Print a user-friendly message on failed vmentry

Commit Message

Mohammed Gamal May 19, 2010, 9:16 p.m. UTC

None

Patch

diff --git a/qemu-kvm.c b/qemu-kvm.c
index 35a4c8a..deb4df8 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -106,6 +106,20 @@  static int handle_unhandled(uint64_t reason)
     return -EINVAL;
 }
 
+static int handle_failed_vmentry(uint64_t reason)
+{
+    fprintf(stderr, "kvm: vm entry failed with error 0x%" PRIx64 "\n\n", reason);
+    fprintf(stderr, "If you're runnning a guest on an Intel machine, it can be\n");
+    fprintf(stderr, "most-likely due to the guest going into an invalid state\n");
+    fprintf(stderr, "for Intel VT. For example, the guest maybe running in big\n");
+    fprintf(stderr, "real mode which is not supported by Intel VT.\n\n");
+    fprintf(stderr, "You may want to try enabling real mode emulation in KVM.\n");
+    fprintf(stderr, "To Enable it, you may run the following commands as root:\n");
+    fprintf(stderr, "# rmmod kvm_intel\n");
+    fprintf(stderr, "# rmmod kvm\n");
+    fprintf(stderr, "# modprobe kvm_intel emulate_invalid_guest_state=1\n");
+    return -EINVAL;
+}
 
 static inline void set_gsi(kvm_context_t kvm, unsigned int gsi)
 {
@@ -586,7 +600,7 @@  int kvm_run(CPUState *env)
             r = handle_unhandled(run->hw.hardware_exit_reason);
             break;
         case KVM_EXIT_FAIL_ENTRY:
-            r = handle_unhandled(run->fail_entry.hardware_entry_failure_reason);
+            r = handle_failed_vmentry(run->fail_entry.hardware_entry_failure_reason);
             break;
         case KVM_EXIT_EXCEPTION:
             fprintf(stderr, "exception %d (%x)\n", run->ex.exception,