[PATCH v4 8/9] target/i386/kvm: Clean up error handling in kvm_arch_init()

[Zhao Liu <zhao1.liu@intel.com>]

Currently, there're following incorrect error handling cases in
kvm_arch_init():
* Missed to handle failure of kvm_get_supported_feature_msrs().
* Missed to return when KVM_CAP_X86_DISABLE_EXITS enabling fails.
* MSR filter related cases called exit() directly instead of returning
  to kvm_init().

Fix the above cases.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
v3: new commit.
---
 target/i386/kvm/kvm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index f68be68eb411..d47476e96813 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -2682,7 +2682,10 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         return ret;
     }
 
-    kvm_get_supported_feature_msrs(s);
+    ret = kvm_get_supported_feature_msrs(s);
+    if (ret < 0) {
+        return ret;
+    }
 
     uname(&utsname);
     lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
@@ -2740,6 +2743,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         if (ret < 0) {
             error_report("kvm: guest stopping CPU not supported: %s",
                          strerror(-ret));
+            return ret;
         }
     }
 
@@ -2785,7 +2789,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         if (ret) {
             error_report("Could not enable user space MSRs: %s",
                          strerror(-ret));
-            exit(1);
+            return ret;
         }
 
         ret = kvm_filter_msr(s, MSR_CORE_THREAD_COUNT,
@@ -2793,7 +2797,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         if (ret) {
             error_report("Could not install MSR_CORE_THREAD_COUNT handler: %s",
                          strerror(-ret));
-            exit(1);
+            return ret;
         }
     }
 
-- 
2.34.1