linux-kernel - [RFC PATCH v2 13/51] KVM: selftests: Add script to exercise private_mem_conversions

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Message-ID: <c4d4dcd297dea1eeded3f0c195f4a9767fe9c120.1747264138.git.ackerleytng@google.com>
Date: Wed, 14 May 2025 16:41:52 -0700
From: Ackerley Tng <ackerleytng@...gle.com>
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	x86@...nel.org, linux-fsdevel@...r.kernel.org
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Subject: [RFC PATCH v2 13/51] KVM: selftests: Add script to exercise private_mem_conversions_test

Makes testing different combinations of private_mem_conversions_test
flags easier.

Change-Id: I7647e92524baf09eb97e09bdbd95ad57ada44f4b
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 .../kvm/x86/private_mem_conversions_test.sh   | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100755 tools/testing/selftests/kvm/x86/private_mem_conversions_test.sh

diff --git a/tools/testing/selftests/kvm/x86/private_mem_conversions_test.sh b/tools/testing/selftests/kvm/x86/private_mem_conversions_test.sh
new file mode 100755
index 000000000000..76efa81114d2
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86/private_mem_conversions_test.sh
@@ -0,0 +1,82 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only */
+#
+# Wrapper script which runs different test setups of
+# private_mem_conversions_test.
+#
+# Copyright (C) 2024, Google LLC.
+
+set -e
+
+num_vcpus_to_test=4
+num_memslots_to_test=$num_vcpus_to_test
+
+get_default_hugepage_size_in_kB() {
+	grep "Hugepagesize:" /proc/meminfo | grep -o '[[:digit:]]\+'
+}
+
+# Required pages are based on the test setup (see computation for memfd_size) in
+# test_mem_conversions() in private_mem_migrate_tests.c)
+
+# These static requirements are set to the maximum required for
+# num_vcpus_to_test, over all the hugetlb-related tests
+required_num_2m_hugepages=$(( 1024 * num_vcpus_to_test ))
+required_num_1g_hugepages=$(( 2 * num_vcpus_to_test ))
+
+# The other hugetlb sizes are not supported on x86_64
+[ "$(cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages 2>/dev/null || echo 0)" \
+  -ge "$required_num_2m_hugepages" ] && hugepage_2mb_enabled=1
+[ "$(cat /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages 2>/dev/null || echo 0)" \
+  -ge "$required_num_1g_hugepages" ] && hugepage_1gb_enabled=1
+
+case $(get_default_hugepage_size_in_kB) in
+	2048)
+		hugepage_default_enabled=$hugepage_2mb_enabled
+		;;
+	1048576)
+		hugepage_default_enabled=$hugepage_1gb_enabled
+		;;
+	*)
+		hugepage_default_enabled=0
+		;;
+esac
+
+backing_src_types=( anonymous )
+backing_src_types+=( anonymous_thp )
+[ -n "$hugepage_default_enabled" ] && \
+	backing_src_types+=( anonymous_hugetlb ) || \
+	echo "skipping anonymous_hugetlb backing source type"
+[ -n "$hugepage_2mb_enabled" ] && \
+	backing_src_types+=( anonymous_hugetlb_2mb ) || \
+	echo "skipping anonymous_hugetlb_2mb backing source type"
+[ -n "$hugepage_1gb_enabled" ] && \
+	backing_src_types+=( anonymous_hugetlb_1gb ) || \
+	echo "skipping anonymous_hugetlb_1gb backing source type"
+backing_src_types+=( shmem )
+[ -n "$hugepage_default_enabled" ] && \
+	backing_src_types+=( shared_hugetlb ) || \
+	echo "skipping shared_hugetlb backing source type"
+
+set +e
+
+TEST_EXECUTABLE="$(dirname "$0")/private_mem_conversions_test"
+
+(
+	set -e
+
+	for src_type in "${backing_src_types[@]}"; do
+
+		set -x
+
+                $TEST_EXECUTABLE -s "$src_type" -n $num_vcpus_to_test
+		$TEST_EXECUTABLE -s "$src_type" -n $num_vcpus_to_test -m $num_memslots_to_test
+
+		{ set +x; } 2>/dev/null
+
+		echo
+
+	done
+)
+RET=$?
+
+exit $RET
-- 
2.49.0.1045.g170613ef41-goog