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 69AE032AABC; 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=RQaT/eZBH80gia68JQe5aych7mFAdMhbZMdwoLNN/N5el1EvbsBf+PQjtB6G2COZpxwk4I/D2xhLA8hTOThKntIzRtii4CoxJUaXy78BnczMhv6o6zGVJB+A1cfEkvYpM1J7frM5iN2O+Tt1C2OyGj2sA+9c9g11CIoFGhUjlSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790383852; c=relaxed/simple; bh=n+q1qgFLiSwvjUPpDAXg+gMGkb9JtV4aKYDtoDohKlo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=tLaT+7x6//W36194JaQyf8iHtavuBh1IP0MwblwcQcjWQ0bjj5H8sK+ITAlqf0ftLhe2H/FdMLxo9kgpGB7eBy0HGlItcbgGuJJj3YM4YauZ4OI3TGjvAOI+WFUtp64jl0xHGaAoA66cPfpJVK7a4c2A+TGosYQUPRAyy4aypPw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=T4ZJIXko; 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="T4ZJIXko" Received: by smtp.kernel.org (Postfix) with ESMTPS id 4A991C2BCF4; 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=n+q1qgFLiSwvjUPpDAXg+gMGkb9JtV4aKYDtoDohKlo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=T4ZJIXkomUX+C339mTXSfpVBbkd+iDAy47mofvTXwI7dxotGESB6mJNaacxyB4JgV R/0t6pjDCA2FY+ghcii20tO4VkIMmU3A6uGbUZ+AzTl2l1p2ns8f9iooHD72Fa8qsX sdpRlb/xWk0Ps/CW36hYg8Rd4fS+V64iQ9ZmZYqsFvMX5X+3oyQLxMQv+vxWaaGVsq otZ0pq92bdjhqVxf0jUiJU4DHl/Ws97djuhOohXuyW1I0cP7Vb3f+lBkdtAjYlcQVC HUvIIAjExqjrmDzuy4cTZ+qtB0cxmKmEp7DZ8tbQDYZhnpK5vWjYAw5qVHouuHSJpj 9g9Ph5fEeKQPA== 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 30A9BC9830E; Sat, 26 Sep 2026 00:50:52 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 25 Sep 2026 17:51:01 -0700 Subject: [PATCH RFC 14/17] KVM: selftests: Test memory allocation against shared tmpfs resource 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-v1-14-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=1937; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=e5T0d60S1RJIK+yOTmGq9i0vT2WW1I1oApGjOS3UiOo=; b=9FIMY/6EtN+BUMK9CipyVOXFBib9h5+8+GiXMOwHojyWfqXUItP+KcJF14AQK4ZJmIOmh91rJ ZO/6zjGODO0B0t6LgIt14X3vvd4keOV4Nh9d0fwsEHcMg4dK1F0E3fr 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 Verify that allocating folios in multiple guest_memfd instances sharing the same tmpfs resource pool consumes blocks from the underlying pool as reported by filesystem statistics. Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/guest_memfd_test.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 81311be059923..4610eeab39be6 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "kvm_syscalls.h" #include "kvm_util.h" @@ -545,7 +546,8 @@ static void test_resource_fd_tmpfs_huge(struct kvm_vm *vm) static void test_resource_fd_tmpfs_shared_pool(struct kvm_vm *vm) { - int pool_fd, fd1, fd2; + int pool_fd, fd1, fd2, ret; + struct statvfs svfs; struct stat st1, st2; pool_fd = create_tmpfs_pool_fd("never", true, page_size * 2); @@ -573,6 +575,18 @@ static void test_resource_fd_tmpfs_shared_pool(struct kvm_vm *vm) TEST_ASSERT(st1.st_ino != st2.st_ino, "different guest_memfd instances should have distinct inodes"); + ret = fallocate(fd1, FALLOC_FL_KEEP_SIZE, 0, page_size); + TEST_ASSERT(!ret, "fallocate on fd1 should succeed"); + + TEST_ASSERT(!fstatvfs(pool_fd, &svfs), "fstatvfs on pool_fd should succeed"); + TEST_ASSERT_EQ(svfs.f_blocks - svfs.f_bfree, 1); + + ret = fallocate(fd2, FALLOC_FL_KEEP_SIZE, 0, page_size); + TEST_ASSERT(!ret, "fallocate on fd2 should succeed"); + + TEST_ASSERT(!fstatvfs(pool_fd, &svfs), "fstatvfs on pool_fd should succeed"); + TEST_ASSERT_EQ(svfs.f_blocks - svfs.f_bfree, 2); + close(fd2); close(fd1); close(pool_fd); -- 2.56.0.rc1.315.gc6ed9934b7-goog