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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, Randy Dunlap , Lorenzo Stoakes , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jason Gunthorpe , Fuad Tabba , Vlastimil Babka , Baoquan He 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=1788135916; l=2066; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=tNExLNWLFDn50j0RlKFtcHpdRLOf4T07FWqRSpyOYNY=; b=YUToXWIB44Po+fdLbmu0EdGYzg3DMaTns2uQZw0fL0Iq2D4zUBQHSEZYILSpCQ07agH3oEiZH gxvtPHsPUXzBhBletXy8wcGKYoBB0+IOFC/BYas0faHs9bAX/B1Cgz4 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-Server: rspam10 X-Rspamd-Queue-Id: 7C84220009 X-Stat-Signature: 1exk6ycwh1kd5r5pzpkuunk68tg4q7kw X-HE-Tag: 1788135939-19259 X-HE-Meta: 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 AWklke/7 GgXePSQmp0F193SDQDVU+BZDHvGs+AMqBXkxD8Yu5/2SzLGVTV/GcL0OwT3fzDPsIf+4OMt5COrEsSPgADfqm5tOVdtBg/dVeMKKwKTHSwiv24EbqLi9snPWFB3N0ib+lQnIJ0m2JMfjGTD6Vd3gyhh4zZcbexdduLSGd8JsifvR/O8wb1kf1qHoXoqPtoVJ6qmKvduGseU7/enrUBC0qpKvHiBu6T9VSA0iVul7tMWSUvjmXmq/yzp2yXkuQ/GFJ9qx8bDkWEtfQgDge1XCMnpyA7FXs2t7vVd47PZBq7iK0iem6BsHrVqpf83dlcGJP7pW+/55dDsDm0UwWUHQnke+abB+fWV0HXxrTCCMDR3wcZHCq/hrIehJI3lT580tbVz6YL+GJzfG8vIYm2qgF9G9OalbudNKRJOicktnHvzFWV8TSqZISAtRyv4LDwiwPZu2Al7OzpEgYO8heOABQJ+3g5mmVXLUkt0il 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. 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)); -- 2.55.0.897.gb25b4bd76c-goog