1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * svm_vmcall_test 4 * 5 * Copyright © 2021 Amazon.com, Inc. or its affiliates. 6 * 7 * Xen shared_info / pvclock testing 8 */ 9 10 #include "test_util.h" 11 #include "kvm_util.h" 12 #include "processor.h" 13 14 #include <stdint.h> 15 #include <time.h> 16 #include <sched.h> 17 #include <sys/syscall.h> 18 19 #define VCPU_ID 5 20 21 #define SHINFO_REGION_GVA 0xc0000000ULL 22 #define SHINFO_REGION_GPA 0xc0000000ULL 23 #define SHINFO_REGION_SLOT 10 24 #define PAGE_SIZE 4096 25 26 #define PVTIME_ADDR (SHINFO_REGION_GPA + PAGE_SIZE) 27 #define RUNSTATE_ADDR (SHINFO_REGION_GPA + PAGE_SIZE + 0x20) 28 29 #define RUNSTATE_VADDR (SHINFO_REGION_GVA + PAGE_SIZE + 0x20) 30 31 static struct kvm_vm *vm; 32 33 #define XEN_HYPERCALL_MSR 0x40000000 34 35 #define MIN_STEAL_TIME 50000 36 37 struct pvclock_vcpu_time_info { 38 u32 version; 39 u32 pad0; 40 u64 tsc_timestamp; 41 u64 system_time; 42 u32 tsc_to_system_mul; 43 s8 tsc_shift; 44 u8 flags; 45 u8 pad[2]; 46 } __attribute__((__packed__)); /* 32 bytes */ 47 48 struct pvclock_wall_clock { 49 u32 version; 50 u32 sec; 51 u32 nsec; 52 } __attribute__((__packed__)); 53 54 struct vcpu_runstate_info { 55 uint32_t state; 56 uint64_t state_entry_time; 57 uint64_t time[4]; 58 }; 59 60 #define RUNSTATE_running 0 61 #define RUNSTATE_runnable 1 62 #define RUNSTATE_blocked 2 63 #define RUNSTATE_offline 3 64 65 static void guest_code(void) 66 { 67 struct vcpu_runstate_info *rs = (void *)RUNSTATE_VADDR; 68 69 /* Test having the host set runstates manually */ 70 GUEST_SYNC(RUNSTATE_runnable); 71 GUEST_ASSERT(rs->time[RUNSTATE_runnable] != 0); 72 GUEST_ASSERT(rs->state == 0); 73 74 GUEST_SYNC(RUNSTATE_blocked); 75 GUEST_ASSERT(rs->time[RUNSTATE_blocked] != 0); 76 GUEST_ASSERT(rs->state == 0); 77 78 GUEST_SYNC(RUNSTATE_offline); 79 GUEST_ASSERT(rs->time[RUNSTATE_offline] != 0); 80 GUEST_ASSERT(rs->state == 0); 81 82 /* Test runstate time adjust */ 83 GUEST_SYNC(4); 84 GUEST_ASSERT(rs->time[RUNSTATE_blocked] == 0x5a); 85 GUEST_ASSERT(rs->time[RUNSTATE_offline] == 0x6b6b); 86 87 /* Test runstate time set */ 88 GUEST_SYNC(5); 89 GUEST_ASSERT(rs->state_entry_time >= 0x8000); 90 GUEST_ASSERT(rs->time[RUNSTATE_runnable] == 0); 91 GUEST_ASSERT(rs->time[RUNSTATE_blocked] == 0x6b6b); 92 GUEST_ASSERT(rs->time[RUNSTATE_offline] == 0x5a); 93 94 /* sched_yield() should result in some 'runnable' time */ 95 GUEST_SYNC(6); 96 GUEST_ASSERT(rs->time[RUNSTATE_runnable] >= MIN_STEAL_TIME); 97 98 GUEST_DONE(); 99 } 100 101 static long get_run_delay(void) 102 { 103 char path[64]; 104 long val[2]; 105 FILE *fp; 106 107 sprintf(path, "/proc/%ld/schedstat", syscall(SYS_gettid)); 108 fp = fopen(path, "r"); 109 fscanf(fp, "%ld %ld ", &val[0], &val[1]); 110 fclose(fp); 111 112 return val[1]; 113 } 114 115 static int cmp_timespec(struct timespec *a, struct timespec *b) 116 { 117 if (a->tv_sec > b->tv_sec) 118 return 1; 119 else if (a->tv_sec < b->tv_sec) 120 return -1; 121 else if (a->tv_nsec > b->tv_nsec) 122 return 1; 123 else if (a->tv_nsec < b->tv_nsec) 124 return -1; 125 else 126 return 0; 127 } 128 129 int main(int argc, char *argv[]) 130 { 131 struct timespec min_ts, max_ts, vm_ts; 132 133 int xen_caps = kvm_check_cap(KVM_CAP_XEN_HVM); 134 if (!