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 8724F3C060B; Tue, 28 Apr 2026 23:25:20 +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=1777418720; cv=none; b=MYHKwgMFrBgIN+y+T0lLeo12EgEvKQCM+SA0Rk9COzVl+lfRkZe+SfrXD4qCRRvQrgrGD/l4z9LdCqGeAmWjZviK3dgEMOgsEQOsfN5bSPZqMjnZWZTbfw72Kq33/j7iF8cCK9dz38NPWoUL7LNfbjf9sfJ9y2msRFvZ8GeJecE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777418720; c=relaxed/simple; bh=9d08KMUaeq0JwnPQVzadWhlNCrfVvqp26fVJSl//L24=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=NTCwNNjh+BHQUsLEKEhTfxEQ0cL47UgrQXvGpcu4IEso+mTAs4jwvfAiWydi4DMf3YZRUWmwc8f2yveTxPLip97FXDTx1RS2CfQPDZ2mxM5yeoyXTk+sxR4KRiGWRQrJG9rcTMZr2b0iEanynZgCaL0/d6uedGz1uSOBj1iomtw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Nk0SOiwP; 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="Nk0SOiwP" Received: by smtp.kernel.org (Postfix) with ESMTPS id 681A4C2BCB7; Tue, 28 Apr 2026 23:25:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777418720; bh=9d08KMUaeq0JwnPQVzadWhlNCrfVvqp26fVJSl//L24=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=Nk0SOiwP8dVt93Vx7geCUuDFtG/Ot6FF9mRvq15Ufcm+AqdkyfXe8VaXQmYrILxZe npvr2Vml3+8rLlo0+v+FT6JTeti31hB53c/EeixK13kXfFXDJPgUhtbjbcNrqvItWs xr8eCkmTs+qjUt71lxfULBhR0qotU0zklUgaXORvG8GpAp8vh3O7qGM0WLpyMozmDR cdmS5DFr+Fts/vvPTVWgplRy1hJcAn2DWsu4uHq40I/jPCMiiwZ4d9RnbyZ37xV6Ja Nu9xsUAI/pA9v4oxlPLgaupIxvq//TLB4oc7LJRwtE2JUX1uU0RUGleq489OjsfIX6 +npw8SHJRrP1Q== 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 5D8B9FF887E; Tue, 28 Apr 2026 23:25:20 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Tue, 28 Apr 2026 16:25:33 -0700 Subject: [PATCH RFC v5 38/53] KVM: selftests: Convert with allocated folios in different layouts Precedence: bulk X-Mailing-List: linux-trace-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: <20260428-gmem-inplace-conversion-v5-38-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=2272; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=pf9NAC8k9OqEq5nwWVMZcJrfB1uS9zn83YJxtzZTu78=; b=CUCvrnQOlfUsZcPml9jjAvIchu4UtLbbdCH6GMthqWb/FfPeIaOgkJQhZfmyUQk33deZAT0/w ka64QhgQOAtB8HaovxxkYYVEWHifg8tBH6pTrCJoZ7rhmY1o7fesM4Y 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 guest_memfd selftest to verify that memory conversions work correctly with allocated folios in different layouts. By iterating through which pages are initially faulted, the test covers various layouts of contiguous allocated and unallocated regions, exercising conversion with different range layouts. Signed-off-by: Ackerley Tng Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson --- .../kvm/x86/guest_memfd_conversions_test.c | 31 ++++++++++++++++++++++ 1 file changed, 31 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 92b18373a17f1..2312592c4076b 100644 --- a/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c @@ -289,6 +289,37 @@ GMEM_CONVERSION_TEST_INIT_PRIVATE(before_allocation_private) test_convert_to_shared(t, 0, 0, 'A', 'B'); } +/* + * Test that when some of the folios in the conversion range are allocated, + * conversion requests are handled correctly in guest_memfd. Vary the ranges + * allocated before conversion, using test_page, to cover various layouts of + * contiguous allocated and unallocated regions. + */ +GMEM_CONVERSION_MULTIPAGE_TEST_INIT_SHARED(unallocated_folios, 8) +{ + const int second_page_to_fault = 4; + int i; + + /* + * Fault 2 of the pages to test filemap range operations except when + * test_page == second_page_to_fault. + */ + host_do_rmw(t->mem, test_page, 0, 'A'); + if (test_page != second_page_to_fault) + host_do_rmw(t->mem, second_page_to_fault, 0, 'A'); + + gmem_set_private(t->gmem_fd, 0, nr_pages * page_size, + KVM_SET_MEMORY_ATTRIBUTES2_PRESERVE); + for (i = 0; i < nr_pages; ++i) { + char expected = (i == test_page || i == second_page_to_fault) ? 'A' : 0; + + test_private(t, i, expected, 'B'); + } + + for (i = 0; i < nr_pages; ++i) + test_convert_to_shared(t, i, 'B', 'C', 'D'); +} + 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