9366f41860
The current savevm/loadvm protocol has some draw backs. It does not support the ability to do progressive saving which means it cannot be used for live checkpointing or migration. The sections sizes are 32-bit integers which means that it will not function when using more than 4GB of memory for a guest. It attempts to seek within the output file which means it cannot be streamed. The current protocol also is pretty lax about how it supports forward compatibility. If a saved section version is greater than what the restore code support, the restore code generally treats the saved data as being in whatever version it supports. This means that restoring a saved VM on an older version of QEMU will likely result in silent guest failure. This patch introduces a new version of the savevm protocol. It has the following features: * Support for progressive save of sections (for live checkpoint/migration) * An asynchronous API for doing save * Support for interleaving multiple progressive save sections (for future support of memory hot-add/storage migration) * Fully streaming format * Strong section version checking Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5434 c046a42c-6fe2-441c-8c8c-71466251a162
252 lines
7.0 KiB
C
252 lines
7.0 KiB
C
/* Declarations for use by hardware emulation. */
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#ifndef QEMU_HW_H
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#define QEMU_HW_H
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#include "qemu-common.h"
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#include "irq.h"
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/* VM Load/Save */
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/* This function writes a chunk of data to a file at the given position.
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* The pos argument can be ignored if the file is only being used for
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* streaming. The handler should try to write all of the data it can.
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*/
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typedef void (QEMUFilePutBufferFunc)(void *opaque, const uint8_t *buf,
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int64_t pos, int size);
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/* Read a chunk of data from a file at the given position. The pos argument
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* can be ignored if the file is only be used for streaming. The number of
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* bytes actually read should be returned.
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*/
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typedef int (QEMUFileGetBufferFunc)(void *opaque, uint8_t *buf,
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int64_t pos, int size);
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/* Close a file and return an error code */
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typedef int (QEMUFileCloseFunc)(void *opaque);
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/* Called to determine if the file has exceeded it's bandwidth allocation. The
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* bandwidth capping is a soft limit, not a hard limit.
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*/
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typedef int (QEMUFileRateLimit)(void *opaque);
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QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
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QEMUFileGetBufferFunc *get_buffer,
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QEMUFileCloseFunc *close,
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QEMUFileRateLimit *rate_limit);
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QEMUFile *qemu_fopen(const char *filename, const char *mode);
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QEMUFile *qemu_fopen_fd(int fd);
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void qemu_fflush(QEMUFile *f);
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int qemu_fclose(QEMUFile *f);
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void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size);
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void qemu_put_byte(QEMUFile *f, int v);
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static inline void qemu_put_ubyte(QEMUFile *f, unsigned int v)
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{
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qemu_put_byte(f, (int)v);
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}
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#define qemu_put_sbyte qemu_put_byte
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void qemu_put_be16(QEMUFile *f, unsigned int v);
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void qemu_put_be32(QEMUFile *f, unsigned int v);
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void qemu_put_be64(QEMUFile *f, uint64_t v);
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int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size);
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int qemu_get_byte(QEMUFile *f);
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static inline unsigned int qemu_get_ubyte(QEMUFile *f)
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{
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return (unsigned int)qemu_get_byte(f);
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}
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#define qemu_get_sbyte qemu_get_byte
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unsigned int qemu_get_be16(QEMUFile *f);
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unsigned int qemu_get_be32(QEMUFile *f);
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uint64_t qemu_get_be64(QEMUFile *f);
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int qemu_file_rate_limit(QEMUFile *f);
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/* Try to send any outstanding data. This function is useful when output is
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* halted due to rate limiting or EAGAIN errors occur as it can be used to
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* resume output. */
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void qemu_file_put_notify(QEMUFile *f);
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static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv)
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{
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qemu_put_be64(f, *pv);
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}
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static inline void qemu_put_be32s(QEMUFile *f, const uint32_t *pv)
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{
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qemu_put_be32(f, *pv);
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}
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static inline void qemu_put_be16s(QEMUFile *f, const uint16_t *pv)
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{
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qemu_put_be16(f, *pv);
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}
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static inline void qemu_put_8s(QEMUFile *f, const uint8_t *pv)
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{
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qemu_put_byte(f, *pv);
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}
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static inline void qemu_get_be64s(QEMUFile *f, uint64_t *pv)
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{
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*pv = qemu_get_be64(f);
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}
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static inline void qemu_get_be32s(QEMUFile *f, uint32_t *pv)
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{
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*pv = qemu_get_be32(f);
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}
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static inline void qemu_get_be16s(QEMUFile *f, uint16_t *pv)
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{
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*pv = qemu_get_be16(f);
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}
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static inline void qemu_get_8s(QEMUFile *f, uint8_t *pv)
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{
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*pv = qemu_get_byte(f);
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}
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// Signed versions for type safety
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static inline void qemu_put_sbuffer(QEMUFile *f, const int8_t *buf, int size)
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{
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qemu_put_buffer(f, (const uint8_t *)buf, size);
