* Marc-André Lureau ([email protected]) wrote:
> On Thu, Mar 8, 2018 at 8:58 PM, Dr. David Alan Gilbert (git)
> <[email protected]> wrote:
> > From: "Dr. David Alan Gilbert" <[email protected]>
> >
> > This message is sent just before the end of postcopy to get the
> > client to stop using userfault since we wont respond to any more
> > requests. It should close userfaultfd so that any other pages
> > get mapped to the backing file automatically by the kernel, since
> > at this point we know we've received everything.
> >
> > Signed-off-by: Dr. David Alan Gilbert <[email protected]>
> > Reviewed-by: Peter Xu <[email protected]>
>
> Reviewed-by: Marc-André Lureau <[email protected]>
Thanks.
>
> > ---
> > contrib/libvhost-user/libvhost-user.c | 23 +++++++++++++++++++++++
> > contrib/libvhost-user/libvhost-user.h | 1 +
> > docs/interop/vhost-user.txt | 11 +++++++++++
> > hw/virtio/vhost-user.c | 1 +
> > 4 files changed, 36 insertions(+)
> >
> > diff --git a/contrib/libvhost-user/libvhost-user.c
> > b/contrib/libvhost-user/libvhost-user.c
> > index 1b224af706..1f988ab787 100644
> > --- a/contrib/libvhost-user/libvhost-user.c
> > +++ b/contrib/libvhost-user/libvhost-user.c
> > @@ -99,6 +99,7 @@ vu_request_to_string(unsigned int req)
> > REQ(VHOST_USER_SET_CONFIG),
> > REQ(VHOST_USER_POSTCOPY_ADVISE),
> > REQ(VHOST_USER_POSTCOPY_LISTEN),
> > + REQ(VHOST_USER_POSTCOPY_END),
> > REQ(VHOST_USER_MAX),
> > };
> > #undef REQ
> > @@ -1095,6 +1096,26 @@ vu_set_postcopy_listen(VuDev *dev, VhostUserMsg
> > *vmsg)
> > vmsg->payload.u64 = 0; /* Success */
> > return true;
> > }
> > +
> > +static bool
> > +vu_set_postcopy_end(VuDev *dev, VhostUserMsg *vmsg)
> > +{
> > + DPRINT("%s: Entry\n", __func__);
> > + dev->postcopy_listening = false;
> > + if (dev->postcopy_ufd > 0) {
> > + close(dev->postcopy_ufd);
> > + dev->postcopy_ufd = -1;
> > + DPRINT("%s: Done close\n", __func__);
> > + }
> > +
> > + vmsg->fd_num = 0;
> > + vmsg->payload.u64 = 0;
> > + vmsg->size = sizeof(vmsg->payload.u64);
> > + vmsg->flags = VHOST_USER_VERSION | VHOST_USER_REPLY_MASK;
> > + DPRINT("%s: exit\n", __func__);
> > + return true;
> > +}
> > +
> > static bool
> > vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
> > {
> > @@ -1170,6 +1191,8 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
> > return vu_set_postcopy_advise(dev, vmsg);
> > case VHOST_USER_POSTCOPY_LISTEN:
> > return vu_set_postcopy_listen(dev, vmsg);
> > + case VHOST_USER_POSTCOPY_END:
> > + return vu_set_postcopy_end(dev, vmsg);
> > default:
> > vmsg_close_fds(vmsg);
> > vu_panic(dev, "Unhandled request: %d", vmsg->request);
> > diff --git a/contrib/libvhost-user/libvhost-user.h
> > b/contrib/libvhost-user/libvhost-user.h
> > index ed505cf0c1..79f7a53ee8 100644
> > --- a/contrib/libvhost-user/libvhost-user.h
> > +++ b/contrib/libvhost-user/libvhost-user.h
> > @@ -87,6 +87,7 @@ typedef enum VhostUserRequest {
> > VHOST_USER_CLOSE_CRYPTO_SESSION = 27,
> > VHOST_USER_POSTCOPY_ADVISE = 28,
> > VHOST_USER_POSTCOPY_LISTEN = 29,
> > + VHOST_USER_POSTCOPY_END = 30,
> > VHOST_USER_MAX
> > } VhostUserRequest;
> >
> > diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt
> > index cc049196c9..5a31e4234e 100644
> > --- a/docs/interop/vhost-user.txt
> > +++ b/docs/interop/vhost-user.txt
> > @@ -729,6 +729,17 @@ Master message types
> > This is always sent sometime after a VHOST_USER_POSTCOPY_ADVISE, and
> > thus only when VHOST_USER_PROTOCOL_F_PAGEFAULT is supported.
> >
> > + * VHOST_USER_POSTCOPY_END
> > + Id: 30
> > + Slave payload: u64
> > +
> > + Master advises that postcopy migration has now completed. The
> > + slave must disable the userfaultfd. The response is an
> > acknowledgement
> > + only.
>
> I guess 0 for success, non-zero otherwise - please update the spec.
Thanks, comment added. Actually it's a place holder for it, we only
send 0 currently.
Dave
>
> > + When VHOST_USER_PROTOCOL_F_PAGEFAULT is supported, this message
> > + is sent at the end of the migration, after VHOST_USER_POSTCOPY_LISTEN
> > + was previously sent
> > +
> > Slave message types
> > -------------------
> >
> > diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> > index b304bc475e..45de6d8a53 100644
> > --- a/hw/virtio/vhost-user.c
> > +++ b/hw/virtio/vhost-user.c
> > @@ -82,6 +82,7 @@ typedef enum VhostUserRequest {
> > VHOST_USER_CLOSE_CRYPTO_SESSION = 27,
> > VHOST_USER_POSTCOPY_ADVISE = 28,
> > VHOST_USER_POSTCOPY_LISTEN = 29,
> > + VHOST_USER_POSTCOPY_END = 30,
> > VHOST_USER_MAX
> > } VhostUserRequest;
> >
> > --
> > 2.14.3
> >
> >
>
>
>
> --
> Marc-André Lureau
--
Dr. David Alan Gilbert / [email protected] / Manchester, UK