(xen_caps & KVM_XEN_HVM_CONFIG_SHARED_INFO) ) { 135 print_skip("KVM_XEN_HVM_CONFIG_SHARED_INFO not available"); 136 exit(KSFT_SKIP); 137 } 138 139 bool do_runstate_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE); 140 141 clock_gettime(CLOCK_REALTIME, &min_ts); 142 143 vm = vm_create_default(VCPU_ID, 0, (void *) guest_code); 144 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); 145 146 /* Map a region for the shared_info page */ 147 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 148 SHINFO_REGION_GPA, SHINFO_REGION_SLOT, 2, 0); 149 virt_map(vm, SHINFO_REGION_GVA, SHINFO_REGION_GPA, 2, 0); 150 151 struct kvm_xen_hvm_config hvmc = { 152 .flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL, 153 .msr = XEN_HYPERCALL_MSR, 154 }; 155 vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc); 156 157 struct kvm_xen_hvm_attr lm = { 158 .type = KVM_XEN_ATTR_TYPE_LONG_MODE, 159 .u.long_mode = 1, 160 }; 161 vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm); 162 163 struct kvm_xen_hvm_attr ha = { 164 .type = KVM_XEN_ATTR_TYPE_SHARED_INFO, 165 .u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE, 166 }; 167 vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ha); 168 169 struct kvm_xen_vcpu_attr vi = { 170 .type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO, 171 .u.gpa = SHINFO_REGION_GPA + 0x40, 172 }; 173 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &vi); 174 175 struct kvm_xen_vcpu_attr pvclock = { 176 .type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO, 177 .u.gpa = PVTIME_ADDR, 178 }; 179 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &pvclock); 180 181 if (do_runstate_tests) { 182 struct kvm_xen_vcpu_attr st = { 183 .type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR, 184 .u.gpa = RUNSTATE_ADDR, 185 }; 186 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &st); 187 } 188 189 struct vcpu_runstate_info *rs = addr_gpa2hva(vm, RUNSTATE_ADDR); 190 rs->state = 0x5a; 191 192 for (;;) { 193 volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID); 194 struct ucall uc; 195 196 vcpu_run(vm, VCPU_ID); 197 198 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 199 "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n", 200 run->exit_reason, 201 exit_reason_str(run->exit_reason)); 202 203 switch (get_ucall(vm, VCPU_ID, &uc)) { 204 case UCALL_ABORT: 205 TEST_FAIL("%s", (const char *)uc.args[0]); 206 /* NOT REACHED */ 207 case UCALL_SYNC: { 208 struct kvm_xen_vcpu_attr rst; 209 long rundelay; 210 211 /* If no runstate support, bail out early */ 212 if (!do_runstate_tests) 213 goto done; 214 215 TEST_ASSERT(rs->state_entry_time == rs->time[0] + 216 rs->time[1] + rs->time[2] + rs->time[3], 217 "runstate times don't add up"); 218 219 switch (uc.args[1]) { 220 case RUNSTATE_running...RUNSTATE_offline: 221 rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT; 222 rst.u.runstate.state = uc.args[1]; 223 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &rst); 224 break; 225 case 4: 226 rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST; 227 memset(&rst.u, 0, sizeof(rst.u)); 228 rst.u.runstate.state = (uint64_t)-1; 229 rst.u.runstate.time_blocked = 230 0x5a - rs->time[RUNSTATE_blocked]; 231 