On Mon, Feb 09, 2015 at 05:15:26PM +0100, Andreas Maier wrote:
> Hello,
> I would like to ask for the following feature freeze exceptions in Nova.
> The patch sets below are all part of this blueprint:
> https://review.openstack.org/#/q/status:open+project:openstack/nova
> +branch:master+topic:bp/libvirt-kvm-systemz,n,z
> and affect only the kvm/libvirt driver of Nova.
> The decision for merging these patch sets by exception can be made one by
> one; they are independent of each other.
> 1. https://review.openstack.org/149242 - FCP support
>    Title: libvirt: Adjust Nova to support FCP on System z systems
>    What it does: This patch set enables FCP support for KVM on System z.
>    Impact if we don't get this: FCP attached storage does not work for KVM
>    on System z.
>    Why we need it: We really depend on this particular patch set, because
>    FCP is our most important storage attachment.
>    Additional notes: The code in the libvirt driver that is updated by this
>    patch set is consistent with corresponding code in the Cinder driver,
>    and it has seen review by the Cinder team.
> 2. https://review.openstack.org/150505 - Console support
>    Title: libvirt: Enable serial_console feature for system z
>    What it does: This patch set enables the backing support in Nova for the
>    interactive console in Horizon.
>    Impact if we don't get this: Console in Horizon does not work. The
>    mitigation for a user would be to use the Log in Horizon (i.e. with
>    serial_console disabled), or the "virsh console" command in an ssh
>    session to the host Linux.
>    Why we need it: We'd like to have console support. Also, because the
>    Nova support for the Log in Horizon has been merged in an earlier patch
>    set as part of this blueprint, this remaining patch set makes the
>    console/log support consistent for KVM on System z Linux.
> 3. https://review.openstack.org/150497 - ISO/CDROM support
>    Title: libvirt: Set SCSI as the default cdrom bus on System z
>    What it does: This patch set enables that cdrom drives can be attached
>    to an instance on KVM on System z. This is needed for example for
>    cloud-init config files, but also for simply attaching ISO images to
>    instances. The technical reason for this change is that the "IDE"
>    attachment is not available on System z, and we need "SCSI" (just like
>    Power Linux).
>    Impact if we don't get this:
>       - Cloud-init config files cannot be on a cdrom drive. A mitigation
>          for a user would be to have such config files on a cloud-init
>          server.
>       - ISO images cannot be attached to instances. There is no mitigation.
>    Why we need it: We would like to avoid having to restrict cloud-init
>    configuration to just using cloud-init servers. We would like to be able
>    to support ISO images.
>    Additional notes: This patch is a one line change (it simply extends
>    what is already done in a platform specific case for the Power platform,
>    to be also used for System z).

I will happily sponsor exception on patches 2 & 3, since they are pretty
trivial & easily understood.

I will tenatively sponsor patch 1, if other reviewers feel able to do a
strong review of the SCSI stuff, since this is SCSI host setup is not
something I'm particularly familiar with.

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