mirror of https://github.com/F-Stack/f-stack.git
142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2016 Flavius Anton
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* Copyright (c) 2016 Mihai Tiganus
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* Copyright (c) 2016-2019 Mihai Carabas
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* Copyright (c) 2017-2019 Darius Mihai
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* Copyright (c) 2017-2019 Elena Mihailescu
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* Copyright (c) 2018-2019 Sergiu Weisz
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* All rights reserved.
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* The bhyve-snapshot feature was developed under sponsorships
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* from Matthew Grooms.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <machine/vmm_snapshot.h>
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void
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vm_snapshot_buf_err(const char *bufname, const enum vm_snapshot_op op)
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{
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const char *opstr;
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if (op == VM_SNAPSHOT_SAVE)
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opstr = "save";
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else if (op == VM_SNAPSHOT_RESTORE)
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opstr = "restore";
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else
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opstr = "unknown";
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printf("%s: snapshot-%s failed for %s\r\n", __func__, opstr, bufname);
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}
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int
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vm_snapshot_buf(volatile void *data, size_t data_size,
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struct vm_snapshot_meta *meta)
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{
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struct vm_snapshot_buffer *buffer;
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int op;
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void *nv_data;
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nv_data = __DEVOLATILE(void *, data);
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buffer = &meta->buffer;
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op = meta->op;
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if (buffer->buf_rem < data_size) {
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printf("%s: buffer too small\r\n", __func__);
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return (E2BIG);
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}
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if (op == VM_SNAPSHOT_SAVE)
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copyout(nv_data, buffer->buf, data_size);
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else if (op == VM_SNAPSHOT_RESTORE)
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copyin(buffer->buf, nv_data, data_size);
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else
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return (EINVAL);
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buffer->buf += data_size;
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buffer->buf_rem -= data_size;
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return (0);
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}
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size_t
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vm_get_snapshot_size(struct vm_snapshot_meta *meta)
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{
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size_t length;
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struct vm_snapshot_buffer *buffer;
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buffer = &meta->buffer;
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if (buffer->buf_size < buffer->buf_rem) {
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printf("%s: Invalid buffer: size = %zu, rem = %zu\r\n",
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__func__, buffer->buf_size, buffer->buf_rem);
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length = 0;
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} else {
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length = buffer->buf_size - buffer->buf_rem;
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}
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return (length);
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}
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int
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vm_snapshot_buf_cmp(volatile void *data, size_t data_size,
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struct vm_snapshot_meta *meta)
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{
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struct vm_snapshot_buffer *buffer;
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int op;
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int ret;
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void *_data = *(void **)(void *)&data;
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buffer = &meta->buffer;
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op = meta->op;
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if (buffer->buf_rem < data_size) {
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printf("%s: buffer too small\r\n", __func__);
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ret = E2BIG;
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goto done;
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}
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if (op == VM_SNAPSHOT_SAVE) {
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ret = 0;
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copyout(_data, buffer->buf, data_size);
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} else if (op == VM_SNAPSHOT_RESTORE) {
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ret = memcmp(_data, buffer->buf, data_size);
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} else {
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ret = EINVAL;
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goto done;
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}
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buffer->buf += data_size;
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buffer->buf_rem -= data_size;
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done:
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return (ret);
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}
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