Yokshiaki:
event-tap record block and io wirte events, and replay these on
the other side, so block_save_live is useless during the latter ft
phase, right? if so, I think it need to process the following code in
block_save_live function:
if (stage == 1) {
init_blk_migration(mon, f);
/* start track dirty blocks */
set_dirty_tracking(1);
}
--------------------------------------
the following code will send block to the other side, as this will
also be done by event-tap replay. I think it should placed in stage 3,
before the assert line. (this may affect some stage 2 rate-limit
then, so this can be placed in stage 2, though it looks ugly), another
choice is to avoid the invocation of block_save_live, right?
---------------------------------------
flush_blks(f);
if (qemu_file_has_error(f)) {
blk_mig_cleanup(mon);
return 0;
}
blk_mig_reset_dirty_cursor();
----------------------------------------
if (stage == 2) {
another question is: since you event-tap io write(I think IO READ
should also be event-tapped, as read may cause io chip state to
change), you then need not invoke qemu_savevm_state_full in
qemu_savevm_trans_complete, right? thanks.
Green.
2011/2/24 Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>:
> event-tap controls when to start FT transaction, and provides proxy
> functions to called from net/block devices. While FT transaction, it
> queues up net/block requests, and flush them when the transaction gets
> completed.
>
> Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
> Signed-off-by: OHMURA Kei <ohmura.kei@xxxxxxxxxxxxx>
> ---
> Makefile.target | 1 +
> event-tap.c | 940 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> event-tap.h | 44 +++
> qemu-tool.c | 28 ++
> trace-events | 10 +
> 5 files changed, 1023 insertions(+), 0 deletions(-)
> create mode 100644 event-tap.c
> create mode 100644 event-tap.h
>
> diff --git a/Makefile.target b/Makefile.target
> index 220589e..da57efe 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -199,6 +199,7 @@ obj-y += rwhandler.o
> obj-$(CONFIG_KVM) += kvm.o kvm-all.o
> obj-$(CONFIG_NO_KVM) += kvm-stub.o
> LIBS+=-lz
> +obj-y += event-tap.o
>
> QEMU_CFLAGS += $(VNC_TLS_CFLAGS)
> QEMU_CFLAGS += $(VNC_SASL_CFLAGS)
> diff --git a/event-tap.c b/event-tap.c
> new file mode 100644
> index 0000000..95c147a
> --- /dev/null
> +++ b/event-tap.c
> @@ -0,0 +1,940 @@
> +/*
> + * Event Tap functions for QEMU
> + *
> + * 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.
> + */
> +
> +#include "qemu-common.h"
> +#include "qemu-error.h"
> +#include "block.h"
> +#include "block_int.h"
> +#include "ioport.h"
> +#include "osdep.h"
> +#include "sysemu.h"
> +#include "hw/hw.h"
> +#include "net.h"
> +#include "event-tap.h"
> +#include "trace.h"
> +
> +enum EVENT_TAP_STATE {
> + EVENT_TAP_OFF,
> + EVENT_TAP_ON,
> + EVENT_TAP_SUSPEND,
> + EVENT_TAP_FLUSH,
> + EVENT_TAP_LOAD,
> + EVENT_TAP_REPLAY,
> +};
> +
> +static enum EVENT_TAP_STATE event_tap_state = EVENT_TAP_OFF;
> +
> +typedef struct EventTapIOport {
> + uint32_t address;
> + uint32_t data;
> + int index;
> +} EventTapIOport;
> +
> +#define MMIO_BUF_SIZE 8
> +
> +typedef struct EventTapMMIO {
> + uint64_t address;
> + uint8_t buf[MMIO_BUF_SIZE];
> + int len;
> +} EventTapMMIO;
> +
> +typedef struct EventTapNetReq {
> + char *device_name;
> + int iovcnt;
> + int vlan_id;
> + bool vlan_needed;
> + bool async;
> + struct iovec *iov;
> + NetPacketSent *sent_cb;
> +} EventTapNetReq;
> +
> +#define MAX_BLOCK_REQUEST 32
> +
> +typedef struct EventTapAIOCB EventTapAIOCB;
> +
> +typedef struct EventTapBlkReq {
> + char *device_name;
> + int num_reqs;
> + int num_cbs;
> + bool is_flush;
> + BlockRequest reqs[MAX_BLOCK_REQUEST];
