From patchwork Wed May 19 20:03:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12268395 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 25164C433ED for ; Wed, 19 May 2021 20:04:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E88BD6135A for ; Wed, 19 May 2021 20:04:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232975AbhESUFk (ORCPT ); Wed, 19 May 2021 16:05:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232862AbhESUFZ (ORCPT ); Wed, 19 May 2021 16:05:25 -0400 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E035CC06175F for ; Wed, 19 May 2021 13:04:02 -0700 (PDT) Received: by mail-qv1-xf49.google.com with SMTP id v3-20020a0cdd830000b02901efe0c3571eso8469286qvk.5 for ; Wed, 19 May 2021 13:04:02 -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=HFkF1APt128Gb87FitaIP1LHWqXE7g4u5TT6f2wQ4F0=; b=WOlaU86HU/1wiYQFXxW5ZuNPd81yF5F3h/5AfU4FJMy585nY5GOaPe77m4ekQ2FSrh Mv1mHaP6YHLsueVlI1yCyW3fcfmDJhldtTmpq+lMSD2IHAB0XtXNJASRoqZFSYaq57Bp wLlitL1XcNBkcfgcuhYX4y1ZgGDdQbuTE9utqumoUpXb5wIOpXGhqsvI//9lOFNnn+VM FP1l14uYKc9N56P9Kd4qsiQGMawv//GlPha5iLE5JfkesYSpfIxNEWBndm1rssByWTmT AXv1jV99VT+M6wWwBTKZfP4CMQaXW/dzMkmkQQoN5iR3emQbm1JcdnbBNf4k03KUyKEB m4EQ== 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=HFkF1APt128Gb87FitaIP1LHWqXE7g4u5TT6f2wQ4F0=; b=CUa7I7RFlt2f1d8h9oIxsC3G0aCY5NOd+xi3OsmhcUqYUIJh/x9VtGmTdxIZZ0Bd9i LbPCDocdioIA7FY8nfuBQ6kFyduukINI7gxMrWPpTNHOiKJcTz8pT4kHVN+wT/9XNDQW /zFHfArTiiXfy6Bfp2LZSxU0tjA8U66sam586kjc8GJR+HTLIUzgbXdX1TOTQ3dAxC9m yiQ5GUBvFA6E8XFJcdOYT38YnPIMBVRx7IgomLsolnQyGxR+PMzEmlMH7toRbjnRF/3g I9I1/RqKMHFE8B7a4wBUOsjT6SN0/KrjKFcgYbfZTxtSJBm9cYihwCHIUjtR2QBwHxfe D8HA== X-Gm-Message-State: AOAM531oDpjS/dW3dnv2LfZ8KHV9PbK8qclDS6LBUKl3SARVK33l/ZUE tMnsejBjMVSC/GxZ1q0V5wwMYjIoXTDNdmJBC4fc X-Google-Smtp-Source: ABdhPJyiZ+Rq5FjXeCEqxMO3jbjzy8mY/ImH09Brk7H0/NIoihv7vEAq8zEuV/CaXrO+mt4U9hKoVUvSt3ppwkXoaINv X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:7eb5:10bb:834a:d5ec]) (user=axelrasmussen job=sendgmr) by 2002:a0c:e709:: with SMTP id d9mr1270050qvn.19.1621454641916; Wed, 19 May 2021 13:04:01 -0700 (PDT) Date: Wed, 19 May 2021 13:03:36 -0700 In-Reply-To: <20210519200339.829146-1-axelrasmussen@google.com> Message-Id: <20210519200339.829146-8-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210519200339.829146-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.751.gd2f1c929bd-goog Subject: [PATCH v2 07/10] KVM: selftests: add shmem backing source type From: Axel Rasmussen To: Aaron Lewis , Alexander Graf , Andrew Jones , Andrew Morton , Ben Gardon , Emanuele Giuseppe Esposito , Eric Auger , Jacob Xu , Makarand Sonare , Oliver Upton , Paolo Bonzini , Peter Xu , Shuah Khan , Yanan Wang Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Axel Rasmussen Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This lets us run the demand paging test on top of a shmem-backed area. In follow-up commits, we'll 1) leverage this new capability to create an alias mapping, and then 2) use the alias mapping to exercise UFFD minor faults. Signed-off-by: Axel Rasmussen --- tools/testing/selftests/kvm/include/test_util.h | 1 + tools/testing/selftests/kvm/lib/kvm_util.c | 15 +++++++++++++++ tools/testing/selftests/kvm/lib/test_util.c | 5 +++++ 3 files changed, 21 insertions(+) diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index fade3130eb01..7377f00469ef 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -84,6 +84,7 @@ enum vm_mem_backing_src_type { VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB, VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB, VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB, + VM_MEM_SRC_SHMEM, NUM_SRC_TYPES, }; diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index bc405785ac8b..e4a8d0c43c5e 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -757,6 +757,21 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, if (alignment > 1) region->mmap_size += alignment; + region->fd = -1; + if (src_type == VM_MEM_SRC_SHMEM) { + region->fd = memfd_create("kvm_selftest", MFD_CLOEXEC); + TEST_ASSERT(region->fd != -1, + "memfd_create failed, errno: %i", errno); + + ret = ftruncate(region->fd, region->mmap_size); + TEST_ASSERT(ret == 0, "ftruncate failed, errno: %i", errno); + + ret = fallocate(region->fd, + FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, + region->mmap_size); + TEST_ASSERT(ret == 0, "fallocate failed, errno: %i", errno); + } + region->mmap_start = mmap(NULL, region->mmap_size, PROT_READ | PROT_WRITE, vm_mem_backing_src_alias(src_type)->flag, diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index 06ddde068736..c7a265da5090 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -236,6 +236,10 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i) .name = "anonymous_hugetlb_16gb", .flag = anon_huge_flags | MAP_HUGE_16GB, }, + [VM_MEM_SRC_SHMEM] = { + .name = "shmem", + .flag = MAP_SHARED, + }, }; _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES, "Missing new backing src types?"); @@ -253,6 +257,7 @@ size_t get_backing_src_pagesz(uint32_t i) switch (i) { case VM_MEM_SRC_ANONYMOUS: + case VM_MEM_SRC_SHMEM: return getpagesize(); case VM_MEM_SRC_ANONYMOUS_THP: return get_trans_hugepagesz();