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vhost+postcopy: Transmit 'listen' to slave

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Notify the vhost-user slave on reception of the 'postcopy-listen'
event from the source.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-03-12 17:21:06 +00:00 • committed by Michael S. Tsirkin
parent f82c11165f
commit 6864a7b5ac
7 changed files with 77 additions and 0 deletions
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11
docs/interop/vhost-user.txt
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@ -709,6 +709,17 @@ Master message types
the slave must open a userfaultfd for later use.
Note that at this stage the migration is still in precopy mode.
* VHOST_USER_POSTCOPY_LISTEN
Id: 29
Master payload: N/A
Master advises slave that a transition to postcopy mode has happened.
The slave must ensure that shared memory is registered with userfaultfd
to cause faulting of non-present pages.
This is always sent sometime after a VHOST_USER_POSTCOPY_ADVISE, and
thus only when VHOST_USER_PROTOCOL_F_PAGEFAULT is supported.
Slave message types
-------------------