motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-07-27 04:13:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

migration: Add MIG_CMD_SWITCHOVER_START and its load handler

Browse source 
This QEMU_VM_COMMAND sub-command and its switchover_start SaveVMHandler is
used to mark the switchover point in main migration stream.

It can be used to inform the destination that all pre-switchover main
migration stream data has been sent/received so it can start to process
post-switchover data that it might have received via other migration
channels like the multifd ones.

Add also the relevant MigrationState bit stream compatibility property and
its hw_compat entry.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Zhang Chen <zhangckid@gmail.com> # for the COLO part
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Link: https://lore.kernel.org/qemu-devel/311be6da85fc7e49a7598684d80aa631778dcbce.1741124640.git.maciej.szmigiero@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Maciej S. Szmigiero 2025-03-04 23:03:32 +01:00 • committed by Cédric Le Goater
parent b5aa74968b
commit 4e55cb3cde
12 changed files with 87 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

11
scripts/analyze-migration.py
View file

@ -620,7 +620,9 @@ class MigrationDump(object):
QEMU_VM_SUBSECTION = 0x05
QEMU_VM_VMDESCRIPTION = 0x06
QEMU_VM_CONFIGURATION = 0x07
QEMU_VM_COMMAND = 0x08
QEMU_VM_SECTION_FOOTER= 0x7e
QEMU_MIG_CMD_SWITCHOVER_START = 0x0b
def __init__(self, filename):
self.section_classes = {
@ -685,6 +687,15 @@ class MigrationDump(object):
elif section_type == self.QEMU_VM_SECTION_PART or section_type == self.QEMU_VM_SECTION_END:
section_id = file.read32()
self.sections[section_id].read()
elif section_type == self.QEMU_VM_COMMAND:
command_type = file.read16()
command_data_len = file.read16()
if command_type != self.QEMU_MIG_CMD_SWITCHOVER_START:
raise Exception("Unknown QEMU_VM_COMMAND: %x" %
(command_type))
if command_data_len != 0:
raise Exception("Invalid SWITCHOVER_START length: %x" %
(command_data_len))
elif section_type == self.QEMU_VM_SECTION_FOOTER:
read_section_id = file.read32()
if read_section_id != section_id: