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Subject: Re: [virtio-dev] Dirty Page Tracking (DPT)

Does this mean that SW takes over the datapath during LM?
If so, is there any infrastructureÂto "gracefully" do a hand-off from HW mode (pci device is managing the rings) to SW mode, in that when switching from HW->SW, HW is stalled & quiesced, then the SW takes from where HW leftÂoff?

Rob Miller

On Tue, Apr 7, 2020 at 5:53 AM Eugenio Perez Martin <eperezma@redhat.com> wrote:

So, from the previous mails, it seems that monitoring the used ring
(and the packed descriptors) is a good first step in that direction,
as DPDK did. This way, the device does not need to worry about the
dirty page tracking using a bitmap and the PCI writes limitation, and
we can evaluate later the proposed alternatives:
* Alternate used descriptors in packed.
* vDPA interface for vDPA devices in a convenient format.

Any thoughts? Do you think that we should start with another way?


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