From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3483731AA92; Sat, 26 Sep 2026 00:50:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790383852; cv=none; b=h1yBo2JWgGEu7zSNQn/2TobfLuUVp678xR+JXKXJsUUo1ic9oX4u9DkcP6hjQ33Et4S2GYEESqIMWH+Aej5vJw8DewY9eWgWt1qKEKdznZ3cBt+PWMyfN2zPHkykm6UIokKAjzmNrezzK7xvArtkue49Z17psIiqbSdkSataGxM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790383852; c=relaxed/simple; bh=clzJl7tat7edqHdDSmDO0zl3L0rUROd5Ujs5P0wIAzk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=HxYiJLa59Wyp6UEIl8EnCK2V68x0hCQ94xeym68Hy5KEWruBdj1PLso3KYTM6wXnvF1AS9NJwmOZnp4LS9og8uOjNgbbKC+orVf7xIMkN7XDRL84NVgKSfdT4af7xK8IcYY15EHs+a42OAyaaJSzR5+swISUJFx8zUVdgrlP6RI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CIQ2+pr1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CIQ2+pr1" Received: by smtp.kernel.org (Postfix) with ESMTPS id 0BB5FC4AF13; Sat, 26 Sep 2026 00:50:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1790383852; bh=clzJl7tat7edqHdDSmDO0zl3L0rUROd5Ujs5P0wIAzk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=CIQ2+pr1/IFy1J/Cqj4xAxFux/GIa20NPau6WtfoEaI34fPTFtJyPnFqcyYL8ObnE TnWxKE2Hxw4sMDJYa/Ckq8gdthUDuYAw4r/VWKJxWi3CukaUmmdTgcCZpMSbjXVqY1 78h3b85NmurNGGPwHvKk+MycCnRDgDghOBaopcuAa0L88dcwRrMyBUXW4o/WicUnZw uFI29kJeWFuq9nEtT/e3CLso0y1kXapkhMeM3H9qMfcamQ2J3l/ZfP8NkNEPd5Cu7F FfPUS3t3uwyGhHGoFlWbJ9ON7yN/XIyViunsF+WGWlGYCWBeelYKtx/7sNeHfKq8HV Y4rwL8EOMdA0Q== 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 EB871C98331; Sat, 26 Sep 2026 00:50:51 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 25 Sep 2026 17:50:58 -0700 Subject: [PATCH RFC 11/17] KVM: selftests: Test guest_memfd with anonymous fsmount() tmpfs pool Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260925-gmem-tmpfs-backend-v1-11-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=2594; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=Si9JGry309vjF8hKL0mCR4ckxqZZ+FxcLQB0xL3xoag=; b=PyIIYTVR6N2jUy7YaNCs+XJW/WTb8muHJXoGFl1QAit/5T4X7y8M5Oq8R5MHlWF7Xs+QkWAos p6iAVxid4mbCy3dVT3rzd/VcyoiQCU2KkivZkLfKJ9j/KwsTlzd0Lpd 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 From: Ackerley Tng Add test coverage verifying that creating a guest_memfd backed by an anonymous tmpfs mount descriptor returned by fsmount() succeeds and reports the requested file size. Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/guest_memfd_test.c | 35 ++++++++++++++++++++------ 1 file changed, 27 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index e8199ed17b0f8..73212d5307049 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -541,12 +541,23 @@ static void test_resource_fd_tmpfs_huge(struct kvm_vm *vm) close(pool_fd); } -#define ____gmem_test(__test, __vm, __flags, __gmem_size, args...) \ -do { \ - int fd = vm_create_guest_memfd(__vm, __gmem_size, __flags); \ - \ - test_##__test(args); \ - close(fd); \ +#define ____gmem_test(__test, __vm, __flags, __gmem_size, args...) \ +do { \ + int pool_fd = -1; \ + int fd; \ + \ + if ((__flags) & GUEST_MEMFD_FLAG_USE_RESOURCE) { \ + pool_fd = create_tmpfs_pool_fd("never", true, __gmem_size); \ + fd = vm_create_guest_memfd_resource(__vm, __gmem_size, \ + __flags, pool_fd); \ + } else { \ + fd = vm_create_guest_memfd(__vm, __gmem_size, __flags); \ + } \ + \ + test_##__test(args); \ + close(fd); \ + if (pool_fd >= 0) \ + close(pool_fd); \ } while (0) #define __gmem_test(__test, __vm, __flags, __gmem_size) \ @@ -606,15 +617,23 @@ static void test_guest_memfd(unsigned long vm_type) test_resource_fd_tmpfs_huge(vm); __test_guest_memfd(vm, 0); + __test_guest_memfd(vm, GUEST_MEMFD_FLAG_USE_RESOURCE); flags = vm_check_cap(vm, KVM_CAP_GUEST_MEMFD_FLAGS); - if (flags & GUEST_MEMFD_FLAG_MMAP) + if (flags & GUEST_MEMFD_FLAG_MMAP) { __test_guest_memfd(vm, GUEST_MEMFD_FLAG_MMAP); + __test_guest_memfd(vm, GUEST_MEMFD_FLAG_MMAP | + GUEST_MEMFD_FLAG_USE_RESOURCE); + } /* MMAP should always be supported if INIT_SHARED is supported. */ - if (flags & GUEST_MEMFD_FLAG_INIT_SHARED) + if (flags & GUEST_MEMFD_FLAG_INIT_SHARED) { __test_guest_memfd(vm, GUEST_MEMFD_FLAG_MMAP | GUEST_MEMFD_FLAG_INIT_SHARED); + __test_guest_memfd(vm, GUEST_MEMFD_FLAG_MMAP | + GUEST_MEMFD_FLAG_INIT_SHARED | + GUEST_MEMFD_FLAG_USE_RESOURCE); + } kvm_vm_free(vm); } -- 2.56.0.rc1.315.gc6ed9934b7-goog