxppc-dev@lists.ozlabs.org Subject: [PATCH v5 0/3] Tracking user space vDSO remaping Date: Wed, 15 Apr 2015 16:16:55 +0200 Message-Id: In-Reply-To: <20150414123853.a3e61b7fa95b6c634e0fcce0@linux-foundation.org> References: <20150414123853.a3e61b7fa95b6c634e0fcce0@linux-foundation.org> Cc: criu@openvz.org, cov@codeaurora.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , CRIU is recreating the process memory layout by remapping the checkpointee memory area on top of the current process (criu). This includes remapping the vDSO to the place it has at checkpoint time. However some architectures like powerpc are keeping a reference to the vDSO base address to build the signal return stack frame by calling the vDSO sigreturn service. So once the vDSO has been moved, this reference is no more valid and the signal frame built later are not usable. This patch serie is introducing a new mm hook framework, and a new arch_remap hook which is called when mremap is done and the mm lock still hold. The next patch is adding the vDSO remap and unmap tracking to the powerpc architecture. Changes in v5: - Jumping over v4 which was too complex (PowerPC part) for the need. - Introducing new mm hook framework as suggested by Andrew Morton. Changes in v4: - Reviewing the PowerPC part of the patch to handle partial unmap and remap of the vDSO. Changes in v3: - Fixed grammatical error in a comment of the second patch. Thanks again, Ingo. Changes in v2: -------------- - Following the Ingo Molnar's advice, enabling the call to arch_remap through the __HAVE_ARCH_REMAP macro. This reduces considerably the first patch. Laurent Dufour (3): mm: New mm hook framework mm: New arch_remap hook powerpc/mm: Tracking vDSO remap arch/alpha/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/arc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/arm/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/arm64/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/avr32/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/blackfin/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/c6x/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/cris/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/frv/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/hexagon/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/ia64/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/m32r/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/m68k/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/metag/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/microblaze/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/mips/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/mn10300/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/nios2/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/openrisc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/parisc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/powerpc/include/asm/mm-arch-hooks.h | 28 ++++++++++++++++++++++++++++ arch/powerpc/include/asm/mmu_context.h | 23 ++++++++++++++++++++++- arch/s390/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/score/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/sh/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/sparc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/tile/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/um/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/unicore32/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/x86/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ arch/xtensa/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ include/linux/mm-arch-hooks.h | 25 +++++++++++++++++++++++++ mm/mremap.c | 17 +++++++++++------ 33 files changed, 521 insertions(+), 7 deletions(-) create mode 100644 arch/alpha/include/asm/mm-arch-hooks.h create mode 100644 arch/arc/include/asm/mm-arch-hooks.h create mode 100644 arch/arm/include/asm/mm-arch-hooks.h create mode 100644 arch/arm64/include/asm/mm-arch-hooks.h create mode 100644 arch/avr32/include/asm/mm-arch-hooks.h create mode 100644 arch/blackfin/include/asm/mm-arch-hooks.h create mode 100644 arch/c6x/include/asm/mm-arch-hooks.h create mode 100644 arch/cris/include/asm/mm-arch-hooks.h create mode 100644 arch/frv/include/asm/mm-arch-hooks.h create mode 100644 arch/hexagon/include/asm/mm-arch-hooks.h create mode 100644 arch/ia64/include/asm/mm-arch-hooks.h create mode 100644 arch/m32r/include/asm/mm-arch-hooks.h create mode 100644 arch/m68k/include/asm/mm-arch-hooks.h create mode 100644 arch/metag/include/asm/mm-arch-hooks.h create mode 100644 arch/microblaze/include/asm/mm-arch-hooks.h create mode 100644 arch/mips/include/asm/mm-arch-hooks.h create mode 100644 arch/mn10300/include/asm/mm-arch-hooks.h create mode 100644 arch/nios2/include/asm/mm-arch-hooks.h create mode 100644 arch/openrisc/include/asm/mm-arch-hooks.h create mode 100644 arch/parisc/include/asm/mm-arch-hooks.h create mode 100644 arch/powerpc/include/asm/mm-arch-hooks.h create mode 100644 arch/s390/include/asm/mm-arch-hooks.h create mode 100644 arch/score/include/asm/mm-arch-hooks.h create mode 100644 arch/sh/include/asm/mm-arch-hooks.h create mode 100644 arch/sparc/include/asm/mm-arch-hooks.h create mode 100644 arch/tile/include/asm/mm-arch-hooks.h create mode 100644 arch/um/include/asm/mm-arch-hooks.h create mode 100644 arch/unicore32/include/asm/mm-arch-hooks.h create mode 100644 arch/x86/include/asm/mm-arch-hooks.h create mode 100644 arch/xtensa/include/asm/mm-arch-hooks.h create mode 100644 include/linux/mm-arch-hooks.h -- 1.9.1