From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C810B315793; Sat, 23 May 2026 00:18:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779495486; cv=none; b=bX/DQfICqZKHNNDD5KmzSV4VtR6eOH29fyHW3wWOjAEQv9wyZqKlqnZ7rxr+K9QRzatm0Sq+fwSWxfuTlUnpeU/Upz+P+cWu2KG5ty+nA+5QZStYbAcbry7CfBvovGJmivWh+zgeRtV0orvKeV34gfFhhpdvpdCF2CchZN5zp84= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779495486; c=relaxed/simple; bh=crDRVHQ3NuTmHMnr4j9stjQP4V8d/t6F5lEXauI4gZE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=oXIPNWaGHisMn4CBy7QlRnp/7Q3/N6efxAcEg3cyUEqF2/6e3cDs+tHTwRU0lL980REgyxmvda7QVjfiHCxnkv+sBPGvgHojGiJhPHY6C/21jVDq8IAv5XEq+5ha6VDImz6PydV2XxLDA9V16xoJG/VRwpyOL9eP3O2kUbXC2uQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Kxi66ujW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Kxi66ujW" Received: by smtp.kernel.org (Postfix) with ESMTPS id 20C0BC4DE18; Sat, 23 May 2026 00:18:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1779495486; bh=crDRVHQ3NuTmHMnr4j9stjQP4V8d/t6F5lEXauI4gZE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=Kxi66ujWf084q+zbKopuMWkp32EBEllWV9e+zByWiK0qTQMcCnzMIxQghbuQitRQ5 0WcvVTsX/NcxERBzLOgZ+nMRKW3oZd5luCKNe4H51gSu+GmxytsETNkRVu0zQuPVUg rhLGFG7oGIfFGu1zfzoXesv23VBS8ePitYaaBVCMOiCfgJ0rQcpaDAk0d6GaAfTQUb 9GJ5BISSuQJIuGlhpE4FzB89faK1gcprOADXk0e4x1pqsTp61UqdvS6kESzRHfQukI k4Tdf9vvaetlqlAxs6pXfOhil4RMTZsSBd4ntbu8fmzkxL91GjJybk/Q0Z4q8GQSzo CNUYwz/Au5kqw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FEEACD5BB0; Sat, 23 May 2026 00:18:06 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 22 May 2026 17:18:14 -0700 Subject: [PATCH v7 32/42] KVM: selftests: Test that truncation does not change shared/private status Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260522-gmem-inplace-conversion-v7-32-2f0fae496530@google.com> References: <20260522-gmem-inplace-conversion-v7-0-2f0fae496530@google.com> In-Reply-To: <20260522-gmem-inplace-conversion-v7-0-2f0fae496530@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=1779495480; l=1978; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=A0YqugQfWPs0cOb11Bo7pPkLbTJzlslWehe07ov/pus=; b=UNxP24AJ1RXTn6uTmRSP6gbZsxB/QRdwgEcS+Aru87hawxU92UxaxUVqesNNFUrEU88+aZuVm CEG/atzrgvPCRHtqeIUYAQlyH07b7Sz4z/7jIPri7linmtNAeNlXc1n 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 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 0b024fb7227f0..f03af2c46426f 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)); -- 2.54.0.794.g4f17f83d09-goog