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Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality f
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi |
Date: |
Tue, 11 Sep 2012 18:07:57 +0300 |
On Tue, Sep 11, 2012 at 08:46:34AM -0500, Anthony Liguori wrote:
> On 09/10/2012 01:24 AM, Michael S. Tsirkin wrote:
> >On Mon, Sep 10, 2012 at 08:16:54AM +0200, Paolo Bonzini wrote:
> >>Il 09/09/2012 00:40, Michael S. Tsirkin ha scritto:
> >>>On Fri, Sep 07, 2012 at 06:00:50PM +0200, Paolo Bonzini wrote:
> >>>>Il 07/09/2012 08:48, Nicholas A. Bellinger ha scritto:
> >>>>>Cc: Stefan Hajnoczi<address@hidden>
> >>>>>Cc: Zhi Yong Wu<address@hidden>
> >>>>>Cc: Michael S. Tsirkin<address@hidden>
> >>>>>Cc: Paolo Bonzini<address@hidden>
> >>>>>Signed-off-by: Nicholas Bellinger<address@hidden>
> >>>>>---
> >>>>> hw/virtio-pci.c | 2 ++
> >>>>> hw/virtio-scsi.c | 49
> >>>>> +++++++++++++++++++++++++++++++++++++++++++++++++
> >>>>> hw/virtio-scsi.h | 1 +
> >>>>> 3 files changed, 52 insertions(+), 0 deletions(-)
> >>>>
> >>>>Please create a completely separate device vhost-scsi-pci instead (or
> >>>>virtio-scsi-tcm-pci, or something like that). It is used completely
> >>>>differently from virtio-scsi-pci, it does not make sense to conflate the
> >>>>two.
> >>>
> >>>Ideally the name would say how it is different, not what backend it
> >>>uses. Any good suggestions?
> >>
> >>I chose the backend name because, ideally, there would be no other
> >>difference. QEMU _could_ implement all the goodies in vhost-scsi (such
> >>as reservations or ALUA), it just doesn't do that yet.
> >>
> >>Paolo
> >
> >Then why do you say "It is used completely differently from
> >virtio-scsi-pci"? Isn't it just a different backend?
> >
> >If yes then it should be a backend option, like it is
> >for virtio-net.
>
> I don't mean to bike shed here so don't take this as a nack on
> making it a backend option, but in retrospect, the way we did
> vhost-net was a mistake even though I strongly advocated for it to
> be a backend option.
>
> The code to do it is really, really ugly. I think it would have
> made a lot more sense to just make it a device and then have it not
> use a netdev backend or any other kind of backend split.
>
> For instance:
>
> qemu -device vhost-net-pci,tapfd=X
>
> I know this breaks the model of separate backends and frontends but
> since vhost-net absolutely requires a tap fd, I think it's better in
> the long run to not abuse the netdev backend to prevent user
> confusion. Having a dedicated backend type that only has one
> possible option and can only be used by one device is a bit silly
> too.
>
> So I would be in favor of dropping/squashing 3/5 and radically
> simplifying how this was exposed to the user.
>
> I would just take qemu_vhost_scsi_opts and make them device properties.
>
> Regards,
>
> Anthony Liguori
I'd like to clarify that I'm fine with either approach.
Even a separate device is OK if this is what others want
though I like it the least.
> >
- [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, (continued)
- [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Nicholas A. Bellinger, 2012/09/07
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Paolo Bonzini, 2012/09/07
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Michael S. Tsirkin, 2012/09/08
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Paolo Bonzini, 2012/09/10
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Michael S. Tsirkin, 2012/09/10
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Paolo Bonzini, 2012/09/10
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Michael S. Tsirkin, 2012/09/10
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Anthony Liguori, 2012/09/11
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Nicholas A. Bellinger, 2012/09/13
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Paolo Bonzini, 2012/09/14
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Michael S. Tsirkin, 2012/09/14
- Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi, Michael S. Tsirkin, 2012/09/14
[Qemu-devel] [PATCH 5/5] virtio-scsi: Set max_target=0 during vhost-scsi operation, Nicholas A. Bellinger, 2012/09/07
Re: [Qemu-devel] [PATCH 0/5] vhost-scsi: Add support for host virtualized target, Asias He, 2012/09/11