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11#include <stdio.h>
12#include <stdlib.h>
13#include <time.h>
14#include <pthread.h>
15#include <linux/bitmap.h>
16
17#include "kvm_util.h"
18#include "test_util.h"
19#include "perf_test_util.h"
20#include "guest_modes.h"
21
22
23#define TEST_HOST_LOOP_N 2UL
24
25static int nr_vcpus = 1;
26static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE;
27
28
29static u64 dirty_log_manual_caps;
30static bool host_quit;
31static int iteration;
32static int vcpu_last_completed_iteration[KVM_MAX_VCPUS];
33
34static void *vcpu_worker(void *data)
35{
36 int ret;
37 struct kvm_vm *vm = perf_test_args.vm;
38 uint64_t pages_count = 0;
39 struct kvm_run *run;
40 struct timespec start;
41 struct timespec ts_diff;
42 struct timespec total = (struct timespec){0};
43 struct timespec avg;
44 struct perf_test_vcpu_args *vcpu_args = (struct perf_test_vcpu_args *)data;
45 int vcpu_id = vcpu_args->vcpu_id;
46
47 run = vcpu_state(vm, vcpu_id);
48
49 while (!READ_ONCE(host_quit)) {
50 int current_iteration = READ_ONCE(iteration);
51
52 clock_gettime(CLOCK_MONOTONIC, &start);
53 ret = _vcpu_run(vm, vcpu_id);
54 ts_diff = timespec_elapsed(start);
55
56 TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
57 TEST_ASSERT(get_ucall(vm, vcpu_id, NULL) == UCALL_SYNC,
58 "Invalid guest sync status: exit_reason=%s\n",
59 exit_reason_str(run->exit_reason));
60
61 pr_debug("Got sync event from vCPU %d\n", vcpu_id);
62 vcpu_last_completed_iteration[vcpu_id] = current_iteration;
63 pr_debug("vCPU %d updated last completed iteration to %d\n",
64 vcpu_id, vcpu_last_completed_iteration[vcpu_id]);
65
66 if (current_iteration) {
67 pages_count += vcpu_args->pages;
68 total = timespec_add(total, ts_diff);
69 pr_debug("vCPU %d iteration %d dirty memory time: %ld.%.9lds\n",
70 vcpu_id, current_iteration, ts_diff.tv_sec,
71 ts_diff.tv_nsec);
72 } else {
73 pr_debug("vCPU %d iteration %d populate memory time: %ld.%.9lds\n",
74 vcpu_id, current_iteration, ts_diff.tv_sec,
75 ts_diff.tv_nsec);
76 }
77
78 while (current_iteration == READ_ONCE(iteration) &&
79 !READ_ONCE(host_quit)) {}
80 }
81
82 avg = timespec_div(total, vcpu_last_completed_iteration[vcpu_id]);
83 pr_debug("\nvCPU %d dirtied 0x%lx pages over %d iterations in %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
84 vcpu_id, pages_count, vcpu_last_completed_iteration[vcpu_id],
85 total.tv_sec, total.tv_nsec, avg.tv_sec, avg.tv_nsec);
86
87 return NULL;
88}
89
90struct test_params {
91 unsigned long iterations;
92 uint64_t phys_offset;
93 int wr_fract;
94 bool partition_vcpu_memory_access;
95 enum vm_mem_backing_src_type backing_src;
96 int slots;
97};
98
99static void toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable)
100{
101 int i;
102
103 for (i = 0; i < slots; i++) {
104 int slot = PERF_TEST_MEM_SLOT_INDEX + i;
105 int flags = enable ? KVM_MEM_LOG_DIRTY_PAGES : 0;
106
107 vm_mem_region_set_flags(vm, slot, flags);
108 }
109}
110
111static inline void enable_dirty_logging(struct kvm_vm *vm, int slots)
112{
113 toggle_dirty_logging(vm, slots, true);
114}
115
116static inline void disable_dirty_logging(struct kvm_vm *vm, int slots)
117{
118 toggle_dirty_logging(vm, slots, false);
119}
120
121static void get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots)
122{
123 int i;
124
125 for (i = 0; i < slots; i++) {
126 int slot = PERF_TEST_MEM_SLOT_INDEX + i;
127
128 kvm_vm_get_dirty_log(vm, slot, bitmaps[i]);
129 }
130}
131
132static void clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[],
133 int slots, uint64_t pages_per_slot)
134{
135 int i;
136
137 for (i = 0; i < slots; i++) {
138 int slot = PERF_TEST_MEM_SLOT_INDEX + i;
139
140 kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], 0, pages_per_slot);
141 }
142}
143
144static unsigned long **alloc_bitmaps(int slots, uint64_t pages_per_slot)
145{
146 unsigned long **bitmaps;
147 int i;
148
149 bitmaps = malloc(slots * sizeof(bitmaps[0]));
150 TEST_ASSERT(bitmaps, "Failed to allocate bitmaps array.");
