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Re: [Qemu-devel] [PATCH 0/3] migration: export cap/params to qdev props
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] migration: export cap/params to qdev props |
Date: |
Wed, 12 Jul 2017 20:02:40 +0100 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
* Peter Xu (address@hidden) wrote:
> We have the MigrationState as QDev now (which seems crazy). Let's
> continue to benefit.
>
> This series is exporting all migration capabilities/params as global
> parameters. Then we can do something like this:
>
> qemu -global migration.postcopy-ram=true \
> -global migration.max-bandwidth=4096
>
> The values will be inited just like we typed these values into HMP
> monitor. It'll simplify lots of migration scripts.
>
> The changes are fairly straightforward. One tiny loss is that we still
> don't support:
>
> -global migration.max-bandwidth=1g
>
> ...just like what we did in HMP:
>
> migrate_set_speed 1g
>
> ...while we need to use:
>
> -global migration.max-bandwidth=1073741824
>
> However that should only be used in scripts, and that's good enough
> imho.
>
> These properties should only be used for debugging/testing purpose,
> and we should not guarantee any interface compatibility for them (just
> like HMP).
I guess the sanity checks in qmp_migrate_set_parameters and
qmp_migrate_set_capabilities aren't run?
Also, have you done any checks on multiple migrations; e.g. it's good
to check that the flags/state are all preserved if we do a migrate, that
migrate fails or is cancelled and then you do a 2nd migrate.
Dave
> Please review. Thanks.
>
> Peter Xu (3):
> qdev: provide DEFINE_PROP_INT64()
> migration: export parameters to props
> migration: export capabilities to props
>
> hw/core/qdev-properties.c | 32 +++++++++++++++++++++++++++
> include/hw/qdev-properties.h | 3 +++
> migration/migration.c | 52
> +++++++++++++++++++++++++++++++++++---------
> 3 files changed, 77 insertions(+), 10 deletions(-)
>
> --
> 2.7.4
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK