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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 vcpu_args_set(vm, vcpu_id, 1, vcpu_id);
49 run = vcpu_state(vm, vcpu_id);
50
51
52 while (READ_ONCE(run_vcpus)) {
53 ret = _vcpu_run(vm, vcpu_id);
54 TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
55
56 if (get_ucall(vm, vcpu_id, NULL) == UCALL_SYNC)
57 continue;
58
59 TEST_ASSERT(false,
60 "Invalid guest sync status: exit_reason=%s\n",
61 exit_reason_str(run->exit_reason));
62 }
63
64 return NULL;
65}
66
67struct memslot_antagonist_args {
68 struct kvm_vm *vm;
69 useconds_t delay;
70 uint64_t nr_modifications;
71};
72
73static void add_remove_memslot(struct kvm_vm *vm, useconds_t delay,
74 uint64_t nr_modifications)
75{
76 const uint64_t pages = 1;
77 uint64_t gpa;
78 int i;
79
80
81
82
83
84 gpa = guest_test_phys_mem - pages * vm_get_page_size(vm);
85
86 for (i = 0; i < nr_modifications; i++) {
87 usleep(delay);
88 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, gpa,
89 DUMMY_MEMSLOT_INDEX, pages, 0);
90
91 vm_mem_region_delete(vm, DUMMY_MEMSLOT_INDEX);
92 }
93}
94
95struct test_params {
96 useconds_t memslot_modification_delay;
97 uint64_t nr_memslot_modifications;
98 bool partition_vcpu_memory_access;
99};
100
101static void run_test(enum vm_guest_mode mode, void *arg)
102{
103 struct test_params *p = arg;
104 pthread_t *vcpu_threads;
105 struct kvm_vm *vm;
106 int vcpu_id;
107
108 vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size,
109 VM_MEM_SRC_ANONYMOUS);
110
111 perf_test_args.wr_fract = 1;
112
113 vcpu_threads = malloc(nr_vcpus * sizeof(*vcpu_threads));
114 TEST_ASSERT(vcpu_threads, "Memory allocation failed");
115
116 perf_test_setup_vcpus(vm, nr_vcpus, guest_percpu_mem_size,
117 p->partition_vcpu_memory_access);
118
119
120 sync_global_to_guest(vm, perf_test_args);
121
122 pr_info("Finished creating vCPUs\n");
123
124 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
125 pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker,
126 &perf_test_args.vcpu_args[vcpu_id]);
127
128 pr_info("Started all vCPUs\n");
129
130 add_remove_memslot(vm, p->memslot_modification_delay,
131 p->nr_memslot_modifications);
132
133 run_vcpus = false;
134
135
136 for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
137 pthread_join(vcpu_threads[vcpu_id], NULL);
138
139 pr_info("All vCPU threads joined\n");
140
141 ucall_uninit(vm);
142 kvm_vm_free(vm);
143
144 free(vcpu_threads);
145}
146
147static void help(char *name)
148{
149 puts("");
150 printf("usage: %s [-h] [-m mode] [-d delay_usec]\n"
151 " [-b memory] [-v vcpus] [-o] [-i iterations]\n", name);
152 guest_modes_help();
153 printf(" -d: add a delay between each iteration of adding and\n"
154 " deleting a memslot in usec.\n");
155 printf(" -b: specify the size of the memory region which should be\n"
156 " accessed by each vCPU. e.g. 10M or 3G.\n"
157 " Default: 1G\n");
158 printf(" -v: specify the number of vCPUs to run.\n");
159 printf(" -o: Overlap guest memory accesses instead of partitioning\n"
160 " them into a separate region of memory for each vCPU.\n");
161 printf(" -i: specify the number of iterations of adding and removing\n"
162 " a memslot.\n"
163 " Default: %d\n", DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS);
164 puts("");
165 exit(0);
166}
167
168int main(int argc, char *argv[])
169{
170 int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);
171 int opt;
172 struct test_params p = {
173 .memslot_modification_delay = 0,
174 .nr_memslot_modifications =
175 DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS,
176 .partition_vcpu_memory_access = true
177 };
178
179 guest_modes_append_default();
180
181 while ((opt = getopt(argc, argv, "hm:d:b:v:oi:")) != -1) {
182 switch (opt) {
183 case 'm':
184 guest_modes_cmdline(optarg);
185 break;
186 case 'd':
187 p.memslot_modification_delay = strtoul(optarg, NULL, 0);
188 TEST_ASSERT(p.memslot_modification_delay >= 0,
189 "A negative delay is not supported.");
190 break;
191 case 'b':
192 guest_percpu_mem_size = parse_size(optarg);
193 break;
194 case 'v':
195 nr_vcpus = atoi(optarg);
196 TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
197 "Invalid number of vcpus, must be between 1 and %d",
198 max_vcpus);
199 break;
200 case 'o':
201 p.partition_vcpu_memory_access = false;
202 break;
203 case 'i':
204 p.nr_memslot_modifications = atoi(optarg);
205 break;
206 case 'h':
207 default:
208 help(argv[0]);
209 break;
210 }
211 }
212
213 for_each_guest_mode(run_test, &p);
214
215 return 0;
216}
217
