linux-kernel - Re: [PATCH RFC 05/12] vdpa_sim: remove the limit of IOTLB entries

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Message-ID: <67e0358e-0ae8-75e9-156f-4156f58387d9@redhat.com>
Date:   Mon, 16 Nov 2020 12:12:21 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        virtualization@...ts.linux-foundation.org
Cc:     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 05/12] vdpa_sim: remove the limit of IOTLB entries


On 2020/11/13 下午9:47, Stefano Garzarella wrote:
> The simulated devices can support multiple queues, so this limit
> should be defined according to the number of queues supported by
> the device.
>
> Since we are in a simulator, let's simply remove that limit.
>
> Suggested-by: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>


Acked-by: Jason Wang <jasowang@...hat.com>

It would be good to introduce a macro instead of using the magic 0 here.

Thanks


> ---
>   drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 2b4fea354413..9c9717441bbe 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -230,7 +230,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_init_attr *attr)
>   		goto err_iommu;
>   	set_dma_ops(dev, &vdpasim_dma_ops);
>   
> -	vdpasim->iommu = vhost_iotlb_alloc(2048, 0);
> +	vdpasim->iommu = vhost_iotlb_alloc(0, 0);
>   	if (!vdpasim->iommu)
>   		goto err_iommu;
>