[Qemu-devel] [PATCH for-4.0 v4 5/7] colo: check chardev can switch context

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

COLO uses a worker context (iothread) to drive the chardev. All
backends are not able to switch the context, let's report an error in
this case.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 net/colo-compare.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index a39191d522..9156ab3349 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -957,6 +957,12 @@ static int find_and_check_chardev(Chardev **chr,
         return 1;
     }
 
+    if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) {
+        error_setg(errp, "chardev \"%s\" cannot switch context",
+                   chr_name);
+        return 1;
+    }
+
     return 0;
 }
 
-- 
2.20.0.rc1