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AJvYcCV3UyqcUtiAUSELESlCnFAGt3mrm3GgFSPaROVOTaY9XUXQUzZunbPmP4tCcsnNsB+UZT/V/HlGOXR82Ro=@vger.kernel.org X-Gm-Message-State: AOJu0Yz7YpKaaT4JnxIyOw0J/ZS1YxP3Up98htEOOqLHDv7wcFoRRrIj CC9LOKY2sXe3K18l7YOVjD063lLW9+eONLeI/RVAWJ0GkHhdMplH1DdIzvMzRMYDg/1kNoc8gII eLnJkv+pBnnDG8jfOegdc7jixUw== X-Received: from pfbfm13.prod.google.com ([2002:a05:6a00:2f8d:b0:829:9230:5ae0]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:4507:b0:824:b03f:2f65 with SMTP id d2e1a72fcca58-82c86327803mr2544703b3a.7.1774563950966; Thu, 26 Mar 2026 15:25:50 -0700 (PDT) Date: Thu, 26 Mar 2026 15:24:51 -0700 In-Reply-To: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Developer-Signature: v=1; a=ed25519-sha256; t=1774563861; l=7309; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=1UdkhOs2Zqea3da/lUF30fB7TjQvN3BF4p6nSKOEiMw=; b=meNvl6H7hNe8vhcHr6NLmKIGogD5I73dTRdM0T0sz1m8FYD72Qb0slyTw8HDNsQ1XuejDyVCT q28EwvSh0emB3EOo8KZcCpFTHjegPcgqXIoPGnFsgPbAJ9DfeA1BI4h X-Mailer: b4 0.14.3 Message-ID: <20260326-gmem-inplace-conversion-v4-42-e202fe950ffd@google.com> Subject: [PATCH RFC v4 42/44] KVM: selftests: Add script to exercise private_mem_conversions_test From: Ackerley Tng 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, jroedel@suse.de, 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 , 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, Ackerley Tng Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Add a wrapper script to simplify running the private_mem_conversions_test with a variety of configurations. Manually invoking the test for all supported memory backing source types is tedious. The script automatically detects the availability of 2MB and 1GB hugepages and builds a list of source types to test. It then iterates through the list, running the test for each type with both a single memslot and multiple memslots. This makes it easier to get comprehensive test coverage across different memory configurations. Add and use a helper program in C to be able to read KVM_CAP_GUEST_MEMFD_MEMORY_ATTRIBUTES as defined in header files and then issue the ioctl to read the KVM CAP. Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/Makefile.kvm | 4 + .../selftests/kvm/kvm_has_gmem_attributes.c | 17 +++ .../kvm/x86/private_mem_conversions_test.sh | 128 +++++++++++++++++= ++++ 3 files changed, 149 insertions(+) diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selft= ests/kvm/Makefile.kvm index 0e2a9adfca57e..c326aecfeebb0 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -54,6 +54,7 @@ LIBKVM_loongarch +=3D lib/loongarch/exception.S =20 # Non-compiled test targets TEST_PROGS_x86 +=3D x86/nx_huge_pages_test.sh +TEST_PROGS_x86 +=3D x86/private_mem_conversions_test.sh =20 # Compiled test targets valid on all architectures with libkvm support TEST_GEN_PROGS_COMMON =3D demand_paging_test @@ -65,6 +66,8 @@ TEST_GEN_PROGS_COMMON +=3D kvm_create_max_vcpus TEST_GEN_PROGS_COMMON +=3D kvm_page_table_test TEST_GEN_PROGS_COMMON +=3D set_memory_region_test =20 +TEST_GEN_PROGS_EXTENDED_COMMON +=3D kvm_has_gmem_attributes + # Compiled test targets TEST_GEN_PROGS_x86 =3D $(TEST_GEN_PROGS_COMMON) TEST_GEN_PROGS_x86 +=3D x86/cpuid_test @@ -242,6 +245,7 @@ SPLIT_TESTS +=3D get-reg-list =20 TEST_PROGS +=3D $(TEST_PROGS_$(ARCH)) TEST_GEN_PROGS +=3D $(TEST_GEN_PROGS_$(ARCH)) +TEST_GEN_PROGS_EXTENDED +=3D $(TEST_GEN_PROGS_EXTENDED_COMMON) TEST_GEN_PROGS_EXTENDED +=3D $(TEST_GEN_PROGS_EXTENDED_$(ARCH)) LIBKVM +=3D $(LIBKVM_$(ARCH)) =20 diff --git a/tools/testing/selftests/kvm/kvm_has_gmem_attributes.c b/tools/= testing/selftests/kvm/kvm_has_gmem_attributes.c new file mode 100644 index 0000000000000..4f361349412fb --- /dev/null +++ b/tools/testing/selftests/kvm/kvm_has_gmem_attributes.c @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Utility to check if KVM supports guest_memfd attributes. + * + * Copyright (C) 2025, Google LLC. + */ + +#include + +#include "kvm_util.h" + +int main(void) +{ + printf("%u\n", kvm_check_cap(KVM_CAP_GUEST_MEMFD_MEMORY_ATTRIBUTES) > 0); + + return 0; +} diff --git