On Fri, Oct 13, 2023 at 06:28:34PM +0800, Zhu, Lingshan wrote: > > > On 10/12/2023 9:27 PM, Jason Gunthorpe wrote: > > On Thu, Oct 12, 2023 at 06:29:47PM +0800, Zhu, Lingshan wrote: > > > sorry for the late reply, we have discussed this for weeks in virtio mailing > list. I have proposed a live migration solution which is a config space solution. > > I'm sorry that can't be a serious proposal - config space can't do > DMA, it is not suitable. > > config space only controls the live migration process and config the related > facilities. > We don't use config space to transfer data. > > The new added registers work like queue_enable or features. > > For example, we use DMA to report dirty pages and MMIO to fetch the dirty data. > > I remember in another thread you said:"you can't use DMA for any migration > flows" > > And I agree to that statement, so we use config space registers to control the > flow. > > Thanks, > Zhu Lingshan > > > Jason > If you are using dma then I don't see what's wrong with admin vq. dma is all it does.
