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

[Anthony Liguori <aliguori@us.ibm.com>]

On 05/21/2012 10:56 AM, Paolo Bonzini wrote:
> 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(-)
>
>
> Ping?

Ack.  I'll queue it for -rc3.

Regards,

Anthony Liguori

>