kvm tools: Repair running on non ioeventfd-capable platforms
Commit d3923126a24212f1e746a84a575dadbd9f259418 added a bunch of
nice error checking around ioevent__init() but the init may gracefully
fail if ioevents simply aren't supported (PPC64 KVM).
This commit adds a new return code for the init -- positive, but
identifiable as 'not success 0'.
Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/ioeventfd.c b/ioeventfd.c
index 9133101..f2d5a30 100644
--- a/ioeventfd.c
+++ b/ioeventfd.c
@@ -67,7 +67,7 @@
ioeventfd_avail = kvm__supports_extension(kvm, KVM_CAP_IOEVENTFD);
if (!ioeventfd_avail)
- return -ENOSYS;
+ return 1; /* Not fatal, but let caller determine no-go. */
epoll_fd = epoll_create(IOEVENTFD_MAX_EVENTS);
if (epoll_fd < 0)
