Hi Green,
2011/2/21 ya su <suya94335@xxxxxxxxx>:
> Yoshiaki:
>
> I have one question about ram_save_live, during migration 3
> stage(completation stage), it will call
> cpu_physical_memory_set_dirty_tracking(0) to stop recording ram dirty pages.
> at the end of migrate_ft_trans_connect function, it will invoke vm_start(),
> at this time, cpu_physical_memory_set_dirty_tracking(1) is not called yet,
> so there may have some ram pages not recorded when qemu_savevm_trans_begin
> is called. I think you need calll
> cpu_physical_memory_set_dirty_tracking(1) in migrate_ft_trans_connect
> function, Am I right?
Thank you for taking a look.
When qemu_savevm_trans_begin is called for the first time, it
calls ram_save_live with stage 1, that sends all pages and sets
dirty tracking, so there won't be missing pages. Note that
event-tap is turned on by then, meaning no outputs are sent before
finishing the first transaction. I understand that this
implementation is inefficient, and planning to introduce a new
stage that is almost same as stage 3 but keeps dirty tracking in
the future.
Thanks,
Yoshi
>
> BR
>
> Green.
>
>
> 2011/2/10 Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
>>
>> This code implements VM transaction protocol. Like buffered_file, it
>> sits between savevm and migration layer. With this architecture, VM
>> transaction protocol is implemented mostly independent from other
>> existing code.
>>
>> Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
>> Signed-off-by: OHMURA Kei <ohmura.kei@xxxxxxxxxxxxx>
>> ---
>> Makefile.objs | 1 +
>> ft_trans_file.c | 624
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> ft_trans_file.h | 72 +++++++
>> migration.c | 3 +
>> trace-events | 15 ++
>> 5 files changed, 715 insertions(+), 0 deletions(-)
>> create mode 100644 ft_trans_file.c
>> create mode 100644 ft_trans_file.h
>>
>> diff --git a/Makefile.objs b/Makefile.objs
>> index 353b1a8..04148b5 100644
>> --- a/Makefile.objs
>> +++ b/Makefile.objs
>> @@ -100,6 +100,7 @@ common-obj-y += msmouse.o ps2.o
>> common-obj-y += qdev.o qdev-properties.o
>> common-obj-y += block-migration.o
>> common-obj-y += pflib.o
>> +common-obj-y += ft_trans_file.o
>>
>> common-obj-$(CONFIG_BRLAPI) += baum.o
>> common-obj-$(CONFIG_POSIX) += migration-exec.o migration-unix.o
>> migration-fd.o
>> diff --git a/ft_trans_file.c b/ft_trans_file.c
>> new file mode 100644
>> index 0000000..2b42b95
>> --- /dev/null
>> +++ b/ft_trans_file.c
>> @@ -0,0 +1,624 @@
>> +/*
>> + * Fault tolerant VM transaction QEMUFile
>> + *
>> + * Copyright (c) 2010 Nippon Telegraph and Telephone Corporation.
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2. See
>> + * the COPYING file in the top-level directory.
>> + *
>> + * This source code is based on buffered_file.c.
