Re: [Qemu-devel] [PATCH 1.1 0/4] decouple VIRTIO_BLK_F_SCSI from SG_IO support

[Paolo Bonzini]

Il 16/05/2012 12:54, Paolo Bonzini ha scritto:
> Previous versions of these patches have been posted already, but they
> were lost.  Sorry for realizing this quite late.
> 
> VIRTIO_BLK_F_SCSI is supposed to mean whether the host can *parse*
> SCSI requests, not *execute* them.  So it should always be enabled,
> and the scsi=on/off property tied to a separate configuration variable
> that is not guest visible.
> 
> With this change, Linux has problems understanding failed requests, so
> patch 1 works around the Linux bugs.
> 
> Important: because we need to do this to fix a migration compatibility
> problem when QEMU might be invoked with an old machine type, we must do
> this unconditionally.  This more or less assumes that no one ever invoked
> QEMU with scsi=off, as it breaks migration from new QEMU, scsi=off to
> old QEMU, also scsi=off.  However new->old is not supported upstream.
> 
> S390 compile-tested only.
> 
> Paolo Bonzini (4):
>   virtio-blk: report non-zero status when failing SG_IO requests
>   virtio-blk: blockdev_mark_auto_del is transport-independent
>   virtio-blk: define VirtIOBlkConf
>   virtio-blk: always enable VIRTIO_BLK_F_SCSI
> 
>  hw/s390-virtio-bus.c |   10 ++++---
>  hw/s390-virtio-bus.h |    4 +--
>  hw/virtio-blk.c      |   80 
> ++++++++++++++++++++++++--------------------------
>  hw/virtio-blk.h      |   14 +++++----
>  hw/virtio-pci.c      |   11 +++----
>  hw/virtio-pci.h      |    4 +--
>  hw/virtio.h          |    4 +--
>  7 files changed, 64 insertions(+), 63 deletions(-)
> 

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