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

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Message-ID: <BY5PR02MB63714A03B7135F8C4054C1E8BBEC0@BY5PR02MB6371.namprd02.prod.outlook.com>
Date:   Mon, 24 Feb 2020 06:14:11 +0000
From:   Harpreet Singh Anand <hanand@...inx.com>
To:     Jason Wang <jasowang@...hat.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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Subject: RE: [PATCH V4 3/5] vDPA: introduce vDPA bus

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).


Regards,
Harpreet