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10#define _GNU_SOURCE
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <sys/syscall.h>
15#include <unistd.h>
16#include <asm/unistd.h>
17#include <time.h>
18#include <poll.h>
19#include <pthread.h>
20#include <linux/bitmap.h>
21#include <linux/bitops.h>
22#include <linux/userfaultfd.h>
23
24#include "perf_test_util.h"
25#include "processor.h"
26#include "test_util.h"
27#include "guest_modes.h"
28
29#define DUMMY_MEMSLOT_INDEX 7
30
31#define DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS 10
32
33
34static int nr_vcpus = 1;
35static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE;
36
37static bool run_vcpus = true;
38
39static void *vcpu_worker(void *data)
40{
41 int ret;
42 struct perf_test_vcpu_args *vcpu_args =
43 (struct perf_test_vcpu_args *)data;
44 int vcpu_id = vcpu_args->vcpu_id;
45 struct kvm_vm *vm = perf_test_args.vm;
46 struct kvm_run *run;
47
48 run = vcpu_state(vm, vcpu_id);
49
50
51 while (READ_ONCE(run_vcpus)) {
52 ret = _vcpu_run(vm, vcpu_id);
53 TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
54
55 if (get_ucall(vm, vcpu_id, NULL) == UCALL_SYNC)
56 continue;
57
58 TEST_ASSERT(false,
59 "Invalid guest sync status: exit_reason=%s\n",
60 exit_reason_str(run->exit_reason));
61 }
62
63 return NULL;
64}
65
66struct memslot_antagonist_args {
67 struct kvm_vm *vm;
68 useconds_t delay;
69 uint64_t nr_modifications;
70};
71
72static void add_remove_memslot(struct kvm_vm *vm, useconds_t delay,
73 uint64_t nr_modifications)
74{
75 const uint64_t pages = 1;
76 uint64_t gpa;
77 int i;
78
79
80
81
82
83 gpa = guest_test_phys_mem - pages * vm_get_page_size(vm);
84
85 for (i = 0; i < nr_modifications; i++) {
86 usleep(delay);
87 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, gpa,
88 DUMMY_MEMSLOT_INDEX, pages, 0);
89
90 vm_mem_region_delete(vm, DUMMY_MEMSLOT_INDEX);
91 }
92}
93
94struct test_params {
95 useconds_t memslot_modification_delay;
96 uint64_t nr_memslot_modifications;
97 bool partition_vcpu_memory_access;
98};
99
100static void run_test(enum vm_guest_mode mode, void *arg)
101{
102 struct test_params *p = arg;
103 pthread_t *vcpu_threads;
104 struct kvm_vm *vm;
105 int vcpu_id;
106
107 vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size, 1,
108 VM_MEM_SRC_ANONYMOUS);
109
110 perf_test_args.wr_fract = 1;
111
112 vcpu_threads = malloc(nr_vcpus * sizeof(*vcpu_threads));
113 TEST_ASSERT(vcpu_threads, "Memory allocation failed");
114
115 perf_test_setup_vcpus(vm, nr_vcpus, guest_percpu_mem_size,
116 p->partition_vcpu_memory_access);
117
118
119 sync_global_to_guest(vm, perf_test_args);
120
121 pr_info("Finished creating vCPUs\n");
122
123 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
124 pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker,
125 &perf_test_args.vcpu_args[vcpu_id]);
126
127 pr_info("Started all vCPUs\n");
128
129 add_remove_memslot(vm, p->memslot_modification_delay,
130 p->nr_memslot_modifications);
131
132 run_vcpus = false;
133
134
135 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
136 pthread_join(vcpu_threads[vcpu_id], NULL);
137
138 pr_info("All vCPU threads joined\n");
139
140 ucall_uninit(vm);
141 kvm_vm_free(vm);
142
143 free(vcpu_threads);
144}
145
146static void help(char *name)
147{
148 puts("");
149 printf("usage: %s [-h] [-m mode] [-d delay_usec]\n"
150 " [-b memory] [-v vcpus] [-o] [-i iterations]\n", name);
151 guest_modes_help();
152 printf(" -d: add a delay between each iteration of adding and\n"
153 " deleting a memslot in usec.\n");
154 printf(" -b: specify the size of the memory region which should be\n"
155 " accessed by each vCPU. e.g. 10M or 3G.\n"
156 " Default: 1G\n");
157 printf(" -v: specify the number of vCPUs to run.\n");
158 printf(" -o: Overlap guest memory accesses instead of partitioning\n"
159 " them into a separate region of memory for each vCPU.\n");
160 printf(" -i: specify the number of iterations of adding and removing\n"
161 " a memslot.\n"
162 " Default: %d\n", DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS);
163 puts("");
164 exit(0);
165}
166
167int main(int argc, char *argv[])
168{
169 int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);
170 int opt;
171 struct test_params p = {
172 .memslot_modification_delay = 0,
173 .nr_memslot_modifications =
174 DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS,
175 .partition_vcpu_memory_access = true
176 };
177
178 guest_modes_append_default();
179
180 while ((opt = getopt(argc, argv, "hm:d:b:v:oi:")) != -1) {
181 switch (opt) {
182 case 'm':
183 guest_modes_cmdline(optarg);
184 break;
185 case 'd':
186 p.memslot_modification_delay = strtoul(optarg, NULL, 0);
187 TEST_ASSERT(p.memslot_modification_delay >= 0,
188 "A negative delay is not supported.");
189 break;
190 case 'b':
191 guest_percpu_mem_size = parse_size(optarg);
192 break;
193 case 'v':
194 nr_vcpus = atoi(optarg);
195 TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
196 "Invalid number of vcpus, must be between 1 and %d",
197 max_vcpus);
198 break;
199 case 'o':
200 p.partition_vcpu_memory_access = false;
201 break;
202 case 'i':
203 p.nr_memslot_modifications = atoi(optarg);
204 break;
205 case 'h':
206 default:
207 help(argv[0]);
208 break;
209 }
210 }
211
212 for_each_guest_mode(run_test, &p);
213
214 return 0;
215}
216
