diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2022-02-15 17:57:05 +0000 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2022-03-02 18:20:45 +0000 |
| commit | 18621987027b1800f315fb9e29967e7b5398ef6f (patch) | |
| tree | 1c7f2a82dbe53e02d2e4c8a011e5d85f1acf6dd2 /docs | |
| parent | 3ff57401870481825c50d17afd393f64fa64a0b0 (diff) | |
migration: Remove load_state_old and minimum_version_id_old
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 17e313406126.
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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/devel/migration.rst | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst index 2401253482..3e9656d8e0 100644 --- a/docs/devel/migration.rst +++ b/docs/devel/migration.rst @@ -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. |