netdev - Re: [PATCH vhost v6 07/10] virtio: find_vqs: add new parameter premapped

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Message-ID: <CACGkMEszXC=B3U05OsbMwEFcvSvU7AwPEKasmQa=VgjCz+k2ww@mail.gmail.com>
Date: Thu, 28 Mar 2024 15:56:26 +0800
From: Jason Wang <jasowang@...hat.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: virtualization@...ts.linux.dev, "Michael S. Tsirkin" <mst@...hat.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH vhost v6 07/10] virtio: find_vqs: add new parameter premapped

On Wed, Mar 27, 2024 at 7:14 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> If the premapped mode is enabled, the dma array(struct vring_desc_dma) of
> virtio core will not be allocated. That is judged when find_vqs() is
> called. To avoid allocating dma array in find_vqs() and releasing it
> immediately by virtqueue_set_dma_premapped(). This patch introduces a
> new parameter to find_vqs(). Then we can judge should we allocate the
> dma array(struct vring_desc_dma) or not inside find_vqs().
>
> The driver must check the premapped mode of every vq after find_vqs().
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>

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

Thanks