| 1 | /* |
| 2 | * Copyright (c) 2021-2023 Oracle and/or its affiliates. |
| 3 | * |
| 4 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 5 | * See the COPYING file in the top-level directory. |
| 6 | */ |
| 7 | |
| 8 | #include "qemu/osdep.h" |
| 9 | #include "system/ramblock.h" |
| 10 | #include "qemu/cutils.h" |
| 11 | #include "qemu/error-report.h" |
| 12 | #include "qapi/error.h" |
| 13 | #include "channel.h" |
| 14 | #include "file.h" |
| 15 | #include "migration.h" |
| 16 | #include "io/channel-file.h" |
| 17 | #include "io/channel-socket.h" |
| 18 | #include "io/channel-util.h" |
| 19 | #include "options.h" |
| 20 | #include "trace.h" |
| 21 | |
| 22 | #define OFFSET_OPTION ",offset=" |
| 23 | |
| 24 | static struct FileOutgoingArgs { |
| 25 | char *fname; |
| 26 | } outgoing_args; |
| 27 | |
| 28 | /* Remove the offset option from @filespec and return it in @offsetp. */ |
| 29 | |
| 30 | int file_parse_offset(char *filespec, uint64_t *offsetp, Error **errp) |
| 31 | { |
| 32 | char *option = strstr(filespec, OFFSET_OPTION); |
| 33 | int ret; |
| 34 | |
| 35 | if (option) { |
| 36 | *option = 0; |
| 37 | option += sizeof(OFFSET_OPTION) - 1; |
| 38 | ret = qemu_strtosz(option, NULL, offsetp); |
| 39 | if (ret) { |
| 40 | error_setg_errno(errp, -ret, "file URI has bad offset %s", option); |
| 41 | return -1; |
| 42 | } |
| 43 | } |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | void file_cleanup_outgoing_migration(void) |
| 48 | { |
| 49 | g_free(outgoing_args.fname); |
| 50 | outgoing_args.fname = NULL; |
| 51 | } |
| 52 | |
| 53 | static void file_enable_direct_io(int *flags) |
| 54 | { |
| 55 | #ifdef O_DIRECT |
| 56 | *flags |= O_DIRECT; |
| 57 | #else |
| 58 | /* it should have been rejected when setting the parameter */ |
| 59 | g_assert_not_reached(); |
| 60 | #endif |
| 61 | } |
| 62 | |
| 63 | bool file_send_channel_create(gpointer opaque, Error **errp) |
| 64 | { |
| 65 | QIOChannelFile *ioc; |
| 66 | int flags = O_WRONLY; |
| 67 | bool ret = true; |
| 68 | |
| 69 | if (migrate_direct_io()) { |
| 70 | /* |
| 71 | * Enable O_DIRECT for the secondary channels. These are used |
| 72 | * for sending ram pages and writes should be guaranteed to be |
| 73 | * aligned to at least page size. |
| 74 | */ |
| 75 | file_enable_direct_io(&flags); |
| 76 | } |
| 77 | |
| 78 | ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp); |
| 79 | if (!ioc) { |
| 80 | ret = false; |
| 81 | goto out; |
| 82 | } |
| 83 | |
| 84 | multifd_channel_connect(opaque, QIO_CHANNEL(ioc)); |
| 85 | |
| 86 | out: |
| 87 | /* |
| 88 | * File channel creation is synchronous. However posting this |
| 89 | * semaphore here is simpler than adding a special case. |
| 90 | */ |
| 91 | multifd_send_channel_created(); |
| 92 | |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | QIOChannel *file_connect_outgoing(MigrationState *s, |
| 97 | FileMigrationArgs *file_args, Error **errp) |
| 98 | { |
| 99 | QIOChannelFile *fioc = NULL; |
| 100 | g_autofree char *filename = g_strdup(file_args->filename); |
| 101 | uint64_t offset = file_args->offset; |
| 102 | QIOChannel *ioc = NULL; |
| 103 | |
| 104 | trace_migration_file_outgoing(filename); |
| 105 | |
| 106 | fioc = qio_channel_file_new_path(filename, O_CREAT | O_WRONLY, 0600, errp); |
| 107 | if (!fioc) { |
| 108 | goto out; |
| 109 | } |
| 110 | |
| 111 | if (ftruncate(fioc->fd, offset)) { |
| 112 | error_setg_errno(errp, errno, |
| 113 | "failed to truncate migration file to offset %" PRIx64, |
| 114 | offset); |
| 115 | object_unref(OBJECT(fioc)); |
| 116 | goto out; |
| 117 | } |
| 118 | |
| 119 | outgoing_args.fname = g_strdup(filename); |
| 120 | |
| 121 | ioc = QIO_CHANNEL(fioc); |
| 122 | if (offset && qio_channel_io_seek(ioc, offset, SEEK_SET, errp) < 0) { |
| 123 | object_unref(OBJECT(fioc)); |
| 124 | ioc = NULL; |
| 125 | goto out; |
| 126 | } |
| 127 | qio_channel_set_name(ioc, "migration-file-outgoing"); |
| 128 | out: |
| 129 | return ioc; |
| 130 | } |
| 131 | |
| 132 | static gboolean file_accept_incoming_migration(QIOChannel *ioc, |
| 133 | GIOCondition condition, |
| 134 | gpointer opaque) |
| 135 | { |
| 136 | migration_channel_process_incoming(ioc); |
