KVM: Communicate cr8 changes to userspace

This allows running 64-bit Windows.

Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index a9b4cb51dec8..cd999c0a24c4 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1831,7 +1831,8 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                         vcpu_load_rsp_rip(vcpu);
                         set_cr8(vcpu, vcpu->regs[reg]);
                         skip_emulated_instruction(vcpu);
-                        return 1;
+                        kvm_run->exit_reason = KVM_EXIT_SET_TPR;
+                        return 0;
                 };
                 break;
         case 2: /* clts */
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 91a446f450b8..1d5a49cdda3b 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -46,6 +46,7 @@ enum kvm_exit_reason {
         KVM_EXIT_SHUTDOWN         = 8,
         KVM_EXIT_FAIL_ENTRY       = 9,
         KVM_EXIT_INTR             = 10,
+        KVM_EXIT_SET_TPR          = 11
 };
 
 /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */