Re: Re: [virtio-comment] About adding a new device type virtio-nvme

[äèä <houyingle@sudoinfotech.com>]

On Wed, 18 Jan 2023 09:08:36 -0500, Stefan wrote:

>On Wed, Jan 18, 2023 at 10:15:12AM +0800, äèä wrote:

>> On Tue, 17 Jan 2023 10:34:09 -0500, Stefan wrote:
>> >Can you explain the difficulty of implementing PCIe passthrough live

>> >migration in more detail?

>>

>> VFIO live migration requires IOMMU to support dirty page tracking. Currently,

>> no IOMMU device supports this feature. So, VFIO live migration will take a long time.

>> Detailed information referenceïhttps://www.qemu.org/docs/master/devel/vfio-migration.html

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>Can physical devices can do their own dirty page tracking in the

>meantime since they know which pages are being written to?


That's one solution, and I think it could work in theory, but I'm not aware of any current devices that support this feature.


>I have CCed Alex Williamson regarding VFIO.



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Thanks,
 Leo Hou/Houyingle