linux-kernel - Re: [PATCH RFC 06/12] vdpa_sim: add struct vdpasim

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Message-ID: <20201117112305.GE131917@stefanha-x1.localdomain>
Date:   Tue, 17 Nov 2020 11:23:05 +0000
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Laurent Vivier <lvivier@...hat.com>,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: Re: [PATCH RFC 06/12] vdpa_sim: add struct vdpasim_device to store
 device properties

On Fri, Nov 13, 2020 at 02:47:06PM +0100, Stefano Garzarella wrote:
> Move device properties used during the entire life cycle in a new
> structure to simplify the copy of these fields during the vdpasim
> initialization.
> 
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
>  drivers/vdpa/vdpa_sim/vdpa_sim.h     | 17 ++++++++------
>  drivers/vdpa/vdpa_sim/vdpa_sim.c     | 33 ++++++++++++++--------------
>  drivers/vdpa/vdpa_sim/vdpa_sim_blk.c |  8 +++++--
>  drivers/vdpa/vdpa_sim/vdpa_sim_net.c |  9 +++++---
>  4 files changed, 38 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> index 6a1267c40d5e..76e642042eb0 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> @@ -40,12 +40,17 @@ struct vdpasim_virtqueue {
>  	irqreturn_t (*cb)(void *data);
>  };
>  
> +struct vdpasim_device {
> +	u64 supported_features;
> +	u32 id;
> +	int nvqs;
> +};
> +
>  struct vdpasim_init_attr {
> -	u32		device_id;
> -	u64		features;
> +	struct vdpasim_device device;

It's unclear to me what the exact purpose of struct vdpasim_device is.
At least the name reminds me of struct device, which this is not.

Should this be called just struct vdpasim_attr or struct
vdpasim_dev_attr? In other words, the attributes that are needed even
after intialization?

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