>> + * Copyright IBM, Corp. 2008
>> + * Authors:
>> + * Anthony Liguori <aliguori@xxxxxxxxxx>
>> + */
>> +
>> +#include "qemu-common.h"
>> +#include "qemu-error.h"
>> +#include "hw/hw.h"
>> +#include "qemu-timer.h"
>> +#include "sysemu.h"
>> +#include "qemu-char.h"
>> +#include "trace.h"
>> +#include "ft_trans_file.h"
>> +
>> +typedef struct FtTransHdr
>> +{
>> + uint16_t cmd;
>> + uint16_t id;
>> + uint32_t seq;
>> + uint32_t payload_len;
>> +} FtTransHdr;
>> +
>> +typedef struct QEMUFileFtTrans
>> +{
>> + FtTransPutBufferFunc *put_buffer;
>> + FtTransGetBufferFunc *get_buffer;
>> + FtTransPutReadyFunc *put_ready;
>> + FtTransGetReadyFunc *get_ready;
>> + FtTransWaitForUnfreezeFunc *wait_for_unfreeze;
>> + FtTransCloseFunc *close;
>> + void *opaque;
>> + QEMUFile *file;
>> +
>> + enum QEMU_VM_TRANSACTION_STATE state;
>> + uint32_t seq;
>> + uint16_t id;
>> +
>> + int has_error;
>> +
>> + bool freeze_output;
>> + bool freeze_input;
>> + bool rate_limit;
>> + bool is_sender;
>> + bool is_payload;
>> +
>> + uint8_t *buf;
>> + size_t buf_max_size;
>> + size_t put_offset;
>> + size_t get_offset;
>> +
>> + FtTransHdr header;
>> + size_t header_offset;
>> +} QEMUFileFtTrans;
>> +
>> +#define IO_BUF_SIZE 32768
>> +
>> +static void ft_trans_append(QEMUFileFtTrans *s,
>> + const uint8_t *buf, size_t size)
>> +{
>> + if (size > (s->buf_max_size - s->put_offset)) {
>> + trace_ft_trans_realloc(s->buf_max_size, size + 1024);
>> + s->buf_max_size += size + 1024;
>> + s->buf = qemu_realloc(s->buf, s->buf_max_size);
>> + }
>> +
>> + trace_ft_trans_append(size);
>> + memcpy(s->buf + s->put_offset, buf, size);
>> + s->put_offset += size;
>> +}
>> +
>> +static void ft_trans_flush(QEMUFileFtTrans *s)
>> +{
>> + size_t offset = 0;
>> +
>> + if (s->has_error) {
>> + error_report("flush when error %d, bailing", s->has_error);
>> + return;
>> + }
>> +
>> + while (offset < s->put_offset) {
>> + ssize_t ret;
>> +
>> + ret = s->put_buffer(s->opaque, s->buf + offset, s->put_offset -
>> offset);
>> + if (ret == -EAGAIN) {
>> + break;
>> + }
>> +
>> + if (ret <= 0) {
>> + error_report("error flushing data, %s", strerror(errno));
>> + s->has_error = FT_TRANS_ERR_FLUSH;
>> + break;
>> + } else {
>> + offset += ret;
>> + }
>> + }
>> +
>> + trace_ft_trans_flush(offset, s->put_offset);
>> + memmove(s->buf, s->buf + offset, s->put_offset - offset);
>> + s->put_offset -= offset;
>> + s->freeze_output = !!s->put_offset;
>> +}
>> +
>> +static ssize_t ft_trans_put(void *opaque, void *buf, int size)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + size_t offset = 0;
>> + ssize_t len;
>> +
>> + /* flush buffered data before putting next */
>> + if (s->put_offset) {
>> + ft_trans_flush(s);
>> + }
>> +
>> + while (!s->freeze_output && offset < size) {
>> + len = s->put_buffer(s->opaque, (uint8_t *)buf + offset, size -
>> offset);
>> +
>> + if (len == -EAGAIN) {
>> + trace_ft_trans_freeze_output();
>> + s->freeze_output = 1;
>> + break;
>> + }
>> +
>> + if (len <= 0) {
>> + error_report("putting data failed, %s", strerror(errno));
>> + s->has_error = 1;
>> + offset = -EINVAL;
>> + break;
>> + }
>> +
>> + offset += len;
>> + }
>> +
>> + if (s->freeze_output) {
>> + ft_trans_append(s, buf + offset, size - offset);
>> + offset = size;
>> + }
>> +
>> + return offset;
>> +}
>> +
>> +static int ft_trans_send_header(QEMUFileFtTrans *s,
>> + enum QEMU_VM_TRANSACTION_STATE state,
>> + uint32_t payload_len)
>> +{
>> + int ret;
>> + FtTransHdr *hdr = &s->header;
>> +
>> + trace_ft_trans_send_header(state);
>> +
>> + hdr->cmd = s->state = state;
>> + hdr->id = s->id;
>> + hdr->seq = s->seq;
>> + hdr->payload_len = payload_len;
>> +
>> + ret = ft_trans_put(s, hdr, sizeof(*hdr));
>> + if (ret < 0) {
>> + error_report("send header failed");
>> + s->has_error = FT_TRANS_ERR_SEND_HDR;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int ft_trans_put_buffer(void *opaque, const uint8_t *buf, int64_t
>> pos, int size)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + ssize_t ret;
>> +
>> + trace_ft_trans_put_buffer(size, pos);
>> +
>> + if (s->has_error) {
>> + error_report("put_buffer when error %d, bailing", s->has_error);
>> + return -EINVAL;
>> + }
>> +
>> + /* assuming qemu_file_put_notify() is calling */
>> + if (pos == 0 && size == 0) {
>> + trace_ft_trans_put_ready();
>> + ft_trans_flush(s);
>> +
>> + if (!s->freeze_output) {
>> + trace_ft_trans_cb(s->put_ready);
>> + ret = s->put_ready();
>> + }
>> +
>> + ret = 0;
>> + goto out;
>> + }
>> +
>> + ret = ft_trans_send_header(s, QEMU_VM_TRANSACTION_CONTINUE, size);
>> + if (ret < 0) {
>> + goto out;
>> + }
>> +
>> + ret = ft_trans_put(s, (uint8_t *)buf, size);
>> + if (ret < 0) {
>> + error_report("send palyload failed");
>> + s->has_error = FT_TRANS_ERR_SEND_PAYLOAD;
>> + goto out;
>> + }
>> +
>> + s->seq++;
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +static int ft_trans_fill_buffer(void *opaque, void *buf, int size)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + size_t offset = 0;
>> + ssize_t len;
>> +
>> + s->freeze_input = 0;
>> +
>> + while (offset < size) {
>> + len = s->get_buffer(s->opaque, (uint8_t *)buf + offset,
>> + 0, size - offset);
>> + if (len == -EAGAIN) {
>> + trace_ft_trans_freeze_input();
>> + s->freeze_input = 1;
>> + break;
>> + }
>> +
>> + if (len <= 0) {
>> + error_report("fill buffer failed, %s", strerror(errno));
>> + s->has_error = 1;
>> + return -EINVAL;
>> + }
>> +
>> + offset += len;
>> + }
>> +
>> + return offset;
>> +}
>> +
>> +static int ft_trans_recv_header(QEMUFileFtTrans *s)
>> +{
>> + int ret;
>> + char *buf = (char *)&s->header + s->header_offset;
>> +
>> + ret = ft_trans_fill_buffer(s, buf, sizeof(FtTransHdr) -
>> s->header_offset);
>> + if (ret < 0) {
>> + error_report("recv header failed");
>> + s->has_error = FT_TRANS_ERR_RECV_HDR;
>> + goto out;
>> + }
>> +
>> + s->header_offset += ret;
>> + if (s->header_offset == sizeof(FtTransHdr)) {
>> + trace_ft_trans_recv_header(s->header.cmd);
>> + s->state = s->header.cmd;
>> + s->header_offset = 0;
>> +
>> + if (!s->is_sender) {
>> + s->id = s->header.id;
>> + s->seq = s->header.seq;
>> + }
>> + }
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +static int ft_trans_recv_payload(QEMUFileFtTrans *s)
>> +{
>> + QEMUFile *f = s->file;
>> + int ret = -1;
>> +
>> + /* extend QEMUFile buf if there weren't enough space */
>> + if (s->header.payload_len > (s->buf_max_size - s->get_offset)) {
>> + s->buf_max_size += (s->header.payload_len -
>> + (s->buf_max_size - s->get_offset));
>> + s->buf = qemu_realloc_buffer(f, s->buf_max_size);
>> + }
>> +
>> + ret = ft_trans_fill_buffer(s, s->buf + s->get_offset,
>> + s->header.payload_len);
>> + if (ret < 0) {
>> + error_report("recv payload failed");
>> + s->has_error = FT_TRANS_ERR_RECV_PAYLOAD;
>> + goto out;
>> + }
>> +
>> + trace_ft_trans_recv_payload(ret, s->header.payload_len,
>> s->get_offset);
>> +
>> + s->header.payload_len -= ret;
>> + s->get_offset += ret;
>> + s->is_payload = !!s->header.payload_len;
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +static int ft_trans_recv(QEMUFileFtTrans *s)
>> +{
>> + int ret;
>> +
>> + /* get payload and return */
>> + if (s->is_payload) {
>> + ret = ft_trans_recv_payload(s);
>> + goto out;
>> + }
>> +
>> + ret = ft_trans_recv_header(s);
>> + if (ret < 0 || s->freeze_input) {
>> + goto out;
>> + }
>> +
>> + switch (s->state) {
>> + case QEMU_VM_TRANSACTION_BEGIN:
>> + /* CONTINUE or COMMIT should come shortly */
>> + s->is_payload = 0;
>> + break;
>> +
>> + case QEMU_VM_TRANSACTION_CONTINUE:
>> + /* get payload */
>> + s->is_payload = 1;
>> + break;
>> +
>> + case QEMU_VM_TRANSACTION_COMMIT:
>> + ret = ft_trans_send_header(s, QEMU_VM_TRANSACTION_ACK, 0);
>> + if (ret < 0) {
>> + goto out;
>> + }
>> +
>> + trace_ft_trans_cb(s->get_ready);
>> + ret = s->get_ready(s->opaque);
>> + if (ret < 0) {
>> + goto out;
>> + }
>> +
>> + qemu_clear_buffer(s->file);
>> + s->get_offset = 0;
>> + s->is_payload = 0;
>> +
>> + break;
>> +
>> + case QEMU_VM_TRANSACTION_ATOMIC:
>> + /* not implemented yet */
>> + error_report("QEMU_VM_TRANSACTION_ATOMIC not implemented. %d",
>> + ret);
>> + break;
>> +
>> + case QEMU_VM_TRANSACTION_CANCEL:
>> + /* return -EINVAL until migrate cancel on recevier side is
>> supported */
>> + ret = -EINVAL;
>> + break;
>> +
>> + default:
>> + error_report("unknown QEMU_VM_TRANSACTION_STATE %d", ret);
>> + s->has_error = FT_TRANS_ERR_STATE_INVALID;
>> + ret = -EINVAL;
>> + }
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +static int ft_trans_get_buffer(void *opaque, uint8_t *buf,
>> + int64_t pos, int size)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + int ret;
>> +
>> + if (s->has_error) {
>> + error_report("get_buffer when error %d, bailing", s->has_error);
>> + return -EINVAL;
>> + }
>> +
>> + /* assuming qemu_file_get_notify() is calling */
>> + if (pos == 0 && size == 0) {
>> + trace_ft_trans_get_ready();
>> + s->freeze_input = 0;
>> +
>> + /* sender should be waiting for ACK */
>> + if (s->is_sender) {
>> + ret = ft_trans_recv_header(s);
>> + if (s->freeze_input) {
>> + ret = 0;
>> + goto out;
>> + }
>> + if (ret < 0) {
>> + error_report("recv ack failed");
>> + goto out;
>> + }
>> +
>> + if (s->state != QEMU_VM_TRANSACTION_ACK) {
>> + error_report("recv invalid state %d", s->state);
>> + s->has_error = FT_TRANS_ERR_STATE_INVALID;
>> + ret = -EINVAL;
>> + goto out;
>> + }
>> +
>> + trace_ft_trans_cb(s->get_ready);
