From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> Add two src->dest commands: * OPENRP - To request that the destination open the return path * REQACK - Request an acknowledge from the destination
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com> --- include/migration/migration.h | 2 ++ include/sysemu/sysemu.h | 2 ++ savevm.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 47 insertions(+) diff --git a/include/migration/migration.h b/include/migration/migration.h index 728b93e..0e21c5d 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -45,6 +45,8 @@ typedef struct MigrationState MigrationState; /* State for the incoming migration */ struct MigrationIncomingState { QEMUFile *file; + + QEMUFile *return_path; }; MigrationIncomingState *migration_incoming_state_init(QEMUFile *f); diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index 66821eb..b25e938 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -84,6 +84,8 @@ void qemu_announce_self(void); /* Subcommands for QEMU_VM_COMMAND */ enum qemu_vm_cmd { QEMU_VM_CMD_INVALID = 0, /* Must be 0 */ + QEMU_VM_CMD_OPENRP, /* Tell the dest to open the Return path */ + QEMU_VM_CMD_REQACK, /* Request an ACK on the RP */ QEMU_VM_CMD_AFTERLASTVALID }; diff --git a/savevm.c b/savevm.c index 0c7d537..16b672b 100644 --- a/savevm.c +++ b/savevm.c @@ -611,6 +611,19 @@ void qemu_savevm_command_send(QEMUFile *f, qemu_fflush(f); } +void qemu_savevm_send_reqack(QEMUFile *f, uint32_t value) +{ + uint32_t buf; + + DPRINTF("send_reqack %d", value); + buf = cpu_to_be32(value); + qemu_savevm_command_send(f, QEMU_VM_CMD_REQACK, 4, (uint8_t *)&buf); +} + +void qemu_savevm_send_openrp(QEMUFile *f) +{ + qemu_savevm_command_send(f, QEMU_VM_CMD_OPENRP, 0, NULL); +} bool qemu_savevm_state_blocked(Error **errp) { SaveStateEntry *se; @@ -918,6 +931,7 @@ static int loadvm_process_command_simple_lencheck(const char *name, */ static int loadvm_process_command(QEMUFile *f) { + MigrationIncomingState *mis = f->mis; uint16_t com; uint16_t len; uint32_t tmp32; @@ -927,6 +941,35 @@ static int loadvm_process_command(QEMUFile *f) /* fprintf(stderr,"loadvm_process_command: com=0x%x len=%d\n", com,len); */ switch (com) { + case QEMU_VM_CMD_OPENRP: + if (loadvm_process_command_simple_lencheck("CMD_OPENRP", len, 0)) { + return -1; + } + if (mis->return_path) { + error_report("CMD_OPENRP called when RP already open"); + /* Not really a problem, so don't give up */ + return 0; + } + mis->return_path = qemu_file_get_return_path(f); + if (!mis->return_path) { + error_report("CMD_OPENRP failed - could not open return path"); + return -1; + } + break; + + case QEMU_VM_CMD_REQACK: + if (loadvm_process_command_simple_lencheck("CMD_REQACK", len, 4)) { + return -1; + } + tmp32 = qemu_get_be32(f); + DPRINTF("Received REQACK 0x%x", tmp32); + if (!mis->return_path) { + error_report("CMD_REQACK (0x%x) received with no open return path", + tmp32); + return -1; + } + migrate_send_rp_ack(mis, tmp32); + break; default: error_report("VM_COMMAND 0x%x unknown (len 0x%x)", com, len); -- 1.9.3