[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v3 0/6] migration: check required entries and sections are lo
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v3 0/6] migration: check required entries and sections are loaded |
Date: |
Mon, 6 Nov 2023 12:44:53 -0500 |
On Mon, Nov 06, 2023 at 03:35:54PM +0400, marcandre.lureau@redhat.com wrote:
> From: Marc-André Lureau <marcandre.lureau@redhat.com>
>
> Hi,
>
> Surprisingly, the migration code doesn't check that required migration entries
> and subsections are loaded. Either optional or required sections are both
> ignored when missing. According to the documentation a "newer QEMU that knows
> about a subsection can (with care) load a stream from an older QEMU that
> didn't
> send the subsection". I propose this behaviour to be limited to "optional"
> sections only.
>
> This series has a few preliminary fixes, add new checks that entries are
> loaded once and required ones have been loaded, add some tests and
> documentation update.
>
> thanks
I think this kind of thing is better deferred to the next release -
unless you have something specific in mind this fixes?
> v3:
> - rebased, drop RFC status
> - switch from tracepoint + returning an error to report for missing
> subsections, as we worry about potential regressions
> - add r-b tags
>
> v2:
> - add "migration: rename vmstate_save_needed->vmstate_section_needed"
> - add "migration: set file error on subsection loading"
> - add subsection tests
> - update the documentation
>
> Marc-André Lureau (6):
> block/fdc: 'phase' is not needed on load
> virtio: make endian_needed() work during loading
> migration: check required subsections are loaded, once
> migration: check required entries are loaded, once
> test-vmstate: add some subsection tests
> docs/migration: reflect the changes about needed subsections
>
> docs/devel/migration.rst | 17 +++---
> hw/block/fdc.c | 5 ++
> hw/virtio/virtio.c | 6 +-
> migration/savevm.c | 43 ++++++++++++++
> migration/vmstate.c | 40 ++++++++++++-
> tests/unit/test-vmstate.c | 116 ++++++++++++++++++++++++++++++++++++++
> 6 files changed, 215 insertions(+), 12 deletions(-)
>
> --
> 2.41.0
- [PATCH v3 0/6] migration: check required entries and sections are loaded, marcandre . lureau, 2023/11/06
- [PATCH v3 1/6] block/fdc: 'phase' is not needed on load, marcandre . lureau, 2023/11/06
- [PATCH v3 2/6] virtio: make endian_needed() work during loading, marcandre . lureau, 2023/11/06
- [PATCH v3 4/6] migration: check required entries are loaded, once, marcandre . lureau, 2023/11/06
- [PATCH v3 5/6] test-vmstate: add some subsection tests, marcandre . lureau, 2023/11/06
- [PATCH v3 3/6] migration: check required subsections are loaded, once, marcandre . lureau, 2023/11/06
- [PATCH v3 6/6] docs/migration: reflect the changes about needed subsections, marcandre . lureau, 2023/11/06
- Re: [PATCH v3 0/6] migration: check required entries and sections are loaded,
Michael S. Tsirkin <=