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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92BB0C9832A for ; Sat, 26 Sep 2026 00:51:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3B1026B00A2; Fri, 25 Sep 2026 20:50:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2ECF96B00A4; Fri, 25 Sep 2026 20:50:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 18B9E6B009F; Fri, 25 Sep 2026 20:50:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id D49DE6B00A4 for ; Fri, 25 Sep 2026 20:50:57 -0400 (EDT) Received: from smtpin09.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 58C48A696B for ; Sat, 26 Sep 2026 00:50:57 +0000 (UTC) X-FDA: 85254083754.09.AF37911 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf10.hostedemail.com (Postfix) with ESMTP id 5B0A2C0005 for ; Sat, 26 Sep 2026 00:50:55 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="gnu/hdLL"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf10.hostedemail.com: domain of devnull+ackerleytng.google.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+ackerleytng.google.com@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790383855; h=from:from:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rf0rckPaB6L0nziF5tqyB1o4FRUkOiMVFAPZejHnrSc=; b=rEo8IEn7kuBPBu+cZEoBKsNXTdN6Rp/EffC26gG6LVwrKRIQEwS3KDuT2NK2tmsVIeLCHU d9KMvZeK3oEc+wyK2NwOA1IeuWS9H+8uC/alMtjyZDWURxui77SSJFhgFhaiuysrpCsMr4 UXvVxo/2ETOlwjAdI+AgzFl02THK+nI= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="gnu/hdLL"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf10.hostedemail.com: domain of devnull+ackerleytng.google.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+ackerleytng.google.com@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790383855; b=1J/unWwDFVsUrZXPnrA1y9hptxFufSEUZjJE0pFQUK6tgkZHDZT0WBd9+6/MeB3lvCgdkV 9yxIZkGZN78mXa1U7h8bTX7qNrHCVH+FwO6YHxu8i3Zpt9J91WahdYpGEgIZGr4HBC0Br6 fuNNE3o9ayO/5BD3MlS7LiPYn4oPGc0= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id E994C447C4; Sat, 26 Sep 2026 00:50:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id C714DC2BD01; Sat, 26 Sep 2026 00:50:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1790383851; bh=ZQkHIEo90myH/etAY2BZvV0PdV/I+2f0qu5W0si1/Vg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=gnu/hdLL/8rQ1eCpICBDMgQ5bdAfMXUZB6QclisY2veSfL3KWIII4fqBZJYUbNLXp gQeewK6auA3yOn1u0DybDlBl1Ma8sRYeKLTxqDUEH0E9tQKvnfdlPLP1VBfE1GIjZh OIp5kyd8evCiqHhDMCft3eUwZrsrYf6hOBXhO/DHPmm664vH5pQ4Y8xto2O7yG7Lw/ Gyk79kiUiMgS4apZ8IdUqc+/Cp8VQNlKPRNIrQUzir4XO3B78NowK3TpB0eaqESPmR UL1NrQQMWmCfQgNokiG42aDhn2vItl+BXAterA85xlL75uU2yAvZZ+J5uO+Gy5hR7L IDfa0vpXFdngA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2F4BC98331; Sat, 26 Sep 2026 00:50:51 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 25 Sep 2026 17:50:55 -0700 Subject: [PATCH RFC 08/17] KVM: selftests: Test rejection of tmpfs file for resource_fd MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260925-gmem-tmpfs-backend-v1-8-d36159822d18@google.com> References: <20260925-gmem-tmpfs-backend-v1-0-d36159822d18@google.com> In-Reply-To: <20260925-gmem-tmpfs-backend-v1-0-d36159822d18@google.com> To: Hugh Dickins , Baolin Wang , Andrew Morton , Sean Christopherson , Paolo Bonzini , David Hildenbrand , Jonathan