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Return path: Control commands

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Add two src->dest commands:
   * OPEN_RETURN_PATH - To request that the destination open the return path
   * PING - Request an acknowledge from the destination

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2015-11-05 18:10:46 +00:00 committed by Juan Quintela
parent c76ca1888f
commit 2e37701efd
4 changed files with 51 additions and 1 deletions
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2
include/migration/migration.h
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@ -48,6 +48,8 @@ typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
struct MigrationIncomingState {
QEMUFile *from_src_file;
QEMUFile *to_src_file;
/* See savevm.c */
LoadStateEntry_Head loadvm_handlers;
};

4
include/sysemu/sysemu.h
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@ -87,6 +87,8 @@ void qemu_announce_self(void);
/* Subcommands for QEMU_VM_COMMAND */
enum qemu_vm_cmd {
MIG_CMD_INVALID = 0, /* Must be 0 */
MIG_CMD_OPEN_RETURN_PATH, /* Tell the dest to open the Return path */
MIG_CMD_PING, /* Request a PONG on the RP */
MIG_CMD_MAX
};
@ -100,6 +102,8 @@ void qemu_savevm_state_complete_precopy(QEMUFile *f);
uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size);
void qemu_savevm_command_send(QEMUFile *f, enum qemu_vm_cmd command,
uint16_t len, uint8_t *data);
void qemu_savevm_send_ping(QEMUFile *f, uint32_t value);
void qemu_savevm_send_open_return_path(QEMUFile *f);
int qemu_loadvm_state(QEMUFile *f);
typedef enum DisplayType

43
migration/savevm.c
View File

@ -64,6 +64,8 @@ static struct mig_cmd_args {
const char *name;
} mig_cmd_args[] = {
[MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" },
[MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" },
[MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" },
[MIG_CMD_MAX] = { .len = -1, .name = "MAX" },
};
@ -724,6 +726,21 @@ void qemu_savevm_command_send(QEMUFile *f,
qemu_fflush(f);
}
void qemu_savevm_send_ping(QEMUFile *f, uint32_t value)
{
uint32_t buf;
trace_savevm_send_ping(value);
buf = cpu_to_be32(value);
qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf);
}
void qemu_savevm_send_open_return_path(QEMUFile *f)
{
trace_savevm_send_open_return_path();
qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL);
}
bool qemu_savevm_state_blocked(Error **errp)
{
SaveStateEntry *se;
@ -1043,8 +1060,10 @@ static SaveStateEntry *find_se(const char *idstr, int instance_id)
*/
static int loadvm_process_command(QEMUFile *f)
{
MigrationIncomingState *mis = migration_incoming_get_current();
uint16_t cmd;
uint16_t len;
uint32_t tmp32;
cmd = qemu_get_be16(f);
len = qemu_get_be16(f);
@ -1063,7 +1082,29 @@ static int loadvm_process_command(QEMUFile *f)
}
switch (cmd) {
/* Filling added in next patch */
case MIG_CMD_OPEN_RETURN_PATH:
if (mis->to_src_file) {
error_report("CMD_OPEN_RETURN_PATH called when RP already open");
/* Not really a problem, so don't give up */
return 0;
}
mis->to_src_file = qemu_file_get_return_path(f);
if (!mis->to_src_file) {
error_report("CMD_OPEN_RETURN_PATH failed");
return -1;
}
break;
case MIG_CMD_PING:
tmp32 = qemu_get_be32(f);
trace_loadvm_process_command_ping(tmp32);
if (!mis->to_src_file) {
error_report("CMD_PING (0x%x) received with no return path",
tmp32);
return -1;
}
/* migrate_send_rp_pong(mis, tmp32); TODO: gets added later */
break;
}
return 0;

3
trace-events
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@ -1205,10 +1205,13 @@ qemu_loadvm_state_section(unsigned int section_type) "%d"
qemu_loadvm_state_section_partend(uint32_t section_id) "%u"
qemu_loadvm_state_section_startfull(uint32_t section_id, const char *idstr, uint32_t instance_id, uint32_t version_id) "%u(%s) %u %u"
loadvm_process_command(uint16_t com, uint16_t len) "com=0x%x len=%d"
loadvm_process_command_ping(uint32_t val) "%x"
savevm_command_send(uint16_t command, uint16_t len) "com=0x%x len=%d"
savevm_section_start(const char *id, unsigned int section_id) "%s, section_id %u"
savevm_section_end(const char *id, unsigned int section_id, int ret) "%s, section_id %u -> %d"
savevm_section_skip(const char *id, unsigned int section_id) "%s, section_id %u"
savevm_send_open_return_path(void) ""
savevm_send_ping(uint32_t val) "%x"
savevm_state_begin(void) ""
savevm_state_header(void) ""
savevm_state_iterate(void) ""