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Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passt
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device |
Date: |
Mon, 13 Jul 2015 14:27:26 +0300 |
On Mon, Jul 13, 2015 at 05:00:51PM +0800, Jason Wang wrote:
>
>
> On 07/13/2015 03:46 PM, Michael S. Tsirkin wrote:
> > On Mon, Jul 13, 2015 at 01:46:48PM +0800, Jason Wang wrote:
> >> VIRTIO_BLK_F_SCSI was no longer supported in 1.0. So disable it.
> >>
> >> Cc: Stefan Hajnoczi <address@hidden>
> >> Cc: Kevin Wolf <address@hidden>
> >> Cc: address@hidden
> >> Signed-off-by: Jason Wang <address@hidden>
> > Interesting, I noticed we have a field scsi - see
> > commit 1ba1f2e319afdcb485963cd3f426fdffd1b725f2
> > Author: Paolo Bonzini <address@hidden>
> > Date: Fri Dec 23 15:39:03 2011 +0100
> >
> > virtio-blk: refuse SG_IO requests with scsi=off
> >
> > but it doesn't seem to be propagated to guest features in
> > any way.
> >
> > Maybe we should fix that, making that flag AutoOnOff?
>
> Looks ok but auto may need some compat work since default is true.
Right. Auto would then mean "!modern".
> > Then, if user explicitly requested scsi=on with a modern
> > interface then we can error out cleanly.
> >
> > Given scsi flag is currently ignored, I think
> > this can be a patch on top.
>
> Looks like virtio_blk_handle_scsi_req() check this:
>
> if (!blk->conf.scsi) {
> status = VIRTIO_BLK_S_UNSUPP;
> goto fail;
> }
>
> >
> >> ---
> >> hw/block/virtio-blk.c | 3 ++-
> >> 1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> >> index 6aefda4..f30ad25 100644
> >> --- a/hw/block/virtio-blk.c
> >> +++ b/hw/block/virtio-blk.c
> >> @@ -730,7 +730,8 @@ static uint64_t virtio_blk_get_features(VirtIODevice
> >> *vdev, uint64_t features)
> >> virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
> >> virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
> >> virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
> >> - virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
> >> + if (!__virtio_has_feature(features, VIRTIO_F_VERSION_1))
> >> + virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
> >>
> >> if (s->conf.config_wce) {
> >> virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE);
> >> --
> >> 2.1.4
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, (continued)
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Cornelia Huck, 2015/07/15
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Michael S. Tsirkin, 2015/07/15
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Cornelia Huck, 2015/07/15
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Michael S. Tsirkin, 2015/07/15
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Cornelia Huck, 2015/07/15
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Michael S. Tsirkin, 2015/07/15
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Cornelia Huck, 2015/07/16
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Michael S. Tsirkin, 2015/07/16
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Paolo Bonzini, 2015/07/16
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device, Cornelia Huck, 2015/07/17
- Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] virtio-blk: disable scsi passthrough for 1.0 device,
Michael S. Tsirkin <=