Corbet , Shuah Khan , Randy Dunlap , Shuah Khan , vannapurve@google.com, erdemaktas@google.com, jxgao@google.com, rientjes@google.com, fvdl@google.com, jthoughton@google.com, tarunsahu@google.com, pratyush@kernel.org, fuad.tabba@linux.dev, Gregory Price , David Woodhouse , yan.y.zhao@intel.com, michael.roth@amd.com, suzuki.poulose@arm.com, Christian Brauner , Jason Gunthorpe , Nicolin Chen , Xu Yilun , aik@amd.com, aneesh.kumar@kernel.org, Vlastimil Babka Cc: kernel-team@android.com, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Ackerley Tng X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1790383850; l=1833; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=pY+7zel/xk6auUHj9TI6BcpE5A6Lb+XZc+WYc5WnDfM=; b=6ICqdR//hE/RTxLIzxROFfy94V96cNAwZqPG5viJrO4RVBZA3wcH6/zTFcVp2BIl7ddnTJ1D3 XWEO8D7UwtkBxgYBX0V2bQmanCnt1ukpEayqoKxStzdpPNHwXUpIqF5 X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com X-Stat-Signature: awwmmqkmh7jb95ftj4sr95m7t9bnj9nt X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5B0A2C0005 X-HE-Tag: 1790383855-830024 X-HE-Meta: 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 cyBhwCAT Mx3O6lSXW8gO2fGuCLcDbB4iSqesuKaoMzdArMb+3CSWT+U6oPR4hOa6l8uJZx5DFfSUKUgj4IHFkqRP35ezuyDK02OlTIw+1fq4FDOXw2W1M23G2Gl14tqzUoNeNqoi8cxSr5I4tBarJIhEMW3qdlmMkoHa3SFoS7reOKjJVCBaACqjF2c939TQQ1MmcgUNXP3w83ulIVBSBfTZtKcw4i2YsGbeg79Fk2+uvopSGvThoTKwoGI01hGnD4/rVcYXaFfju9GPjA0Tg2MpFaBmwyiVLRsCNmJJzftZOWkVr9kLAvmH+fiPLOJ1bGTRrIguQ9EQteZeaEeR3YmJzWaQPZxK6X9vwKtTTS4ct845QahT63SE6WLRmy9sjI78lqYGZiBR6EAQELBfmTtX2MvafSvxJKCV/XHkfjxCuIPiZymj5jSiPUzGdBCYUSZlpLUh1XJxFSSU2YGStgJZcHuFAiERFfAddYJLzOim4ht5lqlo4dGJi2qYlFz8hpwReBrJmpKdqPSCTmEPAz5v9uzaeRvXMeReaRjBb8fwn Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ackerley Tng Add test coverage verifying that passing a regular file from tmpfs as a resource file fails with ENOTDIR. Only directory file descriptors representing the mount root are supported as resource pools. Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/guest_memfd_test.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 31bc74c4c26bd..a7a1b5470cb2c 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -457,6 +457,26 @@ static void test_resource_fd_unsupported_fs(struct kvm_vm *vm) close(file_fd); } +static void test_resource_fd_tmpfs_file(struct kvm_vm *vm) +{ + int fd, file_fd; + + /* + * Passing a regular file from tmpfs (e.g. via memfd) is rejected by + * the provider attach callback with ENOTDIR because only directory + * FDs representing the mount root are supported resource pools. + */ + file_fd = memfd_create("test_tmpfs_file", 0); + TEST_ASSERT(file_fd >= 0, "memfd_create failed"); + + fd = __vm_create_guest_memfd_resource(vm, page_size, + GUEST_MEMFD_FLAG_USE_RESOURCE, + file_fd); + TEST_ASSERT(fd < 0, "guest_memfd with tmpfs file fd should fail"); + TEST_ASSERT_EQ(errno, ENOTDIR); + close(file_fd); +} + #define ____gmem_test(__test, __vm, __flags, __gmem_size, args...) \ do { \ int fd = vm_create_guest_memfd(__vm, __gmem_size, __flags); \ @@ -517,6 +537,7 @@ static void test_guest_memfd(unsigned long vm_type) test_resource_fd_invalid(vm); test_resource_fd_unsupported_fs(vm); + test_resource_fd_tmpfs_file(vm); __test_guest_memfd(vm, 0); -- 2.56.0.rc1.315.gc6ed9934b7-goog