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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260428-gmem-inplace-conversion-v5-39-d8608ccfca22@google.com> References: <20260428-gmem-inplace-conversion-v5-0-d8608ccfca22@google.com> In-Reply-To: <20260428-gmem-inplace-conversion-v5-0-d8608ccfca22@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, 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=1777418714; l=1978; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=Bf9VYURnTgb4TwvCJyU5mwma0raoYBRglUIu1BddfsA=; b=Sy3fBvTvGT1l7P1754XNGwhnHr5V9qJNv9e3LC5taI2eQg7S9WzmF2LhNSMc6bbYXC5UjP7XV g61CrfU/Av3A6d5LctiXFLDMlkZ9ifHKNPN3O6xFeLM86WNKXhjnss1 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: 0E2A310000E X-Rspamd-Server: rspam06 X-Stat-Signature: e5z35igdsac9ntued45ftngydqx8c3q9 X-HE-Tag: 1777418737-581683 X-HE-Meta: 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 jFVXEJZ0 7tklI+ws2ZgrxFoUTmKpP4ofE4jb4O79UxSjA5qCrOB1kxtc6M9R/B6eIgl/wQTabbjtR7jFULrt4pbrFZWRQ/gZKxOmBFXyviVOVqkkQ6Z/yVHHA6nzynD/yLV7DMBTqVrHRdGYvKGbTFHZNWV+s+xUf04WwvRBVGaR2vLnlDP8KlDrgKI7NcIO13wImXrbOrZvZco0OHgzhu1HqBk4WjpGvGoinvkAkMvu4ld9Eo9XToW3jdDZAum+sOnyo70a/SwwTj54IR+bKMcj8pXQ4ohbLLL5dVQC9lLG0PiQypDHTZEETVqw07GsVh4RdwzEv3Ct21f4MJKpkzXHZdy743W1bwE293rSsCdqfozaqoBrC2JPax0vp4YjKgRB8ComlapsgdwTJ7oz2+SQUBnrIsFqisnv773aiekqh5i4SQuf6JohhgfQezhtmUOWPpkQI+KRnMeYXVQS7mL0= 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 2312592c4076b..8dfbf3630cec2 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" @@ -320,6 +321,19 @@ 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)); -- 2.54.0.545.g6539524ca2-goog