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migration: Remove load_state_old and minimum_version_id_old

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There are no longer any VMStateDescription structs in the tree which
use the load_state_old support for custom handling of incoming
migration from very old QEMU.  Remove the mechanism entirely.

This includes removing one stray useless setting of
minimum_version_id_old in a VMStateDescription with no load_state_old
function, which crept in after the global weeding-out of them in
commit 17e3134061.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220215175705.3846411-1-peter.maydell@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Francisco Iglesias <francisco.iglesias@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Maydell 2022-02-15 17:57:05 +00:00 • committed by Dr. David Alan Gilbert
parent 3ff5740187
commit 1862198702
4 changed files with 2 additions and 17 deletions
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10
docs/devel/migration.rst
View file

@ -389,19 +389,13 @@ Each version is associated with a series of fields saved. The ``save_state`` al
the state as the newer version. But ``load_state`` sometimes is able to
load state from an older version.
You can see that there are several version fields:
You can see that there are two version fields:
- ``version_id``: the maximum version_id supported by VMState for that device.
- ``minimum_version_id``: the minimum version_id that VMState is able to understand
for that device.
- ``minimum_version_id_old``: For devices that were not able to port to vmstate, we can
assign a function that knows how to read this old state. This field is
ignored if there is no ``load_state_old`` handler.
VMState is able to read versions from minimum_version_id to
version_id. And the function ``load_state_old()`` (if present) is able to
load state from minimum_version_id_old to minimum_version_id. This
function is deprecated and will be removed when no more users are left.
VMState is able to read versions from minimum_version_id to version_id.
There are *_V* forms of many ``VMSTATE_`` macros to load fields for version dependent fields,
e.g.