KVM: Return to userspace on emulation failure

Instead of mindlessly retrying to execute the instruction, report the
failure to userspace.

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 5037e170a70d..671051829da6 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -95,6 +95,10 @@ struct kvm_pit_config {
 #define KVM_EXIT_S390_RESET       14
 #define KVM_EXIT_DCR              15
 #define KVM_EXIT_NMI              16
+#define KVM_EXIT_INTERNAL_ERROR   17
+
+/* For KVM_EXIT_INTERNAL_ERROR */
+#define KVM_INTERNAL_ERROR_EMULATION 1
 
 /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */
 struct kvm_run {
@@ -181,6 +185,9 @@ struct kvm_run {
                         __u32 data;
                         __u8  is_write;
                 } dcr;
+                struct {
+                        __u32 suberror;
+                } internal;
                 /* Fix the size of the union. */
                 char padding[256];
         };