linux-kernel - Re: [PATCH RFC 07/12] vdpa_sim: move config management outside of the core

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Date:   Mon, 16 Nov 2020 11:42:01 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: Re: [PATCH RFC 07/12] vdpa_sim: move config management outside of
 the core

On Mon, Nov 16, 2020 at 12:18:19PM +0800, Jason Wang wrote:
>
>On 2020/11/13 下午9:47, Stefano Garzarella wrote:
>>In order to simplify the code of the vdpa_sim core, we move the
>>config management in each device simulator.
>>
>>The device must provide the size of config structure and a callback
>>to update this structure called during the vdpasim_set_features().
>
>
>Similarly, I suggest to do this before patch 2, then there's no need 
>for the conversion of blk device.
>

I'll do.

>
>>
>>Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
>>---
>>  drivers/vdpa/vdpa_sim/vdpa_sim.h     |  5 +++--
>>  drivers/vdpa/vdpa_sim/vdpa_sim.c     | 29 +++++-----------------------
>>  drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 27 ++++++++++++++++----------
>>  drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 12 ++++++++++++
>>  4 files changed, 37 insertions(+), 36 deletions(-)
>>
>>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
>>index 76e642042eb0..f7e1fe0a88d3 100644
>>--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
>>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
>>@@ -10,8 +10,6 @@
>>  #include <linux/vdpa.h>
>>  #include <linux/vhost_iotlb.h>
>>  #include <uapi/linux/virtio_config.h>
>>-#include <uapi/linux/virtio_net.h>
>>-#include <uapi/linux/virtio_blk.h>
>>  #define DRV_VERSION  "0.1"
>>  #define DRV_AUTHOR   "Jason Wang <jasowang@...hat.com>"
>>@@ -42,8 +40,11 @@ struct vdpasim_virtqueue {
>>  struct vdpasim_device {
>>  	u64 supported_features;
>>+	size_t config_size;
>>  	u32 id;
>>  	int nvqs;
>>+
>>+	void (*update_config)(struct vdpasim *vdpasim);
>
>
>Let's use set_config/get_config to align with virtio/vhost.

Yes, it's better,

>
>Other looks good.

Thanks,
Stefano