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migration: new cmd MIG_CMD_POSTCOPY_RESUME 

Introducing this new command to be sent when the source VM is ready to
resume the paused migration.  What the destination does here is
basically release the fault thread to continue service page faults.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-14-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2018-05-02 18:47:29 +08:00 committed by Juan Quintela
parent a335debb35
commit 3f5875eca5
3 changed files with 38 additions and 0 deletions
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35
migration/savevm.c
View File

@ -80,6 +80,7 @@ enum qemu_vm_cmd {
MIG_CMD_POSTCOPY_RAM_DISCARD, /* A list of pages to discard that
were previously sent during
precopy but are dirty. */
MIG_CMD_POSTCOPY_RESUME, /* resume postcopy on dest */
MIG_CMD_PACKAGED, /* Send a wrapped stream within this stream */
MIG_CMD_RECV_BITMAP, /* Request for recved bitmap on dst */
MIG_CMD_MAX
@ -98,6 +99,7 @@ static struct mig_cmd_args {
[MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" },
[MIG_CMD_POSTCOPY_RAM_DISCARD] = {
.len = -1, .name = "POSTCOPY_RAM_DISCARD" },
[MIG_CMD_POSTCOPY_RESUME] = { .len = 0, .name = "POSTCOPY_RESUME" },
[MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" },
[MIG_CMD_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" },
[MIG_CMD_MAX] = { .len = -1, .name = "MAX" },
@ -958,6 +960,12 @@ void qemu_savevm_send_postcopy_run(QEMUFile *f)
qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL);
}
void qemu_savevm_send_postcopy_resume(QEMUFile *f)
{
trace_savevm_send_postcopy_resume();
qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RESUME, 0, NULL);
}
void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name)
{
size_t len;
@ -1768,6 +1776,30 @@ static int loadvm_postcopy_handle_run(MigrationIncomingState *mis)
return LOADVM_QUIT;
}
static int loadvm_postcopy_handle_resume(MigrationIncomingState *mis)
{
if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) {
error_report("%s: illegal resume received", __func__);
/* Don't fail the load, only for this. */
return 0;
}
/*
* This means source VM is ready to resume the postcopy migration.
* It's time to switch state and release the fault thread to
* continue service page faults.
*/
migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_RECOVER,
MIGRATION_STATUS_POSTCOPY_ACTIVE);
qemu_sem_post(&mis->postcopy_pause_sem_fault);
trace_loadvm_postcopy_handle_resume();
/* TODO: Tell source that "we are ready" */
return 0;
}
/**
* Immediately following this command is a blob of data containing an embedded
* chunk of migration stream; read it and load it.
@ -1933,6 +1965,9 @@ static int loadvm_process_command(QEMUFile *f)
case MIG_CMD_POSTCOPY_RAM_DISCARD:
return loadvm_postcopy_ram_handle_discard(mis, len);
case MIG_CMD_POSTCOPY_RESUME:
return loadvm_postcopy_handle_resume(mis);
case MIG_CMD_RECV_BITMAP:
return loadvm_handle_recv_bitmap(mis, len);
}

1
migration/savevm.h
View File

@ -47,6 +47,7 @@ int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len);
void qemu_savevm_send_postcopy_advise(QEMUFile *f);
void qemu_savevm_send_postcopy_listen(QEMUFile *f);
void qemu_savevm_send_postcopy_run(QEMUFile *f);
void qemu_savevm_send_postcopy_resume(QEMUFile *f);
void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name);
void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name,

2
migration/trace-events
View File

@ -18,6 +18,7 @@ loadvm_postcopy_handle_listen(void) ""
loadvm_postcopy_handle_run(void) ""
loadvm_postcopy_handle_run_cpu_sync(void) ""
loadvm_postcopy_handle_run_vmstart(void) ""
loadvm_postcopy_handle_resume(void) ""
loadvm_postcopy_ram_handle_discard(void) ""
loadvm_postcopy_ram_handle_discard_end(void) ""
loadvm_postcopy_ram_handle_discard_header(const char *ramid, uint16_t len) "%s: %ud"
@ -35,6 +36,7 @@ savevm_send_open_return_path(void) ""
savevm_send_ping(uint32_t val) "0x%x"
savevm_send_postcopy_listen(void) ""
savevm_send_postcopy_run(void) ""
savevm_send_postcopy_resume(void) ""
savevm_send_recv_bitmap(char *name) "%s"
savevm_state_setup(void) ""
savevm_state_header(void) ""