1 /* $NetBSD: h_io_assist.c,v 1.12 2020/09/05 07:22:26 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net 5 * All rights reserved. 6 * 7 * This code is part of the NVMM hypervisor. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <stdint.h> 34 #include <stdbool.h> 35 #include <unistd.h> 36 #include <string.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <sys/types.h> 40 #include <sys/mman.h> 41 #include <machine/segments.h> 42 #include <machine/psl.h> 43 #include <machine/pte.h> 44 #include <x86/specialreg.h> 45 46 #include <nvmm.h> 47 48 #define PAGE_SIZE 4096 49 #define IO_SIZE 128 50 51 static char iobuf[IO_SIZE]; 52 53 static char *databuf; 54 static uint8_t *instbuf; 55 56 static void 57 init_seg(struct nvmm_x64_state_seg *seg, int type, int sel) 58 { 59 seg->selector = sel; 60 seg->attrib.type = type; 61 seg->attrib.s = (type & 0b10000) != 0; 62 seg->attrib.dpl = 0; 63 seg->attrib.p = 1; 64 seg->attrib.avl = 1; 65 seg->attrib.l = 1; 66 seg->attrib.def = 0; 67 seg->attrib.g = 1; 68 seg->limit = 0x0000FFFF; 69 seg->base = 0x00000000; 70 } 71 72 static void 73 reset_machine(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 74 { 75 struct nvmm_x64_state *state = vcpu->state; 76 77 memset(state, 0, sizeof(*state)); 78 79 /* Default. */ 80 state->gprs[NVMM_X64_GPR_RFLAGS] = PSL_MBO; 81 init_seg(&state->segs[NVMM_X64_SEG_CS], SDT_MEMERA, GSEL(GCODE_SEL, SEL_KPL)); 82 init_seg(&state->segs[NVMM_X64_SEG_SS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 83 init_seg(&state->segs[NVMM_X64_SEG_DS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 84 init_seg(&state->segs[NVMM_X64_SEG_ES], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 85 init_seg(&state->segs[NVMM_X64_SEG_FS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 86 init_seg(&state->segs[NVMM_X64_SEG_GS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 87 88 /* Blank. */ 89 init_seg(&state->segs[NVMM_X64_SEG_GDT], 0, 0); 90 init_seg(&state->segs[NVMM_X64_SEG_IDT], 0, 0); 91 init_seg(&state->segs[NVMM_X64_SEG_LDT], SDT_SYSLDT, 0); 92 init_seg(&state->segs[NVMM_X64_SEG_TR], SDT_SYS386BSY, 0); 93 94 /* Protected mode enabled. */ 95 state->crs[NVMM_X64_CR_CR0] = CR0_PG|CR0_PE|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM; 96 97 /* 64bit mode enabled. */ 98 state->crs[NVMM_X64_CR_CR4] = CR4_PAE; 99 state->msrs[NVMM_X64_MSR_EFER] = EFER_LME | EFER_SCE | EFER_LMA; 100 101 /* Stolen from x86/pmap.c */ 102 #define PATENTRY(n, type) (type << ((n) * 8)) 103 #define PAT_UC 0x0ULL 104 #define PAT_WC 0x1ULL 105 #define PAT_WT 0x4ULL 106 #define PAT_WP 0x5ULL 107 #define PAT_WB 0x6ULL 108 #define PAT_UCMINUS 0x7ULL 109 state->msrs[NVMM_X64_MSR_PAT] = 110 PATENTRY(0, PAT_WB) | PATENTRY(1, PAT_WT) | 111 PATENTRY(2, PAT_UCMINUS) | PATENTRY(3, PAT_UC) | 112 PATENTRY(4, PAT_WB) | PATENTRY(5, PAT_WT) | 113 PATENTRY(6, PAT_UCMINUS) | PATENTRY(7, PAT_UC); 114 115 /* Page tables. */ 116 state->crs[NVMM_X64_CR_CR3] = 0x3000; 117 118 state->gprs[NVMM_X64_GPR_RIP] = 0x2000; 119 120 if (nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 121 err(errno, "nvmm_vcpu_setstate"); 122 } 123 124 static void 125 map_pages(struct nvmm_machine *mach) 126 { 127 pt_entry_t *L4, *L3, *L2, *L1; 128 int ret; 129 130 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 131 -1, 0); 132 if (instbuf == MAP_FAILED) 133 err(errno, "mmap"); 134 databuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 135 -1, 0); 136 if (databuf == MAP_FAILED) 137 err(errno, "mmap"); 138 139 