Re: [PATCH v2] migration: Add documentation for backwards compatiblity

[Juan Quintela]

Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> wrote:
> On 11.05.23 15:00, Juan Quintela wrote:
>>>> +Now we start with the more interesting cases.  Let start with the
>>>> +same qemu but not the same machine type.
>>> sounds like "different machine type on source and target" for me..
>>>
>>> Maybe, "not latest machine type" ?
>> Now we start with the more interesting cases.  Let start with a the
>> same QEMU process and a different QEMU version machine type.
>> Better?
>
> No)
>
> Neither I have good wording in mind. That doesn't really matter I
> think, so don't worry, meaning is obvious from the context anyway.
>
> I just mean, that for me:
>
> "same" here: source.qemu.version == target.qemu.version
>
> "different" here: source.qemu.machine_type != target.qemu.machine_type
> -- but you don't mean this and this case doesn't work anyway

Ah, I see what you mean know.

>
> What you mean by "different" that machine type is not equal to qemu
> version.. But formally, it's never "equal", actually, latest machine
> type of the qemu version "corresponds" to that qemu version.
>
> Maybe:
>
> "Consider the case with same QEMU version (5.2) but not latest (not 5.2) 
> machine type:"

Now we start with the more interesting cases.  Consider the case where
we have the same QEMU version in both sides (qemu-5.2) but we are using
the latest machine type for that version (pc-5.2) but one of an older
QEMU version, in this case pc-5.1.

Better?

Later, Juan.