linux-kernel - Re: [PATCH v2 1/5] virtio-mmio: add notify feature for per-queue

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Message-ID: <ef613d3a-0372-64f3-7644-2e88cc9d4355@redhat.com>
Date:   Wed, 12 Feb 2020 11:39:54 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Zha Bin <zhabin@...ux.alibaba.com>
Cc:     virtio-dev@...ts.oasis-open.org, slp@...hat.com,
        jing2.liu@...ux.intel.com, linux-kernel@...r.kernel.org,
        qemu-devel@...gnu.org, chao.p.peng@...ux.intel.com,
        gerry@...ux.alibaba.com
Subject: Re: [PATCH v2 1/5] virtio-mmio: add notify feature for per-queue


On 2020/2/11 下午7:33, Michael S. Tsirkin wrote:
> On Mon, Feb 10, 2020 at 05:05:17PM +0800, Zha Bin wrote:
>> From: Liu Jiang<gerry@...ux.alibaba.com>
>>
>> The standard virtio-mmio devices use notification register to signal
>> backend. This will cause vmexits and slow down the performance when we
>> passthrough the virtio-mmio devices to guest virtual machines.
>> We proposed to update virtio over MMIO spec to add the per-queue
>> notify feature VIRTIO_F_MMIO_NOTIFICATION[1]. It can allow the VMM to
>> configure notify location for each queue.
>>
>> [1]https://lkml.org/lkml/2020/1/21/31
>>
>> Signed-off-by: Liu Jiang<gerry@...ux.alibaba.com>
>> Co-developed-by: Zha Bin<zhabin@...ux.alibaba.com>
>> Signed-off-by: Zha Bin<zhabin@...ux.alibaba.com>
>> Co-developed-by: Jing Liu<jing2.liu@...ux.intel.com>
>> Signed-off-by: Jing Liu<jing2.liu@...ux.intel.com>
>> Co-developed-by: Chao Peng<chao.p.peng@...ux.intel.com>
>> Signed-off-by: Chao Peng<chao.p.peng@...ux.intel.com>
> Hmm. Any way to make this static so we don't need
> base and multiplier?


E.g page per vq?

Thanks