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}
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static inline void qemu_put_sbe16(QEMUFile *f, int v)
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{
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qemu_put_be16(f, (unsigned int)v);
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}
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static inline void qemu_put_sbe32(QEMUFile *f, int v)
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{
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qemu_put_be32(f, (unsigned int)v);
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}
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static inline void qemu_put_sbe64(QEMUFile *f, int64_t v)
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{
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qemu_put_be64(f, (uint64_t)v);
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}
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static inline size_t qemu_get_sbuffer(QEMUFile *f, int8_t *buf, int size)
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{
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return qemu_get_buffer(f, (uint8_t *)buf, size);
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}
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static inline int qemu_get_sbe16(QEMUFile *f)
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{
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return (int)qemu_get_be16(f);
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}
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static inline int qemu_get_sbe32(QEMUFile *f)
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{
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return (int)qemu_get_be32(f);
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}
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static inline int64_t qemu_get_sbe64(QEMUFile *f)
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{
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return (int64_t)qemu_get_be64(f);
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}
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static inline void qemu_put_s8s(QEMUFile *f, const int8_t *pv)
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{
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qemu_put_8s(f, (const uint8_t *)pv);
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}
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static inline void qemu_put_sbe16s(QEMUFile *f, const int16_t *pv)
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{
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qemu_put_be16s(f, (const uint16_t *)pv);
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}
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static inline void qemu_put_sbe32s(QEMUFile *f, const int32_t *pv)
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{
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qemu_put_be32s(f, (const uint32_t *)pv);
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}
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static inline void qemu_put_sbe64s(QEMUFile *f, const int64_t *pv)
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{
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qemu_put_be64s(f, (const uint64_t *)pv);
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}
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static inline void qemu_get_s8s(QEMUFile *f, int8_t *pv)
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{
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qemu_get_8s(f, (uint8_t *)pv);
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}
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static inline void qemu_get_sbe16s(QEMUFile *f, int16_t *pv)
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{
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qemu_get_be16s(f, (uint16_t *)pv);
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}
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static inline void qemu_get_sbe32s(QEMUFile *f, int32_t *pv)
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{
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qemu_get_be32s(f, (uint32_t *)pv);
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}
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static inline void qemu_get_sbe64s(QEMUFile *f, int64_t *pv)
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{
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qemu_get_be64s(f, (uint64_t *)pv);
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}
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#ifdef NEED_CPU_H
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#if TARGET_LONG_BITS == 64
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#define qemu_put_betl qemu_put_be64
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#define qemu_get_betl qemu_get_be64
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#define qemu_put_betls qemu_put_be64s
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#define qemu_get_betls qemu_get_be64s
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#define qemu_put_sbetl qemu_put_sbe64
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#define qemu_get_sbetl qemu_get_sbe64
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#define qemu_put_sbetls qemu_put_sbe64s
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#define qemu_get_sbetls qemu_get_sbe64s
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#else
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#define qemu_put_betl qemu_put_be32
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#define qemu_get_betl qemu_get_be32
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#define qemu_put_betls qemu_put_be32s
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#define qemu_get_betls qemu_get_be32s
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#define qemu_put_sbetl qemu_put_sbe32
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#define qemu_get_sbetl qemu_get_sbe32
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#define qemu_put_sbetls qemu_put_sbe32s
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#define qemu_get_sbetls qemu_get_sbe32s
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#endif
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#endif
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int64_t qemu_ftell(QEMUFile *f);
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int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence);
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typedef void SaveStateHandler(QEMUFile *f, void *opaque);
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typedef int SaveLiveStateHandler(QEMUFile *f, int stage, void *opaque);
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typedef int LoadStateHandler(QEMUFile *f, void *opaque, int version_id);
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int register_savevm(const char *idstr,
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int instance_id,
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int version_id,
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SaveStateHandler *save_state,
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LoadStateHandler *load_state,
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void *opaque);
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int register_savevm_live(const char *idstr,
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int instance_id,
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int version_id,
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SaveLiveStateHandler *save_live_state,
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SaveStateHandler *save_state,
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LoadStateHandler *load_state,
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void *opaque);
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typedef void QEMUResetHandler(void *opaque);
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void qemu_register_reset(QEMUResetHandler *func, void *opaque);
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/* handler to set the boot_device for a specific type of QEMUMachine */
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/* return 0 if success */
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typedef int QEMUBootSetHandler(void *opaque, const char *boot_device);
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void qemu_register_boot_set(QEMUBootSetHandler *func, void *opaque);
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/* These should really be in isa.h, but are here to make pc.h happy. */
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typedef void (IOPortWriteFunc)(void *opaque, uint32_t address, uint32_t data);
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typedef uint32_t (IOPortReadFunc)(void *opaque, uint32_t address);
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#endif
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