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Re: [libvirt PATCH 6/9] qemu: Allow NBD migration over UNIX socket



On Tue, Aug 25, 2020 at 07:47:12AM +0200, Martin Kletzander wrote:
> Adds new typed param for migration and uses this as a UNIX socket path that
> should be used for the NBD part of migration.  And also adds virsh support.
> 
> Partially resolves: https://bugzilla.redhat.com/1638889
> 
> Signed-off-by: Martin Kletzander <mkletzan redhat com>
> ---
>  docs/manpages/virsh.rst          |   8 +++
>  include/libvirt/libvirt-domain.h |  12 ++++
>  src/qemu/qemu_domain.h           |   1 +
>  src/qemu/qemu_driver.c           |  33 ++++++++--
>  src/qemu/qemu_migration.c        | 110 ++++++++++++++++++++++---------
>  src/qemu/qemu_migration.h        |   3 +
>  src/qemu/qemu_migration_cookie.c |  22 +++++--
>  src/qemu/qemu_migration_cookie.h |   1 +
>  tools/virsh-domain.c             |  12 ++++
>  9 files changed, 160 insertions(+), 42 deletions(-)
> 
> diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst
> index 9187037a5615..75f475eea6ad 100644
> --- a/docs/manpages/virsh.rst
> +++ b/docs/manpages/virsh.rst
> @@ -3113,6 +3113,7 @@ migrate
>        [--postcopy-bandwidth bandwidth]
>        [--parallel [--parallel-connections connections]]
>        [--bandwidth bandwidth] [--tls-destination hostname]
> +      [--disks-socket socket-path]

For the primary migration connection we have a proper URI, so we can
support new schemes without adding new parameters for each one.

For the NBD connetion we have the "disk port" parameter only, not a
full URI.

Adding "disks socket" makes this design mistake worse.

IMHO we should add a "disks uri" accepting the exact same syntax
as the migration URI.


Regards,
Daniel
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