> + EventTapAIOCB *acb[MAX_BLOCK_REQUEST];
> +} EventTapBlkReq;
> +
> +#define EVENT_TAP_IOPORT (1 << 0)
> +#define EVENT_TAP_MMIO (1 << 1)
> +#define EVENT_TAP_NET (1 << 2)
> +#define EVENT_TAP_BLK (1 << 3)
> +
> +#define EVENT_TAP_TYPE_MASK (EVENT_TAP_NET - 1)
> +
> +typedef struct EventTapLog {
> + int mode;
> + union {
> + EventTapIOport ioport;
> + EventTapMMIO mmio;
> + };
> + union {
> + EventTapNetReq net_req;
> + EventTapBlkReq blk_req;
> + };
> + QTAILQ_ENTRY(EventTapLog) node;
> +} EventTapLog;
> +
> +struct EventTapAIOCB {
> + BlockDriverAIOCB common;
> + BlockDriverAIOCB *acb;
> + bool is_canceled;
> +};
> +
> +static EventTapLog *last_event_tap;
> +
> +static QTAILQ_HEAD(, EventTapLog) event_list;
> +static QTAILQ_HEAD(, EventTapLog) event_pool;
> +
> +static int (*event_tap_cb)(void);
> +static QEMUBH *event_tap_bh;
> +static VMChangeStateEntry *vmstate;
> +
> +static void event_tap_bh_cb(void *p)
> +{
> + if (event_tap_cb) {
> + event_tap_cb();
> + }
> +
> + qemu_bh_delete(event_tap_bh);
> + event_tap_bh = NULL;
> +}
> +
> +static void event_tap_schedule_bh(void)
> +{
> + trace_event_tap_ignore_bh(!!event_tap_bh);
> +
> + /* if bh is already set, we ignore it for now */
> + if (event_tap_bh) {
> + return;
> + }
> +
> + event_tap_bh = qemu_bh_new(event_tap_bh_cb, NULL);
> + qemu_bh_schedule(event_tap_bh);
> +
> + return;
> +}
> +
> +static void *event_tap_alloc_log(void)
> +{
> + EventTapLog *log;
> +
> + if (QTAILQ_EMPTY(&event_pool)) {
> + log = qemu_mallocz(sizeof(EventTapLog));
> + } else {
> + log = QTAILQ_FIRST(&event_pool);
> + QTAILQ_REMOVE(&event_pool, log, node);
> + }
> +
> + return log;
> +}
> +
> +static void event_tap_free_net_req(EventTapNetReq *net_req);
> +static void event_tap_free_blk_req(EventTapBlkReq *blk_req);
> +
> +static void event_tap_free_log(EventTapLog *log)
> +{
> + int mode = log->mode & ~EVENT_TAP_TYPE_MASK;
> +
> + if (mode == EVENT_TAP_NET) {
> + event_tap_free_net_req(&log->net_req);
> + } else if (mode == EVENT_TAP_BLK) {
> + event_tap_free_blk_req(&log->blk_req);
> + }
> +
> + log->mode = 0;
> +
> + /* return the log to event_pool */
> + QTAILQ_INSERT_HEAD(&event_pool, log, node);
> +}
> +
> +static void event_tap_free_pool(void)
> +{
> + EventTapLog *log, *next;
> +
> + QTAILQ_FOREACH_SAFE(log, &event_pool, node, next) {
> + QTAILQ_REMOVE(&event_pool, log, node);
> + qemu_free(log);
> + }
> +}
> +
> +static void event_tap_free_net_req(EventTapNetReq *net_req)
> +{
> + int i;
> +
> + if (!net_req->async) {
> + for (i = 0; i < net_req->iovcnt; i++) {
> + qemu_free(net_req->iov[i].iov_base);
> + }
> + qemu_free(net_req->iov);
> + } else if (event_tap_state >= EVENT_TAP_LOAD) {
> + qemu_free(net_req->iov);
> + }
> +
> + qemu_free(net_req->device_name);
> +}
> +
> +static void event_tap_alloc_net_req(EventTapNetReq *net_req,
> + VLANClientState *vc,
> + const struct iovec *iov, int iovcnt,
> + NetPacketSent *sent_cb, bool async)
> +{
> + int i;
> +
> + net_req->iovcnt = iovcnt;
> + net_req->async = async;
> + net_req->device_name = qemu_strdup(vc->name);
> + net_req->sent_cb = sent_cb;
> +
> + if (vc->vlan) {
> + net_req->vlan_needed = 1;
> + net_req->vlan_id = vc->vlan->id;
> + } else {
> + net_req->vlan_needed = 0;
> + }
> +
> + if (async) {
> + net_req->iov = (struct iovec *)iov;
> + } else {
> + net_req->iov = qemu_malloc(sizeof(struct iovec) * iovcnt);
> + for (i = 0; i < iovcnt; i++) {
> + net_req->iov[i].iov_base = qemu_malloc(iov[i].iov_len);
> + memcpy(net_req->iov[i].iov_base, iov[i].iov_base, iov[i].iov_len);
> + net_req->iov[i].iov_len = iov[i].iov_len;
> + }
> + }
> +}
> +
> +static void event_tap_packet(VLANClientState *vc, const struct iovec *iov,
> + int iovcnt, NetPacketSent *sent_cb, bool async)
> +{
> + int empty;
> + EventTapLog *log = last_event_tap;
> +
> + if (!log) {
> + trace_event_tap_no_event();
> + log = event_tap_alloc_log();
> + }
> +
> + if (log->mode & ~EVENT_TAP_TYPE_MASK) {
> + trace_event_tap_already_used(log->mode & ~EVENT_TAP_TYPE_MASK);
> + return;
> + }
> +
> + log->mode |= EVENT_TAP_NET;
> + event_tap_alloc_net_req(&log->net_req, vc, iov, iovcnt, sent_cb, async);
> +
> + empty = QTAILQ_EMPTY(&event_list);
> + QTAILQ_INSERT_TAIL(&event_list, log, node);
> + last_event_tap = NULL;
> +
> + if (empty) {
> + event_tap_schedule_bh();
> + }
> +}
> +
> +void event_tap_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
> +{
> + struct iovec iov;
> +
> + assert(event_tap_state == EVENT_TAP_ON);
> +
> + iov.iov_base = (uint8_t *)buf;
> + iov.iov_len = size;
> + event_tap_packet(vc, &iov, 1, NULL, 0);
> +
> + return;
> +}
> +
> +ssize_t event_tap_sendv_packet_async(VLANClientState *vc,
> + const struct iovec *iov,
> + int iovcnt, NetPacketSent *sent_cb)
> +{
> + assert(event_tap_state == EVENT_TAP_ON);
> + event_tap_packet(vc, iov, iovcnt, sent_cb, 1);
> + return 0;
> +}
> +
> +static void event_tap_net_flush(EventTapNetReq *net_req)
> +{
> + VLANClientState *vc;
> + ssize_t len;
> +
> + if (net_req->vlan_needed) {
> + vc = qemu_find_vlan_client_by_name(NULL, net_req->vlan_id,
> + net_req->device_name);
> + } else {
> + vc = qemu_find_netdev(net_req->device_name);
> + }
> +
> + if (net_req->async) {
> + len = qemu_sendv_packet_async(vc, net_req->iov, net_req->iovcnt,
> + net_req->sent_cb);
> + if (len) {
> + net_req->sent_cb(vc, len);
> + } else {
> + /* packets are queued in the net layer */
> + trace_event_tap_append_packet();
> + }
> + } else {
> + qemu_send_packet(vc, net_req->iov[0].iov_base,
> + net_req->iov[0].iov_len);
> + }
> +
> + /* force flush to avoid request inversion */
> + qemu_aio_flush();
> +}
> +
> +static void event_tap_net_save(QEMUFile *f, EventTapNetReq *net_req)
> +{
> + ram_addr_t page_addr;
> + int i, len;
> +
> + len = strlen(net_req->device_name);
> + qemu_put_byte(f, len);
> + qemu_put_buffer(f, (uint8_t *)net_req->device_name, len);
> + qemu_put_byte(f, net_req->vlan_id);
> + qemu_put_byte(f, net_req->vlan_needed);
> + qemu_put_byte(f, net_req->async);
> + qemu_put_be32(f, net_req->iovcnt);
> +
> + for (i = 0; i < net_req->iovcnt; i++) {
> + qemu_put_be64(f, net_req->iov[i].iov_len);
> + if (net_req->async) {
> + page_addr =
> + qemu_ram_addr_from_host_nofail(net_req->iov[i].iov_base);
> + qemu_put_be64(f, page_addr);
> + } else {
> + qemu_put_buffer(f, (uint8_t *)net_req->iov[i].iov_base,
> + net_req->iov[i].iov_len);
> + }
> + }
> +}
> +
> +static void event_tap_net_load(QEMUFile *f, EventTapNetReq *net_req)
> +{
> + ram_addr_t page_addr;
> + int i, len;
> +
> + len = qemu_get_byte(f);
> + net_req->device_name = qemu_malloc(len + 1);
> + qemu_get_buffer(f, (uint8_t *)net_req->device_name, len);
> + net_req->device_name[len] = '\0';
> + net_req->vlan_id = qemu_get_byte(f);
> + net_req->vlan_needed = qemu_get_byte(f);
> + net_req->async = qemu_get_byte(f);
> + net_req->iovcnt = qemu_get_be32(f);
> + net_req->iov = qemu_malloc(sizeof(struct iovec) * net_req->iovcnt);
> +
> + for (i = 0; i < net_req->iovcnt; i++) {
> + net_req->iov[i].iov_len = qemu_get_be64(f);
> + if (net_req->async) {
> + page_addr = qemu_get_be64(f);
> + net_req->iov[i].iov_base = qemu_get_ram_ptr(page_addr);
> + } else {
> + net_req->iov[i].iov_base = qemu_malloc(net_req->iov[i].iov_len);
> + qemu_get_buffer(f, (uint8_t *)net_req->iov[i].iov_base,
> + net_req->iov[i].iov_len);
> + }
> + }
