Hi Tiwei,
I just see I missed to reply to your comment on my commit message:
On 05/03/2018 01:56 PM, Tiwei Bie wrote:
On Mon, Apr 30, 2018 at 05:59:54PM +0200, Maxime Coquelin wrote:
This patch caches all dirty pages logging until the used ring index
is updated. These dirty pages won't be accessed by the guest as
long as the host doesn't give them back to it by updating the
index.
Below sentence in above commit message isn't the reason why
we can cache the dirty page logging. Right?
"""
These dirty pages won't be accessed by the guest as
long as the host doesn't give them back to it by updating the
index.
That's my understanding.
As long as the used index is not updated, the guest will not process
the descs.
If the migration converges between the time the descs are written,
and the time the used index is updated on source side. Then the guest
running on destination will not see the descriptors as used but as
available, and so will be overwritten by the vhost backend on
destination.
Regards,
Maxime
