[Qemu-devel] [PATCH] kvm: fix kvm_check_extension() error handling

[Avi Kivity]

If the KVM_CHECK_EXTENSION ioctl returns an error, it indicates a serious
error, not that the extension is not supported.  Fix kvm_check_extension()
to report the error in this case.

Signed-off-by: Avi Kivity <address@hidden>
---
 kvm-all.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 0ac4b1e..241aaa2 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -326,7 +326,8 @@ int kvm_check_extension(KVMState *s, unsigned int extension)
 
     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
     if (ret < 0) {
-        ret = 0;
+        fprintf(stderr, "KVM_CHECK_EXTENSION failed: %s\n", strerror(-ret));
+        exit(1);
     }
 
     return ret;
-- 
1.6.0.6