h_io_assist.c revision 1.11
1 /* $NetBSD: h_io_assist.c,v 1.11 2019/10/27 07:08:15 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <stdint.h> 35 #include <stdbool.h> 36 #include <unistd.h> 37 #include <string.h> 38 #include <err.h> 39 #include <errno.h> 40 #include <sys/types.h> 41 #include <sys/mman.h> 42 #include <machine/segments.h> 43 #include <machine/psl.h> 44 #include <machine/pte.h> 45 #include <x86/specialreg.h> 46 47 #include <nvmm.h> 48 49 #define PAGE_SIZE 4096 50 #define IO_SIZE 128 51 52 static char iobuf[IO_SIZE]; 53 54 static char *databuf; 55 static uint8_t *instbuf; 56 57 static void 58 init_seg(struct nvmm_x64_state_seg *seg, int type, int sel) 59 { 60 seg->selector = sel; 61 seg->attrib.type = type; 62 seg->attrib.s = (type & 0b10000) != 0; 63 seg->attrib.dpl = 0; 64 seg->attrib.p = 1; 65 seg->attrib.avl = 1; 66 seg->attrib.l = 1; 67 seg->attrib.def = 0; 68 seg->attrib.g = 1; 69 seg->limit = 0x0000FFFF; 70 seg->base = 0x00000000; 71 } 72 73 static void 74 reset_machine(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 75 { 76 struct nvmm_x64_state *state = vcpu->state; 77 78 memset(state, 0, sizeof(*state)); 79 80 /* Default. */ 81 state->gprs[NVMM_X64_GPR_RFLAGS] = PSL_MBO; 82 init_seg(&state->segs[NVMM_X64_SEG_CS], SDT_MEMERA, GSEL(GCODE_SEL, SEL_KPL)); 83 init_seg(&state->segs[NVMM_X64_SEG_SS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 84 init_seg(&state->segs[NVMM_X64_SEG_DS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 85 init_seg(&state->segs[NVMM_X64_SEG_ES], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 86 init_seg(&state->segs[NVMM_X64_SEG_FS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 87 init_seg(&state->segs[NVMM_X64_SEG_GS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 88 89 /* Blank. */ 90 init_seg(&state->segs[NVMM_X64_SEG_GDT], 0, 0); 91 init_seg(&state->segs[NVMM_X64_SEG_IDT], 0, 0); 92 init_seg(&state->segs[NVMM_X64_SEG_LDT], SDT_SYSLDT, 0); 93 init_seg(&state->segs[NVMM_X64_SEG_TR], SDT_SYS386BSY, 0); 94 95 /* Protected mode enabled. */ 96 state->crs[NVMM_X64_CR_CR0] = CR0_PG|CR0_PE|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM; 97 98 /* 64bit mode enabled. */ 99 state->crs[NVMM_X64_CR_CR4] = CR4_PAE; 100 state->msrs[NVMM_X64_MSR_EFER] = EFER_LME | EFER_SCE | EFER_LMA; 101 102 /* Stolen from x86/pmap.c */ 103 #define PATENTRY(n, type) (type << ((n) * 8)) 104 #define PAT_UC 0x0ULL 105 #define PAT_WC 0x1ULL 106 #define PAT_WT 0x4ULL 107 #define PAT_WP 0x5ULL 108 #define PAT_WB 0x6ULL 109 #define PAT_UCMINUS 0x7ULL 110 state->msrs[NVMM_X64_MSR_PAT] = 111 PATENTRY(0, PAT_WB) | PATENTRY(1, PAT_WT) | 112 PATENTRY(2, PAT_UCMINUS) | PATENTRY(3, PAT_UC) | 113 PATENTRY(4, PAT_WB) | PATENTRY(5, PAT_WT) | 114 PATENTRY(6, PAT_UCMINUS) | PATENTRY(7, PAT_UC); 115 116 /* Page tables. */ 117 state->crs[NVMM_X64_CR_CR3] = 0x3000; 118 119 state->gprs[NVMM_X64_GPR_RIP] = 0x2000; 120 121 if (nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 122 err(errno, "nvmm_vcpu_setstate"); 123 } 124 125 static void 126 map_pages(struct nvmm_machine *mach) 127 { 128 pt_entry_t *L4, *L3, *L2, *L1; 129 int ret; 130 131 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 132 -1, 0); 133 if (instbuf == MAP_FAILED) 134 err(errno, "mmap"); 135 databuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 136 -1, 0); 137 if (databuf == MAP_FAILED) 138 err(errno, "mmap"); 139 140 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 141 err(errno, "nvmm_hva_map"); 