> +}
> +
> +static void event_tap_free_blk_req(EventTapBlkReq *blk_req)
> +{
> + int i;
> +
> + if (event_tap_state >= EVENT_TAP_LOAD && !blk_req->is_flush) {
> + for (i = 0; i < blk_req->num_reqs; i++) {
> + qemu_iovec_destroy(blk_req->reqs[i].qiov);
> + qemu_free(blk_req->reqs[i].qiov);
> + }
> + }
> +
> + qemu_free(blk_req->device_name);
> +}
> +
> +static void event_tap_blk_cb(void *opaque, int ret)
> +{
> + EventTapLog *log = container_of(opaque, EventTapLog, blk_req);
> + EventTapBlkReq *blk_req = opaque;
> + int i;
> +
> + blk_req->num_cbs--;
> +
> + /* all outstanding requests are flushed */
> + if (blk_req->num_cbs == 0) {
> + for (i = 0; i < blk_req->num_reqs; i++) {
> + EventTapAIOCB *eacb = blk_req->acb[i];
> + eacb->common.cb(eacb->common.opaque, ret);
> + qemu_aio_release(eacb);
> + }
> +
> + event_tap_free_log(log);
> + }
> +}
> +
> +static void event_tap_bdrv_aio_cancel(BlockDriverAIOCB *acb)
> +{
> + EventTapAIOCB *eacb = container_of(acb, EventTapAIOCB, common);
> +
> + /* check if already passed to block layer */
> + if (eacb->acb) {
> + bdrv_aio_cancel(eacb->acb);
> + } else {
> + eacb->is_canceled = 1;
> + }
> +}
> +
> +static AIOPool event_tap_aio_pool = {
> + .aiocb_size = sizeof(EventTapAIOCB),
> + .cancel = event_tap_bdrv_aio_cancel,
> +};
> +
> +static void event_tap_alloc_blk_req(EventTapBlkReq *blk_req,
> + BlockDriverState *bs, BlockRequest *reqs,
> + int num_reqs, void *opaque, bool is_flush)
> +{
> + int i;
> +
> + blk_req->num_reqs = num_reqs;
> + blk_req->num_cbs = num_reqs;
> + blk_req->device_name = qemu_strdup(bs->device_name);
> + blk_req->is_flush = is_flush;
> +
> + for (i = 0; i < num_reqs; i++) {
> + blk_req->reqs[i].sector = reqs[i].sector;
> + blk_req->reqs[i].nb_sectors = reqs[i].nb_sectors;
> + blk_req->reqs[i].qiov = reqs[i].qiov;
> + blk_req->reqs[i].cb = event_tap_blk_cb;
> + blk_req->reqs[i].opaque = opaque;
> +
> + blk_req->acb[i] = qemu_aio_get(&event_tap_aio_pool, bs,
> + reqs[i].cb, reqs[i].opaque);
> + }
> +}
> +
> +static EventTapBlkReq *event_tap_bdrv(BlockDriverState *bs, BlockRequest *reqs,
> + int num_reqs, bool is_flush)
> +{
> + EventTapLog *log = last_event_tap;
> + int empty;
> +
> + if (!log) {
> + trace_event_tap_no_event();
> + log = event_tap_alloc_log();
> + }
> +
> + if (log->mode & ~EVENT_TAP_TYPE_MASK) {
> + trace_event_tap_already_used(log->mode & ~EVENT_TAP_TYPE_MASK);
> + return NULL;
> + }
> +
> + log->mode |= EVENT_TAP_BLK;
> + event_tap_alloc_blk_req(&log->blk_req, bs, reqs,
> + num_reqs, &log->blk_req, is_flush);
> +
> + empty = QTAILQ_EMPTY(&event_list);
> + QTAILQ_INSERT_TAIL(&event_list, log, node);
> + last_event_tap = NULL;
> +
> + if (empty) {
> + event_tap_schedule_bh();
> + }
> +
> + return &log->blk_req;
> +}
> +
> +BlockDriverAIOCB *event_tap_bdrv_aio_writev(BlockDriverState *bs,
> + int64_t sector_num,
> + QEMUIOVector *iov,
> + int nb_sectors,
> + BlockDriverCompletionFunc *cb,
> + void *opaque)
> +{
> + BlockRequest req;
> + EventTapBlkReq *ereq;
> +
> + assert(event_tap_state == EVENT_TAP_ON);
> +
> + req.sector = sector_num;
> + req.nb_sectors = nb_sectors;
> + req.qiov = iov;
> + req.cb = cb;
> + req.opaque = opaque;
> + ereq = event_tap_bdrv(bs, &req, 1, 0);
> +
> + return &ereq->acb[0]->common;
> +}
> +
> +BlockDriverAIOCB *event_tap_bdrv_aio_flush(BlockDriverState *bs,
> + BlockDriverCompletionFunc *cb,
> + void *opaque)
> +{
> + BlockRequest req;
> + EventTapBlkReq *ereq;
> +
> + assert(event_tap_state == EVENT_TAP_ON);
> +
> + memset(&req, 0, sizeof(req));
> + req.cb = cb;
> + req.opaque = opaque;
> + ereq = event_tap_bdrv(bs, &req, 1, 1);
> +
> + return &ereq->acb[0]->common;
> +}
> +
