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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260507-gmem-inplace-conversion-v6-33-91ab5a8b19a4@google.com> References: <20260507-gmem-inplace-conversion-v6-0-91ab5a8b19a4@google.com> In-Reply-To: <20260507-gmem-inplace-conversion-v6-0-91ab5a8b19a4@google.com> 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, ira.weiny@intel.com, 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, tabba@google.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 , Baoquan He , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Jason Gunthorpe , 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 X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1778185365; l=1978; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=QNfw7b73J7vj15/th5fWC7j7jqgWwkpDG4rP+UWwHUU=; b=hAKgjuZBHqtxWzkPWa8rgewxusBILrhFp1kYpa3PMkHdahjFtlh4RKgr1BvxX4yNiWMKdlGJ8 89V/iDxeKTiB/V7JuEAGdqTjYmoNU/JCZmPnz/+yWuvyAbxZGoFCQnm 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 X-Rspam-User: X-Rspamd-Queue-Id: B33754000C X-Rspamd-Server: rspam04 X-Stat-Signature: 8aswkff783u93aekn7815m6d3tdxyj9o X-HE-Tag: 1778185385-844960 X-HE-Meta: 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 1hLucYM7 cfAix/IcYIDD5N8250bUpXJ+hL0QWTX0UrDmVjXjPpygcOv2k3EAukFUwWjvkhWzxT1oBf/v5F+/8b29kbQKRN4a57sZJcBgEymTr8zxZRg+9w9BjEswd9phNYKjKRuUSmaMHbgmMHRYd3601cyKlAHORWKz2+JWNOZ0cAx29MjmDJrCL8VtCpk2PLoCDf7piBENgvI3CauFOVXjg347PFQaeAHeTDAe/SBf1oNXmYjH1Jo34+XDVVgquaN/snsqEpQDGiz5Hd7jlGsU81U3KJf39QZhVAOtpr/RahJKYt3p4Ty4xkhu+cAjT+I0DbamEDqrGALTcTm3p2x7JGC66CMykUneIwY0FbMfWs9D2JzHxlLUveYbL/Gd9xhGEr/R+Zqtj/UMD/XhBnizFw0kO+b1Kj/u0ABc3FNDZtvO/FW3LTgckXZFGyyO9T6EyG5vNDCxGequld/6bp4Y= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ackerley Tng 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/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 21d33e2814f9e..960b2da8dd16d 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" @@ -309,6 +310,19 @@ 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)); -- 2.54.0.563.g4f69b47b94-goog