Re: [Qemu-devel] [PATCH] virtio-scsi spec: add per-LUN parameter query

[McPacino]

在 2012-8-20 下午9:18，"Paolo Bonzini" <address@hidden>写道：
>
> Il 20/08/2012 11:03, Cong Meng ha scritto:
> > Each virtio scsi HBA has global request queue limits. But the passthrough
> > LUNs (scsi-generic) come from different host HBAs may have different request
> > queue limits. If the guest sends commands that exceed the host limits, the
> > commands will be rejected by host HAB.
> >
> > To address this issue, this patch adds a per-LUN parameter query via the control
> > queue, and defines some parameter query types. The driver can query and set the
> > needed per-LUN parameters if the device enables this feature.
> >
> > Signed-off-by: Cong Meng <address@hidden>
> > --
> >  virtio-spec.lyx |  218 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  1 files changed, 218 insertions(+), 0 deletions(-)
>
> Do you have kernel and QEMU patches for this?  That would help me
> evaluate whether the interface is the correct one.
>
yes,I have a demo. I will post it after I polish it tomorrow.

> In any case, I'd rather have a single command returning all three values
> (VIRTIO_SCSI_T_LUN_QUEUE_PARAMS), since it's unlikely that you need just
> one.

I intend to seperat them one by one. As there is opportunity that other new parameters are needed for other features.

Thanks.
Cong.

>
> Paolo
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