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 B5CE6C9832A for ; Sat, 26 Sep 2026 00:51:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C8AB06B009E; Fri, 25 Sep 2026 20:50:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C12F96B00A2; Fri, 25 Sep 2026 20:50:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A8D086B00A0; Fri, 25 Sep 2026 20:50:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 74B5C6B0099 for ; Fri, 25 Sep 2026 20:50:57 -0400 (EDT) Received: from smtpin24.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 04E49160811 for ; Sat, 26 Sep 2026 00:50:56 +0000 (UTC) X-FDA: 85254083754.24.0B7E75D Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf02.hostedemail.com (Postfix) with ESMTP id 0EE4880005 for ; Sat, 26 Sep 2026 00:50:54 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ZW4YcAr8; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf02.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=udtcUyWE1uSFW5Ldwkw5o6zimv2R2aYRb8MqWJMRgKE=; b=tUXkGI8KW5mtN3ZFKS3tTTzjqZa8Ocrd4qYZlB5pZ7so+xwkAuCcNo8QM1nseMYB2huXp6 O02+mIRjKRv4lw58ClVYC7XEVJQ+xBfY7Wql+G64mmMNsixGs19to+yNU0GTGrUEQN4zI0 zneJDDdWjMZA9UlUJU2nQJjwXXHFlPo= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ZW4YcAr8; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf02.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=AG/nTw73wahUGQGM57P7xEWn5pgLnuHC5EwQIVJkNEIbi5yKb+fbRIqnBhNlq4h+juSkuK o04pM4aTsvPG0cOuk36ukneoKJiznXtqQ8KVabszhK/HbdQPdb8sx2MtVaT8x7JEMzFbFZ b/q3n2sOdeh4L5JbY7dz2upTmz9Xg4g= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 0D4CA447CF; Sat, 26 Sep 2026 00:50:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id D9A6CC2BCFD; 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=liqnGaVxdQZUr+SxRatM6jYTFXLCR3vxDWNamKgblq8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=ZW4YcAr8zEw6RprjXZNXegMg6fPKlJpw8XAr2KcCvJKDVNDelpLV72b9a6ZP1+P3e 2RDkg56kZ0PXG4m7HEWSbD0+vSMrd6Z3ddVRykS3xlJqGb+ZFzaPtfV77bqY8mGtZS zp5PJkIL0EZUucw/9u7eFdonuism8eoWK33TgVlR6NOnYGZ37ezHaMUXtyfrbpEI1N 2fYv0i1TFE3f1Yqh6hNTD4KvZKhGv578rTeVbpAqrNEFZM7Z5ApZqBM1no28cL7nny OJ8uD2fORW7YLwDKJGGR3KzHaASjN9egcObI3/t5SQ2c2+Zm4Z0jN49fohRtSZrgWY TzqnL9eysI6HA== 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 C76B0C9832A; Sat, 26 Sep 2026 00:50:51 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 25 Sep 2026 17:50:56 -0700 Subject: [PATCH RFC 09/17] KVM: selftests: Test rejection of swap tmpfs mounts MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260925-gmem-tmpfs-backend-v1-9-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=2877; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=5xkNo+br1h4L99FBlpcbpIchm5gYtDbafhYivlve/RE=; b=Yf0MTimFpeP1F0O9CabGUA5VbTmVvRQvNwWt9G2lt6epCRofDg+tFnu1TRfsb8Q00G+NQPfQ2 LYbxro03D5JCDwPzJ9nW2zl6/2PFMe9fGlCcRtB9BWU+1IAXEAkqVxq 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: dug36gpcknkwgqdkqmtcoafu98d98c8g X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 