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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 16 Apr 2019 14:45:51 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3GDjneJ48103450 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 16 Apr 2019 13:45:49 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5AF6A4C05A; Tue, 16 Apr 2019 13:45:49 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DE2934C059; Tue, 16 Apr 2019 13:45:47 +0000 (GMT) Received: from nimbus.lab.toulouse-stg.fr.ibm.com (unknown [9.101.4.33]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 16 Apr 2019 13:45:47 +0000 (GMT) From: Laurent Dufour To: akpm@linux-foundation.org, mhocko@kernel.org, peterz@infradead.org, kirill@shutemov.name, ak@linux.intel.com, dave@stgolabs.net, jack@suse.cz, Matthew Wilcox , aneesh.kumar@linux.ibm.com, benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, Thomas Gleixner , Ingo Molnar , hpa@zytor.com, Will Deacon , Sergey Senozhatsky , sergey.senozhatsky.work@gmail.com, Andrea Arcangeli , Alexei Starovoitov , kemi.wang@intel.com, Daniel Jordan , David Rientjes , Jerome Glisse , Ganesh Mahendran , Minchan Kim , Punit Agrawal , vinayak menon , Yang Shi , zhong jiang , Haiyan Song , Balbir Singh , sj38.park@gmail.com, Michel Lespinasse , Mike Rapoport Subject: [PATCH v12 09/31] mm: VMA sequence count Date: Tue, 16 Apr 2019 15:45:00 +0200 X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190416134522.17540-1-ldufour@linux.ibm.com> References: <20190416134522.17540-1-ldufour@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19041613-0012-0000-0000-0000030F6EFB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19041613-0013-0000-0000-00002147A858 Message-Id: <20190416134522.17540-10-ldufour@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-16_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904160093 X-Mailman-Approved-At: Wed, 17 Apr 2019 06:55:23 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, npiggin@gmail.com, linux-mm@kvack.org, paulmck@linux.vnet.ibm.com, Tim Chen , haren@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Peter Zijlstra Wrap the VMA modifications (vma_adjust/unmap_page_range) with sequence counts such that we can easily test if a VMA is changed. The calls to vm_write_begin/end() in unmap_page_range() are used to detect when a VMA is being unmap and thus that new page fault should not be satisfied for this VMA. If the seqcount hasn't changed when the page table are locked, this means we are safe to satisfy the page fault. The flip side is that we cannot distinguish between a vma_adjust() and the unmap_page_range() -- where with the former we could have re-checked the vma bounds against the address. The VMA's sequence counter is also used to detect change to various VMA's fields used during the page fault handling, such as: - vm_start, vm_end - vm_pgoff - vm_flags, vm_page_prot - anon_vma - vm_policy Signed-off-by: Peter Zijlstra (Intel) [Port to 4.12 kernel] [Build depends on CONFIG_SPECULATIVE_PAGE_FAULT] [Introduce vm_write_* inline function depending on CONFIG_SPECULATIVE_PAGE_FAULT] [Fix lock dependency between mapping->i_mmap_rwsem and vma->vm_sequence by using vm_raw_write* functions] [Fix a lock dependency warning in mmap_region() when entering the error path] [move sequence initialisation INIT_VMA()] [Review the patch description about unmap_page_range()] Signed-off-by: Laurent Dufour --- include/linux/mm.h | 44 ++++++++++++++++++++++++++++++++++++++++ include/linux/mm_types.h | 3 +++ mm/memory.c | 2 ++ mm/mmap.c | 30 +++++++++++++++++++++++++++ 4 files changed, 79 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 2ceb1d2869a6..906b9e06f18e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1410,6 +1410,9 @@ struct zap_details { static inline void INIT_VMA(struct vm_area_struct *vma) { INIT_LIST_HEAD(&vma->anon_vma_chain); +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT + seqcount_init(&vma->vm_sequence); +#endif } struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, @@ -1534,6 +1537,47 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, unmap_mapping_range(mapping, holebegin, holelen, 0); } +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT +static inline void vm_write_begin(struct vm_area_struct *vma) +{ + write_seqcount_begin(&vma->vm_sequence); +} +static inline void vm_write_begin_nested(struct vm_area_struct *vma, + int subclass) +{ + write_seqcount_begin_nested(&vma->vm_sequence, subclass); +} +static inline void vm_write_end(struct vm_area_struct *vma) +{ + write_seqcount_end(&vma->vm_sequence); +} +static inline void vm_raw_write_begin(struct vm_area_struct *vma) +{ + raw_write_seqcount_begin(&vma->vm_sequence); +} +static inline void vm_raw_write_end(struct vm_area_struct *vma) +{ + raw_write_seqcount_end(&vma->vm_sequence); +} +#else +static inline void vm_write_begin(struct vm_area_struct *vma) +{ +} +static inline void vm_write_begin_nested(struct vm_area_struct *vma, + int subclass) +{ +} +static inline void vm_write_end(struct vm_area_struct *vma) +{ +} +static inline void vm_raw_write_begin(struct vm_area_struct *vma) +{ +} +static inline void vm_raw_write_end(struct vm_area_struct *vma) +{ +} +#endif /* CONFIG_SPECULATIVE_PAGE_FAULT */ + extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, unsigned int gup_flags); extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index fd7d38ee2e33..e78f72eb2576 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -337,6 +337,9 @@ struct vm_area_struct { struct mempolicy *vm_policy; /* NUMA policy for the VMA */ #endif struct vm_userfaultfd_ctx vm_userfaultfd_ctx; +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT + seqcount_t vm_sequence; +#endif } __randomize_layout; struct core_thread { diff --git a/mm/memory.c b/mm/memory.c index d5bebca47d98..423fa8ea0569 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1256,6 +1256,7 @@ void unmap_page_range(struct mmu_gather *tlb, unsigned long next; BUG_ON(addr >= end); + vm_write_begin(vma); tlb_start_vma(tlb, vma); pgd = pgd_offset(vma->vm_mm, addr); do { @@ -1265,6 +1266,7 @@ void unmap_page_range(struct mmu_gather *tlb, next = zap_p4d_range(tlb, vma, pgd, addr, next, details); } while (pgd++, addr = next, addr != end); tlb_end_vma(tlb, vma); + vm_write_end(vma); } diff --git a/mm/mmap.c b/mm/mmap.c index 5ad3a3228d76..a4e4d52a5148 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -726,6 +726,30 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, long adjust_next = 0; int remove_next = 0; + /* + * Why using vm_raw_write*() functions here to avoid lockdep's warning ? + * + * Locked is complaining about a theoretical lock dependency, involving + * 3 locks: + * mapping->i_mmap_rwsem --> vma->vm_sequence --> fs_reclaim + * + * Here are the major path leading to this dependency : + * 1. __vma_adjust() mmap_sem -> vm_sequence -> i_mmap_rwsem + * 2. move_vmap() mmap_sem -> vm_sequence -> fs_reclaim + * 3. __alloc_pages_nodemask() fs_reclaim -> i_mmap_rwsem + * 4. unmap_mapping_range() i_mmap_rwsem -> vm_sequence + * + * So there is no way to solve this easily, especially because in + * unmap_mapping_range() the i_mmap_rwsem is grab while the impacted + * VMAs are not yet known. + * However, the way the vm_seq is used is guarantying that we will + * never block on it since we just check for its value and never wait + * for it to move, see vma_has_changed() and handle_speculative_fault(). + */ + vm_raw_write_begin(vma); + if (next) + vm_raw_write_begin(next); + if (next && !insert) { struct vm_area_struct *exporter = NULL, *importer = NULL; @@ -950,6 +974,8 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, * "vma->vm_next" gap must be updated. */ next = vma->vm_next; + if (next) + vm_raw_write_begin(next); } else { /* * For the scope of the comment "next" and @@ -996,6 +1022,10 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, if (insert && file) uprobe_mmap(insert); + if (next && next != vma) + vm_raw_write_end(next); + vm_raw_write_end(vma); + validate_mm(mm); return 0; -- 2.21.0