Re: [Qemu-devel] [PATCH v2 3/3] virtio-blk: switch off scsi-passthrough by default

[Cornelia Huck <cornelia.huck@de.ibm.com>]

On Fri, 16 Oct 2015 12:32:52 +0200
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> Am 16.10.2015 um 12:25 schrieb Cornelia Huck:
> > Devices that are compliant with virtio-1 do not support scsi
> > passthrough any more (and it has not been a recommended setup
> > anyway for quite some time). To avoid having to switch it off
> > explicitly in newer qemus that turn on virtio-1 by default, let's
> > switch the default to scsi=false for 2.5.
> > 
> > Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
> > ---
> >  hw/block/virtio-blk.c | 2 +-
> >  include/hw/compat.h   | 6 +++++-
> >  2 files changed, 6 insertions(+), 2 deletions(-)
> > 
> > diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> > index 8beb26b..999dbd7 100644
> > --- a/hw/block/virtio-blk.c
> > +++ b/hw/block/virtio-blk.c
> > @@ -975,7 +975,7 @@ static Property virtio_blk_properties[] = {
> >      DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
> >      DEFINE_PROP_BIT("config-wce", VirtIOBlock, conf.config_wce, 0, true),
> >  #ifdef __linux__
> > -    DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, true),
> > +    DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, false),
> >  #endif
> >      DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
> >                      true),
> > diff --git a/include/hw/compat.h b/include/hw/compat.h
> > index 095de5d..93e71af 100644
> > --- a/include/hw/compat.h
> > +++ b/include/hw/compat.h
> > @@ -2,7 +2,11 @@
> >  #define HW_COMPAT_H
> > 
> >  #define HW_COMPAT_2_4 \
> > -        /* empty */
> > +        {\
> > +            .driver   = "virtio-blk-device",\
> > +            .property = "scsi",\
> > +            .value    = "true",\
> 
> does that work?

It did for me :)

> 
> If yes, would it make sense to convert the things in HW_COMPAT_2_3 from
> pci to device, e.g.
> 
> 
>         {\
> -           .driver   = "virtio-blk-pci",\
> +           .driver   = "virtio-blk-device",\
>             .property = "any_layout",\
>             .value    = "off",\
> ...

Not sure: We don't have 2.3 compat for ccw... but would give a better
template for later changes.