From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83773C43613 for ; Mon, 24 Jun 2019 14:33:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5C6EF208E4 for ; Mon, 24 Jun 2019 14:33:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BuaO5811" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729712AbfFXOdp (ORCPT ); Mon, 24 Jun 2019 10:33:45 -0400 Received: from mail-vk1-f202.google.com ([209.85.221.202]:55563 "EHLO mail-vk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729562AbfFXOdm (ORCPT ); Mon, 24 Jun 2019 10:33:42 -0400 Received: by mail-vk1-f202.google.com with SMTP id b85so6431502vke.22 for ; Mon, 24 Jun 2019 07:33:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=+QjTccShtmk/DNvEu2Adujr4/24uQqkMA4u/Npu2BdA=; b=BuaO5811jnUX9zfd4G8ToBhrbhMJy0LzFmcX+sgB7AQM8NJvSv01OIt+sAqC0IYDFj O+VE+bcKl7xzCDnEKiecjcqkjUhFXSFgcq02fOM7s9XnYH4kbv5oATeSWl+tEWpHxjax uddXNBc9L6bsecbckcats1vGIj+FRm1AXB1jETFkmq7osCy5XjHt0r7A/MylVaoS7sEi BEqqQGEpCtD+G1DLTSJRrPX1jP7q6JLRto0o7pT68gHSfXhTroGbTpoKZNwyLPn4gBNV 8ODVys95W2+g/mSu4Rja/qhLF+ras1jurnSxRwwt4QC/Gcz8iYCVwlkq+O0Dgaz38Z6X Qigg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=+QjTccShtmk/DNvEu2Adujr4/24uQqkMA4u/Npu2BdA=; b=TWochnekJoaPffLWhq2brGHx3IQDSTVZdctts4bptAo1O3Zq/r0tqK/ZmDnwhcmk+C pS0B6e79YeFv5rWBDDkejVKehtArAsBvM5deyizK7p8qi8ra0FKuJG5s0rTKf8SAnCUy Ub+YzFE3WVEzbTE7QPmIwA+QAuue7+vXLFNBLD+2mKpZ/G2zF/bmm4WQFdU9kwkp+Oyg DRl3b1T6eWXd8mljByXlMlYZfrdKiLdwt+Pycuk23D0sdPYJ9h2jWN1B9KiOyr7iWB0R K5QZ3LmGeOgzO/pTnn7Xvuz/A+WNnm+yZUgRP2hF62G5igLUgl9vFUz6mR7jaxieusHe jlTQ== X-Gm-Message-State: APjAAAX+JUnBmPNY2MeI27G3Mi4EJLPwxvZsD50VKK4J5rTkCY3mKMEO dDRDtksWFEJtEiV6N+jx1Cf4wGTYirn9D6RE X-Google-Smtp-Source: APXvYqyUWW8huBSfbOwzfvyZrK53WvzmxiQ9by61ETLtrVtF59paHvOBrjS1vPlQyT8G9KXO3foj9yEr/dGEqynR X-Received: by 2002:a1f:a887:: with SMTP id r129mr2036386vke.75.1561386821206; Mon, 24 Jun 2019 07:33:41 -0700 (PDT) Date: Mon, 24 Jun 2019 16:32:56 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v18 11/15] IB/mlx4: untag user pointers in mlx4_get_umem_mr From: Andrey Konovalov To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch is a part of a series that extends kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. mlx4_get_umem_mr() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Signed-off-by: Andrey Konovalov --- drivers/infiniband/hw/mlx4/mr.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c index 355205a28544..13d9f917f249 100644 --- a/drivers/infiniband/hw/mlx4/mr.c +++ b/drivers/infiniband/hw/mlx4/mr.c @@ -378,6 +378,7 @@ static struct ib_umem *mlx4_get_umem_mr(struct ib_udata *udata, u64 start, * again */ if (!ib_access_writable(access_flags)) { + unsigned long untagged_start = untagged_addr(start); struct vm_area_struct *vma; down_read(¤t->mm->mmap_sem); @@ -386,9 +387,9 @@ static struct ib_umem *mlx4_get_umem_mr(struct ib_udata *udata, u64 start, * cover the memory, but for now it requires a single vma to * entirely cover the MR to support RO mappings. */ - vma = find_vma(current->mm, start); - if (vma && vma->vm_end >= start + length && - vma->vm_start <= start) { + vma = find_vma(current->mm, untagged_start); + if (vma && vma->vm_end >= untagged_start + length && + vma->vm_start <= untagged_start) { if (vma->vm_flags & VM_WRITE) access_flags |= IB_ACCESS_LOCAL_WRITE; } else { -- 2.22.0.410.gd8fdbe21b5-goog