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vhost-user: Add 'VHOST_USER_POSTCOPY_ADVISE' message

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Wire up a notifier to send a VHOST_USER_POSTCOPY_ADVISE
message on an incoming advise.

Later patches will fill in the behaviour/contents of the
message.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@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 17:21:01 +00:00 • committed by Michael S. Tsirkin
parent 9ccbfe14dd
commit d3dff7a5a1
6 changed files with 79 additions and 0 deletions
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10
docs/interop/vhost-user.txt
View file

@ -699,6 +699,16 @@ Master message types
feature has been successfully negotiated.
It's a required feature for crypto devices.
* VHOST_USER_POSTCOPY_ADVISE
Id: 28
Master payload: N/A
Slave payload: userfault fd
When VHOST_USER_PROTOCOL_F_PAGEFAULT is supported, the
master advises slave that a migration with postcopy enabled is underway,
the slave must open a userfaultfd for later use.
Note that at this stage the migration is still in precopy mode.
Slave message types
-------------------