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a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Developer-Signature: v=1; a=ed25519-sha256; t=1787735885; l=2066; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=hllAZwlWW+ih1BmS23q9euXZautp6FkTBIIgcqLkrqc=; b=qsiVu/whfm9O8+e9PDF2qnZWi29DuDjd8KVnXJuUZNQ15/zioWZ2WGZ+Gc5d2n0THQKCtwyLF S93gEjTSxmiDnf4G6GH5/pNYzc3coo+pUgB7Mig8s+PQSoK8gbUsyxb X-Mailer: b4 0.16.0 Message-ID: <20260826-gmem-inplace-conversion-v11-35-0a15d8a799aa@google.com> Subject: [PATCH v11 35/46] KVM: selftests: Test that truncation does not change shared/private status From: Ackerley Tng To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, jmattson@google.com, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, liam@infradead.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , Jason Gunthorpe , John Hubbard , Peter Xu , tarunsahu@google.com, Fuad Tabba , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Ackerley Tng Content-Type: text/plain; charset="utf-8" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E4F1E40007 X-Stat-Signature: 9wbded18q34bn39z4gafq335n1hnd1oh X-Rspam-User: X-HE-Tag: 1787735948-945661 X-HE-Meta: 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 TfyvToK7 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 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. Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson Reviewed-by: Fuad Tabba Tested-by: Shivank Garg Signed-off-by: Ackerley Tng --- .../selftests/kvm/x86/guest_memfd_conversions_test.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c b/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c index acdff2d154046..b7a54d2a90928 100644 --- a/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/x86/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" @@ -312,6 +313,19 @@ 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)); -- 2.55.0.887.g758fc8c411-goog