1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * kvm_binary_stats_test 4 * 5 * Copyright (C) 2021, Google LLC. 6 * 7 * Test the fd-based interface for KVM statistics. 8 */ 9 10 #define _GNU_SOURCE /* for program_invocation_short_name */ 11 #include <fcntl.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 #include <errno.h> 16 17 #include "test_util.h" 18 19 #include "kvm_util.h" 20 #include "asm/kvm.h" 21 #include "linux/kvm.h" 22 23 static void stats_test(int stats_fd) 24 { 25 ssize_t ret; 26 int i; 27 size_t size_desc; 28 size_t size_data = 0; 29 struct kvm_stats_header header; 30 char *id; 31 struct kvm_stats_desc *stats_desc; 32 u64 *stats_data; 33 struct kvm_stats_desc *pdesc; 34 u32 type, unit, base; 35 36 /* Read kvm stats header */ 37 read_stats_header(stats_fd, &header); 38 39 size_desc = get_stats_descriptor_size(&header); 40 41 /* Read kvm stats id string */ 42 id = malloc(header.name_size); 43 TEST_ASSERT(id, "Allocate memory for id string"); 44 45 ret = read(stats_fd, id, header.name_size); 46 TEST_ASSERT(ret == header.name_size, "Read id string"); 47 48 /* Check id string, that should start with "kvm" */ 49 TEST_ASSERT(!strncmp(id, "kvm", 3) && strlen(id) < header.name_size, 50 "Invalid KVM stats type, id: %s", id); 51 52 /* Sanity check for other fields in header */ 53 if (header.num_desc == 0) { 54 printf("No KVM stats defined!"); 55 return; 56 } 57 /* 58 * The descriptor and data offsets must be valid, they must not overlap 59 * the header, and the descriptor and data blocks must not overlap each 60 * other. Note, the data block is rechecked after its size is known. 61 */ 62 TEST_ASSERT(header.desc_offset && header.desc_offset >= sizeof(header) && 63 header.data_offset && header.data_offset >= sizeof(header), 64 "Invalid offset fields in header"); 65 66 TEST_ASSERT(header.desc_offset > header.data_offset || 67 (header.desc_offset + size_desc * header.num_desc <= header.data_offset), 68 "Descriptor block is overlapped with data block"); 69 70 /* Read kvm stats descriptors */ 71 stats_desc = read_stats_descriptors(stats_fd, &header); 72 73 /* Sanity check for fields in descriptors */ 74 for (i = 0; i < header.num_desc; ++i) { 75 pdesc = get_stats_descriptor(stats_desc, i, &header); 76 type = pdesc->flags & KVM_STATS_TYPE_MASK; 77 unit = pdesc->flags & KVM_STATS_UNIT_MASK; 78 base = pdesc->flags & KVM_STATS_BASE_MASK; 79 80 /* Check name string */ 81 TEST_ASSERT(strlen(pdesc->name) < header.name_size, 82 "KVM stats name (index: %d) too long", i); 83 84 /* Check type,unit,base boundaries */ 85 TEST_ASSERT(type <= KVM_STATS_TYPE_MAX, 86 "Unknown KVM stats (%s) type: %u", pdesc->name, type); 87 TEST_ASSERT(unit <= KVM_STATS_UNIT_MAX, 88 "Unknown KVM stats (%s) unit: %u", pdesc->name, unit); 89 TEST_ASSERT(base <= KVM_STATS_BASE_MAX, 90 "Unknown KVM stats (%s) base: %u", pdesc->name, base); 91 92 /* 93 * Check exponent for stats unit 94 * Exponent for counter should be greater than or equal to 0 95 * Exponent for unit bytes should be greater than or equal to 0 96 * Exponent for unit seconds should be less than or equal to 0 97 * Exponent for unit clock cycles should be greater than or 98 * equal to 0 99 * Exponent for unit boolean should be 0 100 */ 101 switch (pdesc->flags & KVM_STATS_UNIT_MASK) { 102 case KVM_STATS_UNIT_NONE: 103 case KVM_STATS_UNIT_BYTES: 104 case KVM_STATS_UNIT_CYCLES: 105 TEST_ASSERT(pdesc->exponent >= 0, 106 "Unsupported KVM stats (%s) exponent: %i", 107 pdesc->name, pdesc->exponent); 108 break; 109 case KVM_STATS_UNIT_SECONDS: 110 TEST_ASSERT(pdesc->exponent <= 0, 111 "Unsupported KVM stats (%s) exponent: %i", 112 pdesc->name, pdesc->exponent); 113 break; 114 case KVM_STATS_UNIT_BOOLEAN: 115 TEST_ASSERT(pdesc->exponent == 0, 116 "Unsupported KVM stats (%s) exponent: %d", 117 pdesc->name, pdesc->exponent); 118 break; 119 } 120 121 /* Check size field, which should not be zero */ 122 TEST_ASSERT(pdesc->size, 123 "KVM descriptor(%s) with size of 0", pdesc->name); 124 /* Check bucket_size field */ 125 switch (pdesc->flags & KVM_STATS_TYPE_MASK) { 126 case KVM_STATS_TYPE_LINEAR_HIST: 127 TEST_ASSERT(pdesc->bucket_size, 128 "Bucket size of Linear Histogram stats (%s) is zero", 129 pdesc->name); 130 break; 131 default: 132 TEST_ASSERT(!pdesc->bucket_size, 133 "Bucket size of stats (%s) is not zero", 134 pdesc->name); 135 } 136 size_data += pdesc->size * sizeof(*stats_data); 137 } 138 139 /* 140 * Now that the size of the data block is known, verify the data block 141 * doesn't overlap the descriptor block. 