| 137 | object_unref(OBJECT(ioc)); |
| 138 | return G_SOURCE_REMOVE; |
| 139 | } |
| 140 | |
| 141 | static void file_create_incoming_channels(QIOChannel *ioc, char *filename, |
| 142 | Error **errp) |
| 143 | { |
| 144 | int i, channels = 1; |
| 145 | g_autofree QIOChannel **iocs = NULL; |
| 146 | int flags = O_RDONLY; |
| 147 | |
| 148 | if (migrate_multifd()) { |
| 149 | channels += migrate_multifd_channels(); |
| 150 | if (migrate_direct_io()) { |
| 151 | file_enable_direct_io(&flags); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | iocs = g_new0(QIOChannel *, channels); |
| 156 | iocs[0] = ioc; |
| 157 | |
| 158 | for (i = 1; i < channels; i++) { |
| 159 | QIOChannelFile *fioc = qio_channel_file_new_path(filename, flags, 0, errp); |
| 160 | |
| 161 | if (!fioc) { |
| 162 | while (i) { |
| 163 | object_unref(iocs[--i]); |
| 164 | } |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | iocs[i] = QIO_CHANNEL(fioc); |
| 169 | } |
| 170 | |
| 171 | for (i = 0; i < channels; i++) { |
| 172 | qio_channel_set_name(iocs[i], "migration-file-incoming"); |
| 173 | qio_channel_add_watch_full(iocs[i], G_IO_IN, |
| 174 | file_accept_incoming_migration, |
| 175 | NULL, NULL, |
| 176 | g_main_context_get_thread_default()); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | void file_connect_incoming(FileMigrationArgs *file_args, Error **errp) |
| 181 | { |
| 182 | g_autofree char *filename = g_strdup(file_args->filename); |
| 183 | QIOChannelFile *fioc = NULL; |
| 184 | uint64_t offset = file_args->offset; |
| 185 | |
| 186 | trace_migration_file_incoming(filename); |
| 187 | |
| 188 | fioc = qio_channel_file_new_path(filename, O_RDONLY, 0, errp); |
| 189 | if (!fioc) { |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | if (offset && |
| 194 | qio_channel_io_seek(QIO_CHANNEL(fioc), offset, SEEK_SET, errp) < 0) { |
| 195 | object_unref(OBJECT(fioc)); |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | file_create_incoming_channels(QIO_CHANNEL(fioc), filename, errp); |
| 200 | } |
| 201 | |
| 202 | int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov, |
| 203 | int niov, MultiFDPages_t *pages, Error **errp) |
| 204 | { |
| 205 | int ret = 0; |
| 206 | int i, slice_idx, slice_num; |
| 207 | uintptr_t base, next, offset; |
| 208 | size_t len; |
| 209 | RAMBlock *block = pages->block; |
| 210 | |
| 211 | slice_idx = 0; |
| 212 | slice_num = 1; |
| 213 | |
| 214 | /* |
| 215 | * If the iov array doesn't have contiguous elements, we need to |
| 216 | * split it in slices because we only have one file offset for the |
| 217 | * whole iov. Do this here so callers don't need to break the iov |
| 218 | * array themselves. |
| 219 | */ |
| 220 | for (i = 0; i < niov; i++, slice_num++) { |
| 221 | base = (uintptr_t) iov[i].iov_base; |
| 222 | |
| 223 | if (i != niov - 1) { |
| 224 | len = iov[i].iov_len; |
| 225 | next = (uintptr_t) iov[i + 1].iov_base; |
| 226 | |
| 227 | if (base + len == next) { |
| 228 | continue; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * Use the offset of the first element of the segment that |
| 234 | * we're sending. |
| 235 | */ |
| 236 | offset = (uintptr_t) iov[slice_idx].iov_base - (uintptr_t) block->host; |
| 237 | if (offset >= block->used_length) { |
| 238 | error_setg(errp, "offset %" PRIxPTR |
| 239 | "outside of ramblock %s range", offset, block->idstr); |
| 240 | ret = -1; |
| 241 | break; |
| 242 | } |
| 243 | |
| 244 | ret = qio_channel_pwritev_all(ioc, &iov[slice_idx], slice_num, |
| 245 | block->pages_offset + offset, errp); |
| 246 | if (ret < 0) { |
| 247 | break; |
| 248 | } |
| 249 | |
| 250 | slice_idx += slice_num; |
| 251 | slice_num = 0; |
| 252 | } |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | int multifd_file_recv_data(MultiFDRecvParams *p, Error **errp) |
| 258 | { |
| 259 | ERRP_GUARD(); |
| 260 | MultiFDRecvData *data = p->data; |
| 261 | int ret; |
| 262 | |
| 263 | ret = qio_channel_pread_all(p->c, (char *) data->opaque, |
| 264 | data->size, data->file_offset, errp); |
| 265 | if (ret != 0) { |
| 266 | error_prepend(errp, |
| 267 | "multifd recv (%u): ", |
| 268 | p->id); |
| 269 | return -1; |
| 270 | } |
| 271 | |
| 272 | return 0; |
| 273 | } |