Re: [Qemu-devel] [PATCH 0/3] vhost-scsi: Support live migration

[Stefan Hajnoczi]

On Thu, Mar 21, 2019 at 09:55:42AM +0200, Nir Weiner wrote:
> Originally migration was not possible with vhost-scsi because
> as part of migration, the source host target SCSI device state
> needs to be saved and loaded into the destination host target SCSI
> device. This cannot be done by QEMU.
> 
> As this can be handled either by external orchestrator or by having
> shared-storage (i.e. iSCSI), there is no reason to limit the
> orchestrator from being able to explictly specify it wish to enable
> migration even when VM have a vhost-scsi device.
> 
> Liran Alon (1):
>   vhost-scsi: Allow user to enable migration
> 
> Nir Weiner (2):
>   vhost-scsi: The vhost device should be stopped when the VM is not
>     running
>   vhost-scsi: Add vmstate descriptor
> 
>  hw/scsi/vhost-scsi.c                  | 57 ++++++++++++++++++++++-----
>  include/hw/virtio/vhost-scsi-common.h |  1 +
>  2 files changed, 48 insertions(+), 10 deletions(-)

What happens when migration is attempted while there is in-flight I/O in
the vring?

Stefan

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