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 140 err(errno, "nvmm_hva_map"); 141 if (nvmm_hva_map(mach, (uintptr_t)databuf, PAGE_SIZE) == -1) 142 err(errno, "nvmm_hva_map"); 143 ret = nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 144 PROT_READ|PROT_EXEC); 145 if (ret == -1) 146 err(errno, "nvmm_gpa_map"); 147 ret = nvmm_gpa_map(mach, (uintptr_t)databuf, 0x1000, PAGE_SIZE, 148 PROT_READ|PROT_WRITE); 149 if (ret == -1) 150 err(errno, "nvmm_gpa_map"); 151 152 L4 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 153 -1, 0); 154 if (L4 == MAP_FAILED) 155 err(errno, "mmap"); 156 L3 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 157 -1, 0); 158 if (L3 == MAP_FAILED) 159 err(errno, "mmap"); 160 L2 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 161 -1, 0); 162 if (L2 == MAP_FAILED) 163 err(errno, "mmap"); 164 L1 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 165 -1, 0); 166 if (L1 == MAP_FAILED) 167 err(errno, "mmap"); 168 169 if (nvmm_hva_map(mach, (uintptr_t)L4, PAGE_SIZE) == -1) 170 err(errno, "nvmm_hva_map"); 171 if (nvmm_hva_map(mach, (uintptr_t)L3, PAGE_SIZE) == -1) 172 err(errno, "nvmm_hva_map"); 173 if (nvmm_hva_map(mach, (uintptr_t)L2, PAGE_SIZE) == -1) 174 err(errno, "nvmm_hva_map"); 175 if (nvmm_hva_map(mach, (uintptr_t)L1, PAGE_SIZE) == -1) 176 err(errno, "nvmm_hva_map"); 177 178 ret = nvmm_gpa_map(mach, (uintptr_t)L4, 0x3000, PAGE_SIZE, 179 PROT_READ|PROT_WRITE); 180 if (ret == -1) 181 err(errno, "nvmm_gpa_map"); 182 ret = nvmm_gpa_map(mach, (uintptr_t)L3, 0x4000, PAGE_SIZE, 183 PROT_READ|PROT_WRITE); 184 if (ret == -1) 185 err(errno, "nvmm_gpa_map"); 186 ret = nvmm_gpa_map(mach, (uintptr_t)L2, 0x5000, PAGE_SIZE, 187 PROT_READ|PROT_WRITE); 188 if (ret == -1) 189 err(errno, "nvmm_gpa_map"); 190 ret = nvmm_gpa_map(mach, (uintptr_t)L1, 0x6000, PAGE_SIZE, 191 PROT_READ|PROT_WRITE); 192 if (ret == -1) 193 err(errno, "nvmm_gpa_map"); 194 195 memset(L4, 0, PAGE_SIZE); 196 memset(L3, 0, PAGE_SIZE); 197 memset(L2, 0, PAGE_SIZE); 198 memset(L1, 0, PAGE_SIZE); 199 200 L4[0] = PTE_P | PTE_W | 0x4000; 201 L3[0] = PTE_P | PTE_W | 0x5000; 202 L2[0] = PTE_P | PTE_W | 0x6000; 203 L1[0x2000 / PAGE_SIZE] = PTE_P | PTE_W | 0x2000; 204 L1[0x1000 / PAGE_SIZE] = PTE_P | PTE_W | 0x1000; 205 } 206 207 /* -------------------------------------------------------------------------- */ 208 209 static size_t iobuf_off = 0; 210 211 static void 212 io_callback(struct nvmm_io *io) 213 { 214 if (io->port != 123) { 215 printf("Wrong port\n"); 216 exit(-1); 217 } 218 219 if (io->in) { 220 memcpy(io->data, iobuf + iobuf_off, io->size); 221 } else { 222 memcpy(iobuf + iobuf_off, io->data, io->size); 223 } 224 iobuf_off += io->size; 225 226 } 227 228 static int 229 handle_io(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 230 { 231 int ret; 232 233 ret = nvmm_assist_io(mach, vcpu); 234 if (ret == -1) { 235 err(errno, "nvmm_assist_io"); 236 } 237 238 return 0; 239 } 240 241 static void 242 run_machine(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 243 { 244 struct nvmm_vcpu_exit *exit = vcpu->exit; 245 246 while (1) { 247 if (nvmm_vcpu_run(mach, vcpu) == -1) 248 err(errno, "nvmm_vcpu_run"); 249 250 switch (exit->reason) { 251 case NVMM_VCPU_EXIT_NONE: 252 break; 253 254 case NVMM_VCPU_EXIT_RDMSR: 255 /* Stop here. */ 256 return; 257 258 case NVMM_VCPU_EXIT_IO: 259 handle_io(mach, vcpu); 260 break; 261 262 case NVMM_VCPU_EXIT_SHUTDOWN: 263 printf("Shutting down!\n"); 264 return; 265 266 default: 267 printf("Invalid!