a/tools/testing/selftests/kvm/x86/private_mem_conversions_test.s= h b/tools/testing/selftests/kvm/x86/private_mem_conversions_test.sh new file mode 100755 index 0000000000000..7179a4fcdd498 --- /dev/null +++ b/tools/testing/selftests/kvm/x86/private_mem_conversions_test.sh @@ -0,0 +1,128 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only +# +# Wrapper script which runs different test setups of +# private_mem_conversions_test. +# +# Copyright (C) 2025, Google LLC. + +NUM_VCPUS_TO_TEST=3D4 +NUM_MEMSLOTS_TO_TEST=3D$NUM_VCPUS_TO_TEST + +# Required pages are based on the test setup in the C code. +REQUIRED_NUM_2M_HUGEPAGES=3D$((1024 * NUM_VCPUS_TO_TEST)) +REQUIRED_NUM_1G_HUGEPAGES=3D$((2 * NUM_VCPUS_TO_TEST)) + +get_hugepage_count() { + local page_size_kb=3D$1 + local path=3D"/sys/kernel/mm/hugepages/hugepages-${page_size_kb}kB/nr_= hugepages" + if [ -f "$path" ]; then + cat "$path" + else + echo 0 + fi +} + +get_default_hugepage_size_in_kb() { + local size=3D$(grep "Hugepagesize:" /proc/meminfo | awk '{print $2}') + echo "$size" +} + +run_tests() { + local executable_path=3D$1 + local src_type=3D$2 + local num_memslots=3D$3 + local num_vcpus=3D$4 + + echo "$executable_path -s $src_type -m $num_memslots -n $num_vcpus" + "$executable_path" -s "$src_type" -m "$num_memslots" -n "$num_vcpus" +} + +script_dir=3D$(dirname "$(realpath "$0")") +test_executable=3D"${script_dir}/private_mem_conversions_test" +kvm_has_gmem_attributes_tool=3D"${script_dir}/../kvm_has_gmem_attributes" + +if [ ! -f "$test_executable" ]; then + echo "Error: Test executable not found at '$test_executable'" >&2 + exit 1 +fi + +if [ ! -f "$kvm_has_gmem_attributes_tool" ]; then + echo "Error: kvm_has_gmem_attributes utility not found at '$kvm_has_gm= em_attributes_tool'" >&2 + exit 1 +fi + +kvm_has_gmem_attributes=3D$("$kvm_has_gmem_attributes_tool" | tail -n1) + +if [ "$kvm_has_gmem_attributes" -eq 1 ]; then + backing_src_types=3D("shmem") +else + hugepage_2mb_count=3D$(get_hugepage_count 2048) + hugepage_2mb_enabled=3D$((hugepage_2mb_count >=3D REQUIRED_NUM_2M_HUGE= PAGES)) + hugepage_1gb_count=3D$(get_hugepage_count 1048576) + hugepage_1gb_enabled=3D$((hugepage_1gb_count >=3D REQUIRED_NUM_1G_HUGE= PAGES)) + + default_hugepage_size_kb=3D$(get_default_hugepage_size_in_kb) + hugepage_default_enabled=3D0 + if [ "$default_hugepage_size_kb" -eq 2048 ]; then + hugepage_default_enabled=3D$hugepage_2mb_enabled + elif [ "$default_hugepage_size_kb" -eq 1048576 ]; then + hugepage_default_enabled=3D$hugepage_1gb_enabled + fi + + backing_src_types=3D("anonymous" "anonymous_thp") + + if [ "$hugepage_default_enabled" -eq 1 ]; then + backing_src_types+=3D("anonymous_hugetlb") + else + echo "skipping anonymous_hugetlb backing source type" + fi + + if [ "$hugepage_2mb_enabled" -eq 1 ]; then + backing_src_types+=3D("anonymous_hugetlb_2mb") + else + echo "skipping anonymous_hugetlb_2mb backing source type" + fi + + if [ "$hugepage_1gb_enabled" -eq 1 ]; then + backing_src_types+=3D("anonymous_hugetlb_1gb") + else + echo "skipping anonymous_hugetlb_1gb backing source type" + fi + + backing_src_types+=3D("shmem") + + if [ "$hugepage_default_enabled" -eq 1 ]; then + backing_src_types+=3D("shared_hugetlb") + else + echo "skipping shared_hugetlb backing source type" + fi +fi + +return_code=3D0 +for i in "${!backing_src_types[@]}"; do + src_type=3D${backing_src_types[$i]} + if [ "$i" -gt 0 ]; then + echo + fi + + if ! run_tests "$test_executable" "$src_type" 1 1; then + return_code=3D$? + echo "Test failed for source type '$src_type'. Arguments: -s $src_= type -m 1 -n 1" >&2 + break + fi + + if ! run_tests "$test_executable" "$src_type" 1 "$NUM_VCPUS_TO_TEST"; = then + return_code=3D$? + echo "Test failed for source type '$src_type'. Arguments: -s $src_= type -m 1 -n $NUM_VCPUS_TO_TEST" >&2 + break + fi + + if ! run_tests "$test_executable" "$src_type" "$NUM_MEMSLOTS_TO_TEST" = "$NUM_VCPUS_TO_TEST"; then + return_code=3D$? + echo "Test failed for source type '$src_type'. Arguments: -s $src_= type -m $NUM_MEMSLOTS_TO_TEST -n $NUM_VCPUS_TO_TEST" >&2 + break + fi +done + +exit "$return_code" --=20 2.53.0.1018.g2bb0e51243-goog