142 if (nvmm_hva_map(mach, (uintptr_t)databuf, PAGE_SIZE) == -1) 143 err(errno, "nvmm_hva_map"); 144 ret = nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 145 PROT_READ|PROT_EXEC); 146 if (ret == -1) 147 err(errno, "nvmm_gpa_map"); 148 ret = nvmm_gpa_map(mach, (uintptr_t)databuf, 0x1000, PAGE_SIZE, 149 PROT_READ|PROT_WRITE); 150 if (ret == -1) 151 err(errno, "nvmm_gpa_map"); 152 153 L4 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 154 -1, 0); 155 if (L4 == MAP_FAILED) 156 err(errno, "mmap"); 157 L3 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 158 -1, 0); 159 if (L3 == MAP_FAILED) 160 err(errno, "mmap"); 161 L2 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 162 -1, 0); 163 if (L2 == MAP_FAILED) 164 err(errno, "mmap"); 165 L1 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 166 -1, 0); 167 if (L1 == MAP_FAILED) 168 err(errno, "mmap"); 169 170 if (nvmm_hva_map(mach, (uintptr_t)L4, PAGE_SIZE) == -1) 171 err(errno, "nvmm_hva_map"); 172 if (nvmm_hva_map(mach, (uintptr_t)L3, PAGE_SIZE) == -1) 173 err(errno, "nvmm_hva_map"); 174 if (nvmm_hva_map(mach, (uintptr_t)L2, PAGE_SIZE) == -1) 175 err(errno, "nvmm_hva_map"); 176 if (nvmm_hva_map(mach, (uintptr_t)L1, PAGE_SIZE) == -1) 177 err(errno, "nvmm_hva_map"); 178 179 ret = nvmm_gpa_map(mach, (uintptr_t)L4, 0x3000, PAGE_SIZE, 180 PROT_READ|PROT_WRITE); 181 if (ret == -1) 182 err(errno, "nvmm_gpa_map"); 183 ret = nvmm_gpa_map(mach, (uintptr_t)L3, 0x4000, PAGE_SIZE, 184 PROT_READ|PROT_WRITE); 185 if (ret == -1) 186 err(errno, "nvmm_gpa_map"); 187 ret = nvmm_gpa_map(mach, (uintptr_t)L2, 0x5000, PAGE_SIZE, 188 PROT_READ|PROT_WRITE); 189 if (ret == -1) 190 err(errno, "nvmm_gpa_map"); 191 ret = nvmm_gpa_map(mach, (uintptr_t)L1, 0x6000, PAGE_SIZE, 192 PROT_READ|PROT_WRITE); 193 if (ret == -1) 194 err(errno, "nvmm_gpa_map"); 195 196 memset(L4, 0, PAGE_SIZE); 197 memset(L3, 0, PAGE_SIZE); 198 memset(L2, 0, PAGE_SIZE); 199 memset(L1, 0, PAGE_SIZE); 200 201 L4[0] = PTE_P | PTE_W | 0x4000; 202 L3[0] = PTE_P | PTE_W | 0x5000; 203 L2[0] = PTE_P | PTE_W | 0x6000; 204 L1[0x2000 / PAGE_SIZE] = PTE_P | PTE_W | 0x2000; 205 L1[0x1000 / PAGE_SIZE] = PTE_P | PTE_W | 0x1000; 206 } 207 208 /* -------------------------------------------------------------------------- */ 209 210 static size_t iobuf_off = 0; 211 212 static void 213 io_callback(struct nvmm_io *io) 214 { 215 if (io->port != 123) { 216 printf("Wrong port\n"); 217 exit(-1); 218 } 219 220 if (io->in) { 221 memcpy(io->data, iobuf + iobuf_off, io->size); 222 } else { 223 memcpy(iobuf + iobuf_off, io->data, io->size); 224 } 225 iobuf_off += io->size; 226 227 } 228 229 static int 230 handle_io(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 231 { 232 int ret; 233 234 ret = nvmm_assist_io(mach, vcpu); 235 if (ret == -1) { 236 err(errno, "nvmm_assist_io"); 237 } 238 239 return 0; 240 } 241 242 static void 243 run_machine(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 244 { 245 struct nvmm_vcpu_exit *exit = vcpu->exit; 246 247 while (1) { 248 if (nvmm_vcpu_run(mach, vcpu) == -1) 249 err(errno, "nvmm_vcpu_run"); 250 251 switch (exit->reason) { 252 case NVMM_VCPU_EXIT_NONE: 253 break; 254 255 case NVMM_VCPU_EXIT_RDMSR: 256 /* Stop here. */ 257 return; 258 259 case NVMM_VCPU_EXIT_IO: 260 handle_io(mach, vcpu); 261 break; 262 263 case NVMM_VCPU_EXIT_SHUTDOWN: 264 printf("Shutting down!\n"); 265 return; 266 267 default: 268 printf("Invalid!