>> + ret = s->get_ready(s->opaque);
>> + if (ret < 0) {
>> + goto out;
>> + }
>> +
>> + /* proceed trans id */
>> + s->id++;
>> +
>> + return 0;
>> + }
>> +
>> + /* set QEMUFile buf at beginning */
>> + if (!s->buf) {
>> + s->buf = buf;
>> + }
>> +
>> + ret = ft_trans_recv(s);
>> + goto out;
>> + }
>> +
>> + ret = s->get_offset;
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +static int ft_trans_close(void *opaque)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + int ret;
>> +
>> + trace_ft_trans_close();
>> + ret = s->close(s->opaque);
>> + if (s->is_sender) {
>> + qemu_free(s->buf);
>> + }
>> + qemu_free(s);
>> +
>> + return ret;
>> +}
>> +
>> +static int ft_trans_rate_limit(void *opaque)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> +
>> + if (s->has_error) {
>> + return 0;
>> + }
>> +
>> + if (s->rate_limit && s->freeze_output) {
>> + return 1;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int64_t ft_trans_set_rate_limit(void *opaque, int64_t new_rate)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> +
>> + if (s->has_error) {
>> + goto out;
>> + }
>> +
>> + s->rate_limit = !!new_rate;
>> +
>> +out:
>> + return s->rate_limit;
>> +}
>> +
>> +int ft_trans_begin(void *opaque)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + int ret;
>> + s->seq = 0;
>> +
>> + /* receiver sends QEMU_VM_TRANSACTION_ACK to start transaction */
>> + if (!s->is_sender) {
>> + if (s->state != QEMU_VM_TRANSACTION_INIT) {
>> + error_report("invalid state %d", s->state);
>> + s->has_error = FT_TRANS_ERR_STATE_INVALID;
>> + ret = -EINVAL;
>> + }
>> +
>> + ret = ft_trans_send_header(s, QEMU_VM_TRANSACTION_ACK, 0);
>> + goto out;
>> + }
>> +
>> + /* sender waits for QEMU_VM_TRANSACTION_ACK to start transaction */
>> + if (s->state == QEMU_VM_TRANSACTION_INIT) {
>> +retry:
>> + ret = ft_trans_recv_header(s);
>> + if (s->freeze_input) {
>> + goto retry;
>> + }
>> + if (ret < 0) {
>> + error_report("recv ack failed");
>> + goto out;
>> + }
>> +
>> + if (s->state != QEMU_VM_TRANSACTION_ACK) {
>> + error_report("recv invalid state %d", s->state);
>> + s->has_error = FT_TRANS_ERR_STATE_INVALID;
>> + ret = -EINVAL;
>> + goto out;
>> + }
>> + }
>> +
>> + ret = ft_trans_send_header(s, QEMU_VM_TRANSACTION_BEGIN, 0);
>> + if (ret < 0) {
>> + goto out;
>> + }
>> +
>> + s->state = QEMU_VM_TRANSACTION_CONTINUE;
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +int ft_trans_commit(void *opaque)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> + int ret;
>> +
>> + if (!s->is_sender) {
>> + ret = ft_trans_send_header(s, QEMU_VM_TRANSACTION_ACK, 0);
>> + goto out;
>> + }
>> +
>> + /* sender should flush buf before sending COMMIT */
>> + qemu_fflush(s->file);
>> +
>> + ret = ft_trans_send_header(s, QEMU_VM_TRANSACTION_COMMIT, 0);
>> + if (ret < 0) {
>> + goto out;
>> + }
>> +
>> + while (!s->has_error && s->put_offset) {
>> + ft_trans_flush(s);
>> + if (s->freeze_output) {
>> + s->wait_for_unfreeze(s);
>> + }
>> + }
>> +
>> + if (s->has_error) {
>> + ret = -EINVAL;
>> + goto out;
>> + }
>> +
>> + ret = ft_trans_recv_header(s);
>> + if (s->freeze_input) {
>> + ret = -EAGAIN;
>> + goto out;
>> + }
>> + if (ret < 0) {
