[PATCH] kvm tools: Repair running on non ioeventfd-capable platforms

[Matt Evans <matt@ozlabs.org>]

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>
---

Sasha, you screwed PPC64!  And it took me a month to notice.... hahaha!

 tools/kvm/ioeventfd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/kvm/ioeventfd.c b/tools/kvm/ioeventfd.c
index 9133101..f2d5a30 100644
--- a/tools/kvm/ioeventfd.c
+++ b/tools/kvm/ioeventfd.c
@@ -67,7 +67,7 @@ int ioeventfd__init(struct kvm *kvm)
 
 	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)
-- 
1.7.0.4