> +void event_tap_bdrv_flush(void)
> +{
> + qemu_bh_cancel(event_tap_bh);
> +
> + while (!QTAILQ_EMPTY(&event_list)) {
> + event_tap_cb();
> + }
> +}
> +
> +static void event_tap_blk_flush(EventTapBlkReq *blk_req)
> +{
> + int i, ret;
> +
> + for (i = 0; i < blk_req->num_reqs; i++) {
> + BlockRequest *req = &blk_req->reqs[i];
> + EventTapAIOCB *eacb = blk_req->acb[i];
> + BlockDriverAIOCB *acb = &eacb->common;
> +
> + /* don't flush if canceled */
> + if (eacb->is_canceled) {
> + continue;
> + }
> +
> + /* receiver needs to restore bs from device name */
> + if (!acb->bs) {
> + acb->bs = bdrv_find(blk_req->device_name);
> + }
> +
> + if (blk_req->is_flush) {
> + eacb->acb = bdrv_aio_flush(acb->bs, req->cb, req->opaque);
> + if (!eacb->acb) {
> + req->cb(req->opaque, -EIO);
> + }
> + return;
> + }
> +
> + eacb->acb = bdrv_aio_writev(acb->bs, req->sector, req->qiov,
> + req->nb_sectors, req->cb, req->opaque);
> + if (!eacb->acb) {
> + req->cb(req->opaque, -EIO);
> + }
> +
> + /* force flush to avoid request inversion */
> + qemu_aio_flush();
> + ret = bdrv_flush(acb->bs);
> + if (ret < 0) {
> + error_report("flushing blk_req to %s failed", blk_req->device_name);
> + }
> + }
> +}
> +
> +static void event_tap_blk_save(QEMUFile *f, EventTapBlkReq *blk_req)
> +{
> + ram_addr_t page_addr;
> + int i, j, len;
> +
> + len = strlen(blk_req->device_name);
> + qemu_put_byte(f, len);
> + qemu_put_buffer(f, (uint8_t *)blk_req->device_name, len);
> + qemu_put_byte(f, blk_req->num_reqs);
> + qemu_put_byte(f, blk_req->is_flush);
> +
> + if (blk_req->is_flush) {
> + return;
> + }
> +
> + for (i = 0; i < blk_req->num_reqs; i++) {
> + BlockRequest *req = &blk_req->reqs[i];
> + EventTapAIOCB *eacb = blk_req->acb[i];
> + /* don't save canceled requests */
> + if (eacb->is_canceled) {
> + continue;
> + }
> + qemu_put_be64(f, req->sector);
> + qemu_put_be32(f, req->nb_sectors);
> + qemu_put_be32(f, req->qiov->niov);
> +
> + for (j = 0; j < req->qiov->niov; j++) {
> + page_addr =
> + qemu_ram_addr_from_host_nofail(req->qiov->iov[j].iov_base);
> + qemu_put_be64(f, page_addr);
> + qemu_put_be64(f, req->qiov->iov[j].iov_len);
> + }
> + }
> +}
> +
> +static void event_tap_blk_load(QEMUFile *f, EventTapBlkReq *blk_req)
> +{
> + BlockRequest *req;
> + ram_addr_t page_addr;
> + int i, j, len, niov;
> +
> + len = qemu_get_byte(f);
> + blk_req->device_name = qemu_malloc(len + 1);
> + qemu_get_buffer(f, (uint8_t *)blk_req->device_name, len);
> + blk_req->device_name[len] = '\0';
> + blk_req->num_reqs = qemu_get_byte(f);
> + blk_req->is_flush = qemu_get_byte(f);
> +
> + if (blk_req->is_flush) {
> + return;
> + }
> +
> + for (i = 0; i < blk_req->num_reqs; i++) {
> + req = &blk_req->reqs[i];
> + req->sector = qemu_get_be64(f);
> + req->nb_sectors = qemu_get_be32(f);
> + req->qiov = qemu_mallocz(sizeof(QEMUIOVector));
> + niov = qemu_get_be32(f);
> + qemu_iovec_init(req->qiov, niov);
> +
> + for (j = 0; j < niov; j++) {
> + void *iov_base;
> + size_t iov_len;
> + page_addr = qemu_get_be64(f);
> + iov_base = qemu_get_ram_ptr(page_addr);
> + iov_len = qemu_get_be64(f);
> + qemu_iovec_add(req->qiov, iov_base, iov_len);
> + }
> + }
> +}
> +
> +void event_tap_ioport(int index, uint32_t address, uint32_t data)
> +{
> + if (event_tap_state != EVENT_TAP_ON) {
> + return;
> + }
> +
> + if (!last_event_tap) {
> + last_event_tap = event_tap_alloc_log();
> + }
> +
> + last_event_tap->mode = EVENT_TAP_IOPORT;
> + last_event_tap->ioport.index = index;
> + last_event_tap->ioport.address = address;
> + last_event_tap->ioport.data = data;
> +}
> +
> +static inline void event_tap_ioport_save(QEMUFile *f, EventTapIOport *ioport)
> +{
> + qemu_put_be32(f, ioport->index);
> + qemu_put_be32(f, ioport->address);
> + qemu_put_byte(f, ioport->data);
> +}
> +
> +static inline void event_tap_ioport_load(QEMUFile *f,
> + EventTapIOport *ioport)
> +{
> + ioport->index = qemu_get_be32(f);
> + ioport->address = qemu_get_be32(f);
> + ioport->data = qemu_get_byte(f);
> +}
> +
> +void event_tap_mmio(uint64_t address, uint8_t *buf, int len)
> +{
> + if (event_tap_state != EVENT_TAP_ON || len > MMIO_BUF_SIZE) {
> + return;
> + }
> +
> + if (!last_event_tap) {
> + last_event_tap = event_tap_alloc_log();
> + }
> +
> + last_event_tap->mode = EVENT_TAP_MMIO;
> + last_event_tap->mmio.address = address;
> + last_event_tap->mmio.len = len;
> + memcpy(last_event_tap->mmio.buf, buf, len);
> +}
> +
> +static inline void event_tap_mmio_save(QEMUFile *f, EventTapMMIO *mmio)
> +{
> + qemu_put_be64(f, mmio->address);
> + qemu_put_byte(f, mmio->len);
> + qemu_put_buffer(f, mmio->buf, mmio->len);
> +}
> +
> +static inline void event_tap_mmio_load(QEMUFile *f, EventTapMMIO *mmio)
> +{
> + mmio->address = qemu_get_be64(f);
> + mmio->len = qemu_get_byte(f);
> + qemu_get_buffer(f, mmio->buf, mmio->len);
> +}
> +
> +int event_tap_register(int (*cb)(void))
> +{
> + if (event_tap_state != EVENT_TAP_OFF) {
> + error_report("event-tap is already on");
> + return -EINVAL;
> + }
> +
> + if (!cb || event_tap_cb) {
> + error_report("can't set event_tap_cb");
> + return -EINVAL;
> + }
> +
> + event_tap_cb = cb;
> + event_tap_state = EVENT_TAP_ON;
> +
> + return 0;
> +}
> +
> +void event_tap_unregister(void)
> +{
> + if (event_tap_state == EVENT_TAP_OFF) {
> + error_report("event-tap is already off");
> + return;
> + }
> +
> + qemu_del_vm_change_state_handler(vmstate);
> +
> + event_tap_flush();
> + event_tap_free_pool();
> +
> + event_tap_state = EVENT_TAP_OFF;
> + event_tap_cb = NULL;
> +}
> +
> +int event_tap_is_on(void)
> +{
> + return (event_tap_state == EVENT_TAP_ON);
> +}
> +
> +static void event_tap_suspend(void *opaque, int running, int reason)
> +{
> + event_tap_state = running ? EVENT_TAP_ON : EVENT_TAP_SUSPEND;
> +}
> +
> +/* returns 1 if the queue gets emtpy */
> +int event_tap_flush_one(void)
> +{
> + EventTapLog *log;
> + int ret;
> +
> + if (QTAILQ_EMPTY(&event_list)) {
> + return 1;
> + }
> +
> + event_tap_state = EVENT_TAP_FLUSH;
> +
> + log = QTAILQ_FIRST(&event_list);
> + QTAILQ_REMOVE(&event_list, log, node);
> + switch (log->mode & ~EVENT_TAP_TYPE_MASK) {
> + case EVENT_TAP_NET:
> + event_tap_net_flush(&log->net_req);
> + event_tap_free_log(log);
> + break;
> + case EVENT_TAP_BLK:
> + event_tap_blk_flush(&log->blk_req);
> + break;
> + default:
> + error_report("Unknown state %d", log->mode);
> + event_tap_free_log(log);
> + return -EINVAL;
> + }
> +
> + ret = QTAILQ_EMPTY(&event_list);
> + event_tap_state = ret ? EVENT_TAP_ON : EVENT_TAP_FLUSH;
> +
> + return ret;
> +}
> +
> +void event_tap_flush(void)
> +{
> + int ret;
> +
> + do {
> + ret = event_tap_flush_one();
> + } while (ret == 0);
> +
> + if (ret < 0) {
> + error_report("error flushing event-tap requests");
> + abort();
> + }
> +}
> +
> +static void event_tap_replay(void *opaque, int running, int reason)
> +{
> + EventTapLog *log, *next;
> +
> + if (!running) {
> + return;
> + }
> +
> + assert(event_tap_state == EVENT_TAP_LOAD);
> +
> + event_tap_state = EVENT_TAP_REPLAY;
> +
> + QTAILQ_FOREACH(log, &event_list, node) {
> + if ((log->mode & ~EVENT_TAP_TYPE_MASK) == EVENT_TAP_NET) {
> + EventTapNetReq *net_req = &log->net_req;
> + if (!net_req->async) {
> + event_tap_net_flush(net_req);
> + continue;
> + }
> + }
> +
> + switch (log->mode & EVENT_TAP_TYPE_MASK) {
> + case EVENT_TAP_IOPORT:
> + switch (log->ioport.index) {
