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
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