@@ -38,3 +38,4 @@
/memslot_modification_stress_test
/set_memory_region_test
/steal_time
+/kvm_bin_form_stats
@@ -72,6 +72,7 @@ TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
TEST_GEN_PROGS_x86_64 += set_memory_region_test
TEST_GEN_PROGS_x86_64 += steal_time
+TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
@@ -81,6 +82,7 @@ TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
TEST_GEN_PROGS_aarch64 += set_memory_region_test
TEST_GEN_PROGS_aarch64 += steal_time
+TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
TEST_GEN_PROGS_s390x = s390x/memop
TEST_GEN_PROGS_s390x += s390x/resets
@@ -89,6 +91,7 @@ TEST_GEN_PROGS_s390x += demand_paging_test
TEST_GEN_PROGS_s390x += dirty_log_test
TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
TEST_GEN_PROGS_s390x += set_memory_region_test
+TEST_GEN_PROGS_s390x += kvm_bin_form_stats
TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
LIBKVM += $(LIBKVM_$(UNAME_M))
new file mode 100644
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kvm_bin_form_stats
+ *
+ * Copyright (C) 2021, Google LLC.
+ *
+ * Test for fd-based IOCTL commands for retrieving KVM statistics data in
+ * binary form. KVM_CAP_STATS_BINARY_FORM, KVM_STATS_GET_INFO,
+ * KVM_STATS_GET_NAMES and KVM_STATS_GET_DATA are checked.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+#include "asm/kvm.h"
+#include "linux/kvm.h"
+
+int main(int argc, char *argv[])
+{
+ struct kvm_stats_info stats_info = {0};
+ struct kvm_stats_names *stats_names;
+ struct kvm_stats_data *stats_data;
+ struct kvm_vm *kvm;
+ int i, ret;
+
+ kvm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
+
+ ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FORM);
+ if (ret < 0) {
+ pr_info("Binary form statistics interface is not supported!\n");
+ goto out_free_kvm;
+ }
+
+ ret = -1;
+ vm_ioctl(kvm, KVM_STATS_GET_INFO, &stats_info);
+ if (stats_info.num_stats == 0) {
+ pr_info("KVM_STATS_GET_INFO failed!\n");
+ pr_info("Or the number of stistics data is zero.\n");
+ goto out_free_kvm;
+ }
+
+ /* Allocate memory for stats name strings and value */
+ stats_names = malloc(sizeof(*stats_names) +
+ stats_info.num_stats * KVM_STATS_NAME_LEN);
+ if (!stats_names) {
+ pr_info("Memory allocation failed!\n");
+ goto out_free_kvm;
+ }
+
+ stats_data = malloc(sizeof(*stats_data) +
+ stats_info.num_stats * sizeof(__u64));
+ if (!stats_data) {
+ pr_info("Memory allocation failed!\n");
+ goto out_free_names;
+ }
+
+ /* Retrieve the name strings and data */
+ stats_names->size = stats_info.num_stats * KVM_STATS_NAME_LEN;
+ vm_ioctl(kvm, KVM_STATS_GET_NAMES, stats_names);
+
+ stats_data->size = stats_info.num_stats * sizeof(__u64);
+ vm_ioctl(kvm, KVM_STATS_GET_DATA, stats_data);
+
+ /* Display supported statistics names */
+ for (i = 0; i < (int)stats_info.num_stats; i++) {
+ char *name = (char *)stats_names->names + i * KVM_STATS_NAME_LEN;
+
+ if (strnlen(name, KVM_STATS_NAME_LEN) == 0) {
+ pr_info("Empty stats name at offset %d!\n", i);
+ goto out_free_data;
+ }
+ pr_info("%s\n", name);
+ }
+
+ ret = 0;
+out_free_data:
+ free(stats_data);
+out_free_names:
+ free(stats_names);
+out_free_kvm:
+ kvm_vm_free(kvm);
+ return ret;
+}
Check if the KVM binary form statistics works correctly and whether the statistics name strings are synced correctly with KVM internal stats data. Signed-off-by: Jing Zhang <jingzhangos@google.com> --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 3 + .../selftests/kvm/kvm_bin_form_stats.c | 89 +++++++++++++++++++ 3 files changed, 93 insertions(+) create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c