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// SPDX-License-Identifier: GPL-2.0-only
/*
* kvm_binary_stats_test
*
* Copyright (C) 2021, Google LLC.
*
* Test the fd-based interface for KVM statistics.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "test_util.h"
#include "kvm_util.h"
#include "asm/kvm.h"
#include "linux/kvm.h"
static void stats_test(int stats_fd)
{
ssize_t ret;
int i;
size_t size_desc;
size_t size_data = 0;
struct kvm_stats_header *header;
char *id;
struct kvm_stats_desc *stats_desc;
u64 *stats_data;
struct kvm_stats_desc *pdesc;
/* Read kvm stats header */
header = malloc(sizeof(*header));
TEST_ASSERT(header, "Allocate memory for stats header");
ret = read(stats_fd, header, sizeof(*header));
TEST_ASSERT(ret == sizeof(*header), "Read stats header");
size_desc = sizeof(*stats_desc) + header->name_size;
/* Read kvm stats id string */
id = malloc(header->name_size);
TEST_ASSERT(id, "Allocate memory for id string");
ret = read(stats_fd, id, header->name_size);
TEST_ASSERT(ret == header->name_size, "Read id string");
/* Check id string, that should start with "kvm" */
TEST_ASSERT(!strncmp(id, "kvm", 3) && strlen(id) < header->name_size,
"Invalid KVM stats type, id: %s", id);
/* Sanity check for other fields in header */
if (header->num_desc == 0) {
printf("No KVM stats defined!");
return;
}
/* Check overlap */
TEST_ASSERT(header->desc_offset > 0 && header->data_offset > 0
&& header->desc_offset >= sizeof(*header)
&& header->data_offset >= sizeof(*header),
"Invalid offset fields in header");
TEST_ASSERT(header->desc_offset > header->data_offset ||
(header->desc_offset + size_desc * header->num_desc <=
header->data_offset),
"Descriptor block is overlapped with data block");
/* Allocate memory for stats descriptors */
stats_desc = calloc(header->num_desc, size_desc);
TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
/* Read kvm stats descriptors */
ret = pread(stats_fd, stats_desc,
size_desc * header->num_desc, header->desc_offset);
TEST_ASSERT(ret == size_desc * header->num_desc,
"Read KVM stats descriptors");
/* Sanity check for fields in descriptors */
for (i = 0; i < header->num_desc; ++i) {
pdesc = (void *)stats_desc + i * size_desc;
/* Check type,unit,base boundaries */
TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
/* Check exponent for stats unit
* Exponent for counter should be greater than or equal to 0
* Exponent for unit bytes should be greater than or equal to 0
* Exponent for unit seconds should be less than or equal to 0
* Exponent for unit clock cycles should be greater than or
* equal to 0
*/
switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
case KVM_STATS_UNIT_NONE:
case KVM_STATS_UNIT_BYTES:
case KVM_STATS_UNIT_CYCLES:
TEST_ASSERT(pdesc->exponent >= 0,
"Unsupported KVM stats unit");
break;
case KVM_STATS_UNIT_SECONDS:
TEST_ASSERT(pdesc->exponent <= 0,
"Unsupported KVM stats unit");
break;
}
/* Check name string */
TEST_ASSERT(strlen(pdesc->name) < header->name_size,
"KVM stats name(%s) too long", pdesc->name);
/* Check size field, which should not be zero */
TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
pdesc->name);
/* Check bucket_size field */
switch (pdesc->flags & KVM_STATS_TYPE_MASK) {
case KVM_STATS_TYPE_LINEAR_HIST:
TEST_ASSERT(pdesc->bucket_size,
"Bucket size of Linear Histogram stats (%s) is zero",
pdesc->name);
break;
default:
TEST_ASSERT(!pdesc->bucket_size,
"Bucket size of stats (%s) is not zero",
pdesc->name);
}
size_data += pdesc->size * sizeof(*stats_data);
}
/* Check overlap */
TEST_ASSERT(header->data_offset >= header->desc_offset
|| header->data_offset + size_data <= header->desc_offset,
"Data block is overlapped with Descriptor block");
/* Check validity of all stats data size */
TEST_ASSERT(size_data >= header->num_desc * sizeof(*stats_data),
"Data size is not correct");
/* Check stats offset */
for (i = 0; i < header->num_desc; ++i) {
pdesc = (void *)stats_desc + i * size_desc;
TEST_ASSERT(pdesc->offset < size_data,
"Invalid offset (%u) for stats: %s",
pdesc->offset, pdesc->name);
}
/* Allocate memory for stats data */
stats_data = malloc(size_data);
TEST_ASSERT(stats_data, "Allocate memory for stats data");
/* Read kvm stats data as a bulk */
ret = pread(stats_fd, stats_data, size_data, header->data_offset);
TEST_ASSERT(ret == size_data, "Read KVM stats data");
/* Read kvm stats data one by one */
size_data = 0;
for (i = 0; i < header->num_desc; ++i) {
pdesc = (void *)stats_desc + i * size_desc;
ret = pread(stats_fd, stats_data,
pdesc->size * sizeof(*stats_data),
header->data_offset + size_data);
TEST_ASSERT(ret == pdesc->size * sizeof(*stats_data),
"Read data of KVM stats: %s", pdesc->name);
size_data += pdesc->size * sizeof(*stats_data);
}
free(stats_data);
free(stats_desc);
free(id);
free(header);
}
static void vm_stats_test(struct kvm_vm *vm)
{
int stats_fd;
/* Get fd for VM stats */
stats_fd = vm_get_stats_fd(vm);
TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
stats_test(stats_fd);
close(stats_fd);
TEST_ASSERT(fcntl(stats_fd, F_GETFD) == -1, "Stats fd not freed");
}
static void vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
{
int stats_fd;
/* Get fd for VCPU stats */
stats_fd = vcpu_get_stats_fd(vm, vcpu_id);
TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
stats_test(stats_fd);
close(stats_fd);
TEST_ASSERT(fcntl(stats_fd, F_GETFD) == -1, "Stats fd not freed");
}
#define DEFAULT_NUM_VM 4
#define DEFAULT_NUM_VCPU 4
/*
* Usage: kvm_bin_form_stats [#vm] [#vcpu]
* The first parameter #vm set the number of VMs being created.
* The second parameter #vcpu set the number of VCPUs being created.
* By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
* created for testing.
*/
int main(int argc, char *argv[])
{
int i, j;
struct kvm_vm **vms;
int max_vm = DEFAULT_NUM_VM;
int max_vcpu = DEFAULT_NUM_VCPU;
/* Get the number of VMs and VCPUs that would be created for testing. */
if (argc > 1) {
max_vm = strtol(argv[1], NULL, 0);
if (max_vm <= 0)
max_vm = DEFAULT_NUM_VM;
}
if (argc > 2) {
max_vcpu = strtol(argv[2], NULL, 0);
if (max_vcpu <= 0)
max_vcpu = DEFAULT_NUM_VCPU;
}
/* Check the extension for binary stats */
if (kvm_check_cap(KVM_CAP_BINARY_STATS_FD) <= 0) {
print_skip("Binary form statistics interface is not supported");
exit(KSFT_SKIP);
}
/* Create VMs and VCPUs */
vms = malloc(sizeof(vms[0]) * max_vm);
TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
for (i = 0; i < max_vm; ++i) {
vms[i] = vm_create(VM_MODE_DEFAULT,
DEFAULT_GUEST_PHY_PAGES, O_RDWR);
for (j = 0; j < max_vcpu; ++j)
vm_vcpu_add(vms[i], j);
}
/* Check stats read for every VM and VCPU */
for (i = 0; i < max_vm; ++i) {
vm_stats_test(vms[i]);
for (j = 0; j < max_vcpu; ++j)
vcpu_stats_test(vms[i], j);
}
for (i = 0; i < max_vm; ++i)
kvm_vm_free(vms[i]);
free(vms);
return 0;
}
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