From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 04735C5AD2B for ; Fri, 7 Aug 2026 21:55:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 00C7A6B00E3; Fri, 7 Aug 2026 17:53:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EF8956B00E5; Fri, 7 Aug 2026 17:53:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DBFCA6B00E6; Fri, 7 Aug 2026 17:53:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id AA3C86B00E3 for ; Fri, 7 Aug 2026 17:53:05 -0400 (EDT) Received: from smtpin25.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 36DAD1601DC for ; Fri, 7 Aug 2026 21:53:05 +0000 (UTC) X-FDA: 85075824330.25.A57A263 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf01.hostedemail.com (Postfix) with ESMTP id 37B2F40003 for ; Fri, 7 Aug 2026 21:53:03 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="C/uXXcJT"; spf=pass (imf01.hostedemail.com: domain of devnull+ackerleytng.google.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+ackerleytng.google.com@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1786139583; b=rMm/PKgp0j4/L2cqPgSOVTEvqegtmgbP9QCxxN2yF5L8aAchkWIw3hDr9KKkdLxN7W1gGV vygRCaFcUOfRbpRK3GbNyu/XX78SwvAoPFXfJbMK/H6TZOgcvAIzkPrWuNTVcCABVJzPkC haMfijySfUok0htIemLCiNkpJti5Dfw= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="C/uXXcJT"; spf=pass (imf01.hostedemail.com: domain of devnull+ackerleytng.google.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+ackerleytng.google.com@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1786139583; h=from:from:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=YPQlSPqj0b2U40ONQPE4BKKxCul0TCpfz1uWLrVTPYo=; b=xQX3ukcPAIQdRXtqvG+O9zvURuwgSqsscpMxoWpwMFHtskZkuj6plT4mHfhVwFR3Xx5U2h SgmI5eVN+kYo7s8p5Rymh95QqlK6JhCgf/e7V2Bxr6sOKk4fO7UVz/aeDCq61jGvxv+6dt eoHH57uZlU72kvPptk2GVLeDMm/EIm8= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 29D4644F71; Fri, 7 Aug 2026 21:52:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id E0BB9C2BCC7; Fri, 7 Aug 2026 21:52:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1786139571; bh=oiCZ15D+JnnSDHZXHJ5SlW01WMugZzVHBK5KAb/ZX6s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=C/uXXcJTcbnMACVfng5rwXU3HeoIRTD79pAMiPUuSq7lRPyEE6FFhjCpsV+YHGO8L 5PIJXUY3a5K26ztv6MdTjrGKXnLqBYbJB4FRFVKoA8g9CY+/yLtJm0sWtefn4yRQ64 VqCRGm7XjmvGK/NNk+Qih9MnitSbm0GpxDoT1g4UcUp88XAkG59p4J8uW77E19dMsq kk9zy9DbmvyHneQw4nhR2he17K8oBs6dXtouaN4oHRSVkSiV8dBsEWGC9I5jr1Ietn 7VZAbnI65b26y1Oq3Kyu83XcsxhiYriSwzjdsWopjU4bIwz3Z6uKB8sOThCod8Ubqk hbHdn5aB6M2vg== 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 CBAB8C5ACD3; Fri, 7 Aug 2026 21:52:50 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Fri, 07 Aug 2026 14:53:11 -0700 Subject: [PATCH v10 32/41] KVM: selftests: Test that truncation does not change shared/private status MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260807-gmem-inplace-conversion-v10-32-2fc18ee6d3ba@google.com> References: <20260807-gmem-inplace-conversion-v10-0-2fc18ee6d3ba@google.com> In-Reply-To: <20260807-gmem-inplace-conversion-v10-0-2fc18ee6d3ba@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, 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 , 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, Jason Gunthorpe , 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=1786139565; l=2066; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=XnrrGORPSG8J5b5Yy/zf/neukgQrtYTrJSAta0tG4eE=; b=dXcTGNf6P61ZUtYXmAhmz6sqd3ry79tRyeA1zpGJGdnTisGO6IFhUDrktN98U1VNcfEgBStuj Uy3aUtM/QxdAt5XSp/kGzwFm7+XJeSjDq9ym+JWPxai/LrpuBDi+HQ6 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: rspam12 X-Rspamd-Queue-Id: 37B2F40003 X-Stat-Signature: 459afcw14aw3k1eo79xwpgkjk1q5fi1k X-Rspam-User: X-HE-Tag: 1786139583-105498 X-HE-Meta: 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 6oQBzY54 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 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)); -- 2.55.0.654.g21b8a5bc05-goog