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

[Jason Wang <jasowang@redhat.com>]

On 2020/2/11 äå7:33, Michael S. Tsirkin wrote:
> On Mon, Feb 10, 2020 at 05:05:17PM +0800, Zha Bin wrote:
> > From: Liu Jiang<gerry@linux.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@linux.alibaba.com>
> > Co-developed-by: Zha Bin<zhabin@linux.alibaba.com>
> > Signed-off-by: Zha Bin<zhabin@linux.alibaba.com>
> > Co-developed-by: Jing Liu<jing2.liu@linux.intel.com>
> > Signed-off-by: Jing Liu<jing2.liu@linux.intel.com>
> > Co-developed-by: Chao Peng<chao.p.peng@linux.intel.com>
> > Signed-off-by: Chao Peng<chao.p.peng@linux.intel.com>
> Hmm. Any way to make this static so we don't need
> base and multiplier?


E.g page per vq?

Thanks