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AJvYcCU70oqCg+uLWDl8fgsQIELM+nIxPfVSiAYp9yBX6CTF1X7smGYNZ+dtWXZsrVPugQUC9dT7+xLD3g==@kvack.org X-Gm-Message-State: AOJu0Yz9wZka2HVFnNYrxdWj4nqaR5wBrGaNgUZnak1/+KX1iSQlyjjJ 4U1MGzyrBgcdT/zrEK/kPoxMe6GUejrhGc6BLYF1xIgMQ5GbiPk165RcNytxEIAxl4zUBdCqcLX M61FxzYEgBsEqpPX76hn+lb0Wqg== X-Google-Smtp-Source: AGHT+IHzx6Q3hHG57ljkrAP15mW/fSli8KOfzlU9yowcOYAMM7uKRQLpZuKh9dqK1n26N00k3XfO53kYXQVOFNP6YA== X-Received: from pjbpj3.prod.google.com ([2002:a17:90b:4f43:b0:332:4129:51b2]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:e7d0:b0:32e:23c9:6f41 with SMTP id 98e67ed59e1d1-33bc9b8dd13mr6981801a91.5.1760731989968; Fri, 17 Oct 2025 13:13:09 -0700 (PDT) Date: Fri, 17 Oct 2025 13:12:06 -0700 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.51.0.858.gf9c4a03a3a-goog Message-ID: <00b93a008a75a345f71b61ac67a2ffa068bc67d7.1760731772.git.ackerleytng@google.com> Subject: [RFC PATCH v1 25/37] KVM: selftests: guest_memfd: Test that truncation does not change shared/private status From: Ackerley Tng To: cgroups@vger.kernel.org, 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, linux-trace-kernel@vger.kernel.org, x86@kernel.org Cc: ackerleytng@google.com, akpm@linux-foundation.org, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@intel.com, chenhuacai@kernel.org, corbet@lwn.net, dave.hansen@intel.com, dave.hansen@linux.intel.com, david@redhat.com, dmatlack@google.com, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, haibo1.xu@intel.com, hannes@cmpxchg.org, hch@infradead.org, hpa@zytor.com, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgg@ziepe.ca, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maobibo@loongson.cn, mathieu.desnoyers@efficios.com, maz@kernel.org, mhiramat@kernel.org, mhocko@kernel.org, mic@digikod.net, michael.roth@amd.com, mingo@redhat.com, mlevitsk@redhat.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, peterx@redhat.com, pgonda@google.com, prsampat@amd.com, pvorel@suse.cz, qperret@google.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, roypat@amazon.co.uk, rppt@kernel.org, seanjc@google.com, shakeel.butt@linux.dev, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, tglx@linutronix.de, thomas.lendacky@amd.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, wyihan@google.com, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 391BCA0007 X-Rspamd-Server: rspam03 X-Stat-Signature: 59jcbd9xcfee56daesidfxxuyyx71ajh X-HE-Tag: 1760731991-799242 X-HE-Meta: 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 XDkGaNWI TF6x4Bd08MLccOcvBAVH5/ae1fQFhEhVRP7xx7hLkjAaGgQCJBDvER1HMkGvA+IPgghPGYgFKNkz0nV+PK/cY4pIV2ztjJk6EGCHA/BYT37jFTrZ1DU8Y/Fw1SrfU5dP6kjEUKnqezLALXhmmnfYPiLQ/6suJ7y7uNg5SfAF8Ev7GoMeJQ0UnTrfPndDBD/CvQ9mdZIaUq84OheSUhUkMyE1tHHSbZrN9C7O3SF4JLn/YY9GRqs0tI8xO+zicR2W5QOftPsETPd4BUi6Rn5MIiGrjBthKwEjGVoHsAnXqenP/8IJUvW5yeVOgW4BPoXpunxl7hQ31SoD3KZ29NVeWF2ioanp/Z2BN0xyr4CDwMdIhjx47u96nXYmpHCcC0T1xtuCTdN6PptjkB8UWrveG8tlwHe5FBincxPXdvwiwKZFZi78YZGNtcSm4GFeroqXqP9hxRvaNqoRTzql64dkcvxsuhEh8h7uCZzlsOwl3oouxiGgsubLfeHkCeLXKFkKT9fksPWQyVp0EqkEoLKMTSPI+eLQQcjUipfJMiDwiZaaN6ubpKVXKC0qdtA7ZgU+WGzcSYU3XFSi1ADUpM1wbpqix+i5y1aKm7wHDC8fw7OS6QRnj8z6vAGOwNP2IwEAE3WQOUHQJfqIrLcCR6riCKMngdtCKk/LGaemqtqVmmk+NX3Ua4yyylrPZXYkySXwQn00TTPzamT+PMZPAKUt9Ydfu4DXcrW98QqqvwegCP3morfE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a test to verify that deallocating a page in a guest memfd region via fallocate() with FALLOC_FL_PUNCH_HOLE does not alter the shared or private status of the corresponding memory range. When a page backing a guest memfd mapping is deallocated, e.g., by punching a hole or truncating the file, and then subsequently faulted back in, the new page must inherit the correct shared/private status tracked by guest_memfd. Signed-off-by: Ackerley Tng Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson --- .../selftests/kvm/guest_memfd_conversions_test.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c index 43efe4af1403c..907d415d72315 100644 --- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c @@ -10,6 +10,7 @@ #include #include "kvm_util.h" +#include "kvm_syscalls.h" #include "kselftest_harness.h" #include "test_util.h" #include "ucall_common.h" @@ -316,6 +317,19 @@ GMEM_CONVERSION_MULTIPAGE_TEST_INIT_SHARED(unallocated_folios, 8) test_convert_to_shared(t, i, 'B', 'C', 'D'); } +/* Truncation should not affect shared/private status. */ +GMEM_CONVERSION_TEST_INIT_SHARED(truncate) +{ + host_do_rmw(t->mem, 0, 0, 'A'); + kvm_fallocate(t->gmem_fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, page_size); + host_do_rmw(t->mem, 0, 0, 'A'); + + test_convert_to_private(t, 0, 'A', 'B'); + + kvm_fallocate(t->gmem_fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, page_size); + test_private(t, 0, 0, 'A'); +} + int main(int argc, char *argv[]) { TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)); -- 2.51.0.858.gf9c4a03a3a-goog