/* * QEMU System Emulator * * Copyright (c) 2003-2008 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef MIGRATION_QEMU_FILE_H #define MIGRATION_QEMU_FILE_H #include #include "exec/cpu-common.h" #include "io/channel.h" /* * This function provides hooks around different * stages of RAM migration. * 'data' is call specific data associated with the 'flags' value */ typedef int (QEMURamHookFunc)(QEMUFile *f, uint64_t flags, void *data); /* * Constants used by ram_control_* hooks */ #define RAM_CONTROL_SETUP 0 #define RAM_CONTROL_ROUND 1 #define RAM_CONTROL_HOOK 2 #define RAM_CONTROL_FINISH 3 #define RAM_CONTROL_BLOCK_REG 4 /* * This function allows override of where the RAM page * is saved (such as RDMA, for example.) */ typedef size_t (QEMURamSaveFunc)(QEMUFile *f, ram_addr_t block_offset, ram_addr_t offset, size_t size, uint64_t *bytes_sent); typedef struct QEMUFileHooks { QEMURamHookFunc *before_ram_iterate; QEMURamHookFunc *after_ram_iterate; QEMURamHookFunc *hook_ram_load; QEMURamSaveFunc *save_page; } QEMUFileHooks; QEMUFile *qemu_file_new_input(QIOChannel *ioc); QEMUFile *qemu_file_new_output(QIOChannel *ioc); void qemu_file_set_hooks(QEMUFile *f, const QEMUFileHooks *hooks); int qemu_fclose(QEMUFile *f); /* * qemu_file_total_transferred: * * Report the total number of bytes transferred with * this file. * * For writable files, any pending buffers will be * flushed, so the reported value will be equal to * the number of bytes transferred on the wire. * * For readable files, the reported value will be * equal to the number of bytes transferred on the * wire. * * Returns: the total bytes transferred */ int64_t qemu_file_total_transferred(QEMUFile *f); /* * qemu_file_total_transferred_fast: * * As qemu_file_total_transferred except for writable * files, where no flush is performed and the reported * amount will include the size of any queued buffers, * on top of the amount actually transferred. * * Returns: the total bytes transferred and queued */ int64_t qemu_file_total_transferred_fast(QEMUFile *f); /* * put_buffer without copying the buffer. * The buffer should be available till it is sent asynchronously. */ void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, size_t size, bool may_free); bool qemu_file_mode_is_not_valid(const char *mode); bool qemu_file_is_writable(QEMUFile *f); #include "migration/qemu-file-types.h" size_t coroutine_mixed_fn qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t size, size_t offset); size_t coroutine_mixed_fn qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf, size_t size); ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream, const uint8_t *p, size_t size); int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src); /* * Note that you can only peek continuous bytes from where the current pointer * is; you aren't guaranteed to be able to peak to +n bytes unless you've * previously peeked +n-1. */ int coroutine_mixed_fn qemu_peek_byte(QEMUFile *f, int offset); void qemu_file_skip(QEMUFile *f, int size); /* * qemu_file_credit_transfer: * * Report on a number of bytes that have been transferred * out of band from the main file object I/O methods. This * accounting information tracks the total migration traffic. */ void qemu_file_credit_transfer(QEMUFile *f, size_t size); void qemu_file_reset_rate_limit(QEMUFile *f); /* * qemu_file_acct_rate_limit: * * Report on a number of bytes the have been transferred * out of band from the main file object I/O methods, and * need to be applied to the rate limiting calcuations */ void qemu_file_acct_rate_limit(QEMUFile *f, int64_t len); void qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate); int64_t qemu_file_get_rate_limit(QEMUFile *f); int qemu_file_get_error_obj(QEMUFile *f, Error **errp); int qemu_file_get_error_obj_any(QEMUFile *f1, QEMUFile *f2, Error **errp); void qemu_file_set_error_obj(QEMUFile *f, int ret, Error *err); void qemu_file_set_error(QEMUFile *f, int ret); int qemu_file_shutdown(QEMUFile *f); QEMUFile *qemu_file_get_return_path(QEMUFile *f); void qemu_fflush(QEMUFile *f); void qemu_file_set_blocking(QEMUFile *f, bool block); int qemu_file_get_to_fd(QEMUFile *f, int fd, size_t size); void ram_control_before_iterate(QEMUFile *f, uint64_t flags); void ram_control_after_iterate(QEMUFile *f, uint64_t flags); void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data); /* Whenever this is found in the data stream, the flags * will be passed to ram_control_load_hook in the incoming-migration * side. This lets before_ram_iterate/after_ram_iterate add * transport-specific sections to the RAM migration data. */ #define RAM_SAVE_FLAG_HOOK 0x80 #define RAM_SAVE_CONTROL_NOT_SUPP -1000 #define RAM_SAVE_CONTROL_DELAYED -2000 size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset, ram_addr_t offset, size_t size, uint64_t *bytes_sent); QIOChannel *qemu_file_get_ioc(QEMUFile *file); #endif