From patchwork Tue Apr 20 22:08:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12215129 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 9D097C43470 for ; Tue, 20 Apr 2021 22:10:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68622613E6 for ; Tue, 20 Apr 2021 22:10:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234321AbhDTWKw (ORCPT ); Tue, 20 Apr 2021 18:10:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40398 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234277AbhDTWIx (ORCPT ); Tue, 20 Apr 2021 18:08:53 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8EF5C061345 for ; Tue, 20 Apr 2021 15:08:20 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id z8-20020a2566480000b02904e0f6f67f42so13574997ybm.15 for ; Tue, 20 Apr 2021 15:08:20 -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=kyyFN9AtGZG7sxPS2jLvKjxCRLZ+illjJVxTiN8fbrw=; b=JMFOJKQD6VWL9XWjUHGhpO9LBqTgy+Ns6fTSXa2N2FAVemnw5VhmoB8JVGyLKXRMoP 2G0wdlLBgdOhhK5YQ4CSnnXRozuBjZZcnXpkq6Q7qi9RjHZX57x01gxijHUwYLiy5CPv eZOhPdwcNIQDcKY4LVYGz9rmDpo3AI21KJqv2M2PFmKqLgMg0CFV1rH55+7lNFzi/hNG 0aKGqwvkAagADR6EWdoAt9UMb2LAN8yei0RbDGmaJPGEn24BE7e20Y4iUGKusAy3Sk0A qVVk2k/ceUjOT+szFnzRtbQL0hxobpqxT/CVfwYY34M4ctoIWzzco4mrUAXOe1tEoLj9 SM4A== 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=kyyFN9AtGZG7sxPS2jLvKjxCRLZ+illjJVxTiN8fbrw=; b=Oc28r6cLbuaG8F6MbrF5BteTkrs/rKot+v11xe8MDTpcBvvujUwKvWAxT3ajF0HBpa SLnJY8Z+VB6vtrtyPBilCcjJhe4wFoHqhA0flJeaGYg70PJvfsIGK/wI1QrSf9u/4j7Q KWbhU95+tnyHsHWkKzCfujDhE5b/L9a9fcb697Fmu5rFg/t8kdC/QfXajfs+rNifzoyh w5iRWhokWzKMgDRFrws0/0r06l6oqnRalm77Fuja+MPhdepPDN29bWYOZ+mlCnukmK+G 6503HJzuAqnzwb6VpodeVQG1+hiDsEvDWUDNTz3RSEKKNVmFm+jSPlE5tcwNRcBqv6MY 6IKw== X-Gm-Message-State: AOAM530n0C0vXHjFUh/uFXZWStKx4ONxBdOy2nnaKZclVVctNjxQ5f7Y oBgtMRPzlyIw75ibOohUqZH03ANJZ/K/h9K/aCeH X-Google-Smtp-Source: ABdhPJzOQ0vCMNocHti08k8y48bjZn+N/2oUus8q+tA8xkgknLfFG8icRrTM906qaAXAFK5MEo2EA5AqfEAfnZrS1QUz X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:c40e:ee2c:2ab8:257a]) (user=axelrasmussen job=sendgmr) by 2002:a25:ce41:: with SMTP id x62mr26398558ybe.402.1618956499844; Tue, 20 Apr 2021 15:08:19 -0700 (PDT) Date: Tue, 20 Apr 2021 15:08:00 -0700 In-Reply-To: <20210420220804.486803-1-axelrasmussen@google.com> Message-Id: <20210420220804.486803-7-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210420220804.486803-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.368.gbe11c130af-goog Subject: [PATCH v4 06/10] userfaultfd/selftests: create alias mappings in the shmem test From: Axel Rasmussen To: Alexander Viro , Andrea Arcangeli , Andrew Morton , Hugh Dickins , Jerome Glisse , Joe Perches , Lokesh Gidra , Mike Kravetz , Mike Rapoport , Peter Xu , Shaohua Li , Shuah Khan , Stephen Rothwell , Wang Qing Cc: linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Axel Rasmussen , Brian Geffon , "Dr . David Alan Gilbert" , Mina Almasry , Oliver Upton Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Previously, we just allocated two shm areas: area_src and area_dst. With this commit, change this so we also allocate area_src_alias, and area_dst_alias. area_*_alias and area_* (respectively) point to the same underlying physical pages, but are different VMAs. In a future commit in this series, we'll leverage this setup to exercise minor fault handling support for shmem, just like we do in the hugetlb_shared test. Reviewed-by: Peter Xu Signed-off-by: Axel Rasmussen --- tools/testing/selftests/vm/userfaultfd.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index fc40831f818f..1f65c4ab7994 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -278,13 +278,29 @@ static void shmem_release_pages(char *rel_area) static void shmem_allocate_area(void **alloc_area) { - unsigned long offset = - alloc_area == (void **)&area_src ? 0 : nr_pages * page_size; + void *area_alias = NULL; + bool is_src = alloc_area == (void **)&area_src; + unsigned long offset = is_src ? 0 : nr_pages * page_size; *alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, offset); if (*alloc_area == MAP_FAILED) err("mmap of memfd failed"); + + area_alias = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, shm_fd, offset); + if (area_alias == MAP_FAILED) + err("mmap of memfd alias failed"); + + if (is_src) + area_src_alias = area_alias; + else + area_dst_alias = area_alias; +} + +static void shmem_alias_mapping(__u64 *start, size_t len, unsigned long offset) +{ + *start = (unsigned long)area_dst_alias + offset; } struct uffd_test_ops { @@ -314,7 +330,7 @@ static struct uffd_test_ops shmem_uffd_test_ops = { .expected_ioctls = SHMEM_EXPECTED_IOCTLS, .allocate_area = shmem_allocate_area, .release_pages = shmem_release_pages, - .alias_mapping = noop_alias_mapping, + .alias_mapping = shmem_alias_mapping, }; static struct uffd_test_ops hugetlb_uffd_test_ops = {