>> + error_report("recv ack failed");
>> + goto out;
>> + }
>> +
>> + if (s->state != QEMU_VM_TRANSACTION_ACK) {
>> + error_report("recv invalid state %d", s->state);
>> + s->has_error = FT_TRANS_ERR_STATE_INVALID;
>> + ret = -EINVAL;
>> + goto out;
>> + }
>> +
>> + s->id++;
>> + ret = 0;
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +int ft_trans_cancel(void *opaque)
>> +{
>> + QEMUFileFtTrans *s = opaque;
>> +
>> + /* invalid until migrate cancel on recevier side is supported */
>> + if (!s->is_sender) {
>> + return -EINVAL;
>> + }
>> +
>> + return ft_trans_send_header(s, QEMU_VM_TRANSACTION_CANCEL, 0);
>> +}
>> +
>> +QEMUFile *qemu_fopen_ops_ft_trans(void *opaque,
>> + FtTransPutBufferFunc *put_buffer,
>> + FtTransGetBufferFunc *get_buffer,
>> + FtTransPutReadyFunc *put_ready,
>> + FtTransGetReadyFunc *get_ready,
>> + FtTransWaitForUnfreezeFunc
>> *wait_for_unfreeze,
>> + FtTransCloseFunc *close,
>> + bool is_sender)
>> +{
>> + QEMUFileFtTrans *s;
>> +
>> + s = qemu_mallocz(sizeof(*s));
>> +
>> + s->opaque = opaque;
>> + s->put_buffer = put_buffer;
>> + s->get_buffer = get_buffer;
>> + s->put_ready = put_ready;
>> + s->get_ready = get_ready;
>> + s->wait_for_unfreeze = wait_for_unfreeze;
>> + s->close = close;
>> + s->is_sender = is_sender;
>> + s->id = 0;
>> + s->seq = 0;
>> + s->rate_limit = 1;
>> +
>> + if (!s->is_sender) {
>> + s->buf_max_size = IO_BUF_SIZE;
>> + }
>> +
>> + s->file = qemu_fopen_ops(s, ft_trans_put_buffer, ft_trans_get_buffer,
>> + ft_trans_close, ft_trans_rate_limit,
>> + ft_trans_set_rate_limit, NULL);
>> +
>> + return s->file;
>> +}
>> diff --git a/ft_trans_file.h b/ft_trans_file.h
>> new file mode 100644
>> index 0000000..5ca6b53
>> --- /dev/null
>> +++ b/ft_trans_file.h
>> @@ -0,0 +1,72 @@
>> +/*
>> + * Fault tolerant VM transaction QEMUFile
>> + *
>> + * Copyright (c) 2010 Nippon Telegraph and Telephone Corporation.
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2. See
>> + * the COPYING file in the top-level directory.
>> + *
>> + * This source code is based on buffered_file.h.
>> + * Copyright IBM, Corp. 2008
>> + * Authors:
>> + * Anthony Liguori <aliguori@xxxxxxxxxx>
>> + */
>> +
>> +#ifndef QEMU_FT_TRANSACTION_FILE_H
>> +#define QEMU_FT_TRANSACTION_FILE_H
>> +
>> +#include "hw/hw.h"
>> +
>> +enum QEMU_VM_TRANSACTION_STATE {
>> + QEMU_VM_TRANSACTION_NACK = -1,
>> + QEMU_VM_TRANSACTION_INIT,
>> + QEMU_VM_TRANSACTION_BEGIN,
>> + QEMU_VM_TRANSACTION_CONTINUE,
>> + QEMU_VM_TRANSACTION_COMMIT,
>> + QEMU_VM_TRANSACTION_CANCEL,
>> + QEMU_VM_TRANSACTION_ATOMIC,
>> + QEMU_VM_TRANSACTION_ACK,
>> +};
>> +
>> +enum FT_MODE {
>> + FT_ERROR = -1,
>> + FT_OFF,
>> + FT_INIT,
>> + FT_TRANSACTION_BEGIN,
>> + FT_TRANSACTION_ITER,
>> + FT_TRANSACTION_COMMIT,
>> + FT_TRANSACTION_ATOMIC,
>> + FT_TRANSACTION_RECV,
>> +};
>> +extern enum FT_MODE ft_mode;
>> +
>> +#define FT_TRANS_ERR_UNKNOWN 0x01 /* Unknown error */
>> +#define FT_TRANS_ERR_SEND_HDR 0x02 /* Send header failed */
>> +#define FT_TRANS_ERR_RECV_HDR 0x03 /* Recv header failed */
>> +#define FT_TRANS_ERR_SEND_PAYLOAD 0x04 /* Send payload failed */
>> +#define FT_TRANS_ERR_RECV_PAYLOAD 0x05 /* Recv payload failed */
