KVM: Allow internal errors reported to userspace to carry extra data

Usually userspace will freeze the guest so we can inspect it, but some
internal state is not available.  Add extra data to internal error
reporting so we can expose it to the debugger.  Extra data is specific
to the suberror.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c9cc9596e1a6..c0e66dd58a47 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3352,6 +3352,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
                         kvm_report_emulation_failure(vcpu, "emulation failure");
                         vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                         vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+                        vcpu->run->internal.ndata = 0;
                         ret = 0;
                         goto out;
                 }