0EE4880005 X-HE-Tag: 1790383854-218333 X-HE-Meta: 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 rBWevHZ6 O4ap6JX4C38av5UUap0ZLbeaMwmWdFyTYeXhHqvez4aaKfmYTOn+D0VuOLROYcLDu4cEOFiH2H2wLjk7eMnlP2zpvC4l83qAimrSa6RlwW2L6pJyHqV05jadxcQB6tj481GVas1Culnog7U6chWDqtvQZDT2j0le/1sRhFX/JZUy98fxgGfhQsJmBsATRZ5hKzBjybbjgqSRmwXwN43lpO8LxhlxM91T2fKScNmgSUJp8V9RscrymzevfdyPYqJC5pPswTEjMRtSL9hom2viSCI8oHDUVpD5S9JQGae6olxYyD41Ea42JhX69WHTaEsAKQtVmjW3ro1pX7oV8/lcrPhhX0vdHWqMTmcPu6rXSmQLTFdVe02cOoMvKVhdgi6fnBwCnqK4zGa73UgEB8pmvAi06OZfMaVsK11UjnDwXzfkOkwc2ijONHnbvhkH0iYuQ75+RQmUWI8rhj2+fvE+8xgEjdJYN2aS2MrCvwUxYJnN+Ti4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ackerley Tng Ensure that guest_memfd creation fails with -EINVAL when passed a tmpfs resource pool mount descriptor that has swap enabled, as required by the tmpfs guest_memfd provider implementation. Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/guest_memfd_test.c | 50 ++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index a7a1b5470cb2c..5d017164d7b45 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -13,6 +13,7 @@ #include #include +#include #include #include #include @@ -477,6 +478,54 @@ static void test_resource_fd_tmpfs_file(struct kvm_vm *vm) close(file_fd); } +static int create_tmpfs_pool_fd(const char *huge, bool noswap, size_t size) +{ + char size_str[32]; + int fs_fd, mnt_fd; + + TEST_ASSERT(size && IS_ALIGNED(size, page_size), + "Pool size '0x%zx' must be positive and page-aligned", size); + + fs_fd = syscall(__NR_fsopen, "tmpfs", FSOPEN_CLOEXEC); + TEST_ASSERT(fs_fd >= 0, "fsopen failed"); + + if (noswap) + TEST_ASSERT(!syscall(__NR_fsconfig, fs_fd, FSCONFIG_SET_FLAG, + "noswap", NULL, 0), "fsconfig noswap failed"); + + if (huge) + TEST_ASSERT(!syscall(__NR_fsconfig, fs_fd, FSCONFIG_SET_STRING, + "huge", huge, 0), "fsconfig huge failed"); + + snprintf(size_str, sizeof(size_str), "%zu", size); + TEST_ASSERT(!syscall(__NR_fsconfig, fs_fd, FSCONFIG_SET_STRING, + "size", size_str, 0), "fsconfig size failed"); + + TEST_ASSERT(!syscall(__NR_fsconfig, fs_fd, FSCONFIG_CMD_CREATE, + NULL, NULL, 0), "fsconfig create failed"); + + mnt_fd = syscall(__NR_fsmount, fs_fd, FSMOUNT_CLOEXEC, 0); + TEST_ASSERT(mnt_fd > 0, "fsmount failed"); + + close(fs_fd); + return mnt_fd; +} + +static void test_resource_fd_tmpfs_swap(struct kvm_vm *vm) +{ + int pool_fd, fd; + + pool_fd = create_tmpfs_pool_fd("never", false, page_size); + + fd = __vm_create_guest_memfd_resource(vm, page_size, + GUEST_MEMFD_FLAG_USE_RESOURCE, + pool_fd); + TEST_ASSERT(fd < 0, "guest_memfd with swap-enabled tmpfs should fail"); + TEST_ASSERT_EQ(errno, EINVAL); + + close(pool_fd); +} + #define ____gmem_test(__test, __vm, __flags, __gmem_size, args...) \ do { \ int fd = vm_create_guest_memfd(__vm, __gmem_size, __flags); \ @@ -538,6 +587,7 @@ 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_resource_fd_tmpfs_swap(vm); __test_guest_memfd(vm, 0); -- 2.56.0.rc1.315.gc6ed9934b7-goog