rst.u.runstate.time_offline = 232 0x6b6b - rs->time[RUNSTATE_offline]; 233 rst.u.runstate.time_runnable = -rst.u.runstate.time_blocked - 234 rst.u.runstate.time_offline; 235 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &rst); 236 break; 237 238 case 5: 239 rst.type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA; 240 memset(&rst.u, 0, sizeof(rst.u)); 241 rst.u.runstate.state = RUNSTATE_running; 242 rst.u.runstate.state_entry_time = 0x6b6b + 0x5a; 243 rst.u.runstate.time_blocked = 0x6b6b; 244 rst.u.runstate.time_offline = 0x5a; 245 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &rst); 246 break; 247 case 6: 248 /* Yield until scheduler delay exceeds target */ 249 rundelay = get_run_delay() + MIN_STEAL_TIME; 250 do { 251 sched_yield(); 252 } while (get_run_delay() < rundelay); 253 break; 254 } 255 break; 256 } 257 case UCALL_DONE: 258 goto done; 259 default: 260 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd); 261 } 262 } 263 264 done: 265 clock_gettime(CLOCK_REALTIME, &max_ts); 266 267 /* 268 * Just a *really* basic check that things are being put in the 269 * right place. The actual calculations are much the same for 270 * Xen as they are for the KVM variants, so no need to check. 271 */ 272 struct pvclock_wall_clock *wc; 273 struct pvclock_vcpu_time_info *ti, *ti2; 274 275 wc = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0xc00); 276 ti = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0x40 + 0x20); 277 ti2 = addr_gpa2hva(vm, PVTIME_ADDR); 278 279 vm_ts.tv_sec = wc->sec; 280 vm_ts.tv_nsec = wc->nsec; 281 TEST_ASSERT(wc->version && !(wc->version & 1), 282 "Bad wallclock version %x", wc->version); 283 TEST_ASSERT(cmp_timespec(&min_ts, &vm_ts) <= 0, "VM time too old"); 284 TEST_ASSERT(cmp_timespec(&max_ts, &vm_ts) >= 0, "VM time too new"); 285 286 TEST_ASSERT(ti->version && !(ti->version & 1), 287 "Bad time_info version %x", ti->version); 288 TEST_ASSERT(ti2->version && !(ti2->version & 1), 289 "Bad time_info version %x", ti->version); 290 291 if (do_runstate_tests) { 292 /* 293 * Fetch runstate and check sanity. Strictly speaking in the 294 * general case we might not expect the numbers to be identical 295 * but in this case we know we aren't running the vCPU any more. 296 */ 297 struct kvm_xen_vcpu_attr rst = { 298 .type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA, 299 }; 300 vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_GET_ATTR, &rst); 301 302 TEST_ASSERT(rs->state == rst.u.runstate.state, "Runstate mismatch"); 303 TEST_ASSERT(rs->state_entry_time == rst.u.runstate.state_entry_time, 304 "State entry time mismatch"); 305 TEST_ASSERT(rs->time[RUNSTATE_running] == rst.u.runstate.time_running, 306 "Running time mismatch"); 307 TEST_ASSERT(rs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable, 308 "Runnable time mismatch"); 309 TEST_ASSERT(rs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked, 310 "Blocked time mismatch"); 311 TEST_ASSERT(rs->time[RUNSTATE_offline] == rst.u.runstate.time_offline, 312 "Offline time mismatch"); 313 314 TEST_ASSERT(rs->state_entry_time == rs->time[0] + 315 rs->time[1] + rs->time[2] + rs->time[3], 316 "runstate times don't add up"); 317 } 318 kvm_vm_free(vm); 319 return 0; 320 } 321