\n"); 268 return; 269 } 270 } 271 } 272 273 /* -------------------------------------------------------------------------- */ 274 275 struct test { 276 const char *name; 277 uint8_t *code_begin; 278 uint8_t *code_end; 279 const char *wanted; 280 bool in; 281 }; 282 283 static void 284 run_test(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu, 285 const struct test *test) 286 { 287 size_t size; 288 char *res; 289 290 size = (size_t)test->code_end - (size_t)test->code_begin; 291 292 reset_machine(mach, vcpu); 293 294 iobuf_off = 0; 295 memset(iobuf, 0, IO_SIZE); 296 memset(databuf, 0, PAGE_SIZE); 297 memcpy(instbuf, test->code_begin, size); 298 299 if (test->in) { 300 strcpy(iobuf, test->wanted); 301 } else { 302 strcpy(databuf, test->wanted); 303 } 304 305 run_machine(mach, vcpu); 306 307 if (test->in) { 308 res = databuf; 309 } else { 310 res = iobuf; 311 } 312 313 if (!strcmp(res, test->wanted)) { 314 printf("Test '%s' passed\n", test->name); 315 } else { 316 printf("Test '%s' failed, wanted '%s', got '%s'\n", test->name, 317 test->wanted, res); 318 } 319 } 320 321 /* -------------------------------------------------------------------------- */ 322 323 extern uint8_t test1_begin, test1_end; 324 extern uint8_t test2_begin, test2_end; 325 extern uint8_t test3_begin, test3_end; 326 extern uint8_t test4_begin, test4_end; 327 extern uint8_t test5_begin, test5_end; 328 extern uint8_t test6_begin, test6_end; 329 extern uint8_t test7_begin, test7_end; 330 extern uint8_t test8_begin, test8_end; 331 extern uint8_t test9_begin, test9_end; 332 extern uint8_t test10_begin, test10_end; 333 extern uint8_t test11_begin, test11_end; 334 extern uint8_t test12_begin, test12_end; 335 336 static const struct test tests[] = { 337 { "test1 - INB", &test1_begin, &test1_end, "12", true }, 338 { "test2 - INW", &test2_begin, &test2_end, "1234", true }, 339 { "test3 - INL", &test3_begin, &test3_end, "12345678", true }, 340 { "test4 - INSB+REP", &test4_begin, &test4_end, "12345", true }, 341 { "test5 - INSW+REP", &test5_begin, &test5_end, 342 "Comment est votre blanquette", true }, 343 { "test6 - INSL+REP", &test6_begin, &test6_end, 344 "123456789abcdefghijklmnopqrs", true }, 345 { "test7 - OUTB", &test7_begin, &test7_end, "12", false }, 346 { "test8 - OUTW", &test8_begin, &test8_end, "1234", false }, 347 { "test9 - OUTL", &test9_begin, &test9_end, "12345678", false }, 348 { "test10 - OUTSB+REP", &test10_begin, &test10_end, "12345", false }, 349 { "test11 - OUTSW+REP", &test11_begin, &test11_end, 350 "Ah, Herr Bramard", false }, 351 { "test12 - OUTSL+REP", &test12_begin, &test12_end, 352 "123456789abcdefghijklmnopqrs", false }, 353 { NULL, NULL, NULL, NULL, false } 354 }; 355 356 static struct nvmm_assist_callbacks callbacks = { 357 .io = io_callback, 358 .mem = NULL 359 }; 360 361 /* 362 * 0x1000: Data, mapped 363 * 0x2000: Instructions, mapped 364 * 0x3000: L4 365 * 0x4000: L3 366 * 0x5000: L2 367 * 0x6000: L1 368 */ 369 int main(int argc, char *argv[]) 370 { 371 struct nvmm_machine mach; 372 struct nvmm_vcpu vcpu; 373 size_t i; 374 375 if (nvmm_init() == -1) 376 err(errno, "nvmm_init"); 377 if (nvmm_machine_create(&mach) == -1) 378 err(errno, "nvmm_machine_create"); 379 if (nvmm_vcpu_create(&mach, 0, &vcpu) == -1) 380 err(errno, "nvmm_vcpu_create"); 381 nvmm_vcpu_configure(&mach, &vcpu, NVMM_VCPU_CONF_CALLBACKS, &callbacks); 382 map_pages(&mach); 383 384 for (i = 0; tests[i].name != NULL; i++) { 385 run_test(&mach, &vcpu, &tests[i]); 386 } 387 388 return 0; 389 } 390
Indexes created Sun Sep 21 20:09:37 GMT 2025