RE: [PATCH] vfio-user: reject failover during init

> -----Original Message-----
> From: Hugo Komatsu <[email protected]>
> Sent: 13 August 2026 12:31
> To: John Levon <[email protected]>; Thanos Makatos
> <[email protected]>; Cédric Le Goater <[email protected]>;
> [email protected]
> Cc: Hugo Komatsu <[email protected]>
> Subject: [PATCH] vfio-user: reject failover during init
> 
> Virtio-net failover is a networking feature that relies on a primary
> and standby device pair. This is not currently supported for vfio-user.
> Refuse initialization if this property is set.
> 
> Change-Id: I80989ddb08a1cd3eba84bcf9b0edc26cb4a65669
> Signed-off-by: Hugo Komatsu <[email protected]>
> ---
>  hw/vfio-user/pci.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
> index ecc59a9642..34fa2f22b3 100644
> --- a/hw/vfio-user/pci.c
> +++ b/hw/vfio-user/pci.c
> @@ -251,6 +251,11 @@ static void vfio_user_pci_realize(PCIDevice *pdev,
> Error **errp)
>          return;
>      }
> 
> +    if (pdev->failover_pair_id) {
> +        error_setg(errp, "vfio-user: failover is not supported");
> +        return;
> +    }
> +
>      sock_name = udev->socket->u.q_unix.path;
> 
>      vbasedev->name = g_strdup_printf("vfio-user:%s", sock_name);
> --
> 2.39.3

LGTM except the ChangeId John mentioned.

Reviewed-by: Thanos Makatos <[email protected]>