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 4DCF83CA48C; Thu, 10 Sep 2026 23:55:40 +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=1789084540; cv=none; b=X8D17TiT0+7Y8M93Uxl04muOtXAsVUWhjCUox3YT/SObJHtdww/xie+lJaa9mZ/bNBJiNRxmndgr3Bc1mHNUlyYw1BONw30VQGWR1dFposJumFnCiRLFyRKIlVWKh9H7kzFrZ14ZGexMPgonnXD3aTKNEO6CBsGKBl9I8+t3eSU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789084540; c=relaxed/simple; bh=KQzuPdV1gWiuydTuD7xSiqB1zTFyM8IyKkBCWN/jlTY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QUba6K0nXQEsz+oyL/+h8xipWSlB7VYOZUkfPkAuHD8Z3Y8FihD9TtQNYUiRRW6AA/Kum3Ec6E8sAcaOFJ9p5IDcL2/lWTHuG6kN+CLio9tZeVXJ2fK0ZLtzruPL5K+W3syts5YSZ5IEHeeXE6YaKmC10dlNrs2lIfFQEudD3G0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IFAbnsQg; 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="IFAbnsQg" Received: by smtp.kernel.org (Postfix) with ESMTPS id 19F4FC2BCC7; Thu, 10 Sep 2026 23:55:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1789084540; bh=KQzuPdV1gWiuydTuD7xSiqB1zTFyM8IyKkBCWN/jlTY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=IFAbnsQgAsVFUA0W6qddZlOeTAQOrgc5bt6IiYbQS1x65mOXfTGOb1Cs28C0KytSR yCxdoaoDNMKuBnalFI3f0s290Xsn7ccHjaVDWgUW5n+M7ARTHkk/nNAoDXXCeKs07W MfT2b5/vTKJzZbzmscR+sqEL5qFJWKUbdckCrUeSRreWHw3EKrdpX/Y/J0FMn6MCgf CwiUdU/t+NoAjQOLbelURt/Ry8lmY0s/RdLKVjGZDLQfCmSZjh1Awo4GKL/157E4Mo Uem3+22+MsrSK2OsgIJZXIyRL+CjO4fvzB6FT2w3iMt9HOrLG5x+IWd8jYqcve3ryv SFrEh1jvYxMCg== 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 038E5C88E45; Thu, 10 Sep 2026 23:55:40 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Thu, 10 Sep 2026 16:55:59 -0700 Subject: [PATCH v13 33/44] KVM: selftests: Convert with allocated folios in different layouts Precedence: bulk X-Mailing-List: kvm@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: <20260910-gmem-inplace-conversion-v13-33-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=2318; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=i4zR9cZX+AbRAkXfOcfeA5ccOiga6jFKGQu/7pejXYI=; b=SxFA5hyVQ67SAlo6+V3QXivJzESo+7dwV1dHjgvb91bD0tOOJnwaykK7t5Zp+elcO2NesofCF Cjo4KZQuec3AjiLwaF29Vuy2o1GDav1yY2iJQAXIcHsvpbAEdkynekL 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. Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson Signed-off-by: Ackerley Tng Tested-by: Shivank Garg Reviewed-by: Fuad Tabba --- .../kvm/x86/guest_memfd_conversions_test.c | 30 ++++++++++++++++++++++ 1 file changed, 30 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 f46f1530a94b9..acdff2d154046 100644 --- a/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/x86/guest_memfd_conversions_test.c @@ -282,6 +282,36 @@ 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); + 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)); -- 2.55.0.1007.g17ff1f9808-goog