linux-kernel - Re: [PATCH V4 3/5] vDPA: introduce vDPA bus

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Message-ID: <d6ea5dcb-3933-920b-523e-a494d323ef8a@redhat.com>
Date:   Mon, 24 Feb 2020 14:48:48 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Harpreet Singh Anand <hanand@...inx.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
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        "jgg@...lanox.com" <jgg@...lanox.com>,
        "maxime.coquelin@...hat.com" <maxime.coquelin@...hat.com>,
        "cunming.liang@...el.com" <cunming.liang@...el.com>,
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Subject: Re: [PATCH V4 3/5] vDPA: introduce vDPA bus


On 2020/2/24 下午2:14, Harpreet Singh Anand wrote:
> Is there a plan to add an API in vDPA_config_ops for getting the notification area from the VDPA device (something similar to get_notify_area in the VDPA DPDK case)? This will make the notifications from the guest  (vhost_vdpa use case) to the VDPA device more efficient - at least for virtio 1.0+ drivers in the VM.
>
> I believe this would require enhancement to the vhost ioctl (something similar to the  VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG).


Yes, we plan to add that on top. Basically, here's what we plan to do: 
(sorted by urgency)

1) direct doorbell mapping as you asked here
2) direct interrupt injection (when platform support, e.g through posted 
interrupt)
3) control virtqueue support

Thanks


>
>
> Regards,
> Harpreet
>