0f735657aa
This is a userland-only pointer that isn't relevant to the kernel and doesn't belong in the ioctl structure shared between userland and the kernel. For the kernel, the old structure for the ioctl is still supported under COMPAT_FREEBSD13. This changes vm_snapshot_req() in libvmmapi to accept an explicit vmctx argument. It also changes vm_snapshot_guest2host_addr to take an explicit vmctx argument. As part of this change, move the declaration for this function and its wrapper macro from vmm_snapshot.h to snapshot.h as it is a userland-only API. Reviewed by: corvink, markj Differential Revision: https://reviews.freebsd.org/D38125
131 lines
4.2 KiB
C
131 lines
4.2 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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* $FreeBSD$
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*/
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#ifndef _BHYVE_SNAPSHOT_
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#define _BHYVE_SNAPSHOT_
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#include <machine/vmm_snapshot.h>
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#include <libxo/xo.h>
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#include <ucl.h>
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#define BHYVE_RUN_DIR "/var/run/bhyve/"
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#define MAX_SNAPSHOT_FILENAME PATH_MAX
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struct vmctx;
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struct restore_state {
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int kdata_fd;
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int vmmem_fd;
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void *kdata_map;
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size_t kdata_len;
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size_t vmmem_len;
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struct ucl_parser *meta_parser;
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ucl_object_t *meta_root_obj;
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};
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struct checkpoint_thread_info {
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struct vmctx *ctx;
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int socket_fd;
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};
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typedef int (*vm_snapshot_dev_cb)(struct vm_snapshot_meta *);
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typedef int (*vm_pause_dev_cb) (const char *);
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typedef int (*vm_resume_dev_cb) (const char *);
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struct vm_snapshot_dev_info {
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const char *dev_name; /* device name */
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vm_snapshot_dev_cb snapshot_cb; /* callback for device snapshot */
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vm_pause_dev_cb pause_cb; /* callback for device pause */
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vm_resume_dev_cb resume_cb; /* callback for device resume */
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};
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struct vm_snapshot_kern_info {
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const char *struct_name; /* kernel structure name*/
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enum snapshot_req req; /* request type */
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};
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void destroy_restore_state(struct restore_state *rstate);
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const char *lookup_vmname(struct restore_state *rstate);
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int lookup_memflags(struct restore_state *rstate);
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size_t lookup_memsize(struct restore_state *rstate);
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int lookup_guest_ncpus(struct restore_state *rstate);
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void checkpoint_cpu_add(int vcpu);
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void checkpoint_cpu_resume(int vcpu);
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void checkpoint_cpu_suspend(int vcpu);
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int restore_vm_mem(struct vmctx *ctx, struct restore_state *rstate);
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int vm_restore_kern_structs(struct vmctx *ctx, struct restore_state *rstate);
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int vm_restore_user_devs(struct restore_state *rstate);
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int vm_pause_user_devs(void);
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int vm_resume_user_devs(void);
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int get_checkpoint_msg(int conn_fd, struct vmctx *ctx);
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void *checkpoint_thread(void *param);
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int init_checkpoint_thread(struct vmctx *ctx);
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void init_snapshot(void);
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int load_restore_file(const char *filename, struct restore_state *rstate);
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int vm_snapshot_guest2host_addr(struct vmctx *ctx, void **addrp, size_t len,
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bool restore_null, struct vm_snapshot_meta *meta);
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/*
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* Address variables are pointers to guest memory.
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*
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* When RNULL != 0, do not enforce invalid address checks; instead, make the
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* pointer NULL at restore time.
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*/
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#define SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(CTX, ADDR, LEN, RNULL, META, RES, LABEL) \
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do { \
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(RES) = vm_snapshot_guest2host_addr((CTX), (void **)&(ADDR), (LEN), \
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(RNULL), (META)); \
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if ((RES) != 0) { \
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if ((RES) == EFAULT) \
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fprintf(stderr, "%s: invalid address: %s\r\n", \
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__func__, #ADDR); \
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goto LABEL; \
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} \
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} while (0)
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#endif
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