> + case 0:
> + cpu_outb(log->ioport.address, log->ioport.data);
> + break;
> + case 1:
> + cpu_outw(log->ioport.address, log->ioport.data);
> + break;
> + case 2:
> + cpu_outl(log->ioport.address, log->ioport.data);
> + break;
> + }
> + break;
> + case EVENT_TAP_MMIO:
> + cpu_physical_memory_rw(log->mmio.address,
> + log->mmio.buf,
> + log->mmio.len, 1);
> + break;
> + case 0:
> + trace_event_tap_replay_no_event();
> + break;
> + default:
> + error_report("Unknown state %d", log->mode);
> + QTAILQ_REMOVE(&event_list, log, node);
> + event_tap_free_log(log);
> + return;
> + }
> + }
> +
> + /* remove event logs from queue */
> + QTAILQ_FOREACH_SAFE(log, &event_list, node, next) {
> + QTAILQ_REMOVE(&event_list, log, node);
> + event_tap_free_log(log);
> + }
> +
> + event_tap_state = EVENT_TAP_OFF;
> + qemu_del_vm_change_state_handler(vmstate);
> +}
> +
> +static void event_tap_save(QEMUFile *f, void *opaque)
> +{
> + EventTapLog *log;
> +
> + QTAILQ_FOREACH(log, &event_list, node) {
> + qemu_put_byte(f, log->mode);
> +
> + switch (log->mode & EVENT_TAP_TYPE_MASK) {
> + case EVENT_TAP_IOPORT:
> + event_tap_ioport_save(f, &log->ioport);
> + break;
> + case EVENT_TAP_MMIO:
> + event_tap_mmio_save(f, &log->mmio);
> + break;
> + case 0:
> + trace_event_tap_save_no_event();
> + break;
> + default:
> + error_report("Unknown state %d", log->mode);
> + return;
> + }
> +
> + switch (log->mode & ~EVENT_TAP_TYPE_MASK) {
> + case EVENT_TAP_NET:
> + event_tap_net_save(f, &log->net_req);
> + break;
> + case EVENT_TAP_BLK:
> + event_tap_blk_save(f, &log->blk_req);
> + break;
> + default:
> + error_report("Unknown state %d", log->mode);
> + return;
> + }
> + }
> +
> + qemu_put_byte(f, 0); /* EOF */
> +}
> +
> +static int event_tap_load(QEMUFile *f, void *opaque, int version_id)
> +{
> + EventTapLog *log, *next;
> + int mode;
> +
> + event_tap_state = EVENT_TAP_LOAD;
> +
> + QTAILQ_FOREACH_SAFE(log, &event_list, node, next) {
> + QTAILQ_REMOVE(&event_list, log, node);
> + event_tap_free_log(log);
> + }
> +
> + /* loop until EOF */
> + while ((mode = qemu_get_byte(f)) != 0) {
> + EventTapLog *log = event_tap_alloc_log();
> +
> + log->mode = mode;
> + switch (log->mode & EVENT_TAP_TYPE_MASK) {
> + case EVENT_TAP_IOPORT:
> + event_tap_ioport_load(f, &log->ioport);
> + break;
> + case EVENT_TAP_MMIO:
> + event_tap_mmio_load(f, &log->mmio);
> + break;
> + case 0:
> + trace_event_tap_load_no_event();
> + break;
> + default:
> + error_report("Unknown state %d", log->mode);
> + event_tap_free_log(log);
> + return -EINVAL;
> + }
> +
> + switch (log->mode & ~EVENT_TAP_TYPE_MASK) {
> + case EVENT_TAP_NET:
> + event_tap_net_load(f, &log->net_req);
> + break;
> + case EVENT_TAP_BLK:
> + event_tap_blk_load(f, &log->blk_req);
> + break;
> + default:
> + error_report("Unknown state %d", log->mode);
> + event_tap_free_log(log);
> + return -EINVAL;
> + }
> +
> + QTAILQ_INSERT_TAIL(&event_list, log, node);
> + }
> +
> + return 0;
> +}
> +
> +void event_tap_schedule_replay(void)
> +{
> + vmstate = qemu_add_vm_change_state_handler(event_tap_replay, NULL);
> +}
> +
> +void event_tap_schedule_suspend(void)
> +{
> + vmstate = qemu_add_vm_change_state_handler(event_tap_suspend, NULL);
> +}
> +
> +void event_tap_init(void)
> +{
> + QTAILQ_INIT(&event_list);
> + QTAILQ_INIT(&event_pool);
> + register_savevm(NULL, "event-tap", 0, 1,
> + event_tap_save, event_tap_load, &last_event_tap);
> +}
> diff --git a/event-tap.h b/event-tap.h
> new file mode 100644
> index 0000000..ab677f8
> --- /dev/null
> +++ b/event-tap.h
> @@ -0,0 +1,44 @@
> +/*
> + * Event Tap functions for QEMU
> + *
> + * 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.