151
152 for (i = 0; i < slots; i++) {
153 bitmaps[i] = bitmap_zalloc(pages_per_slot);
154 TEST_ASSERT(bitmaps[i], "Failed to allocate slot bitmap.");
155 }
156
157 return bitmaps;
158}
159
160static void free_bitmaps(unsigned long *bitmaps[], int slots)
161{
162 int i;
163
164 for (i = 0; i < slots; i++)
165 free(bitmaps[i]);
166
167 free(bitmaps);
168}
169
170static void run_test(enum vm_guest_mode mode, void *arg)
171{
172 struct test_params *p = arg;
173 pthread_t *vcpu_threads;
174 struct kvm_vm *vm;
175 unsigned long **bitmaps;
176 uint64_t guest_num_pages;
177 uint64_t host_num_pages;
178 uint64_t pages_per_slot;
179 int vcpu_id;
180 struct timespec start;
181 struct timespec ts_diff;
182 struct timespec get_dirty_log_total = (struct timespec){0};
183 struct timespec vcpu_dirty_total = (struct timespec){0};
184 struct timespec avg;
185 struct kvm_enable_cap cap = {};
186 struct timespec clear_dirty_log_total = (struct timespec){0};
187
188 vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size,
189 p->slots, p->backing_src);
190
191 perf_test_args.wr_fract = p->wr_fract;
192
193 guest_num_pages = (nr_vcpus * guest_percpu_mem_size) >> vm_get_page_shift(vm);
194 guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages);
195 host_num_pages = vm_num_host_pages(mode, guest_num_pages);
196 pages_per_slot = host_num_pages / p->slots;
197
198 bitmaps = alloc_bitmaps(p->slots, pages_per_slot);
199
200 if (dirty_log_manual_caps) {
201 cap.cap = KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2;
202 cap.args[0] = dirty_log_manual_caps;
203 vm_enable_cap(vm, &cap);
204 }
205
206 vcpu_threads = malloc(nr_vcpus * sizeof(*vcpu_threads));
207 TEST_ASSERT(vcpu_threads, "Memory allocation failed");
208
209 perf_test_setup_vcpus(vm, nr_vcpus, guest_percpu_mem_size,
210 p->partition_vcpu_memory_access);
211
212 sync_global_to_guest(vm, perf_test_args);
213
214
215 iteration = 0;
216 host_quit = false;
217
218 clock_gettime(CLOCK_MONOTONIC, &start);
219 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
220 vcpu_last_completed_iteration[vcpu_id] = -1;
221
222 pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker,
223 &perf_test_args.vcpu_args[vcpu_id]);
224 }
225
226
227 pr_debug("Starting iteration %d - Populating\n", iteration);
228 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
229 while (READ_ONCE(vcpu_last_completed_iteration[vcpu_id]) !=
230 iteration)
231 ;
232 }
233
234 ts_diff = timespec_elapsed(start);
235 pr_info("Populate memory time: %ld.%.9lds\n",
236 ts_diff.tv_sec, ts_diff.tv_nsec);
237
238
239 clock_gettime(CLOCK_MONOTONIC, &start);
240 enable_dirty_logging(vm, p->slots);
241 ts_diff = timespec_elapsed(start);
242 pr_info("Enabling dirty logging time: %ld.%.9lds\n\n",
243 ts_diff.tv_sec, ts_diff.tv_nsec);
244
245 while (iteration < p->iterations) {
246
247
248
249
250 clock_gettime(CLOCK_MONOTONIC, &start);
251 iteration++;
252
253 pr_debug("Starting iteration %d\n", iteration);
254 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
255 while (READ_ONCE(vcpu_last_completed_iteration[vcpu_id])
256 != iteration)
257 ;
258 }
259
260 ts_diff = timespec_elapsed(start);
261 vcpu_dirty_total = timespec_add(vcpu_dirty_total, ts_diff);
262 pr_info("Iteration %d dirty memory time: %ld.%.9lds\n",
263 iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
264
265 clock_gettime(CLOCK_MONOTONIC, &start);
266 get_dirty_log(vm, bitmaps, p->slots);
267 ts_diff = timespec_elapsed(start);
268 get_dirty_log_total = timespec_add(get_dirty_log_total,
269 ts_diff);
270 pr_info("Iteration %d get dirty log time: %ld.%.9lds\n",
271 iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
272
273 if (dirty_log_manual_caps) {
274 clock_gettime(CLOCK_MONOTONIC, &start);
275 clear_dirty_log(vm, bitmaps, p->slots, pages_per_slot);
276 ts_diff = timespec_elapsed(start);
277 clear_dirty_log_total = timespec_add(clear_dirty_log_total,
278 ts_diff);
279 pr_info("Iteration %d clear dirty log time: %ld.%.9lds\n",