\n"); 269 return; 270 } 271 } 272 } 273 274 /* -------------------------------------------------------------------------- */ 275 276 struct test { 277 const char *name; 278 uint8_t *code_begin; 279 uint8_t *code_end; 280 const char *wanted; 281 bool in; 282 }; 283 284 static void 285 run_test(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu, 286 const struct test *test) 287 { 288 size_t size; 289 char *res; 290 291 size = (size_t)test->code_end - (size_t)test->code_begin; 292 293 reset_machine(mach, vcpu); 294 295 iobuf_off = 0; 296 memset(iobuf, 0, IO_SIZE); 297 memset(databuf, 0, PAGE_SIZE); 298 memcpy(instbuf, test->code_begin, size); 299 300 if (test->in) { 301 strcpy(iobuf, test->wanted); 302 } else { 303 strcpy(databuf, test->wanted); 304 } 305 306 run_machine(mach, vcpu); 307 308 if (test->in) { 309 res = databuf; 310 } else { 311 res = iobuf; 312 } 313 314 if (!strcmp(res, test->wanted)) { 315 printf("Test '%s' passed\n", test->name); 316 } else { 317 printf("Test '%s' failed, wanted '%s', got '%s'\n", test->name, 318 test->wanted, res); 319 } 320 } 321 322 /* -------------------------------------------------------------------------- */ 323 324 extern uint8_t test1_begin, test1_end; 325 extern uint8_t test2_begin, test2_end; 326 extern uint8_t test3_begin, test3_end; 327 extern uint8_t test4_begin, test4_end; 328 extern uint8_t test5_begin, test5_end; 329 extern uint8_t test6_begin, test6_end; 330 extern uint8_t test7_begin, test7_end; 331 extern uint8_t test8_begin, test8_end; 332 extern uint8_t test9_begin, test9_end; 333 extern uint8_t test10_begin, test10_end; 334 extern uint8_t test11_begin, test11_end; 335 extern uint8_t test12_begin, test12_end; 336 337 static const struct test tests[] = { 338 { "test1 - INB", &test1_begin, &test1_end, "12", true }, 339 { "test2 - INW", &test2_begin, &test2_end, "1234", true }, 340 { "test3 - INL", &test3_begin, &test3_end, "12345678", true }, 341 { "test4 - INSB+REP", &test4_begin, &test4_end, "12345", true }, 342 { "test5 - INSW+REP", &test5_begin, &test5_end, 343 "Comment est votre blanquette", true }, 344 { "test6 - INSL+REP", &test6_begin, &test6_end, 345 "123456789abcdefghijklmnopqrs", true }, 346 { "test7 - OUTB", &test7_begin, &test7_end, "12", false }, 347 { "test8 - OUTW", &test8_begin, &test8_end, "1234", false }, 348 { "test9 - OUTL", &test9_begin, &test9_end, "12345678", false }, 349 { "test10 - OUTSB+REP", &test10_begin, &test10_end, "12345", false }, 350 { "test11 - OUTSW+REP", &test11_begin, &test11_end, 351 "Ah, Herr Bramard", false }, 352 { "test12 - OUTSL+REP", &test12_begin, &test12_end, 353 "123456789abcdefghijklmnopqrs", false }, 354 { NULL, NULL, NULL, NULL, false } 355 }; 356 357 static struct nvmm_assist_callbacks callbacks = { 358 .io = io_callback, 359 .mem = NULL 360 }; 361 362 /* 363 * 0x1000: Data, mapped 364 * 0x2000: Instructions, mapped 365 * 0x3000: L4 366 * 0x4000: L3 367 * 0x5000: L2 368 * 0x6000: L1 369 */ 370 int main(int argc, char *argv[]) 371 { 372 struct nvmm_machine mach; 373 struct nvmm_vcpu vcpu; 374 size_t i; 375 376 if (nvmm_init() == -1) 377 err(errno, "nvmm_init"); 378 if (nvmm_machine_create(&mach) == -1) 379 err(errno, "nvmm_machine_create"); 380 if (nvmm_vcpu_create(&mach, 0, &vcpu) == -1) 381 err(errno, "nvmm_vcpu_create"); 382 nvmm_vcpu_configure(&mach, &vcpu, NVMM_VCPU_CONF_CALLBACKS, &callbacks); 383 map_pages(&mach); 384 385 for (i = 0; tests[i].name != NULL; i++) { 386 run_test(&mach, &vcpu, &tests[i]); 387 } 388 389 return 0; 390 } 391
Indexes created Tue Sep 23 13:09:54 GMT 2025