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Re: [Qemu-devel] [PATCH 0/3] decouple VIRTIO_BLK_F_SCSI from SG_IO suppo
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] decouple VIRTIO_BLK_F_SCSI from SG_IO support |
Date: |
Mon, 12 Mar 2012 15:32:55 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
Il 07/03/2012 19:01, Paolo Bonzini ha scritto:
> 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.
> If any downstream cares about new->old migration, they can apply v1 of
> the patches instead of this.
>
> Paolo Bonzini (3):
> virtio-blk: report non-zero status when failing SG_IO requests
> 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 | 77 ++++++++++++++++++++++++-------------------------
> hw/virtio-blk.h | 14 +++++----
> hw/virtio-pci.c | 11 ++++---
> hw/virtio-pci.h | 4 +-
> hw/virtio.h | 4 +-
> 7 files changed, 64 insertions(+), 60 deletions(-)
>
Ping.
Paolo