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Re: [Qemu-devel] [PATCH] migration: improve documentation of postcopy-ra
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH] migration: improve documentation of postcopy-ram |
Date: |
Wed, 7 Feb 2018 15:55:01 +0000 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
* Greg Kurz (address@hidden) wrote:
> This capability must have the same value on both source and destination,
> otherwise migration fails (commit 875fcd013ab6 "migration: incoming
> postcopy advise sanity checks").
>
> Let's write it down in various places where postcopy-ram is documented.
>
> Signed-off-by: Greg Kurz <address@hidden>
Thanks,
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> ---
> docs/devel/migration.rst | 4 ++--
> hmp-commands.hx | 3 ++-
> qapi/migration.json | 10 ++++++----
> 3 files changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst
> index bf97080dac2f..9d1b7657f0cf 100644
> --- a/docs/devel/migration.rst
> +++ b/docs/devel/migration.rst
> @@ -387,8 +387,8 @@ doesn't finish in a given time the switch is made to
> postcopy.
> Enabling postcopy
> -----------------
>
> -To enable postcopy, issue this command on the monitor prior to the
> -start of migration:
> +To enable postcopy, issue this command on the monitor (both source and
> +destination) prior to the start of migration:
>
> ``migrate_set_capability postcopy-ram on``
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 15620c94d3fc..d26eb4119b9d 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1041,7 +1041,8 @@ ETEXI
> .params = "",
> .help = "Followup to a migration command to switch the
> migration"
> " to postcopy mode. The postcopy-ram capability must "
> - "be set before the original migration command.",
> + "be set on both source and destination before the "
> + "original migration command .",
> .cmd = hmp_migrate_start_postcopy,
> },
>
> diff --git a/qapi/migration.json b/qapi/migration.json
> index 4cd3d1315884..7f465a1902ce 100644
> --- a/qapi/migration.json
> +++ b/qapi/migration.json
> @@ -327,8 +327,10 @@
> # to speed up convergence of RAM migration. (since 1.6)
> #
> # @postcopy-ram: Start executing on the migration target before all of RAM
> has
> -# been migrated, pulling the remaining pages along as needed. NOTE:
> If
> -# the migration fails during postcopy the VM will fail. (since 2.6)
> +# been migrated, pulling the remaining pages along as needed. The
> +# capacity must have the same setting on both source and target
> +# or migration will not even start. NOTE: If the migration fails
> during
> +# postcopy the VM will fail. (since 2.6)
> #
> # @x-colo: If enabled, migration will never end, and the state of the VM on
> the
> # primary side will be migrated continuously to the VM on secondary
> @@ -742,8 +744,8 @@
> # @migrate-start-postcopy:
> #
> # Followup to a migration command to switch the migration to postcopy mode.
> -# The postcopy-ram capability must be set before the original migration
> -# command.
> +# The postcopy-ram capability must be set on both source and destination
> +# before the original migration command.
> #
> # Since: 2.5
> #
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK