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charset="utf-8" Message-Id: <20261022-gmem-alternative-providers-v2-15-5dd1dc6c660a@google.com> References: <20261022-gmem-alternative-providers-v2-0-5dd1dc6c660a@google.com> In-Reply-To: <20261022-gmem-alternative-providers-v2-0-5dd1dc6c660a@google.com> To: Alex Williamson , Alexander Graf , Alexander Viro , Alexey Kardashevskiy , Andrew Morton , "Aneesh Kumar K.V" , Ashish Kalra , Baolin Wang , Baolu Lu , Bill Wendling , Borislav Petkov , Catalin Marinas , Christian Brauner , =?utf-8?q?Christian_K=C3=B6nig?= , Connor Williamson , Dave Hansen , Dave Jiang , David Hildenbrand , David Rientjes , David Woodhouse , Erdem Aktas , Frank van der Linden , Fred Griffoul , Fred Griffoul , Gregory Price , "H. Peter Anvin" , Hugh Dickins , Ingo Molnar , Jacob Pan , James Houghton , Jan Kara , Jason Gunthorpe , Jianxiong Gao , Joerg Roedel , Joey Gouly , John Starks , Jonathan Corbet , Justin Stitt , Kevin Tian , Lorenzo Stoakes , Marc Zyngier , Michael Roth , Mike Rapoport , Nathan Chancellor , Nick Desaulniers , Nicolin Chen , Oliver Upton , Paolo Bonzini , Pratyush Yadav , Randy Dunlap , Robin Murphy , Samiullah Khawaja , Sean Christopherson , Shuah Khan , Steffen Eiden , Steven Price , Suzuki K Poulose , Tarun Sahu , Thomas Gleixner , Tom Lendacky , Tycho Andersen , Vishal Annapurve , Vlastimil Babka , Will Deacon , Xu Yilun , Yan Zhao , Zenghui Yu , x86@kernel.org, Shuah Khan , Fuad Tabba Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1792711665; l=1933; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=6KatK9dzFsYDMnh/WM/jXUR/ewN8CiU3pBTeSrOUg04=; b=/P+rFa6MKAfQ2FTprf3qC1Fg/EKnBnijzsSsQS2H5G5qu40sLn36wx0KQjpfUJhsF9CA7l2TL bew/od/tWxCBRVJTmLYmpanhJYxYOMXUjYVGl6TYFsFTaGw8xcGDA0j 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 Content-Transfer-Encoding: 7bit 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 310a45b6656aa..639b1b0c204ed 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "kvm_syscalls.h" #include "kvm_util.h" @@ -564,7 +565,8 @@ 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); @@ -590,6 +592,18 @@ 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); -- 2.56.0.257.gf7497c7d27-goog