spice.h: add spice_server_set_seamless_migration

This new call is used in order to identify whether qemu, or
the management (e.g. libvirt), support seamless migration.
If it is supported, qemu spice cmd-line configuration should have
seamless-migration=on.

In addition, we disable seamless migration support if multiple clients
are allowed. Currently, only one client is supported.

1 files changed, 9 insertions, 0 deletions

diff --git a/server/reds.c b/server/reds.c
index 416dff40..6397b41a 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -254,6 +254,7 @@ typedef struct RedsState {
 
     int vm_running;
     Ring char_devs_states; /* list of SpiceCharDeviceStateItem */
+    int seamless_migration_enabled;
 
     SSL_CTX *ctx;
 
@@ -4059,6 +4060,14 @@ SPICE_GNUC_VISIBLE void spice_server_vm_stop(SpiceServer *s)
     red_dispatcher_on_vm_stop();
 }
 
+SPICE_GNUC_VISIBLE void spice_server_set_seamless_migration(SpiceServer *s, int enable)
+{
+    spice_assert(s == reds);
+    /* seamless migration is not supported with multiple clients */
+    reds->seamless_migration_enabled = enable && !reds->allow_multiple_clients;
+    spice_debug("seamless migration enabled=%d", enable);
+}
+
 ssize_t reds_stream_read(RedsStream *s, void *buf, size_t nbyte)
 {
     ssize_t ret;