Re: [PATCH v3 0/4] vdpa: Add resume operation

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Oct 17, 2022 at 02:06:19PM +0200, sebastien.boeuf@intel.com wrote:
> From: Sebastien Boeuf <sebastien.boeuf@intel.com>
> 
> This series introduces a new operation for vdpa devices. It allows them
> to be resumed after they have been suspended. A new feature bit is
> introduced for devices to advertise their ability to be resumed after
> they have been suspended. This feature bit is different from the one
> advertising the ability to be suspended, meaning a device that can be
> suspended might not have the ability to be resumed.
> 
> Even if it is already possible to restore a device that has been
> suspended, which is very convenient for live migrating virtual machines,
> there is a major drawback as the device must be fully reset. There is no
> way to resume a device that has been suspended without having to
> configure the device again and without having to recreate the IOMMU
> mappings. This new operation aims at filling this gap by allowing the
> device to resume processing the virtqueue descriptors without having to
> reset it. This is particularly useful for performing virtual machine
> offline migration, also called snapshot/restore, as it allows a virtual
> machine to resume to a running state after it was paused and a snapshot
> of the entire system was taken.
> 
> Sebastien Boeuf (4):
>   vdpa: Add resume operation
>   vhost-vdpa: Introduce RESUME backend feature bit
>   vhost-vdpa: uAPI to resume the device
>   vdpa_sim: Implement resume vdpa op
> 
>  drivers/vdpa/vdpa_sim/vdpa_sim.c | 19 ++++++++++++++++++
>  drivers/vhost/vdpa.c             | 34 +++++++++++++++++++++++++++++++-
>  include/linux/vdpa.h             |  6 +++++-
>  include/uapi/linux/vhost.h       |  8 ++++++++
>  include/uapi/linux/vhost_types.h |  2 ++
>  5 files changed, 67 insertions(+), 2 deletions(-)


Not on list:

$ b4 mbox cover.1666008238.git.sebastien.boeuf@intel.com
Looking up https://lore.kernel.org/r/cover.1666008238.git.sebastien.boeuf%40intel.com
That message-id is not known.
$ 


dropped for now.

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