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Re: [PATCH] migration: Provide a test for migratability
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From: |
Eric Blake |
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Subject: |
Re: [PATCH] migration: Provide a test for migratability |
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Date: |
Thu, 21 Jan 2021 16:28:15 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 |
On 1/21/21 12:51 PM, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
>
> Provide a simple way to see if there's currently a migration blocker in
> operation:
>
> $ ./x86_64-softmmu/qemu-system-x86_64 -nographic -M pc,usb=on -chardev
> null,id=n -device usb-serial,chardev=n
>
> (qemu) info migratable
> Error: State blocked by non-migratable device '0000:00:01.2/1/usb-serial'
>
> $ ./x86_64-softmmu/qemu-system-x86_64 -nographic
>
> (qemu) info migratable
> Migratable
>
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
> +++ b/qapi/migration.json
> @@ -366,6 +366,20 @@
> ##
> { 'command': 'query-migrate', 'returns': 'MigrationInfo' }
>
> +##
> +# @query-migratable:
> +# Tests whether it will be possible to migrate the VM in the current state.
> +#
> +# Returns: nothing on success (i.e. if the VM is migratable)
Do we really need a new command? Or can we get away with enhancing the
existing 'query-migrate' to add another bool field to 'MigrationInfo'?
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org