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Re: [Qemu-devel] [PATCH] virtio-scsi spec: add per-LUN parameter query
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] virtio-scsi spec: add per-LUN parameter query |
Date: |
Mon, 20 Aug 2012 15:18:30 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 |
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.
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.
Paolo