usr.sbin/bhyve/fwctl.c

   1 /*-
   2  * Copyright (c) 2015  Peter Grehan <grehan@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 /*
  30  * Guest firmware interface. Uses i/o ports x510/x511 as Qemu does,
  31  * but with a request/response messaging protocol.
  32  */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/param.h>
  37 #include <sys/types.h>
  38 #include <sys/errno.h>
  39 #include <sys/uio.h>
  40
  41 #include <assert.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #include "bhyverun.h"
  47 #include "inout.h"
  48 #include "fwctl.h"
  49
  50 /*
  51  * Messaging protocol base operations
  52  */
  53 #define OP_NULL         1
  54 #define OP_ECHO         2
  55 #define OP_GET          3
  56 #define OP_GET_LEN      4
  57 #define OP_SET          5
  58 #define OP_MAX          OP_SET
  59
  60 /* I/O ports */
  61 #define FWCTL_OUT       0x510
  62 #define FWCTL_IN        0x511
  63
  64 /*
  65  * Back-end state-machine
  66  */
  67 enum state {
  68         DORMANT,
  69         IDENT_WAIT,
  70         IDENT_SEND,
  71         REQ,
  72         RESP
  73 } be_state = DORMANT;
  74
  75 static uint8_t sig[] = { 'B', 'H', 'Y', 'V' };
  76 static u_int ident_idx;
  77
  78 struct op_info {
  79         int op;
  80         int  (*op_start)(int len);
  81         void (*op_data)(uint32_t data, int len);
  82         int  (*op_result)(struct iovec **data);
  83         void (*op_done)(struct iovec *data);
  84 };
  85 static struct op_info *ops[OP_MAX+1];
  86
  87 /* Return 0-padded uint32_t */
  88 static uint32_t
  89 fwctl_send_rest(uint32_t *data, size_t len)
  90 {
  91         union {
  92                 uint8_t c[4];
  93                 uint32_t w;
  94         } u;
  95         uint8_t *cdata;
  96         int i;
  97
  98         cdata = (uint8_t *) data;
  99         u.w = 0;
 100
 101         for (i = 0, u.w = 0; i < len; i++)
 102                 u.c[i] = *cdata++;
 103
 104         return (u.w);
 105 }
 106
 107 /*
 108  * error op dummy proto - drop all data sent and return an error
 109 */
 110 static int errop_code;
 111
 112 static void
 113 errop_set(int err)
 114 {
 115
 116         errop_code = err;
 117 }
 118
 119 static int
 120 errop_start(int len)
 121 {
 122         errop_code = ENOENT;
 123
 124         /* accept any length */
 125         return (errop_code);
 126 }
 127
 128 static void
 129 errop_data(uint32_t data, int len)
 130 {
 131
 132         /* ignore */
 133 }
 134
 135 static int
 136 errop_result(struct iovec **data)
 137 {
 138
 139         /* no data to send back; always successful */
 140         *data = NULL;
 141         return (errop_code);
 142 }
 143
 144 static void
 145 errop_done(struct iovec *data)
 146 {
 147
 148         /* assert data is NULL */
 149 }
 150
 151 static struct op_info errop_info = {
 152         .op_start  = errop_start,
 153         .op_data   = errop_data,
 154         .op_result = errop_result,
 155         .op_done   = errop_done
 156 };
 157
 158 /* OID search */
 159 SET_DECLARE(ctl_set, struct ctl);
 160
 161 CTL_NODE("hw.ncpu", &guest_ncpus, sizeof(guest_ncpus));
 162
 163 static struct ctl *
 164 ctl_locate(const char *str, int maxlen)
 165 {
 166         struct ctl *cp, **cpp;
 167
 168         SET_FOREACH(cpp, ctl_set)  {
 169                 cp = *cpp;
 170                 if (!strncmp(str, cp->c_oid, maxlen))
 171                         return (cp);
 172         }
 173
 174         return (NULL);
 175 }
 176
 177 /* uefi-sysctl get-len */
 178 #define FGET_STRSZ      80
 179 static struct iovec fget_biov[2];
 180 static char fget_str[FGET_STRSZ];
 181 static struct {
 182         size_t f_sz;
 183         uint32_t f_data[1024];
 184 } fget_buf;
 185 static int fget_cnt;
 186 static size_t fget_size;
 187
 188 static int
 189 fget_start(int len)
 190 {
 191
 192         if (len > FGET_STRSZ)
 193                 return(E2BIG);
 194
 195         fget_cnt = 0;
 196
 197         return (0);
 198 }
 199
 200 static void
 201 fget_data(uint32_t data, int len)
 202 {
 203
 204         *((uint32_t *) &fget_str[fget_cnt]) = data;
 205         fget_cnt += sizeof(uint32_t);
 206 }
 207
 208 static int
 209 fget_result(struct iovec **data, int val)
 210 {
 211         struct ctl *cp;
 212         int err;
 213
 214         err = 0;
 215
 216         /* Locate the OID */
 217         cp = ctl_locate(fget_str, fget_cnt);
 218         if (cp == NULL) {
 219                 *data = NULL;
 220                 err = ENOENT;
 221         } else {
 222                 if (val) {
 223                         /* For now, copy the len/data into a buffer */
 224                         memset(&fget_buf, 0, sizeof(fget_buf));
 225                         fget_buf.f_sz = cp->c_len;
 226                         memcpy(fget_buf.f_data, cp->c_data, cp->c_len);
 227                         fget_biov[0].iov_base = (char *)&fget_buf;
 228                         fget_biov[0].iov_len  = sizeof(fget_buf.f_sz) +
 229                                 cp->c_len;
 230                 } else {
 231                         fget_size = cp->c_len;
 232                         fget_biov[0].iov_base = (char *)&fget_size;
 233                         fget_biov[0].iov_len  = sizeof(fget_size);
 234                 }
 235
 236                 fget_biov[1].iov_base = NULL;
 237                 fget_biov[1].iov_len  = 0;
 238                 *data = fget_biov;
 239         }
 240
 241         return (err);
 242 }
 243
 244 static void
 245 fget_done(struct iovec *data)
 246 {
 247
 248         /* nothing needs to be freed */
 249 }
 250
 251 static int
 252 fget_len_result(struct iovec **data)
 253 {
 254         return (fget_result(data, 0));
 255 }
 256
 257 static int
 258 fget_val_result(struct iovec **data)
 259 {
 260         return (fget_result(data, 1));
 261 }
 262
 263 static struct op_info fgetlen_info = {
 264         .op_start  = fget_start,
 265         .op_data   = fget_data,
 266         .op_result = fget_len_result,
 267         .op_done   = fget_done
 268 };
 269
 270 static struct op_info fgetval_info = {
 271         .op_start  = fget_start,
 272         .op_data   = fget_data,
 273         .op_result = fget_val_result,
 274         .op_done   = fget_done
 275 };
 276
 277 static struct req_info {
 278         int      req_error;
 279         u_int    req_count;
 280         uint32_t req_size;
 281         uint32_t req_type;
 282         uint32_t req_txid;
 283         struct op_info *req_op;
 284         int      resp_error;
 285         int      resp_count;
 286         int      resp_size;
 287         int      resp_off;
 288         struct iovec *resp_biov;
 289 } rinfo;
 290
 291 static void
 292 fwctl_response_done(void)
 293 {
 294
 295         (*rinfo.req_op->op_done)(rinfo.resp_biov);
 296
 297         /* reinit the req data struct */
 298         memset(&rinfo, 0, sizeof(rinfo));
 299 }
 300
 301 static void
 302 fwctl_request_done(void)
 303 {
 304
 305         rinfo.resp_error = (*rinfo.req_op->op_result)(&rinfo.resp_biov);
 306
 307         /* XXX only a single vector supported at the moment */
 308         rinfo.resp_off = 0;
 309         if (rinfo.resp_biov == NULL) {
 310                 rinfo.resp_size = 0;
 311         } else {
 312                 rinfo.resp_size = rinfo.resp_biov[0].iov_len;
 313         }
 314 }
 315
 316 static int
 317 fwctl_request_start(void)
 318 {
 319         int err;
 320
 321         /* Data size doesn't include header */
 322         rinfo.req_size -= 12;
 323
 324         rinfo.req_op = &errop_info;
 325         if (rinfo.req_type <= OP_MAX && ops[rinfo.req_type] != NULL)
 326                 rinfo.req_op = ops[rinfo.req_type];
 327
 328         err = (*rinfo.req_op->op_start)(rinfo.req_size);
 329
 330         if (err) {
 331                 errop_set(err);
 332                 rinfo.req_op = &errop_info;
 333         }
 334
 335         /* Catch case of zero-length message here */
 336         if (rinfo.req_size == 0) {
 337                 fwctl_request_done();
 338                 return (1);
 339         }
 340
 341         return (0);
 342 }
 343
 344 static int
 345 fwctl_request_data(uint32_t value)
 346 {
 347         int remlen;
 348
 349         /* Make sure remaining size is >= 0 */
 350         rinfo.req_size -= sizeof(uint32_t);
 351         remlen = (rinfo.req_size > 0) ? rinfo.req_size: 0;
 352
 353         (*rinfo.req_op->op_data)(value, remlen);
 354
 355         if (rinfo.req_size < sizeof(uint32_t)) {
 356                 fwctl_request_done();
 357                 return (1);
 358         }
 359
 360         return (0);
 361 }
 362
 363 static int
 364 fwctl_request(uint32_t value)
 365 {
 366
 367         int ret;
 368
 369         ret = 0;
 370
 371         switch (rinfo.req_count) {
 372         case 0:
 373                 /* Verify size */
 374                 if (value < 12) {
 375                         printf("msg size error");
 376                         exit(1);
 377                 }
 378                 rinfo.req_size = value;
 379                 rinfo.req_count = 1;
 380                 break;
 381         case 1:
 382                 rinfo.req_type = value;
 383                 rinfo.req_count++;
 384                 break;
 385         case 2:
 386                 rinfo.req_txid = value;
 387                 rinfo.req_count++;
 388                 ret = fwctl_request_start();
 389                 break;
 390         default:
 391                 ret = fwctl_request_data(value);
 392                 break;
 393         }
 394
 395         return (ret);
 396 }
 397
 398 static int
 399 fwctl_response(uint32_t *retval)
 400 {
 401         uint32_t *dp;
 402         int remlen;
 403
 404         switch(rinfo.resp_count) {
 405         case 0:
 406                 /* 4 x u32 header len + data */
 407                 *retval = 4*sizeof(uint32_t) +
 408                     roundup(rinfo.resp_size, sizeof(uint32_t));
 409                 rinfo.resp_count++;
 410                 break;
 411         case 1:
 412                 *retval = rinfo.req_type;
 413                 rinfo.resp_count++;
 414                 break;
 415         case 2:
 416                 *retval = rinfo.req_txid;
 417                 rinfo.resp_count++;
 418                 break;
 419         case 3:
 420                 *retval = rinfo.resp_error;
 421                 rinfo.resp_count++;
 422                 break;
 423         default:
 424                 remlen = rinfo.resp_size - rinfo.resp_off;
 425                 dp = (uint32_t *)
 426                     ((uint8_t *)rinfo.resp_biov->iov_base + rinfo.resp_off);
 427                 if (remlen >= sizeof(uint32_t)) {
 428                         *retval = *dp;
 429                 } else if (remlen > 0) {
 430                         *retval = fwctl_send_rest(dp, remlen);
 431                 }
 432                 rinfo.resp_off += sizeof(uint32_t);
 433                 break;
 434         }
 435
 436         if (rinfo.resp_count > 3 &&
 437             rinfo.resp_size - rinfo.resp_off <= 0) {
 438                 fwctl_response_done();
 439                 return (1);
 440         }
 441
 442         return (0);
 443 }
 444
 445
 446 /*
 447  * i/o port handling.
 448  */
 449 static uint8_t
 450 fwctl_inb(void)
 451 {
 452         uint8_t retval;
 453
 454         retval = 0xff;
 455
 456         switch (be_state) {
 457         case IDENT_SEND:
 458                 retval = sig[ident_idx++];
 459                 if (ident_idx >= sizeof(sig))
 460                         be_state = REQ;
 461                 break;
 462         default:
 463                 break;
 464         }
 465
 466         return (retval);
 467 }
 468
 469 static void
 470 fwctl_outw(uint16_t val)
 471 {
 472         switch (be_state) {
 473         case IDENT_WAIT:
 474                 if (val == 0) {
 475                         be_state = IDENT_SEND;
 476                         ident_idx = 0;
 477                 }
 478                 break;
 479         default:
 480                 /* ignore */
 481                 break;
 482         }
 483 }
 484
 485 static uint32_t
 486 fwctl_inl(void)
 487 {
 488         uint32_t retval;
 489
 490         switch (be_state) {
 491         case RESP:
 492                 if (fwctl_response(&retval))
 493                         be_state = REQ;
 494                 break;
 495         default:
 496                 retval = 0xffffffff;
 497                 break;
 498         }
 499
 500         return (retval);
 501 }
 502
 503 static void
 504 fwctl_outl(uint32_t val)
 505 {
 506
 507         switch (be_state) {
 508         case REQ:
 509                 if (fwctl_request(val))
 510                         be_state = RESP;
 511         default:
 512                 break;
 513         }
 514
 515 }
 516
 517 static int
 518 fwctl_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
 519     uint32_t *eax, void *arg)
 520 {
 521
 522         if (in) {
 523                 if (bytes == 1)
 524                         *eax = fwctl_inb();
 525                 else if (bytes == 4)
 526                         *eax = fwctl_inl();
 527                 else
 528                         *eax = 0xffff;
 529         } else {
 530                 if (bytes == 2)
 531                         fwctl_outw(*eax);
 532                 else if (bytes == 4)
 533                         fwctl_outl(*eax);
 534         }
 535
 536         return (0);
 537 }
 538 INOUT_PORT(fwctl_wreg, FWCTL_OUT, IOPORT_F_INOUT, fwctl_handler);
 539 INOUT_PORT(fwctl_rreg, FWCTL_IN,  IOPORT_F_IN,    fwctl_handler);
 540
 541 void
 542 fwctl_init(void)
 543 {
 544
 545         ops[OP_GET_LEN] = &fgetlen_info;
 546         ops[OP_GET]     = &fgetval_info;
 547
 548         be_state = IDENT_WAIT;
 549 }