280 iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
281 }
282 }
283
284
285 clock_gettime(CLOCK_MONOTONIC, &start);
286 disable_dirty_logging(vm, p->slots);
287 ts_diff = timespec_elapsed(start);
288 pr_info("Disabling dirty logging time: %ld.%.9lds\n",
289 ts_diff.tv_sec, ts_diff.tv_nsec);
290
291
292 host_quit = true;
293 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
294 pthread_join(vcpu_threads[vcpu_id], NULL);
295
296 avg = timespec_div(get_dirty_log_total, p->iterations);
297 pr_info("Get dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
298 p->iterations, get_dirty_log_total.tv_sec,
299 get_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec);
300
301 if (dirty_log_manual_caps) {
302 avg = timespec_div(clear_dirty_log_total, p->iterations);
303 pr_info("Clear dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
304 p->iterations, clear_dirty_log_total.tv_sec,
305 clear_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec);
306 }
307
308 free_bitmaps(bitmaps, p->slots);
309 free(vcpu_threads);
310 perf_test_destroy_vm(vm);
311}
312
313static void help(char *name)
314{
315 puts("");
316 printf("usage: %s [-h] [-i iterations] [-p offset] "
317 "[-m mode] [-b vcpu bytes] [-v vcpus] [-o] [-s mem type]"
318 "[-x memslots]\n", name);
319 puts("");
320 printf(" -i: specify iteration counts (default: %"PRIu64")\n",
321 TEST_HOST_LOOP_N);
322 printf(" -p: specify guest physical test memory offset\n"
323 " Warning: a low offset can conflict with the loaded test code.\n");
324 guest_modes_help();
325 printf(" -b: specify the size of the memory region which should be\n"
326 " dirtied by each vCPU. e.g. 10M or 3G.\n"
327 " (default: 1G)\n");
328 printf(" -f: specify the fraction of pages which should be written to\n"
329 " as opposed to simply read, in the form\n"
330 " 1/<fraction of pages to write>.\n"
331 " (default: 1 i.e. all pages are written to.)\n");
332 printf(" -v: specify the number of vCPUs to run.\n");
333 printf(" -o: Overlap guest memory accesses instead of partitioning\n"
334 " them into a separate region of memory for each vCPU.\n");
335 backing_src_help("-s");
336 printf(" -x: Split the memory region into this number of memslots.\n"
337 " (default: 1)\n");
338 puts("");
339 exit(0);
340}
341
342int main(int argc, char *argv[])
343{
344 int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);
345 struct test_params p = {
346 .iterations = TEST_HOST_LOOP_N,
347 .wr_fract = 1,
348 .partition_vcpu_memory_access = true,
349 .backing_src = DEFAULT_VM_MEM_SRC,
350 .slots = 1,
351 };
352 int opt;
353
354 dirty_log_manual_caps =
355 kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
356 dirty_log_manual_caps &= (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE |
357 KVM_DIRTY_LOG_INITIALLY_SET);
358
359 guest_modes_append_default();
360
361 while ((opt = getopt(argc, argv, "hi:p:m:b:f:v:os:x:")) != -1) {
362 switch (opt) {
363 case 'i':
364 p.iterations = atoi(optarg);
365 break;
366 case 'p':
367 p.phys_offset = strtoull(optarg, NULL, 0);
368 break;
369 case 'm':
370 guest_modes_cmdline(optarg);
371 break;
372 case 'b':
373 guest_percpu_mem_size = parse_size(optarg);
374 break;
375 case 'f':
376 p.wr_fract = atoi(optarg);
377 TEST_ASSERT(p.wr_fract >= 1,
378 "Write fraction cannot be less than one");
379 break;
380 case 'v':
381 nr_vcpus = atoi(optarg);
382 TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
383 "Invalid number of vcpus, must be between 1 and %d", max_vcpus);
384 break;
385 case 'o':
386 p.partition_vcpu_memory_access = false;
387 break;
388 case 's':
389 p.backing_src = parse_backing_src_type(optarg);
390 break;
391 case 'x':
392 p.slots = atoi(optarg);
393 break;
394 case 'h':
395 default:
396 help(argv[0]);
397 break;
398 }
399 }
400
401 TEST_ASSERT(p.iterations >= 2, "The test should have at least two iterations");
402
403 pr_info("Test iterations: %"PRIu64"\n", p.iterations);
404
405 for_each_guest_mode(run_test, &p);
406
407 return 0;
408}
409
