devel/migration/compatibility.rst

26 - pc-q35-5.2 (newer one in qemu-5.2) from now on pc-5.2
27 - pc-q35-5.1 (newer one in qemu-5.1) from now on pc-5.1
40 1 - qemu-5.2 -M pc-5.2  -> migrates to -> qemu-5.2 -M pc-5.2
45 2 - qemu-5.1 -M pc-5.1  -> migrates to -> qemu-5.1 -M pc-5.1
55 the latest machine type for that version (pc-5.2) but one of an older
56 QEMU version, in this case pc-5.1.
58 3 - qemu-5.2 -M pc-5.1  -> migrates to -> qemu-5.2 -M pc-5.1
60   It needs to use the definition of pc-5.1 and the devices as they
63   idea of what the pc-5.1 machine is.
65 4 - qemu-5.1 -M pc-5.2  -> migrates to -> qemu-5.1 -M pc-5.2
68   pc-5.2 machine type.  So nothing to worry here.
71 different.  Notice also that the machine type needs to be pc-5.1,
72 because we have the limitation than qemu-5.1 doesn't know pc-5.2.  So
75 5 - qemu-5.2 -M pc-5.1  -> migrates to -> qemu-5.1 -M pc-5.1
83 6 - qemu-5.1 -M pc-5.1  -> migrates to -> qemu-5.2 -M pc-5.1
98 pc-5.1, it needs to **not** use the feature, to be able to migrate to
144 that when it is running pc-5.1, it needs to set the number of queues
149 5 - qemu-5.2 -M pc-5.1  -> migrates to -> qemu-5.1 -M pc-5.1
151     qemu-5.2 -M pc-5.1 sets number of queues to be 1.
152     qemu-5.1 -M pc-5.1 expects number of queues to be 1.
156 6 - qemu-5.1 -M pc-5.1  -> migrates to -> qemu-5.2 -M pc-5.1
158     qemu-5.1 -M pc-5.1 sets number of queues to be 1.
159     qemu-5.2 -M pc-5.1 expects number of queues to be 1.
165 3 - qemu-5.2 -M pc-5.1  -> migrates to -> qemu-5.2 -M pc-5.1
179     A: qemu-5.1 -M pc-5.1
180     B: qemu-5.2 -M pc-5.1
181     C: qemu-5.2 -M pc-5.1
188     always use number of queues 1 when we are using pc-5.1.
328 of the machine type pc-7.2.
330 - $ qemu-7.2 -M pc-7.2  ->  qemu-7.2 -M pc-7.2
334 - $ qemu-8.0 -M pc-7.2  ->  qemu-8.0 -M pc-7.2
338 - $ qemu-8.0 -M pc-7.2  ->  qemu-7.2 -M pc-7.2
342 - $ qemu-7.2 -M pc-7.2  ->  qemu-8.0 -M pc-7.2
347 qemu-8.0 with machine type pc-7.2.  The error messages, and git bisect
457 - $ qemu-7.2 -M pc-7.2  ->  qemu-7.2 -M pc-7.2 (works)
458 - $ qemu-8.0.1 -M pc-7.2  ->  qemu-8.0.1 -M pc-7.2 (works)
459 - $ qemu-8.0.1 -M pc-7.2  ->  qemu-7.2 -M pc-7.2 (works)
460 - $ qemu-7.2 -M pc-7.2  ->  qemu-8.0.1 -M pc-7.2 (works)
468 - $ qemu-7.2 -M pc-7.2  ->  qemu-7.2 -M pc-7.2
469 - $ qemu-8.0 -M pc-7.2  ->  qemu-8.0 -M pc-7.2
470 - $ qemu-8.0.1 -M pc-7.2  ->  qemu-8.0.1 -M pc-7.2
476 - $ qemu-7.2 -M pc-7.2  ->  qemu-8.0 -M pc-7.2
477 - $ qemu-8.0 -M pc-7.2  ->  qemu-7.2 -M pc-7.2
482 - $ qemu-7.2 -M pc-7.2  ->  qemu-8.0.1 -M pc-7.2
483 - $ qemu-8.0.1 -M pc-7.2  ->  qemu-7.2 -M pc-7.2
488 - $ qemu-8.0 -M pc-7.2  ->  qemu-8.0.1 -M pc-7.2
489 - $ qemu-8.0.1 -M pc-7.2  ->  qemu-8.0 -M pc-7.2
491 So, if we start a pc-7.2 machine in qemu-8.0 we can't migrate it to
498 - $ qemu-8.0 -M pc-7.2  ->  qemu-8.0.1 -M pc-7.2
506 property for pc-7.2.  Notice that we need to remember, it is not
510 $ qemu-8.0 -M pc-7.2 -> qemu-8.0.1 -M pc-7.2 -> qemu-8.2 -M pc-7.2