vmm_snapshot.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2016 Flavius Anton
    5  * Copyright (c) 2016 Mihai Tiganus
    6  * Copyright (c) 2016-2019 Mihai Carabas
    7  * Copyright (c) 2017-2019 Darius Mihai
    8  * Copyright (c) 2017-2019 Elena Mihailescu
    9  * Copyright (c) 2018-2019 Sergiu Weisz
   10  * All rights reserved.
   11  * The bhyve-snapshot feature was developed under sponsorships
   12  * from Matthew Grooms.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD$");
   38 
   39 #include <sys/types.h>
   40 #include <sys/systm.h>
   41 
   42 #include <machine/vmm_snapshot.h>
   43 
   44 void
   45 vm_snapshot_buf_err(const char *bufname, const enum vm_snapshot_op op)
   46 {
   47         const char *opstr;
   48 
   49         if (op == VM_SNAPSHOT_SAVE)
   50                 opstr = "save";
   51         else if (op == VM_SNAPSHOT_RESTORE)
   52                 opstr = "restore";
   53         else
   54                 opstr = "unknown";
   55 
   56         printf("%s: snapshot-%s failed for %s\r\n", __func__, opstr, bufname);
   57 }
   58 
   59 int
   60 vm_snapshot_buf(void *data, size_t data_size, struct vm_snapshot_meta *meta)
   61 {
   62         struct vm_snapshot_buffer *buffer;
   63         int op;
   64 
   65         buffer = &meta->buffer;
   66         op = meta->op;
   67 
   68         if (buffer->buf_rem < data_size) {
   69                 printf("%s: buffer too small\r\n", __func__);
   70                 return (E2BIG);
   71         }
   72 
   73         if (op == VM_SNAPSHOT_SAVE)
   74                 copyout(data, buffer->buf, data_size);
   75         else if (op == VM_SNAPSHOT_RESTORE)
   76                 copyin(buffer->buf, data, data_size);
   77         else
   78                 return (EINVAL);
   79 
   80         buffer->buf += data_size;
   81         buffer->buf_rem -= data_size;
   82 
   83         return (0);
   84 }
   85 
   86 size_t
   87 vm_get_snapshot_size(struct vm_snapshot_meta *meta)
   88 {
   89         size_t length;
   90         struct vm_snapshot_buffer *buffer;
   91 
   92         buffer = &meta->buffer;
   93 
   94         if (buffer->buf_size < buffer->buf_rem) {
   95                 printf("%s: Invalid buffer: size = %zu, rem = %zu\r\n",
   96                        __func__, buffer->buf_size, buffer->buf_rem);
   97                 length = 0;
   98         } else {
   99                 length = buffer->buf_size - buffer->buf_rem;
  100         }
  101 
  102         return (length);
  103 }
  104 
  105 int
  106 vm_snapshot_buf_cmp(void *data, size_t data_size, struct vm_snapshot_meta *meta)
  107 {
  108         struct vm_snapshot_buffer *buffer;
  109         int op;
  110         int ret;
  111 
  112         buffer = &meta->buffer;
  113         op = meta->op;
  114 
  115         if (buffer->buf_rem < data_size) {
  116                 printf("%s: buffer too small\r\n", __func__);
  117                 ret = E2BIG;
  118                 goto done;
  119         }
  120 
  121         if (op == VM_SNAPSHOT_SAVE) {
  122                 ret = 0;
  123                 copyout(data, buffer->buf, data_size);
  124         } else if (op == VM_SNAPSHOT_RESTORE) {
  125                 ret = memcmp(data, buffer->buf, data_size);
  126         } else {
  127                 ret = EINVAL;
  128                 goto done;
  129         }
  130 
  131         buffer->buf += data_size;
  132         buffer->buf_rem -= data_size;
  133 
  134 done:
  135         return (ret);
  136 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/vmm/vmm_snapshot.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/vmm_snapshot.c