Re: [PATCH] hw/virtio-scsi: Set max_target=0 during vhost-scsi operation

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HI,

Do we need to maintain one QEMU branch to collect all useful latest
patches for tcm_vhost support?  You know, those patches will not get
merged into qemu.git/master.


On Thu, Jul 12, 2012 at 4:55 AM, Nicholas A. Bellinger
<nab@xxxxxxxxxxxxxxx> wrote:
> From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
>
> This QEMU patch sets VirtIOSCSIConfig->max_target=0 for vhost-scsi operation
> to restrict virtio-scsi LLD guest scanning to max_id=0 (a single target ID
> instance) when connected to individual tcm_vhost endpoints as requested by
> Paolo.
>
> This ensures that virtio-scsi LLD only attempts to scan target IDs up to
> VIRTIO_SCSI_MAX_TARGET when connected via virtio-scsi-raw.
>
> It's currently cut against Zhi's qemu vhost-scsi tree here:
>
>    https://github.com/wuzhy/qemu/tree/vhost-scsi
>
> Cc: Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>
> Cc: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> ---
>  hw/virtio-scsi.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
> index e38cdd0..71276b6 100644
> --- a/hw/virtio-scsi.c
> +++ b/hw/virtio-scsi.c
> @@ -523,7 +523,11 @@ static void virtio_scsi_get_config(VirtIODevice *vdev,
>      stl_raw(&scsiconf->sense_size, s->sense_size);
>      stl_raw(&scsiconf->cdb_size, s->cdb_size);
>      stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
> -    stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
> +    if (s->vhost_scsi) {
> +        stl_raw(&scsiconf->max_target, 0);
> +    } else {
> +        stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
> +    }
>      stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
>  }
>
> --
> 1.7.2.5
>
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-- 
Regards,

Zhi Yong Wu
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