142 */ 143 TEST_ASSERT(header.data_offset >= header.desc_offset || 144 header.data_offset + size_data <= header.desc_offset, 145 "Data block is overlapped with Descriptor block"); 146 147 /* Check validity of all stats data size */ 148 TEST_ASSERT(size_data >= header.num_desc * sizeof(*stats_data), 149 "Data size is not correct"); 150 151 /* Check stats offset */ 152 for (i = 0; i < header.num_desc; ++i) { 153 pdesc = get_stats_descriptor(stats_desc, i, &header); 154 TEST_ASSERT(pdesc->offset < size_data, 155 "Invalid offset (%u) for stats: %s", 156 pdesc->offset, pdesc->name); 157 } 158 159 /* Allocate memory for stats data */ 160 stats_data = malloc(size_data); 161 TEST_ASSERT(stats_data, "Allocate memory for stats data"); 162 /* Read kvm stats data as a bulk */ 163 ret = pread(stats_fd, stats_data, size_data, header.data_offset); 164 TEST_ASSERT(ret == size_data, "Read KVM stats data"); 165 /* Read kvm stats data one by one */ 166 for (i = 0; i < header.num_desc; ++i) { 167 pdesc = get_stats_descriptor(stats_desc, i, &header); 168 read_stat_data(stats_fd, &header, pdesc, stats_data, 169 pdesc->size); 170 } 171 172 free(stats_data); 173 free(stats_desc); 174 free(id); 175 } 176 177 178 static void vm_stats_test(struct kvm_vm *vm) 179 { 180 int stats_fd = vm_get_stats_fd(vm); 181 182 stats_test(stats_fd); 183 close(stats_fd); 184 TEST_ASSERT(fcntl(stats_fd, F_GETFD) == -1, "Stats fd not freed"); 185 } 186 187 static void vcpu_stats_test(struct kvm_vcpu *vcpu) 188 { 189 int stats_fd = vcpu_get_stats_fd(vcpu); 190 191 stats_test(stats_fd); 192 close(stats_fd); 193 TEST_ASSERT(fcntl(stats_fd, F_GETFD) == -1, "Stats fd not freed"); 194 } 195 196 #define DEFAULT_NUM_VM 4 197 #define DEFAULT_NUM_VCPU 4 198 199 /* 200 * Usage: kvm_bin_form_stats [#vm] [#vcpu] 201 * The first parameter #vm set the number of VMs being created. 202 * The second parameter #vcpu set the number of VCPUs being created. 203 * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be 204 * created for testing. 205 */ 206 207 int main(int argc, char *argv[]) 208 { 209 int i, j; 210 struct kvm_vcpu **vcpus; 211 struct kvm_vm **vms; 212 int max_vm = DEFAULT_NUM_VM; 213 int max_vcpu = DEFAULT_NUM_VCPU; 214 215 /* Get the number of VMs and VCPUs that would be created for testing. */ 216 if (argc > 1) { 217 max_vm = strtol(argv[1], NULL, 0); 218 if (max_vm <= 0) 219 max_vm = DEFAULT_NUM_VM; 220 } 221 if (argc > 2) { 222 max_vcpu = strtol(argv[2], NULL, 0); 223 if (max_vcpu <= 0) 224 max_vcpu = DEFAULT_NUM_VCPU; 225 } 226 227 /* Check the extension for binary stats */ 228 TEST_REQUIRE(kvm_has_cap(KVM_CAP_BINARY_STATS_FD)); 229 230 /* Create VMs and VCPUs */ 231 vms = malloc(sizeof(vms[0]) * max_vm); 232 TEST_ASSERT(vms, "Allocate memory for storing VM pointers"); 233 234 vcpus = malloc(sizeof(struct kvm_vcpu *) * max_vm * max_vcpu); 235 TEST_ASSERT(vcpus, "Allocate memory for storing vCPU pointers"); 236 237 for (i = 0; i < max_vm; ++i) { 238 vms[i] = vm_create_barebones(); 239 for (j = 0; j < max_vcpu; ++j) 240 vcpus[i * max_vcpu + j] = __vm_vcpu_add(vms[i], j); 241 } 242 243 /* Check stats read for every VM and VCPU */ 244 for (i = 0; i < max_vm; ++i) { 245 vm_stats_test(vms[i]); 246 for (j = 0; j < max_vcpu; ++j) 247 vcpu_stats_test(vcpus[i * max_vcpu + j]); 248 } 249 250 for (i = 0; i < max_vm; ++i) 251 kvm_vm_free(vms[i]); 252 free(vms); 253 return 0; 254 } 255