>> +#define FT_TRANS_ERR_FLUSH 0x06 /* Flush buffered data failed */
>> +#define FT_TRANS_ERR_STATE_INVALID 0x07 /* Invalid state */
>> +
>> +typedef ssize_t (FtTransPutBufferFunc)(void *opaque, const void *data,
>> size_t size);
>> +typedef int (FtTransGetBufferFunc)(void *opaque, uint8_t *buf, int64_t
>> pos, size_t size);
>> +typedef ssize_t (FtTransPutVectorFunc)(void *opaque, const struct iovec
>> *iov, int iovcnt);
>> +typedef int (FtTransPutReadyFunc)(void);
>> +typedef int (FtTransGetReadyFunc)(void *opaque);
>> +typedef void (FtTransWaitForUnfreezeFunc)(void *opaque);
>> +typedef int (FtTransCloseFunc)(void *opaque);
>> +
>> +int ft_trans_begin(void *opaque);
>> +int ft_trans_commit(void *opaque);
>> +int ft_trans_cancel(void *opaque);
>> +
>> +QEMUFile *qemu_fopen_ops_ft_trans(void *opaque,
>> + FtTransPutBufferFunc *put_buffer,
>> + FtTransGetBufferFunc *get_buffer,
>> + FtTransPutReadyFunc *put_ready,
>> + FtTransGetReadyFunc *get_ready,
>> + FtTransWaitForUnfreezeFunc
>> *wait_for_unfreeze,
>> + FtTransCloseFunc *close,
>> + bool is_sender);
>> +
>> +#endif
>> diff --git a/migration.c b/migration.c
>> index dd3bf94..c5e0146 100644
>> --- a/migration.c
>> +++ b/migration.c
>> @@ -15,6 +15,7 @@
>> #include "migration.h"
>> #include "monitor.h"
>> #include "buffered_file.h"
>> +#include "ft_trans_file.h"
>> #include "sysemu.h"
>> #include "block.h"
>> #include "qemu_socket.h"
>> @@ -31,6 +32,8 @@
>> do { } while (0)
>> #endif
>>
>> +enum FT_MODE ft_mode = FT_OFF;
>> +
>> /* Migration speed throttling */
>> static int64_t max_throttle = (32 << 20);
>>
>> diff --git a/trace-events b/trace-events
>> index e6138ea..50ac840 100644
>> --- a/trace-events
>> +++ b/trace-events
>> @@ -254,3 +254,18 @@ disable spice_vmc_write(ssize_t out, int len) "spice
>> wrottn %lu of requested %zd
>> disable spice_vmc_read(int bytes, int len) "spice read %lu of requested
>> %zd"
>> disable spice_vmc_register_interface(void *scd) "spice vmc registered
>> interface %p"
>> disable spice_vmc_unregister_interface(void *scd) "spice vmc unregistered
>> interface %p"
>> +
>> +# ft_trans_file.c
>> +disable ft_trans_realloc(size_t old_size, size_t new_size) "increasing
>> buffer from %zu by %zu"
>> +disable ft_trans_append(size_t size) "buffering %zu bytes"
>> +disable ft_trans_flush(size_t size, size_t req) "flushed %zu of %zu
>> bytes"
>> +disable ft_trans_send_header(uint16_t cmd) "send header %d"
>> +disable ft_trans_recv_header(uint16_t cmd) "recv header %d"
>> +disable ft_trans_put_buffer(size_t size, int64_t pos) "putting %d bytes
>> at %"PRId64""
>> +disable ft_trans_recv_payload(size_t len, uint32_t hdr, size_t total)
>> "recv %d of %d total %d"
>> +disable ft_trans_close(void) "closing"
>> +disable ft_trans_freeze_output(void) "backend not ready, freezing output"
>> +disable ft_trans_freeze_input(void) "backend not ready, freezing input"
>> +disable ft_trans_put_ready(void) "file is ready to put"
>> +disable ft_trans_get_ready(void) "file is ready to get"
>> +disable ft_trans_cb(void *cb) "callback %p"
>> --
>> 1.7.1.2
>>
>> --
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