> + */
> +
> +#ifndef EVENT_TAP_H
> +#define EVENT_TAP_H
> +
> +#include "qemu-common.h"
> +#include "net.h"
> +#include "block.h"
> +
> +int event_tap_register(int (*cb)(void));
> +void event_tap_unregister(void);
> +int event_tap_is_on(void);
> +void event_tap_schedule_suspend(void);
> +void event_tap_ioport(int index, uint32_t address, uint32_t data);
> +void event_tap_mmio(uint64_t address, uint8_t *buf, int len);
> +void event_tap_init(void);
> +void event_tap_flush(void);
> +int event_tap_flush_one(void);
> +void event_tap_schedule_replay(void);
> +
> +void event_tap_send_packet(VLANClientState *vc, const uint8_t *buf, int size);
> +ssize_t event_tap_sendv_packet_async(VLANClientState *vc,
> + const struct iovec *iov,
> + int iovcnt, NetPacketSent *sent_cb);
> +
> +BlockDriverAIOCB *event_tap_bdrv_aio_writev(BlockDriverState *bs,
> + int64_t sector_num,
> + QEMUIOVector *iov,
> + int nb_sectors,
> + BlockDriverCompletionFunc *cb,
> + void *opaque);
> +BlockDriverAIOCB *event_tap_bdrv_aio_flush(BlockDriverState *bs,
> + BlockDriverCompletionFunc *cb,
> + void *opaque);
> +void event_tap_bdrv_flush(void);
> +
> +#endif
> diff --git a/qemu-tool.c b/qemu-tool.c
> index 392e1c9..3f71215 100644
> --- a/qemu-tool.c
> +++ b/qemu-tool.c
> @@ -16,6 +16,7 @@
> #include "qemu-timer.h"
> #include "qemu-log.h"
> #include "sysemu.h"
> +#include "event-tap.h"
>
> #include <sys/time.h>
>
> @@ -111,3 +112,30 @@ int qemu_set_fd_handler2(int fd,
> {
> return 0;
> }
> +
> +BlockDriverAIOCB *event_tap_bdrv_aio_writev(BlockDriverState *bs,
> + int64_t sector_num,
> + QEMUIOVector *iov,
> + int nb_sectors,
> + BlockDriverCompletionFunc *cb,
> + void *opaque)
> +{
> + return NULL;
> +}
> +
> +BlockDriverAIOCB *event_tap_bdrv_aio_flush(BlockDriverState *bs,
> + BlockDriverCompletionFunc *cb,
> + void *opaque)
> +{
> + return NULL;
> +}
> +
> +void event_tap_bdrv_flush(void)
> +{
> +}
> +
> +int event_tap_is_on(void)
> +{
> + return 0;
> +}
> +
> diff --git a/trace-events b/trace-events
> index 50ac840..1af3895 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -269,3 +269,13 @@ 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"
> +
> +# event-tap.c
> +disable event_tap_ignore_bh(int bh) "event_tap_bh is already scheduled %d"
> +disable event_tap_net_cb(char *s, ssize_t len) "%s: %zd bytes packet was sended"
> +disable event_tap_no_event(void) "no last_event_tap"
> +disable event_tap_already_used(int mode) "last_event_tap already used %d"
> +disable event_tap_append_packet(void) "This packet is appended"
> +disable event_tap_replay_no_event(void) "No event to replay"
> +disable event_tap_save_no_event(void) "No event to save"
> +disable event_tap_load_no_event(void) "No event to load"
> --
> 1.7.1.2
>
> --
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