[PATCH] target/i386: kvm: print info when the kernel doesn't support ioctl(KVM_CAP_GET_MSR_FEATURES)

[Li Qiang]

The ioctl(KVM_CAP_GET_MSR_FEATURES) is quite new. In old platform that
doesn't support this ioctl will sometimes make the user confusion. For
example, when we do nested virtualiztion using host-passthrough model
the VM will has quite different cpu feature with the host.

Signed-off-by: Li Qiang <liq...@163.com>
---
 target/i386/kvm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 0b511906e3..9688f7a167 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -1916,6 +1916,8 @@ static int kvm_get_supported_feature_msrs(KVMState *s)
     }
 
     if (!kvm_check_extension(s, KVM_CAP_GET_MSR_FEATURES)) {
+        info_report("ioctl(KVM_CAP_GET_MSR_FEATURES) is "
+                    "not supported by this kernel.");
         return 0;
     }
 
-- 
2.17.1