linux-kernel - Re: [PATCH 3/6] vduse: return internal vq group struct as map token

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Message-ID: <CACGkMEvUQeA8bgvMthjSAa4u0o3u7Sq3PDoRXTADa9e=c8G7uw@mail.gmail.com>
Date: Mon, 1 Sep 2025 10:25:54 +0800
From: Jason Wang <jasowang@...hat.com>
To: Eugenio Pérez <eperezma@...hat.com>
Cc: "Michael S . Tsirkin" <mst@...hat.com>, Cindy Lu <lulu@...hat.com>, 
	Stefano Garzarella <sgarzare@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Laurent Vivier <lvivier@...hat.com>, virtualization@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Yongji Xie <xieyongji@...edance.com>, 
	Maxime Coquelin <mcoqueli@...hat.com>
Subject: Re: [PATCH 3/6] vduse: return internal vq group struct as map token

On Tue, Aug 26, 2025 at 7:27 PM Eugenio Pérez <eperezma@...hat.com> wrote:
>
> Return the internal struct that represents the vq group as virtqueue map
> token, instead of the device.  This allows the map functions to access
> the information per group.
>
> At this moment all the virtqueues share the same vq group, that only
> can point to ASID 0.  This change prepares the infrastructure for actual
> per-group address space handling
>
> Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
> ---
> v3:
> * Make the vq groups a dynamic array to support an arbitrary number of
>   them.
> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 52 ++++++++++++++++++++++++------
>  include/linux/virtio.h             |  6 ++--
>  2 files changed, 46 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 0f4e36dd167e..cdb3dc2b5e3f 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -22,6 +22,7 @@
>  #include <linux/uio.h>
>  #include <linux/vdpa.h>
>  #include <linux/nospec.h>
> +#include <linux/virtio.h>
>  #include <linux/vmalloc.h>
>  #include <linux/sched/mm.h>
>  #include <uapi/linux/vduse.h>
> @@ -84,6 +85,10 @@ struct vduse_umem {
>         struct mm_struct *mm;
>  };
>
> +struct vduse_vq_group_int {
> +       struct vduse_dev *dev;
> +};

Nit: I don't get the meaning of the "int" suffix.

Thanks