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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260910-gmem-inplace-conversion-v13-34-dd6fbf94f4e1@google.com> References: <20260910-gmem-inplace-conversion-v13-0-dd6fbf94f4e1@google.com> In-Reply-To: <20260910-gmem-inplace-conversion-v13-0-dd6fbf94f4e1@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, 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, 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=1789084533; l=2067; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=d5eJ++IcGJazUQlXjFIkV06g9Z71l71yIBb6tdneXIQ=; b=CCElrqX7WC07ExlLLucnumRJXtfcIFU5A0IFsjwOodS95cWs8AaEL3dO9LwUCG0xZAVvPANHu nCEsakHy2uFDjJUuYbdZTTBOC2Q3vwdX0IF5ERAVZ6iqrBWmoYFqggf 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-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: DE51614000A X-Stat-Signature: suuh3sgfin3gic81tegy6586yb13o1u6 X-Rspam-User: X-HE-Tag: 1789084551-643609 X-HE-Meta: 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 gMi8+34S s4X/KmxWWO3KP8FVFNibBpE+OYbP0uC7RoJErBEbyWLCpzQwusxxP4lms4xmTD1AotXTfifZdKWES3cKvbygeAO1QWxTwNcE81qr6pT20dh4H0aIOxUSRLLddxhrhck2BwLeON4LP+L5KSqOAeJ62bIPBgHHsl0xP5cTPqnL+JaRJG2kvk0P52gmKIGtifLzngWuy+GC1fT8rbW+m49PJiv/b+djVVnYl5wSBCaRdUnGs3IWChYqBumv1wAEjcJAfAXPYiJQAvN3FWmWOoKosDhkpaa9VeRP0+ZWoXe2oMRm/XYq8MHff75LDZ4XaNNuH/MjLs3FpubIgJzOB4YH5+T+Z9ua60CReXaLo4nEfmqchbrg4p3G5TQ3C0Me7pqx2XPrTZ3S1db6CBP6MJ9Cg/2cJLSwOi3tcUx/Ox7uWIoAE8mXyCrGmH0y463uEP2dnBx0WiMA9UB/RTczhKlEmjEmlUDI2YiUsnxrE 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 Signed-off-by: Ackerley Tng Tested-by: Shivank Garg Reviewed-by: Fuad Tabba --- .../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)); -- 2.55.0.1007.g17ff1f9808-goog