Re: [PATCH v1 1/1] vfio: Make migration support non experimental by default.

[Cornelia Huck <cohuck@redhat.com>]

On Mon, 8 Mar 2021 21:39:49 +0530
Tarun Gupta <targupta@nvidia.com> wrote:

> VFIO migration support in QEMU is experimental as of now, which was done to
> provide soak time and resolve concerns regarding bit-stream.
> But, with the patches discussed in
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg784931.html , we have
> corrected ordering of saving PCI config space and bit-stream.
> 
> So, this patch proposes to make vfio migration support in QEMU to be enabled
> by default. Tested by successfully migrating mdev device.
> 
> Signed-off-by: Tarun Gupta <targupta@nvidia.com>
> Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
> ---
>  hw/vfio/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
> index f74be78209..15e26f460b 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -3199,7 +3199,7 @@ static Property vfio_pci_dev_properties[] = {
>      DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features,
>                      VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false),
>      DEFINE_PROP_BOOL("x-enable-migration", VFIOPCIDevice,
> -                     vbasedev.enable_migration, false),
> +                     vbasedev.enable_migration, true),
>      DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false),
>      DEFINE_PROP_BOOL("x-balloon-allowed", VFIOPCIDevice,
>                       vbasedev.ram_block_discard_allowed, false),

I think we were still expecting some documentation for this feature,
and I don't recall any update there.

Also, I don't think we have any vendor driver implementation integrated
yet?